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Ogilvie LM, Coyle-Asbil B, Brunt KR, Petrik J, Simpson JA. Therapy-naïve malignancy causes cardiovascular disease: A state-of-the-art cardio-oncology perspective. Am J Physiol Heart Circ Physiol 2024. [PMID: 38639740 DOI: 10.1152/ajpheart.00795.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 04/15/2024] [Indexed: 04/20/2024]
Abstract
Cardiovascular disease (CVD) and cancer are the leading causes of mortality worldwide. Although generally thought of as distinct diseases, the intersectional overlap between CVD and cancer is increasingly evident in both causal and mechanistic relationships. The field of cardio-oncology is largely focused on cardiotoxic effects of cancer therapies (e.g., chemotherapy, radiation). Further, the cumulative effects of cardiotoxic therapy exposure and the prevalence of CVD risk factors in cancer patients leads to long-term morbidity and poor quality of life in this patient population-even when patients are cancer-free. Evidence from cancer patients and animal models demonstrates that the presence of malignancy itself, independent of cardiotoxic therapy exposure or CVD risk factors, negatively impacts cardiac structure and function. As such, the primary focus of this review is the cardiac pathophysiologic and molecular features of therapy-naïve cancer. We also summarize the strengths and limitations of preclinical cancer models for cardio-oncology research and discuss therapeutic strategies that have been tested experimentally for the treatment of cancer-induced cardiac atrophy and dysfunction. Finally, we explore an adjacent area of interest, called 'reverse cardio-oncology', where the sequelae of heart failure augment cancer progression. Here, we emphasize the cross-disease communication between malignancy and the injured heart, and discuss the importance of chronic low-grade inflammation and endocrine factors in the progression of both diseases.
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Affiliation(s)
- Leslie M Ogilvie
- Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Bridget Coyle-Asbil
- Department of Human Health & Nutritional Sciences, University of Guelph; IMPART investigator team Canada, Guelph, Ontario, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie University, Saint John, NB, Canada
| | - Jim Petrik
- Department of Biomedical Sciences, University of Guelph, Canada
| | - Jeremy A Simpson
- Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
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2
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Delfinis LJ, Ogilvie LM, Khajehzadehshoushtar S, Gandhi S, Garibotti MC, Thuhan AK, Matuszewska K, Pereira M, Jones RG, Cheng AJ, Hawke TJ, Greene NP, Murach KA, Simpson JA, Petrik J, Perry CGR. Muscle weakness and mitochondrial stress occur before metastasis in a novel mouse model of ovarian cancer cachexia. bioRxiv 2024:2024.04.08.588639. [PMID: 38645227 PMCID: PMC11030380 DOI: 10.1101/2024.04.08.588639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/23/2024]
Abstract
Objectives A high proportion of women with advanced epithelial ovarian cancer (EOC) experience weakness and cachexia. This relationship is associated with increased morbidity and mortality. EOC is the most lethal gynecological cancer, yet no preclinical cachexia model has demonstrated the combined hallmark features of metastasis, ascites development, muscle loss and weakness in adult immunocompetent mice. Methods Here, we evaluated a new model of ovarian cancer-induced cachexia with the advantages of inducing cancer in adult immunocompetent C57BL/6J mice through orthotopic injections of EOC cells in the ovarian bursa. We characterized the development of metastasis, ascites, muscle atrophy, muscle weakness, markers of inflammation, and mitochondrial stress in the tibialis anterior (TA) and diaphragm ∼45, ∼75 and ∼90 days after EOC injection. Results Primary ovarian tumour sizes were progressively larger at each time point while robust metastasis, ascites development, and reductions in body, fat and muscle weights occurred by 90 Days. There were no changes in certain inflammatory (TNFα), atrogene (MURF1 and Atrogin) or GDF15 markers within both muscles whereas IL-6 was increased at 45 and 90 Day groups in the diaphragm. TA weakness in 45 Day preceded atrophy and metastasis that were observed later (75 and 90 Day, respectively). The diaphragm demonstrated both weakness and atrophy in 45 Day. In both muscles, this pre-metastatic muscle weakness corresponded with considerable reprogramming of gene pathways related to mitochondrial bioenergetics as well as reduced functional measures of mitochondrial pyruvate oxidation and creatine-dependent ADP/ATP cycling as well as increased reactive oxygen species emission (hydrogen peroxide). Remarkably, muscle force per unit mass at 90 days was partially restored in the TA despite the presence of atrophy and metastasis. In contrast, the diaphragm demonstrated progressive weakness. At this advanced stage, mitochondrial pyruvate oxidation in both muscles exceeded control mice suggesting an apparent metabolic super-compensation corresponding with restored indices of creatine-dependent adenylate cycling. Conclusion This mouse model demonstrates the concurrent development of cachexia and metastasis that occurs in women with EOC. The model provides physiologically relevant advantages of inducing tumour development within the ovarian bursa in immunocompetent adult mice. Moreover, the model reveals that muscle weakness in both TA and diaphragm precedes metastasis while weakness also precedes atrophy in the TA. An underlying mitochondrial bioenergetic stress corresponded with this early weakness. Collectively, these discoveries can direct new research towards the development of therapies that target pre-atrophy and pre-metastatic weakness during EOC in addition to therapies targeting cachexia. Highlights This study reports the first orthotopic model of metastatic ovarian cancer cachexia that can be induced in adult immunocompetent miceDiaphragm and limb muscle weakness precedes metastasis and atrophy during ovarian cancerSkeletal muscle mitochondrial oxidative and redox stress signatures occur during pre-metastatic stages of ovarian cancerSpecific muscle force as well as mitochondrial pyruvate oxidation and creatine metabolism demonstrate compensation in later stagesOvarian cancer has heterogeneous effects on distinct muscle types across time.
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Northrup V, Perez LJ, Edgett BA, Karakach T, Simpson JA, Brunt KR. Intron retention is a mechanism of erythropoietin regulation in brain cell models. Gene 2024; 898:148099. [PMID: 38128788 DOI: 10.1016/j.gene.2023.148099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 12/01/2023] [Accepted: 12/18/2023] [Indexed: 12/23/2023]
Abstract
Intron retention is a mechanism of post-transcriptional gene regulation, including genes involved in erythropoiesis. Erythropoietin (EPO) is a hormone without evidence of intracellular vesicle storage that regulates erythropoiesis. We hypothesize that EPO uses intron retention as a mechanism of post-transcriptional regulation in response to hypoxia and ischemia. Cell models of hypoxia and ischemia for kidney, liver, and brain cells were examined for intron retention by real time quantitative PCR. EPO expression increased in most cells except for blood brain barrier and liver cells. The intron retained transcript ratio decreased in brain cells, except for Astrocytes, but showed no change in kidney or liver after 24 h of ischemia. The shift in intron ratio was maintained when using poly (A) enriched cDNA, suggesting that intron retention is not due to immature transcripts. The expression of EPO was elevated at variable time points amongst cell models with the intron ratio also changing over a time course of 2 to 16 h after ischemia. We conclude that intron retention is a mechanism regulating EPO expression in response to ischemia in a tissue specific manner.
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Affiliation(s)
- Victoria Northrup
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada; Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada; IMPART investigator team Canada
| | - Lester J Perez
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada; Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada; IMPART investigator team Canada
| | - Brittany A Edgett
- Department of Kinesiology, University of Calgary, Calgary, Alberta, Canada; IMPART investigator team Canada
| | - Tobias Karakach
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada; IMPART investigator team Canada
| | - Jeremy A Simpson
- Department of Human and Nutritional Science, University of Guelph, Guelph, Ontario, Canada; IMPART investigator team Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada; Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada; IMPART investigator team Canada.
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4
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Allwood MA, Edgett BA, Platt MJ, Marrow JP, Coyle-Asbil B, Holjak EJB, Nelson VL, Bangali S, Alshamali R, Jacyniak K, Klein JM, Farquharson L, Romanova N, Northrup V, Ogilvie LM, Ayoub A, Ask K, Vickaryous MK, Hare GMT, Brunt KR, Simpson JA. Novel roles of cardiac-derived erythropoietin in cardiac development and function. J Mol Cell Cardiol 2024; 188:90-104. [PMID: 38382296 DOI: 10.1016/j.yjmcc.2024.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 01/15/2024] [Accepted: 01/22/2024] [Indexed: 02/23/2024]
Abstract
The role of erythropoietin (EPO) has extended beyond hematopoiesis to include cytoprotection, inotropy, and neurogenesis. Extra-renal EPO has been reported for multiple tissue/cell types, but the physiological relevance remains unknown. Although the EPO receptor is expressed by multiple cardiac cell types and human recombinant EPO increases contractility and confers cytoprotection against injury, whether the heart produces physiologically meaningful amounts of EPO in vivo is unclear. We show a distinct circadian rhythm of cardiac EPO mRNA expression in adult mice and increased mRNA expression during embryogenesis, suggesting physiological relevance to cardiac EPO production throughout life. We then generated constitutive, cardiomyocyte-specific EPO knockout mice driven by the Mlc2v promoter (EPOfl/fl:Mlc2v-cre+/-; EPOΔ/Δ-CM). During cardiogenesis, cardiac EPO mRNA expression and cellular proliferation were reduced in EPOΔ/Δ-CM hearts. However, in adult EPOΔ/Δ- CM mice, total heart weight was preserved through increased cardiomyocyte cross-sectional area, indicating the reduced cellular proliferation was compensated for by cellular hypertrophy. Echocardiography revealed no changes in cardiac dimensions, with modest reductions in ejection fraction, stroke volume, and tachycardia, whereas invasive hemodynamics showed increased cardiac contractility and lusitropy. Paradoxically, EPO mRNA expression in the heart was elevated in adult EPOΔ/Δ-CM, along with increased serum EPO protein content and hematocrit. Using RNA fluorescent in situ hybridization, we found that Epo RNA colocalized with endothelial cells in the hearts of adult EPOΔ/Δ-CM mice, identifying the endothelial cells as a cell responsible for the EPO hyper-expression. Collectively, these data identify the first physiological roles for cardiomyocyte-derived EPO. We have established cardiac EPO mRNA expression is a complex interplay of multiple cell types, where loss of embryonic cardiomyocyte EPO production results in hyper-expression from other cells within the adult heart.
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Affiliation(s)
- Melissa A Allwood
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada; IMPART investigator Team, Canada
| | - Brittany A Edgett
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada; Department of Pharmacology, Dalhousie Medicine New Brunswick, 100 Tucker Park Road, Saint John, New Brunswick E2L 4L5, Canada; IMPART investigator Team, Canada; Department of Kinesiology, University of Calgary, Calgary, Alberta, Canada
| | - Mathew J Platt
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada; IMPART investigator Team, Canada
| | - Jade P Marrow
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada; IMPART investigator Team, Canada
| | - Bridget Coyle-Asbil
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada; IMPART investigator Team, Canada
| | - Emma J B Holjak
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada; IMPART investigator Team, Canada
| | - Victoria L Nelson
- Department of Pharmacology, Dalhousie Medicine New Brunswick, 100 Tucker Park Road, Saint John, New Brunswick E2L 4L5, Canada; IMPART investigator Team, Canada
| | - Swara Bangali
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada
| | - Razan Alshamali
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada; IMPART investigator Team, Canada
| | - Kathy Jacyniak
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada
| | - Jorden M Klein
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada
| | - Laura Farquharson
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada
| | - Nadya Romanova
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada
| | - Victoria Northrup
- Department of Pharmacology, Dalhousie Medicine New Brunswick, 100 Tucker Park Road, Saint John, New Brunswick E2L 4L5, Canada; IMPART investigator Team, Canada
| | - Leslie M Ogilvie
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada; IMPART investigator Team, Canada
| | - Anmar Ayoub
- Firestone Institute for Respiratory Health, McMaster University, Hamilton, Ontario, Canada
| | - Kjetil Ask
- Firestone Institute for Respiratory Health, McMaster University, Hamilton, Ontario, Canada
| | - Matthew K Vickaryous
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada
| | - Gregory M T Hare
- Departments of Anesthesia & Physiology, St. Michel's Hospital, University of Toronto, Toronto, Ontario, Canada; IMPART investigator Team, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie Medicine New Brunswick, 100 Tucker Park Road, Saint John, New Brunswick E2L 4L5, Canada; IMPART investigator Team, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada; IMPART investigator Team, Canada.
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Chin K, Jiang H, Steinberg BE, Goldenberg NM, Desjardins JF, Kabir G, Liu E, Vanama R, Baker AJ, Deschamps A, Simpson JA, Maynes JT, Vinogradov SA, Connelly KA, Mazer CD, Hare GMT. Bilateral Nephrectomy Impairs Cardiovascular Function and Cerebral Perfusion in a Rat Model of Acute Hemodilutional Anemia. J Appl Physiol (1985) 2024. [PMID: 38385183 DOI: 10.1152/japplphysiol.00858.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 02/15/2024] [Indexed: 02/23/2024] Open
Abstract
Anemia and renal failure are independent risk factors for perioperative stroke, prompting us to assess the combined impact of acute hemodilutional anemia and bilateral nephrectomy (2Nx) on microvascular brain pO2 (PBrO2) in a rat model. Changes in PBrO2 (phosphorescence quenching) and cardiac output (CO, echocardiography) were measured in 2 different groups of anesthetized Sprague-Dawley rats (1.5% isoflurane, n = 5-8 per group) randomized to Sham 2Nx or 2Nx and subsequently exposed to acute hemodilutional anemia (50% estimated blood volume exchange with 6% hydroxyethyl starch) or time based controls (no hemodilution). Outcomes were assessed by ANOVA with significance assigned at p<0.05. At baseline, 2Nx rats demonstrated reduced CO (49.9±9.4 vs. 66.3±19.3 mL/min) and PBrO2 (21.1±2.9 vs. 32.4±3.1 mmHg)relative to Sham 2Nx rats (p<0.05 for both). Following hemodilution 2Nx rats demonstrated a further decrease in PBrO2 (15.0±6.3 mmHg, p<0.05). Hemodiluted 2Nx rats did not demonstrate a comparable increase in CO (74.8±22.4 vs 108.9±18.8 mL/min, p<0.001) after hemodilution which likely contributed to the observed reduction in PBrO2. This impaired CO response was associated with reduced fractional shortening (33±9 vs. 51±5 %) and increased left ventricular end systolic volume (156±51 vs 72±15 µL, p<0.001) suggestive of systolic dysfunction. By contrast, hemodiluted Sham 2Nx animals demonstrated a robust increase in CO and preserved PBrO2. These data support the hypothesis that the kidney plays a central role in maintaining cerebral perfusion and in initiating the adaptive increase in CO required to optimize PBrO2 during acute anemia.
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Affiliation(s)
- Kyle Chin
- Anesthesiology and Pain Medicine, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Helen Jiang
- Anesthesiology and Pain Medicine, St. Michael's Hospital, Toronto, ON, Canada
| | | | - Neil M Goldenberg
- Department of Anesthesia and Pain Medicine, University of Toronto, Toronto, Ontario, Canada
| | | | - Golam Kabir
- Division of Cardiology, Department of Medicine, University of Toronto, Toronto, ON, Canada
| | - Elaine Liu
- Anesthesiology and Pain Medicine, St. Michael's Hospital, Toronto, ON, Canada
| | - Ramesh Vanama
- Department of Anesthesia and Pain Medicine, Hospital for Sick Children, Toronto, ON, Canada
| | - Andrew J Baker
- Anesthesiology and Pain Medicine, St. Michael's Hospital, Toronto, ON, Canada
| | - Alain Deschamps
- Institut de Cardiologie de Montreal, Université de Montréal, Montreal, QC, Canada
| | - Jeremy A Simpson
- Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Jason T Maynes
- Anesthesia and Pain Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Sergei A Vinogradov
- Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA, United States
| | - Kim A Connelly
- Department of Medicine, University of Toronto, Toronto, ON, Canada
| | - C David Mazer
- Anesthesiology and Pain Medicine, St. Michael's Hospital, Toronto, ON, Canada
| | - Gregory M T Hare
- Anesthesiology and Pain Medicine, University of Toronto, Toronto, Ontario, Canada
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6
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Walker CR, Hickson RI, Chang E, Ngor P, Sovannaroth S, Simpson JA, Price DJ, McCaw JM, Price RN, Flegg JA, Devine A. A model for malaria treatment evaluation in the presence of multiple species. Epidemics 2023; 44:100687. [PMID: 37348379 PMCID: PMC7614843 DOI: 10.1016/j.epidem.2023.100687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 03/12/2023] [Accepted: 05/12/2023] [Indexed: 06/24/2023] Open
Abstract
Plasmodium falciparum and P. vivax are the two most common causes of malaria. While the majority of deaths and severe morbidity are due to P. falciparum, P. vivax poses a greater challenge to eliminating malaria outside of Africa due to its ability to form latent liver stage parasites (hypnozoites), which can cause relapsing episodes within an individual patient. In areas where P. falciparum and P. vivax are co-endemic, individuals can carry parasites of both species simultaneously. These mixed infections complicate dynamics in several ways: treatment of mixed infections will simultaneously affect both species, P. falciparum can mask the detection of P. vivax, and it has been hypothesised that clearing P. falciparum may trigger a relapse of dormant P. vivax. When mixed infections are treated for only blood-stage parasites, patients are at risk of relapse infections due to P. vivax hypnozoites. We present a stochastic mathematical model that captures interactions between P. falciparum and P. vivax, and incorporates both standard schizonticidal treatment (which targets blood-stage parasites) and radical cure treatment (which additionally targets liver-stage parasites). We apply this model via a hypothetical simulation study to assess the implications of different treatment coverages of radical cure for mixed and P. vivax infections and a "unified radical cure" treatment strategy where P. falciparum, P. vivax, and mixed infections all receive radical cure after screening glucose-6-phosphate dehydrogenase (G6PD) normal. In addition, we investigated the impact of mass drug administration (MDA) of blood-stage treatment. We find that a unified radical cure strategy leads to a substantially lower incidence of malaria cases and deaths overall. MDA with schizonticidal treatment was found to decrease P. falciparum with little effect on P. vivax. We perform a univariate sensitivity analysis to highlight important model parameters.
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Affiliation(s)
- C R Walker
- School of Mathematics and Statistics, University of Melbourne, Australia.
| | - R I Hickson
- School of Mathematics and Statistics, University of Melbourne, Australia; Australian Institute of Tropical Health and Medicine, and College of Public Health, Medical & Veterinary Sciences, James Cook University, Australia; Health and Biosecurity, CSIRO, Australia
| | - E Chang
- School of Mathematics and Statistics, University of Melbourne, Australia
| | - P Ngor
- Cambodian National Center for Parasitology, Entomology and Malaria Control, Cambodia; Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Thailand
| | - S Sovannaroth
- Cambodian National Center for Parasitology, Entomology and Malaria Control, Cambodia
| | - J A Simpson
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Australia
| | - D J Price
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Australia; Department of Infectious Diseases, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Australia
| | - J M McCaw
- School of Mathematics and Statistics, University of Melbourne, Australia; Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Australia
| | - R N Price
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Thailand; Division of Global and Tropical Health, Menzies School of Health Research and Charles Darwin University, Australia; Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, UK
| | - J A Flegg
- School of Mathematics and Statistics, University of Melbourne, Australia
| | - A Devine
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Australia; Division of Global and Tropical Health, Menzies School of Health Research and Charles Darwin University, Australia
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7
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Petrick HL, Ogilvie LM, Brunetta HS, Robinson A, Kirsh AJ, Barbeau PA, Handy RM, Coyle-Asbil B, Gianetto-Hill C, Dennis KMJH, van Loon LJC, Chabowski A, Schertzer JD, Allen-Vercoe E, Simpson JA, Holloway GP. Dietary nitrate and corresponding gut microbiota prevent cardiac dysfunction in obese mice. Diabetes 2023:148499. [PMID: 36812497 DOI: 10.2337/db22-0575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 02/12/2023] [Indexed: 02/24/2023]
Abstract
Impaired heart function can develop in diabetic individuals in the absence of coronary artery disease or hypertension, suggesting mechanisms beyond hypertension/increased afterload contribute to diabetic cardiomyopathy. Identifying therapeutic approaches that improve glycemia and prevent cardiovascular disease are clearly required for clinical management of diabetes-related comorbidities. Since intestinal bacteria are important for metabolism of nitrate, we examined if dietary nitrate and fecal microbial transplantation (FMT) from nitrate-fed mice could prevent high-fat diet (HFD)-induced cardiac abnormalities. Male C57Bl/6N mice were fed an 8-week low-fat diet (LFD), HFD, or HFD+Nitrate (4mM sodium nitrate). HFD-fed mice presented with pathological left ventricular (LV) hypertrophy, reduced stroke volume and increased end diastolic pressure, in association with increased myocardial fibrosis, glucose intolerance, adipose inflammation, serum lipids, LV mitochondrial reactive oxygen species (ROS), and gut dysbiosis. In contrast, dietary nitrate attenuated these detriments. In HFD-fed mice, FMT from HFD+Nitrate donors did not influence serum nitrate, blood pressure, adipose inflammation, or myocardial fibrosis. However, microbiota from HFD+Nitrate mice decreased serum lipids, LV ROS, and similar to FMT from LFD donors, prevented glucose intolerance and cardiac morphology changes. Therefore, the cardioprotective effects of nitrate are not dependent on reducing blood pressure, but rather mitigating gut dysbiosis, highlighting a nitrate-gut-heart axis.
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Affiliation(s)
- Heather L Petrick
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
- Department of Human Biology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Maastricht, the Netherlands
| | - Leslie M Ogilvie
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Henver S Brunetta
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
- Department of Physiological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Avery Robinson
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Aleah J Kirsh
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Pierre-Andre Barbeau
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Rachel M Handy
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Bridget Coyle-Asbil
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Connor Gianetto-Hill
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Kaitlyn M J H Dennis
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Luc J C van Loon
- Department of Human Biology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Maastricht, the Netherlands
| | - Adrian Chabowski
- Department of Physiology, Medical University of Bialystok, Bialystok, Poland
| | - Jonathan D Schertzer
- Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute, and Centre for Metabolism, Obesity and Diabetes Research, McMaster University, Hamilton, Ontario, Canada
| | - Emma Allen-Vercoe
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Graham P Holloway
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
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Coyle-Asbil B, Ogilvie LM, Simpson JA. Emerging roles for estrogen in regulating skeletal muscle physiology. Physiol Genomics 2023; 55:75-78. [PMID: 36622080 DOI: 10.1152/physiolgenomics.00158.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Affiliation(s)
- Bridget Coyle-Asbil
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
| | - Leslie M Ogilvie
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
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Coyle-Asbil B, Holjak EJB, Marrow JP, Alshamali R, Ogilvie LM, Edgett BA, Hopkinson LD, Brunt KR, Simpson JA. Assessing systolic and diastolic reserves in male and female mice. Am J Physiol Heart Circ Physiol 2023; 324:H129-H140. [PMID: 36459449 DOI: 10.1152/ajpheart.00444.2022] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Cardiac reserve is a widely used health indicator and prognostic tool. Although it is well established how to assess cardiac reserve clinically, in preclinical models, it is more challenging lacking standardization. Furthermore, although cardiac reserve incorporates both systolic (i.e., contractile reserve) and diastolic (i.e., relaxation reserve) components of the cardiac cycle, less focus has been placed on diastolic reserve. The aim of our study was to determine which technique (i.e., echocardiography, invasive hemodynamic, and Langendorff) and corresponding parameters can be used to assess the systolic and diastolic reserves in preclinical models. Healthy adult male and female CD-1 mice were administered dobutamine and evaluated by echocardiography and invasive hemodynamic, or Langendorff to establish systolic and diastolic reserves. Here, we show that systolic reserve can be assessed using all techniques in vivo and in vitro. Yet, the current indices available are ineffective at capturing diastolic reserve of healthy mice in vivo. When assessing systolic reserve, sex affects the dose response of several commonly used echocardiography parameters [i.e., fractional shortening (FS), ejection fraction (EF)]. Taken together, this study improves our understanding of how sex impacts the interpretation assessment of cardiac reserve and establishes for the first time that in healthy adult mice, the diastolic reserve cannot be assessed by currently established methods in vivo.NEW & NOTEWORTHY Cardiac reserve is a globally used health indicator and prognostic tool that is used by clinicians and preclinical scientists. In physiology, we have a long-standing appreciation of how to assess systolic reserve but lack insight into sex differences and have no frame of reference for measuring diastolic reserve to certainty across cardiac techniques or the influence of sex. Here, we show that the primary means for assessing diastolic reserve is incorrect. Furthermore, we provided proof and clarity on how to correctly measure systolic and diastolic reserve capacities. We also highlight the imperative of sex differences to the measures of both systolic and diastolic reserves using several techniques (i.e., echocardiography, invasive hemodynamics, and Langendorff) in mice.
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Affiliation(s)
- B Coyle-Asbil
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
| | - E J B Holjak
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
| | - J P Marrow
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
| | - R Alshamali
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
| | - L M Ogilvie
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
| | - B A Edgett
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada.,Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada.,Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
| | - L D Hopkinson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
| | - K R Brunt
- IMPART Investigator Team Canada, Saint John, New Brunswick, Canada.,Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada
| | - J A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
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10
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Martin CE, Phippen NJ, Keyvani Chahi A, Tilak M, Banerjee SL, Lu P, New LA, Williamson CR, Platt MJ, Simpson JA, Krendel M, Bisson N, Gingras AC, Jones N. Complementary Nck1/2 Signaling in Podocytes Controls α Actinin-4-Mediated Actin Organization, Adhesion, and Basement Membrane Composition. J Am Soc Nephrol 2022; 33:1546-1567. [PMID: 35906089 PMCID: PMC9342632 DOI: 10.1681/asn.2021101343] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 04/26/2022] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Maintenance of the kidney filtration barrier requires coordinated interactions between podocytes and the underlying glomerular basement membrane (GBM). GBM ligands bind podocyte integrins, which triggers actin-based signaling events critical for adhesion. Nck1/2 adaptors have emerged as essential regulators of podocyte cytoskeletal dynamics. However, the precise signaling mechanisms mediated by Nck1/2 adaptors in podocytes remain to be fully elucidated. METHODS We generated podocytes deficient in Nck1 and Nck2 and used transcriptomic approaches to profile expression differences. Proteomic techniques identified specific binding partners for Nck1 and Nck2 in podocytes. We used cultured podocytes and mice deficient in Nck1 and/or Nck2, along with podocyte injury models, to comprehensively verify our findings. RESULTS Compound loss of Nck1/2 altered expression of genes involved in actin binding, cell adhesion, and extracellular matrix composition. Accordingly, Nck1/2-deficient podocytes showed defects in actin organization and cell adhesion in vitro, with podocyte detachment and altered GBM morphology present in vivo. We identified distinct interactomes for Nck1 and Nck2 and uncovered a mechanism by which Nck1 and Nck2 cooperate to regulate actin bundling at focal adhesions via α actinin-4. Furthermore, loss of Nck1 or Nck2 resulted in increased matrix deposition in vivo, with more prominent defects in Nck2-deficient mice, consistent with enhanced susceptibility to podocyte injury. CONCLUSION These findings reveal distinct, yet complementary, roles for Nck proteins in regulating podocyte adhesion, controlling GBM composition, and sustaining filtration barrier integrity.
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Affiliation(s)
- Claire E Martin
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada.,Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Noah J Phippen
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Ava Keyvani Chahi
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada.,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Manali Tilak
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Sara L Banerjee
- Division of Oncology, Centre de Recherche du Centre Hospitalier Universitaire de Quebec-Laval University, Quebec City, Quebec, Canada.,Centre de Recherche sur le Cancer de l'Université Laval, Quebec City, Quebec, Canada
| | - Peihua Lu
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Laura A New
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Casey R Williamson
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Mathew J Platt
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, Ontario, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, Ontario, Canada
| | - Mira Krendel
- Department of Cell and Developmental Biology, State University of New York Upstate Medical University, Syracuse, New York
| | - Nicolas Bisson
- Division of Oncology, Centre de Recherche du Centre Hospitalier Universitaire de Quebec-Laval University, Quebec City, Quebec, Canada.,Centre de Recherche sur le Cancer de l'Université Laval, Quebec City, Quebec, Canada.,PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications Department of Molecular Biology, Medical Biochemistry and Pathology, Laval University, Quebec City, Quebec, Canada
| | - Anne-Claude Gingras
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Nina Jones
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
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11
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McGrath JJC, Vanderstocken G, Dvorkin-Gheva A, Cass SP, Afkhami S, Fantauzzi MF, Thayaparan D, Reihani A, Wang P, Beaulieu A, Shen P, Morissette M, Jiménez-Saiz R, Revill SD, Tabuchi A, Zabini D, Lee WL, Richards CD, Miller MS, Ask K, Kuebler WM, Simpson JA, Stämpfli MR. Cigarette smoke augments CSF3 expression in neutrophils to compromise alveolar-capillary barrier function during influenza infection. Eur Respir J 2022; 60:2102049. [PMID: 35058252 DOI: 10.1183/13993003.02049-2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 12/29/2021] [Indexed: 11/05/2022]
Abstract
BACKGROUND Cigarette smokers are at increased risk of acquiring influenza, developing severe disease and requiring hospitalisation/intensive care unit admission following infection. However, immune mechanisms underlying this predisposition are incompletely understood, and therapeutic strategies for influenza are limited. METHODS We used a mouse model of concurrent cigarette smoke exposure and H1N1 influenza infection, colony-stimulating factor (CSF)3 supplementation/receptor (CSF3R) blockade and single-cell RNA sequencing (scRNAseq) to investigate this relationship. RESULTS Cigarette smoke exposure exacerbated features of viral pneumonia such as oedema, hypoxaemia and pulmonary neutrophilia. Smoke-exposed infected mice demonstrated an increase in viral (v)RNA, but not replication-competent viral particles, relative to infection-only controls. Interstitial rather than airspace neutrophilia positively predicted morbidity in smoke-exposed infected mice. Screening of pulmonary cytokines using a novel dysregulation score identified an exacerbated expression of CSF3 and interleukin-6 in the context of smoke exposure and influenza. Recombinant (r)CSF3 supplementation during influenza aggravated morbidity, hypothermia and oedema, while anti-CSF3R treatment of smoke-exposed infected mice improved alveolar-capillary barrier function. scRNAseq delineated a shift in the distribution of Csf3 + cells towards neutrophils in the context of cigarette smoke and influenza. However, although smoke-exposed lungs were enriched for infected, highly activated neutrophils, gene signatures of these cells largely reflected an exacerbated form of typical influenza with select unique regulatory features. CONCLUSION This work provides novel insight into the mechanisms by which cigarette smoke exacerbates influenza infection, unveiling potential therapeutic targets (e.g. excess vRNA accumulation, oedematous CSF3R signalling) for use in this context, and potential limitations for clinical rCSF3 therapy during viral infectious disease.
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Affiliation(s)
- Joshua J C McGrath
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
- Authors contributed equally
| | - Gilles Vanderstocken
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
- Authors contributed equally
| | - Anna Dvorkin-Gheva
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
| | - Steven P Cass
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
| | - Sam Afkhami
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
| | - Matthew F Fantauzzi
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
| | - Danya Thayaparan
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
| | - Amir Reihani
- Firestone Institute for Respiratory Health, St Joseph's Healthcare Hamilton, Hamilton, ON, Canada
- The Research Institute of St Joe's Hamilton, Hamilton, ON, Canada
| | - Peiyao Wang
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
| | - Ashley Beaulieu
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
| | - Pamela Shen
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
| | - Mathieu Morissette
- Dept of Medicine, Université Laval, Quebec City, QC, Canada
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada
| | - Rodrigo Jiménez-Saiz
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
- Dept of Immunology, Instituto de Investigación Sanitaria Hospital Universitario de La Princesa, Madrid, Spain
- Dept of Immunology and Oncology, Centro Nacional de Biotecnología (CNB)-CSIC, Madrid, Spain
- Faculty of Experimental Sciences, Universidad Francisco de Vitoria, Madrid, Spain
| | - Spencer D Revill
- Firestone Institute for Respiratory Health, St Joseph's Healthcare Hamilton, Hamilton, ON, Canada
- The Research Institute of St Joe's Hamilton, Hamilton, ON, Canada
| | - Arata Tabuchi
- Keenan Research Centre for Biomedical Science, St Michael's Hospital, Toronto, ON, Canada
| | - Diana Zabini
- Keenan Research Centre for Biomedical Science, St Michael's Hospital, Toronto, ON, Canada
| | - Warren L Lee
- Keenan Research Centre for Biomedical Science, St Michael's Hospital, Toronto, ON, Canada
| | - Carl D Richards
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
| | - Matthew S Miller
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, Canada
- Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON, Canada
| | - Kjetil Ask
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
- Firestone Institute for Respiratory Health, St Joseph's Healthcare Hamilton, Hamilton, ON, Canada
| | - Wolfgang M Kuebler
- Keenan Research Centre for Biomedical Science, St Michael's Hospital, Toronto, ON, Canada
- Institute of Physiology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Jeremy A Simpson
- Dept of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Martin R Stämpfli
- McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada
- Dept of Medicine, McMaster University, Hamilton, ON, Canada
- Firestone Institute for Respiratory Health, St Joseph's Healthcare Hamilton, Hamilton, ON, Canada
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12
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Holjak EJB, Savinova I, Nelson VL, Ogilvie LM, Ng AM, Edgett BA, Platt MJ, Brunt KR, Ask K, Simpson JA. An Evaluation of Cardiac Health in the Spontaneously Hypertensive Rat Colony: Implications of Evolutionary Driven Increases in Concentric Hypertrophy. Am J Hypertens 2022; 35:264-271. [PMID: 34605538 DOI: 10.1093/ajh/hpab155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 09/13/2021] [Accepted: 09/21/2021] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND The Spontaneously Hypertensive Rat (SHR) Colony was established in 1963 and is the most commonly used rodent model for studying heart failure (HF). Ideally, animal models should recapitulate the clinical disease as closely as possible. Any drift in a genetic model may create a new model that no longer adequately represents the human pathology. Further, instability overtime may lead to conflicting data between laboratories and/or irreproducible results. While systolic blood pressure (SBP) is closely monitored during inbreeding, the sequelae of HF (e.g., cardiac hypertrophy) are not. Thus, the object of this review was to investigate whether the hypertension-induced sequelae of HF in the SHR have remained stable after decades of inbreeding. METHODS A systematic review was performed to evaluate indices of cardiovascular health in the SHR over the past 60 years. For post hoc statistical analyses, studies were separated into 2 cohorts: Initial (mid to late 1900s) and Current (early 2000s to present) Colony SHRs. Wistar-Kyoto rats (WKY) were used as controls. RESULTS SBP was consistent between Initial and Current Colony SHRs. However, Current Colony SHRs presented with increased concentric hypertrophy (i.e., elevated heart weight and posterior wall thickness) while cardiac output remained consistent. Since these changes were not observed in the WKY controls, cardiac-derived changes in Current Colony SHRs were unlikely due to differences in environmental conditions. CONCLUSIONS Together, these data firmly establish a cardiac-based phenotypic shift in the SHR model and provide important insights into the beneficial function of concentric hypertrophy in hypertension-induced HF.
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Affiliation(s)
- Emma J B Holjak
- Department of Human Health & Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Iryna Savinova
- Department of Human Health & Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
- IMPART Investigator Team, Saint John, New Brunswick, Canada
| | - Victoria L Nelson
- IMPART Investigator Team, Saint John, New Brunswick, Canada
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada
| | - Leslie M Ogilvie
- Department of Human Health & Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
- IMPART Investigator Team, Saint John, New Brunswick, Canada
| | - Anabelle M Ng
- Department of Human Health & Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Brittany A Edgett
- Department of Human Health & Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
- IMPART Investigator Team, Saint John, New Brunswick, Canada
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada
| | - Mathew J Platt
- Department of Human Health & Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Keith R Brunt
- IMPART Investigator Team, Saint John, New Brunswick, Canada
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada
| | - Kjetil Ask
- Department of Medicine, McMaster University and The Research Institute of St. Joe’s Hamilton, Firestone Institute for Respiratory Health, Hamilton, Ontario, Canada
- Department of Pathology and Molecular Medicine, McMaster Immunology Research Centre, McMaster University, Hamilton, Ontario, Canada
| | - Jeremy A Simpson
- Department of Human Health & Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
- IMPART Investigator Team, Saint John, New Brunswick, Canada
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13
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Ogilvie LM, Edgett BA, Gray S, Al-Mufty S, Huber JS, Brunt KR, Simpson JA. A new approach to improve the hemodynamic assessment of cardiac function independent of respiratory influence. Sci Rep 2021; 11:17223. [PMID: 34446745 PMCID: PMC8390640 DOI: 10.1038/s41598-021-96050-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 07/19/2021] [Indexed: 01/06/2023] Open
Abstract
Cardiovascular and respiratory systems are anatomically and functionally linked; inspiration produces negative intrathoracic pressures that act on the heart and alter cardiac function. Inspiratory pressures increase with heart failure and can exceed the magnitude of ventricular pressure during diastole. Accordingly, respiratory pressures may be a confounding factor to assessing cardiac function. While the interaction between respiration and the heart is well characterized, the extent to which systolic and diastolic indices are affected by inspiration is unknown. Our objective was to understand how inspiratory pressure affects the hemodynamic assessment of cardiac function. To do this, we developed custom software to assess and separate indices of systolic and diastolic function into inspiratory, early expiratory, and late expiratory phases of respiration. We then compared cardiac parameters during normal breathing and with various respiratory loads. Variations in inspiratory pressure had a small impact on systolic pressure and function. Conversely, diastolic pressure strongly correlated with negative inspiratory pressure. Cardiac pressures were less affected by respiration during expiration; late expiration was the most stable respiratory phase. In conclusion, inspiration is a large confounding influence on diastolic pressure, but minimally affects systolic pressure. Performing cardiac hemodynamic analysis by accounting for respiratory phase yields more accuracy and analytic confidence to the assessment of diastolic function.
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Affiliation(s)
- Leslie M Ogilvie
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada
- IMPART Investigator Team Canada, Saint John, Canada
| | - Brittany A Edgett
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, NB, Canada
- IMPART Investigator Team Canada, Saint John, Canada
| | - Simon Gray
- Cambridge Electronic Design Limited, Milton, Cambridge, England
| | - Sally Al-Mufty
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada
- IMPART Investigator Team Canada, Saint John, Canada
| | - Jason S Huber
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, NB, Canada
- IMPART Investigator Team Canada, Saint John, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada.
- IMPART Investigator Team Canada, Saint John, Canada.
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14
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Ogilvie LM, Coyle-Asbil B, Brunt KR, Simpson JA. Regional cardiac strain mapping by four-dimensional ultrasound provides earlier detection of systolic and diastolic dysfunction. Am J Physiol Heart Circ Physiol 2021; 321:H306-H308. [PMID: 34213391 DOI: 10.1152/ajpheart.00335.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Leslie M Ogilvie
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team, Canada
| | - Bridget Coyle-Asbil
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada.,IMPART Investigator Team, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team, Canada
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15
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Wen PY, de Groot J, Battiste JD, Goldlust SA, Damek D, Garner JS, Simpson JA, Olivero A, Cloughesy T. Abstract LB125: Pharmacokinetics of paxalisib in phase 2 clinical study in glioblastoma (GBM) with unmethylated O6-methylguanine-methyltransferase (MGMT) promotor status. Cancer Res 2021. [DOI: 10.1158/1538-7445.am2021-lb125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Introduction: Paxalisib is a potent, oral, selective, brain-penetrant, small molecule inhibitor of class I phosphoinositide 3-kinase and mammalian target of rapamycin. Paxalisib is taken daily on a continuous basis in 28-day cycles. A phase I study (NCT01547S46) in recurrent high-grade gliomas identified an MTD of 45mg daily and is complete. This phase II study (NCT03522298) in patients with newly diagnosed GBM and an unmethylated MGMT promotor identified an MTD of 60mg daily and is now fully recruited and in follow-up. The phase I study showed paxalisib was rapidly absorbed (Tmax approx 2 hours) and displayed an approximately linear and dose proportional increase in Cmax and AUC0-24, with a half-life of approximately 18.7 hours, which is supportive of once-daily dosing. This study explores pharmacokinetics in a slightly different patient population, at an increased dose, and explores the effect of food. Methods: For all patients, on Day 1 of Cycle 1, plasma samples were collected at least 15 minutes prior to the visit dose, and then at 30 minutes, 1, 2, 3, 4, 6, 8, 24 hours post dose. In the escalation portion of the study (Stage 1), patients fasted for 10 hours pre-dose on PK days. In the expansion portion of this study (Stage 2), subjects were randomized to be fasted for 10 hours pre-dose or consume a high-fat, high-calorie meal approximately 30 minutes prior to dosing, on PK days. All samples were analyzed by a central laboratory using a validated LC/MS-MS method. Analysis was non-compartmental. Results: A total of 30 patients were dosed and PK analysis performed, 24 at the 60 mg dose (14 fasted/10 fed) and 6 at the 75mg dose (all fasted). Paxalisib was rapidly and steadily absorbed at the 60 mg and 75 mg dose levels in the fasted state, with median Tmax values of 3.50 (2-8) and 2.50 (2-4) hours post-dose respectively. The geometric mean (range) of t1/2 values for the 60 mg fasted , 60 mg fed , and 75 mg fasted dose levels were 21.3 hours (6.0-54.6), 19.6 hours (7.7-30.0), and 29.2 hours (15.0-88.2), respectively. Mean systemic exposure to paxalisib at fasted state based on AUC0-∞ increased in a manner that was slightly less than dose proportional between 60 mg and 75 mg dose levels. This is probably indicative of a saturation effect at the 75 mg dose. Systemic exposure to paxalisib increased for the 60 mg fed status compared to 60 mg fasted status. Geometric mean ratios for Cmax, AUClast, and AUC0-∞ were 1.40, 1.38, and 1.12, respectively. Conclusion: The pharmacokinetics of paxalisib in newly-diagnosed patients are similar to those in recurrent patients, and remain compatible with daily oral dosing. There is evidence that PK parameters begin to show saturation at doses higher than 60 mg, likely representing the limit of solubility of the molecule. Paxalisib demonstrates a mild food effect, which is unlikely to necessitate fasted administration in clinical practice. These data inform further ongoing studies with paxalisib and have just commenced recruitment into the pivotal GBM AGILE study (NCT03970447).
Citation Format: Patrick Y. Wen, John de Groot, James D. Battiste, Samuel A. Goldlust, Denise Damek, James S. Garner, Jeremy A. Simpson, Alan Olivero, Timothy Cloughesy. Pharmacokinetics of paxalisib in phase 2 clinical study in glioblastoma (GBM) with unmethylated O6-methylguanine-methyltransferase (MGMT) promotor status [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr LB125.
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Affiliation(s)
- Patrick Y. Wen
- 1Center for Neuro-Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA
| | - John de Groot
- 2Department of Neuro-Oncology, Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, United States, Houston, TX
| | | | - Samuel A. Goldlust
- 4John Theurer Cancer Center, Hackensack University Medical Center, Hackensack, NJ
| | - Denise Damek
- 5Department of Neurology, University of Colorado School of Medicine, Aurora, CO
| | | | | | | | - Timothy Cloughesy
- 8Department of Neurology, Ronald Reagan UCLA Medical Center, University of California, Los Angeles, CA
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16
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Dial AG, Monaco CMF, Grafham GK, Romanova N, Simpson JA, Tarnopolsky MA, Perry CGR, Kalaitzoglou E, Hawke TJ. Muscle and serum myostatin expression in type 1 diabetes. Physiol Rep 2021; 8:e14500. [PMID: 32652899 PMCID: PMC7354085 DOI: 10.14814/phy2.14500] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 06/02/2020] [Accepted: 06/03/2020] [Indexed: 12/17/2022] Open
Abstract
Type 1 diabetes (T1D) has been reported to negatively affect the health of skeletal muscle, though the underlying mechanisms are unknown. Myostatin, a myokine whose increased expression is associated with muscle‐wasting diseases, has not been reported in humans with T1D but has been demonstrated to be elevated in preclinical diabetes models. Thus, the purpose of this study was to determine if there is an elevated expression of myostatin in the serum and skeletal muscle of persons with T1D compared to controls. Secondarily, we aimed to explore relationships between myostatin expression and clinically important metrics (e.g., HbA1c, strength, lean mass) in women and men with (N = 31)/without T1D (N = 24) between 18 and 72 years old. Body composition, baseline strength, blood sample and vastus lateralis muscle biopsy were evaluated. Serum, but not muscle, myostatin expression was significantly elevated in those with T1D versus controls, and to a greater degree in T1D women than T1D men. Serum myostatin levels were not significantly associated with HbA1c nor disease duration. A significant correlation between serum myostatin expression and maximal voluntary contraction (MVC) and body fat mass was demonstrated in control subjects, but these correlations did not reach significance in those with T1D (MVC: R = 0.64 controls vs. R = 0.37 T1D; Body fat: R = −0.52 controls/R = −0.02 T1D). Collectively, serum myostatin was correlated with lean mass (R = 0.45), and while this trend was noted in both groups separately, neither reached statistical significance (R = 0.47 controls/R = 0.33 T1D). Overall, while those with T1D exhibited elevated serum myostatin levels (particularly females) myostatin expression was not correlated with clinically relevant metrics despite some of these relationships existing in controls (e.g., lean/fat mass). Future studies will be needed to fully understand the mechanisms underlying increased myostatin in T1D, with relationships to insulin dosing being particularly important to elucidate.
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Affiliation(s)
- Athan G Dial
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Cynthia M F Monaco
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Grace K Grafham
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Nadya Romanova
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | | | | | - Evangelia Kalaitzoglou
- Barnstable Brown Diabetes Center and Department of Pediatrics, University of Kentucky, Lexington, KY, USA
| | - Thomas J Hawke
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
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17
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Bailey JA, Khawaja A, Andrews H, Weller J, Chapman C, Morling JR, Oliver S, Castle S, Simpson JA, Humes DJ, Banerjea A. GP access to FIT increases the proportion of colorectal cancers detected on urgent pathways in symptomatic patients in Nottingham. Surgeon 2021; 19:93-102. [PMID: 32327303 DOI: 10.1016/j.surge.2020.03.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 03/13/2020] [Indexed: 12/27/2022]
Abstract
OBJECTIVE Service evaluation of GP access to Faecal Immunochemical Test (FIT) for colorectal cancer (CRC) detection in Nottinghamshire and use of FIT for "rule out", "rule in" and "first test selection". DESIGN Retrospective audit of FIT results, CRC outcomes and resource utilisation before and after introduction of FIT in Primary Care in November 2017. Data from the new pathway up to December 2018 was compared with previous experience. RESULTS Between November 2017 and December 2018, 6747 GP FIT test requests yielded 5733 FIT results, of which 4082 (71.2%) were <4.0 μg Hb/g faeces, 579 (10.1%) were 4.0-9.9 μg Hb/g faeces, 836 (14.6%) were 10.0-149.9 μg Hb/g faeces, and 236 (4.1%) were ≥150.0 μg Hb/g faeces. The proportion of "rule out" results <4.0 μg Hb/g faeces was significantly higher than in the Getting FIT cohort (71.2% vs 60.4%, Chi squared 42.8, p < 0.0001) and the proportion of "rule in" results ≥150.0 μg Hb/g faeces was significantly lower (4.1% vs 8.1%, Chi squared 27.3,P < 0.0001). There was a 33% rise in urgent referrals across Nottingham overall during the evaluation period. 2 CRC diagnoses were made in 4082 patients who had FIT<4.0 μg Hb/g faeces. 58.4% of new CRC diagnoses associated with a positive FIT were early stage cancers (Stage I and II). The proportion of all CRC diagnoses that follow an urgent referral s rose after introduction of FIT. CONCLUSIONS FIT allows GP's to select a more appropriate cohort for urgent investigation without a large number of missed diagnoses. FIT appears to promise a "stage migration" effect which may ultimately improve CRC outcomes.
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Affiliation(s)
- J A Bailey
- Nottingham Colorectal Service, E Floor West Block, QMC Campus, Nottingham University Hospitals NHS Trust, Nottingham, NG7 2UH, UK.
| | - A Khawaja
- Nottingham Colorectal Service, E Floor West Block, QMC Campus, Nottingham University Hospitals NHS Trust, Nottingham, NG7 2UH, UK
| | - H Andrews
- Nottingham Colorectal Service, E Floor West Block, QMC Campus, Nottingham University Hospitals NHS Trust, Nottingham, NG7 2UH, UK
| | - J Weller
- Nottingham Colorectal Service, E Floor West Block, QMC Campus, Nottingham University Hospitals NHS Trust, Nottingham, NG7 2UH, UK
| | - C Chapman
- Eastern Hub, Bowel Cancer Screening Programme, A Floor West Block, QMC Campus, Nottingham University Hospitals NHS Trust, Nottingham, NG7 2UH, UK
| | - J R Morling
- NIHR Nottingham Biomedical Research Centre (BRC), Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, NG7 2UH, UK; Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Clinical Sciences Building 2, City Hospital, Nottingham, NG5 1PB, UK
| | - S Oliver
- Nottingham City Clinical Commissioning Group, Nottingham, UK
| | - S Castle
- Nottingham City Clinical Commissioning Group, Nottingham, UK
| | - J A Simpson
- Nottingham Colorectal Service, E Floor West Block, QMC Campus, Nottingham University Hospitals NHS Trust, Nottingham, NG7 2UH, UK
| | - D J Humes
- Nottingham Colorectal Service, E Floor West Block, QMC Campus, Nottingham University Hospitals NHS Trust, Nottingham, NG7 2UH, UK; NIHR Nottingham Biomedical Research Centre (BRC), Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, NG7 2UH, UK; Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Clinical Sciences Building 2, City Hospital, Nottingham, NG5 1PB, UK
| | - A Banerjea
- Nottingham Colorectal Service, E Floor West Block, QMC Campus, Nottingham University Hospitals NHS Trust, Nottingham, NG7 2UH, UK
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18
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Bailey JA, Weller J, Chapman CJ, Ford A, Hardy K, Oliver S, Morling JR, Simpson JA, Humes DJ, Banerjea A. Faecal immunochemical testing and blood tests for prioritization of urgent colorectal cancer referrals in symptomatic patients: a 2-year evaluation. BJS Open 2021; 5:6162967. [PMID: 33693553 PMCID: PMC7947575 DOI: 10.1093/bjsopen/zraa056] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 11/15/2020] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND A novel pathway incorporating faecal immunochemical testing (FIT) for rapid colorectal cancer diagnosis (RCCD) was introduced in 2017. This paper reports on the service evaluation after 2 years of pathway implementation. METHODS The RCCD protocol was based on FIT, blood results and symptoms to stratify adult patients in primary care. Two-week-wait (2WW) investigation was indicated for patients with rectal bleeding, rectal mass and faecal haemoglobin (fHb) level of 10 µg Hb/g faeces or above or 4 µg Hb/g faeces or more in the presence of anaemia, low ferritin or thrombocytosis, in all other symptom groups. Patients with 100 µg Hb/g faeces or above had expedited investigation . A retrospective audit of colorectal cancer detected between 2017 and 2019 was conducted, fHb thresholds were reviewed and critically assessed for cancer diagnoses. RESULTS In 2 years, 14788 FIT tests were dispatched with 13361 (90.4 per cent) completed returns. Overall, fHb was less than 4 µg Hb/g faeces in 9208 results (68.9 per cent), 4-9.9 µg Hb/g in 1583 (11.8 per cent), 10-99.9 µg Hb/g in 1850 (13.8 per cent) and 100 µg Hb/g faeces or above in 720 (5.4 per cent). During follow-up (median 10.4 months), 227 colorectal cancers were diagnosed. The cancer detection rate was 0.1 per cent in patients with fHb below 4 µg Hb/g faeces, 0.6 per cent in those with fHb 4-9.9 µg Hb/g faeces, 3.3 per cent for fHb 10-99.9 µg Hb/g faeces and 20.7 per cent for fHb 100 µg Hb/g faeces or above. The detection rate in the cohort with 10-19.9 µg Hb/g faeces was 1.4 per cent, below the National Institute for Health and Care Excellence threshold for urgent referral. The colorectal cancer rate in patients with fHb below 20 µg Hb/g faeces was less than 0.3 per cent. CONCLUSION Use of FIT to "rule out" urgent referral from primary care misses a small number of cases. The threshold for referral may be adjusted with blood results to improve stratification .
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Affiliation(s)
- J A Bailey
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - J Weller
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - C J Chapman
- Eastern Hub, Bowel Cancer Screening Programme, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - A Ford
- Eastern Hub, Bowel Cancer Screening Programme, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - K Hardy
- Eastern Hub, Bowel Cancer Screening Programme, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - S Oliver
- Nottingham City Clinical Commissioning Group, Nottingham,UK
| | - J R Morling
- National Institute for Health Research Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and University of Nottingham, Nottingham, UK,Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham, UK
| | - J A Simpson
- Eastern Hub, Bowel Cancer Screening Programme, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - D J Humes
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK,National Institute for Health Research Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and University of Nottingham, Nottingham, UK,Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham, UK,Correspondence to: Nottingham Colorectal Service, E Floor West Block, Queen’s Medical Centre Campus, Nottingham University Hospitals NHS Trust, Derby Road, Nottingham NG7 2UH, UK (e-mail: )
| | - A Banerjea
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
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19
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Bailey JA, Ibrahim H, Bunce J, Chapman CJ, Morling JR, Simpson JA, Humes DJ, Banerjea A. Quantitative FIT stratification is superior to NICE referral criteria NG12 in a high-risk colorectal cancer population. Tech Coloproctol 2021; 25:1151-1154. [PMID: 34263362 PMCID: PMC8279105 DOI: 10.1007/s10151-021-02466-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 05/16/2021] [Indexed: 11/26/2022]
Abstract
BACKGROUND Guidelines for urgent investigation of colorectal cancer (CRC) are based on age and symptom-based criteria. This study aims to compare the diagnostic value of clinical features and faecal immunochemical test (FIT) results to identify those at a higher risk of CRC, thereby facilitating effective triage of patients. METHODS We undertook a review of all patients referred for investigation of CRC at our centre between September 2016 and June 2018. Patients were identified using a prospectively recorded local database. We performed a logistic regression analysis of factors associated with a diagnosis of CRC. RESULTS One-thousand-and-seven-hundred-eighty-four patients with FIT results were included in the study. Change in bowel habit (CIBH) was the most common referring clinical feature (38.3%). Patients diagnosed with CRC were significantly older than those without malignancy (74.0 years vs 68.9 years, p = 0.0007). Male patients were more likely to be diagnosed with CRC than females (6.5% vs 2.5%, Chi-squared 16.93, p < 0.0001). CRC was diagnosed in 3.5% (24/684) with CIBH compared to 8.1% (6/74) with both CIBH and iron deficiency anaemia. No individual or combination of referring clinical features was associated with an increased diagnosis of CRC (Chi-squared, 8.03, p = 0.155). Three patients with negative FIT results (< 4 µg Hb/g faeces) were diagnosed with CRC (3/1027, 0.3%). The highest proportion of cancers detected was in the ≥ 100 µg Hb/g faeces group (55/181, 30.4%). CONCLUSION In a multivariate model, FIT outperforms age, sex and all symptoms prompting referral. FIT has greater stratification value than any referral symptoms. FIT does have value in patients with iron deficiency anaemia.
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Affiliation(s)
- J A Bailey
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK.
- School of Medicine, Queens Medical Centre, University of Nottingham, Nottingham, NG7 2UH, UK.
| | - H Ibrahim
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - J Bunce
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - C J Chapman
- Eastern Hub, Bowel Cancer Screening Programme, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - J R Morling
- NIHR Nottingham Biomedical Research Centre (BRC), Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK
- Division of Epidemiology and Public Health, School of Medicine, University of NottinghamCity Hospital, Nottingham, UK
| | - J A Simpson
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - D J Humes
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
- NIHR Nottingham Biomedical Research Centre (BRC), Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK
- Division of Epidemiology and Public Health, School of Medicine, University of NottinghamCity Hospital, Nottingham, UK
| | - A Banerjea
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
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20
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Vanderstocken G, Marrow JP, Allwood MA, Stampfli MR, Simpson JA. Disruption of Physiological Rhythms Persist Following Cessation of Cigarette Smoke Exposure in Mice. Front Physiol 2020; 11:501383. [PMID: 33192539 PMCID: PMC7609783 DOI: 10.3389/fphys.2020.501383] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Accepted: 09/28/2020] [Indexed: 01/29/2023] Open
Abstract
Background Physiological rhythms in mammals are essential for maintaining health, whereas disruptions may cause or exacerbate disease pathogenesis. As such, our objective was to characterize how cigarette smoke exposure affects physiological rhythms of otherwise healthy mice using telemetry and cosinor analysis. Methods Female BALB/c mice were implanted with telemetry devices to measure body temperature, heart rate, systolic blood pressure (SBP), and activity. Following baseline measurements, mice were exposed to cigarette smoke for approximately 50 min twice daily during weekdays over 24 weeks. Physiological parameters were recorded after 1, 4, 8, and 24 weeks of exposure or after 4 weeks cessation following 4 weeks of cigarette smoke exposure. Results Acute cigarette smoke exposure resulted in anapyrexia, and bradycardia, with divergent effects on SBP. Long term, cigarette smoke exposure disrupted physiological rhythms after just 1 week, which persisted across 24 weeks of exposure (as shown by mixed effects on mesor, amplitude, acrophase, and goodness-of-fit using cosinor analysis). Four weeks of cessation was insufficient to allow full recovery of rhythms. Conclusion Our characterization of the pathophysiology of cigarette smoke exposure on physiological rhythms of mice suggests that rhythm disruption may precede and contribute to disease pathogenesis. These findings provide a clear rationale and guide for the future use of chronotherapeutics.
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Affiliation(s)
- Gilles Vanderstocken
- Department of Pathology and Molecular Medicine, McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada.,Department of Medicine, Firestone Institute for Respiratory Health at St. Joseph's Healthcare, McMaster University, Hamilton, ON, Canada
| | - Jade P Marrow
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada.,IMPART Team Canada Investigator Network, Guelph, ON, Canada
| | - Melissa A Allwood
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Martin R Stampfli
- Department of Pathology and Molecular Medicine, McMaster Immunology Research Centre, McMaster University, Hamilton, ON, Canada.,Department of Medicine, Firestone Institute for Respiratory Health at St. Joseph's Healthcare, McMaster University, Hamilton, ON, Canada.,State Key Laboratory of Respiratory Disease, Guangzhou Medical University, Guangzhou, China
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada.,IMPART Team Canada Investigator Network, Guelph, ON, Canada
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21
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Foster AJ, Marrow JP, Allwood MA, Brunt KR, Simpson JA. Applications of a novel radiotelemetry method for the measurement of intrathoracic pressures and physiological rhythms in freely behaving mice. J Appl Physiol (1985) 2020; 129:992-1005. [PMID: 32881619 DOI: 10.1152/japplphysiol.00673.2019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Techniques to comprehensively evaluate pulmonary function carry a variety of limitations, including the ability to continuously record intrathoracic pressures (ITP), acutely and chronically, in a natural state of freely behaving animals. Measurement of ITP can be used to derive other respiratory parameters, which provide insight to lung health. Our aim was to develop a surgical approach for the placement of a telemetry pressure sensor to measure ITP, providing the ability to chronically measure peak pressure, breath frequency, and timing of the respiratory cycle to facilitate circadian analyses related to breathing patterns. Applications of this technique are shown using a moderate hypoxic challenge. Male C57Bl/6 mice were implanted with radiotelemetry devices to record heart rate, temperature, activity, and ITP during 24-h normoxia, 24-h hypoxia ([Formula: see text] = 0.15), and return to 48-h normoxia. Radiotelemetry of ITP permitted the detection of hypoxia-induced increases in "the ITP equivalent" of ventilation, which were driven by increases in breathing frequency and ITP on a short-term time scale. Respiratory frequency, derived from pressure waveforms, was increased by a decrease in expiratory time without changes in inspiratory time. Chronically, telemetric recording allowed for circadian analyses of respiratory drive, as assessed by inspiratory pressure divided by inspiratory time, which was increased by hypoxia and remained elevated for 48 h of recovery. Furthermore, respiratory frequency demonstrated a circadian rhythm, which was disrupted through the recovery period. In conclusion, radiotelemetry of ITP is a viable, long-term, chronic methodology that extends traditional methods to evaluate respiratory function in mice.NEW & NOTEWORTHY We have demonstrated for the first time in mice that radiotelemetry is an effective tool for the continuous and chronic recording of intrathoracic pressure (ITP) to facilitate circadian rhythm analyses. We show that continuous 24-h hypoxic stress alters the circadian rhythms of heart rate, body temperature, activity, and respiratory parameters, acutely and perpetually, through normoxic recovery. Radiotelemetry of ITP can complement traditional methods for evaluating respiratory function and better our understanding of respiratory pathophysiology.
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Affiliation(s)
- Andrew J Foster
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Jade P Marrow
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Team Canada Investigator Network, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada
| | - Melissa A Allwood
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada.,IMPART Team Canada Investigator Network, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Team Canada Investigator Network, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada
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Wen PY, de Groot J, Battiste JD, Goldlust SA, Garner JS, Simpson JA, Kijlstra J, Olivero A, Cloughesy T. Abstract CT205: Phase 2 study to evaluate the safety, pharmacokinetics, and clinical activity of the PI3K / mTOR inhibitor paxalisib (GDC-0084) in glioblastoma (GBM) with unmethylated O6-methylguanine-methyltransferase (MGMT) promotor status. Cancer Res 2020. [DOI: 10.1158/1538-7445.am2020-ct205] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Introduction: Paxalisib (previously GDC-0084) is a potent, oral, selective, brain-penetrant, small molecule inhibitor of class I phosphoinositide 3-kinase and mammalian target of rapamycin. The PI3K pathway is upregulated in ~85% of GBM cases and paxalisib has shown efficacy in preclinical models. A phase I study (NCT01547546) investigated paxalisib dosed once daily in 47 patients with recurrent high-grade gliomas and established a maximum tolerated dose (MTD) of 45mg once daily. The current phase II study (NCT03522298) aims to explore the safety, tolerability, and clinical activity of paxalisib in newly diagnosed GBM and an unmethylated MGMT promotor following surgery and temozolomide chemoradiation per Stupp regimen. Methods: This study has a 2-part design: an open-label, dose-escalation phase to assess the safety, tolerability and MTD (Part 1), followed by an expansion cohort (Part 2) at the MTD. Dose-escalation started at 60mg and progressed in 15mg increments using a 3+3 design. Part 2 recruits 20 patients who are randomised to administration in fed or fasted states. Results: Part 1 is complete. Nine patients were recruited and an MTD of 60mg was determined. DLTs were hyperglycemia and oral mucositis, with toxicity and patterns of AEs consistent with prior experience and other PI3K-targeting agents. For eight response-evaluable patients in Part 1, the median progression-free survival (PFS) was 8.4 months, and 25% of patients remained progression free after 15 months of follow-up. Part 2 is ongoing.
Citation Format: Patrick Y. Wen, John de Groot, James D. Battiste, Samuel A. Goldlust, James S. Garner, Jeremy A. Simpson, Jelle Kijlstra, Alan Olivero, Timothy Cloughesy. Phase 2 study to evaluate the safety, pharmacokinetics, and clinical activity of the PI3K / mTOR inhibitor paxalisib (GDC-0084) in glioblastoma (GBM) with unmethylated O6-methylguanine-methyltransferase (MGMT) promotor status [abstract]. In: Proceedings of the Annual Meeting of the American Association for Cancer Research 2020; 2020 Apr 27-28 and Jun 22-24. Philadelphia (PA): AACR; Cancer Res 2020;80(16 Suppl):Abstract nr CT205.
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Affiliation(s)
- Patrick Y. Wen
- 1Center for Neuro-Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA
| | - John de Groot
- 2Department of Neuro-Oncology, Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - James D. Battiste
- 3Stephenson Cancer Center, University of Oklahoma, Oklahoma City, OK
| | - Samuel A. Goldlust
- 4John Theurer Cancer Center, Hackensack University Medical Center, Hackensack, NJ
| | | | | | | | | | - Timothy Cloughesy
- 8Department of Neurology, Ronald Reagan UCLA Medical Center University of California, Los Angeles, CA
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23
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Bailey JA, Hanbali N, Premji K, Bunce J, Mashlab S, Simpson JA, Humes DJ, Banerjea A. Thrombocytosis helps to stratify risk of colorectal cancer in patients referred on a 2-week-wait pathway. Int J Colorectal Dis 2020; 35:1347-1350. [PMID: 32358719 PMCID: PMC7320058 DOI: 10.1007/s00384-020-03597-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/13/2020] [Indexed: 02/04/2023]
Abstract
PURPOSE Primary care studies suggest that thrombocytosis (platelet counts > 400 × 109/L) is associated with an increased risk of colorectal cancer (CRC). We aimed to establish whether this marker has significant stratification value in patients seen in secondary care. METHODS A retrospective review of 2991 patients referred to our colorectal 2-week-wait (2WW) pathway between August 2014 and August 2017. Patient demographics were recorded prospectively, and local electronic records systems were used to retrieve full blood counts (FBC) and cancer diagnoses. Patients with no recent platelet count at the time of referral or incomplete records were excluded. RESULTS 2236 patients were included in this evaluation. There was no significant difference in the age distribution of those with thrombocytosis and those without. There were significantly more females in the thrombocytosis group (72.1% vs 53.9%, chi-squared 24.63, p < 0.0001). 130 CRCs were detected (5.8%) and patients with thrombocytosis were more likely to have CRC (OR 2.62, 95% CI 1.60-4.30). The CRC diagnosis rate was significantly higher in females with thrombocytosis (10.3% vs 2.9%, chi-squared 19.41, p < 0.0001) and males with thrombocytosis (16.1% vs 7.9%, chi-squared 4.62, p = 0.032). CONCLUSION Thrombocytosis appears to have stratification value in the 2WW population. Further evaluation of its value alone or in combination with other stratification tests is required.
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Affiliation(s)
- J A Bailey
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, E Floor West Block, QMC Campus, Nottingham, NG7 2UH, UK.
| | - N Hanbali
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, E Floor West Block, QMC Campus, Nottingham, NG7 2UH, UK
| | - K Premji
- Department of Clinical Chemistry, City Hospital, Nottingham University Hospitals NHS Trust, Nottingham, NG5 1PB, UK
| | - J Bunce
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, E Floor West Block, QMC Campus, Nottingham, NG7 2UH, UK
| | - S Mashlab
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, E Floor West Block, QMC Campus, Nottingham, NG7 2UH, UK
| | - J A Simpson
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, E Floor West Block, QMC Campus, Nottingham, NG7 2UH, UK
| | - D J Humes
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, E Floor West Block, QMC Campus, Nottingham, NG7 2UH, UK
- Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Clinical Sciences Building, City Hospital, Nottingham, NG5 1PB, UK
| | - A Banerjea
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, E Floor West Block, QMC Campus, Nottingham, NG7 2UH, UK
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24
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Chapman C, Thomas C, Morling J, Tangri A, Oliver S, Simpson JA, Humes DJ, Banerjea A. Early clinical outcomes of a rapid colorectal cancer diagnosis pathway using faecal immunochemical testing in Nottingham. Colorectal Dis 2020; 22:679-688. [PMID: 31876975 DOI: 10.1111/codi.14944] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 11/29/2019] [Indexed: 12/29/2022]
Abstract
AIM We introduced primary care access to faecal immunochemical testing (FIT) as a stratification tool for symptomatic patients considered to be at risk of colorectal cancer (CRC) prior to urgent referral. We aimed to evaluate clinical and pathway outcomes during the first 6 months of this novel approach. METHOD FIT was recommended for all patients who consulted their general practitioner with lower gastrointestinal symptoms other than rectal bleeding and rectal mass. We undertook a retrospective audit of the results of FIT, related clinical outcomes and resource utilization on prospectively logged cases between November 2017 and May 2018. RESULTS Of the 1862 FIT kits dispatched by post 91.4% were returned, with a median return time of 7 days (range 2-110 days); however, 1.3% of returned kits could not be analysed. FIT results ≥ 150.0 μg haemoglobin (Hb)/g faeces identified patients with a significantly higher risk of CRC (30.9% vs 1.4%, chi-square 167.1, P < 0.0001). FIT results ≥ 10.0 μg Hb/g faeces identified patients with significantly higher risk of significant noncancer bowel pathology (24.1% vs 4.9%, chi-square 73.6, P < 0.0001) and FIT results < 4.0 μg Hb/g faeces identified a group more likely to have non-CRC pathology (5.1% vs 2.4%, chi-square 3.9, P < 0.05). The CRC detection rate in 531 patients investigated after a FIT result of < 4.0 μg Hb/g faeces was 0.2%. In 899 investigated patients, a FIT result with a threshold of 4.0 μg Hb/g faeces had sensitivity 97.2% (85.5-99.9% CI), specificity 61.4% (58.1-64.7% CI), negative predictive value 99.8% (98.7-100.0% CI) and positive predictive value 9.5% (8.7-10.4% CI). CONCLUSION A symptomatic pathway incorporating FIT is feasible and appears more clinically effective than pathways based on age and symptoms alone.
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Affiliation(s)
- C Chapman
- Eastern Hub, Bowel Cancer Screening Programme, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - C Thomas
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - J Morling
- Eastern Hub, Bowel Cancer Screening Programme, Nottingham University Hospitals NHS Trust, Nottingham, UK
- NIHR Nottingham Biomedical Research Centre (BRC), Nottingham University Hospitals NHS Trust, University of Nottingham, Nottingham, UK
- Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham, UK
| | - A Tangri
- Riverlyn Medical Centre, Nottingham, UK
| | - S Oliver
- Nottingham City Clinical Commissioning Group, Nottingham, UK
| | - J A Simpson
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - D J Humes
- Nottingham Colorectal Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
- NIHR Nottingham Biomedical Research Centre (BRC), Nottingham University Hospitals NHS Trust, University of Nottingham, Nottingham, UK
- Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham, UK
| | - A Banerjea
- Eastern Hub, Bowel Cancer Screening Programme, Nottingham University Hospitals NHS Trust, Nottingham, UK
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Marrow JP, Allwood MA, Platt MJ, Edgett BA, Romanova N, Alshamali R, Brunt KR, Simpson JA. Cardiac‐derived Erythropoietin: A Novel Therapeutic Strategy to Treat Myocardial Infarction? FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.00605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ogilvie LM, Edgett BA, Huber JS, Platt MJ, Brunt KR, Simpson JA. Hemodynamic Sex‐differences in Diastolic Function. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.03460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Allwood MA, Platt MJ, Huber JS, Jacyniak K, Edgett BA, Klein JM, Marrow JP, Alshamali R, Romanova N, Brunt KR, Vickaryous MK, Simpson JA. Paracrine Secretion of Cardiac‐Derived Erythropoietin is Required for Cardiogenesis. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.03773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Northrup V, Perez LJ, Edgett BA, Simpson JA, Brunt KR. Unraveling Intron Retention: Differential Expression Pattern in Brain and Kidney Cells After Hypoxia or Ischemia. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.02873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ogilvie LM, Edgett BA, Huber JS, Platt MJ, Eberl HJ, Lutchmedial S, Brunt KR, Simpson JA. Hemodynamic assessment of diastolic function for experimental models. Am J Physiol Heart Circ Physiol 2020; 318:H1139-H1158. [PMID: 32216614 DOI: 10.1152/ajpheart.00705.2019] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Traditionally, the evaluation of cardiac function has focused on systolic function; however, there is a growing appreciation for the contribution of diastolic function to overall cardiac health. Given the emerging interest in evaluating diastolic function in all models of heart failure, there is a need for sensitivity, accuracy, and precision in the hemodynamic assessment of diastolic function. Hemodynamics measure cardiac pressures in vivo, offering a direct assessment of diastolic function. In this review, we summarize the underlying principles of diastolic function, dividing diastole into two phases: 1) relaxation and 2) filling. We identify parameters used to comprehensively evaluate diastolic function by hemodynamics, clarify how each parameter is obtained, and consider the advantages and limitations associated with each measure. We provide a summary of the sensitivity of each diastolic parameter to loading conditions. Furthermore, we discuss differences that can occur in the accuracy of diastolic and systolic indices when generated by automated software compared with custom software analysis and the magnitude each parameter is influenced during inspiration with healthy breathing and a mild breathing load, commonly expected in heart failure. Finally, we identify key variables to control (e.g., body temperature, anesthetic, sampling rate) when collecting hemodynamic data. This review provides fundamental knowledge for users to succeed in troubleshooting and guidelines for evaluating diastolic function by hemodynamics in experimental models of heart failure.
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Affiliation(s)
- Leslie M Ogilvie
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
| | - Brittany A Edgett
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
| | - Jason S Huber
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Mathew J Platt
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Hermann J Eberl
- Department of Mathematics and Statistics, University of Guelph, Guelph, Ontario, Canada
| | - Sohrab Lutchmedial
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada.,Department of Cardiology, New Brunswick Heart Center, Saint John Regional Hospital, Horizon Health Network, Saint John, New Brunswick, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,IMPART Investigator Team Canada, Saint John, New Brunswick, Canada
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Barbeau PA, Houad JM, Huber JS, Paglialunga S, Snook LA, Herbst EAF, Dennis KMJH, Simpson JA, Holloway GP. Ablating the Rab-GTPase activating protein TBC1D1 predisposes rats to high-fat diet-induced cardiomyopathy. J Physiol 2020; 598:683-697. [PMID: 31845331 DOI: 10.1113/jp279042] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Accepted: 12/12/2019] [Indexed: 01/08/2023] Open
Abstract
KEY POINTS Although the role of TBC1D1 within the heart remains unknown, expression of TBC1D1 increases in the left ventricle following an acute infarction, suggesting a biological importance within this tissue. We investigated the mechanistic role of TBC1D1 within the heart, aiming to establish the consequences of attenuating TBC1D1 signalling in the development of diabetic cardiomyopathy, as well as to determine potential sex differences. TBC1D1 ablation increased plasma membrane fatty acid binding protein content and myocardial palmitate oxidation. Following high-fat feeding, TBC1D1 ablation dramatically increased fibrosis and induced end-diastolic dysfunction in both male and female rats in the absence of changes in mitochondrial bioenergetics. Altogether, independent of sex, ablating TBC1D1 predisposes the left ventricle to pathological remodelling following high-fat feeding, and suggests TBC1D1 protects against diabetic cardiomyopathy. ABSTRACT TBC1D1, a Rab-GTPase activating protein, is involved in the regulation of glucose handling and substrate metabolism within skeletal muscle, and is essential for maintaining pancreatic β-cell mass and insulin secretion. However, the function of TBC1D1 within the heart is largely unknown. Therefore, we examined the role of TBC1D1 in the left ventricle and the functional consequence of ablating TBC1D1 on the susceptibility to high-fat diet-induced abnormalities. Since mutations within TBC1D1 (R125W) display stronger associations with clinical parameters in women, we further examined possible sex differences in the predisposition to diabetic cardiomyopathy. In control-fed animals, TBC1D1 ablation did not alter insulin-stimulated glucose uptake, or echocardiogram parameters, but increased accumulation of a plasma membrane fatty acid transporter and the capacity for palmitate oxidation. When challenged with an 8 week high-fat diet, TBC1D1 knockout rats displayed a four-fold increase in fibrosis compared to wild-type animals, and this was associated with diastolic dysfunction, suggesting a predisposition to diet-induced cardiomyopathy. Interestingly, high-fat feeding only induced cardiac hypertrophy in male TBC1D1 knockout animals, implicating a possible sex difference. Mitochondrial respiratory capacity and substrate sensitivity to pyruvate and ADP were not altered by diet or TBC1D1 ablation, nor were markers of oxidative stress, or indices of overt heart failure. Altogether, independent of sex, ablation of TBC1D1 not only increased the susceptibility to high-fat diet-induced diastolic dysfunction and left ventricular fibrosis, independent of sex, but also predisposed male animals to the development of cardiac hypertrophy. These data suggest that TBC1D1 may exert cardioprotective effects in the development of diabetic cardiomyopathy.
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Affiliation(s)
- Pierre-Andre Barbeau
- Department of Human Health & Nutritional Sciences, University of Guelph, Ontario, Canada
| | - Jacy M Houad
- Department of Human Health & Nutritional Sciences, University of Guelph, Ontario, Canada
| | - Jason S Huber
- Department of Human Health & Nutritional Sciences, University of Guelph, Ontario, Canada
| | - Sabina Paglialunga
- Department of Human Health & Nutritional Sciences, University of Guelph, Ontario, Canada
| | - Laelie A Snook
- Department of Human Health & Nutritional Sciences, University of Guelph, Ontario, Canada
| | - Eric A F Herbst
- Department of Human Health & Nutritional Sciences, University of Guelph, Ontario, Canada
| | - Kaitlyn M J H Dennis
- Department of Human Health & Nutritional Sciences, University of Guelph, Ontario, Canada
| | - Jeremy A Simpson
- Department of Human Health & Nutritional Sciences, University of Guelph, Ontario, Canada
| | - Graham P Holloway
- Department of Human Health & Nutritional Sciences, University of Guelph, Ontario, Canada
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Abstract
BACKGROUND Preoperative anaemia is common and occurs in 5% to 76% of patients preoperatively. It is associated with an increased risk of perioperative allogeneic blood transfusion, longer hospital stay, and increased morbidity and mortality. Iron deficiency is one of the most common causes of anaemia. Oral and intravenous iron therapy can be used to treat anaemia. Parenteral iron preparations have been shown to be more effective in conditions such as inflammatory bowel disease, chronic heart failure and postpartum haemorrhage due to rapid correction of iron stores. A limited number of studies has investigated iron therapy for the treatment of preoperative anaemia. The aim of this Cochrane Review is to summarise the evidence for iron supplementation, both enteral and parenteral, for the management of preoperative anaemia. OBJECTIVES To evaluate the effects of preoperative iron therapy (enteral or parenteral) in reducing the need for allogeneic blood transfusions in anaemic patients undergoing surgery. SEARCH METHODS We ran the search on 30 July 2018. We searched the Cochrane Injuries Group's Specialised Register, Cochrane Central Register of Controlled Trials (CENTRAL, the Cochrane Library), Ovid MEDLINE(R), Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations, Ovid MEDLINE(R) Daily and Ovid OLDMEDLINE(R), Embase Classic and Embase (Ovid), CINAHL Plus (EBSCO), PubMed, and clinical trials registries, and we screened reference lists. We ran a top-up search on 28 November 2019; one study is now awaiting classification. SELECTION CRITERIA We included all randomised controlled trials (RCTs) that compared preoperative iron monotherapy to placebo, no treatment, standard care or another form of iron therapy for anaemic adults undergoing surgery. We defined anaemia as haemoglobin values less than 13 g/dL for males and 12 g/dL for non-pregnant females. DATA COLLECTION AND ANALYSIS Two review authors collected data and a third review author checked all collected data. Data were collected on the proportion of patients who receive a blood transfusion, the amount of blood transfused per patient (units), quality of life, ferritin levels and haemoglobin levels, measured as continuous variables at the following predetermined time points: pretreatment (baseline), preoperatively but postintervention, and postoperatively. We performed statistical analysis using the Cochrane software, Review Manager 5. We summarised outcome data in tables and forest plots. We used the GRADE approach to describe the quality of the body of evidence. MAIN RESULTS Six RCTs, with a total of 372 participants, evaluated preoperative iron therapy to correct anaemia before planned surgery. Four studies compared iron therapy (either oral (one study) or intravenous (three studies)) with no treatment, placebo or usual care, and two studies compared intravenous iron therapy with oral iron therapy. Iron therapy was delivered over a range of periods that varied from 48 hours to three weeks prior to surgery. The 372 participants in our analysis fall far short of the 819 required - as calculated by our information size calculation - to detect a 30% reduction in blood transfusions. Five trials, involving 310 people, reported the proportion of participants who received allogeneic blood transfusions. Meta-analysis of iron therapy versus placebo or standard care showed no difference in the proportion of participants who received a blood transfusion (risk ratio (RR) 1.21, 95% confidence interval (CI) 0.87 to 1.70; 4 studies, 200 participants; moderate-quality evidence). Only one study that compared oral versus intravenous iron therapy measured this outcome, and reported no difference in risk of transfusion between groups. There was no difference between the iron therapy and placebo/standard care groups for haemoglobin level preoperatively at the end of the intervention (mean difference (MD) 0.63 g/dL, 95% CI -0.07 to 1.34; 2 studies, 83 participants; low-quality evidence). However, intravenous iron therapy produced an increase in preoperative postintervention haemoglobin levels compared with oral iron (MD 1.23 g/dL, 95% CI 0.80 to 1.65; 2 studies, 172 participants; low-quality evidence). Ferritin levels were increased by intravenous iron, both when compared to standard care ((MD 149.00, 95% CI 25.84 to 272.16; 1 study, 63 participants; low-quality evidence) or to oral iron (MD 395.03 ng/mL, 95% CI 227.72 to 562.35; 2 studies, 151 participants; low-quality evidence). Not all studies measured quality of life, short-term mortality or postoperative morbidity. Some measured the outcomes, but did not report the data, and the studies which did report the data were underpowered. Therefore, uncertainty remains regarding these outcomes. The inclusion of new research in the future is very likely to change these results. AUTHORS' CONCLUSIONS The use of iron therapy for preoperative anaemia does not show a clinically significant reduction in the proportion of trial participants who received an allogeneic blood transfusion compared to no iron therapy. Results for intravenous iron are consistent with a greater increase in haemoglobin and ferritin when compared to oral iron, but do not provide reliable evidence. These conclusions are drawn from six studies, three of which included very small numbers of participants. Further, well-designed, adequately powered, RCTs are required to determine the true effectiveness of iron therapy for preoperative anaemia. Two studies are currently in progress, and will include 1500 randomised participants.
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Affiliation(s)
- Oliver Ng
- University of NottinghamNottingham Digestive Diseases Centre and Biomedical Research UnitDerby RdNottinghamUKNG7 2UH
| | - Barrie D Keeler
- University of NottinghamNottingham Digestive Diseases Centre and Biomedical Research UnitDerby RdNottinghamUKNG7 2UH
| | - Amitabh Mishra
- University of NottinghamNottingham Digestive Diseases Centre and Biomedical Research UnitDerby RdNottinghamUKNG7 2UH
| | - J A Simpson
- University of NottinghamNottingham Digestive Diseases Centre and Biomedical Research UnitDerby RdNottinghamUKNG7 2UH
| | - Keith Neal
- University of NottinghamDepartment of Epidemiology and Public Health188 Alfreton RoadLittle EatonDerbyUKDE21 5AB
| | - Hafid Omar Al‐Hassi
- University of WolverhamptonOffice (MA112b), Wulfruna StreetWolverhamptonUKWV1 1LY
| | | | - Austin G Acheson
- University of NottinghamNottingham Digestive Diseases Centre and Biomedical Research UnitDerby RdNottinghamUKNG7 2UH
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Hughes MC, Ramos SV, Turnbull PC, Rebalka IA, Cao A, Monaco CM, Varah NE, Edgett BA, Huber JS, Tadi P, Delfinis LJ, Schlattner U, Simpson JA, Hawke TJ, Perry CG. Early myopathy in Duchenne muscular dystrophy is associated with elevated mitochondrial H 2 O 2 emission during impaired oxidative phosphorylation. J Cachexia Sarcopenia Muscle 2019; 10:643-661. [PMID: 30938481 PMCID: PMC6596403 DOI: 10.1002/jcsm.12405] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 12/13/2018] [Accepted: 01/09/2019] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Muscle wasting and weakness in Duchenne muscular dystrophy (DMD) causes severe locomotor limitations and early death due in part to respiratory muscle failure. Given that current clinical practice focuses on treating secondary complications in this genetic disease, there is a clear need to identify additional contributions in the aetiology of this myopathy for knowledge-guided therapy development. Here, we address the unresolved question of whether the complex impairments observed in DMD are linked to elevated mitochondrial H2 O2 emission in conjunction with impaired oxidative phosphorylation. This study performed a systematic evaluation of the nature and degree of mitochondrial-derived H2 O2 emission and mitochondrial oxidative dysfunction in a mouse model of DMD by designing in vitro bioenergetic assessments that attempt to mimic in vivo conditions known to be critical for the regulation of mitochondrial bioenergetics. METHODS Mitochondrial bioenergetics were compared with functional and histopathological indices of myopathy early in DMD (4 weeks) in D2.B10-DMDmdx /2J mice (D2.mdx)-a model that demonstrates severe muscle weakness. Adenosine diphosphate's (ADP's) central effect of attenuating H2 O2 emission while stimulating respiration was compared under two models of mitochondrial-cytoplasmic phosphate exchange (creatine independent and dependent) in muscles that stained positive for membrane damage (diaphragm, quadriceps, and white gastrocnemius). RESULTS Pathway-specific analyses revealed that Complex I-supported maximal H2 O2 emission was elevated concurrent with a reduced ability of ADP to attenuate emission during respiration in all three muscles (mH2 O2 : +17 to +197% in D2.mdx vs. wild type). This was associated with an impaired ability of ADP to stimulate respiration at sub-maximal and maximal kinetics (-17 to -72% in D2.mdx vs. wild type), as well as a loss of creatine-dependent mitochondrial phosphate shuttling in diaphragm and quadriceps. These changes largely occurred independent of mitochondrial density or abundance of respiratory chain complexes, except for quadriceps. This muscle was also the only one exhibiting decreased calcium retention capacity, which indicates increased sensitivity to calcium-induced permeability transition pore opening. Increased H2 O2 emission was accompanied by a compensatory increase in total glutathione, while oxidative stress markers were unchanged. Mitochondrial bioenergetic dysfunctions were associated with induction of mitochondrial-linked caspase 9, necrosis, and markers of atrophy in some muscles as well as reduced hindlimb torque and reduced respiratory muscle function. CONCLUSIONS These results provide evidence that Complex I dysfunction and loss of central respiratory control by ADP and creatine cause elevated oxidant generation during impaired oxidative phosphorylation. These dysfunctions may contribute to early stage disease pathophysiology and support the growing notion that mitochondria are a potential therapeutic target in this disease.
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Affiliation(s)
- Meghan C. Hughes
- School of Kinesiology and Health Science, Muscle Health Research Centre, 344 Norman Bethune CollegeYork UniversityTorontoONCanada
| | - Sofhia V. Ramos
- School of Kinesiology and Health Science, Muscle Health Research Centre, 344 Norman Bethune CollegeYork UniversityTorontoONCanada
| | - Patrick C. Turnbull
- School of Kinesiology and Health Science, Muscle Health Research Centre, 344 Norman Bethune CollegeYork UniversityTorontoONCanada
| | - Irena A. Rebalka
- Department of Pathology and Molecular MedicineMcMaster UniversityHamiltonONCanada
| | - Andrew Cao
- Department of Pathology and Molecular MedicineMcMaster UniversityHamiltonONCanada
| | - Cynthia M.F. Monaco
- Department of Pathology and Molecular MedicineMcMaster UniversityHamiltonONCanada
| | - Nina E. Varah
- Department of Pathology and Molecular MedicineMcMaster UniversityHamiltonONCanada
| | - Brittany A. Edgett
- Department of Human Health and Nutritional Sciences and Cardiovascular Research GroupUniversity of GuelphGuelphONCanada
| | - Jason S. Huber
- Department of Human Health and Nutritional Sciences and Cardiovascular Research GroupUniversity of GuelphGuelphONCanada
| | - Peyman Tadi
- School of Kinesiology and Health Science, Muscle Health Research Centre, 344 Norman Bethune CollegeYork UniversityTorontoONCanada
| | - Luca J. Delfinis
- School of Kinesiology and Health Science, Muscle Health Research Centre, 344 Norman Bethune CollegeYork UniversityTorontoONCanada
| | - U. Schlattner
- Laboratory of Fundamental and Applied Bioenergetics (LBFA) and SFR Environmental and Systems Biology (BEeSy)University Grenoble AlpesGrenobleFrance
| | - Jeremy A. Simpson
- Department of Human Health and Nutritional Sciences and Cardiovascular Research GroupUniversity of GuelphGuelphONCanada
| | - Thomas J. Hawke
- Department of Pathology and Molecular MedicineMcMaster UniversityHamiltonONCanada
| | - Christopher G.R. Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, 344 Norman Bethune CollegeYork UniversityTorontoONCanada
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Barbeau PA, Houad JM, Huber JS, Paglialunga S, Snook LA, Herbst EA, Chorner Z, Simpson JA, Holloway GP. Ablating The Rab-GTPase Activating Protein TBC1D1 Predisposes Rats To High Fat Diet-Induced Cardiomyopathy. Med Sci Sports Exerc 2019. [DOI: 10.1249/01.mss.0000562454.58203.4f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hughes MC, Ramos SV, Turnbull PC, Edgett BA, Huber JS, Polidovitch N, Schlattner U, Backx PH, Simpson JA, Perry CGR. Impairments in left ventricular mitochondrial bioenergetics precede overt cardiac dysfunction and remodelling in Duchenne muscular dystrophy. J Physiol 2019; 598:1377-1392. [PMID: 30674086 DOI: 10.1113/jp277306] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Accepted: 01/22/2019] [Indexed: 12/21/2022] Open
Abstract
KEY POINTS Ninety-eight per cent of patients with Duchenne muscular dystrophy (DMD) develop cardiomyopathy, with 40% developing heart failure. While increased propensity for mitochondrial induction of cell death has been observed in left ventricle, it remains unknown whether this is linked to impaired mitochondrial respiratory control and elevated H2 O2 emission prior to the onset of cardiomyopathy. Classic mouse models of DMD demonstrate hyper-regeneration in skeletal muscle which may mask mitochondrial abnormalities. Using a model with less regenerative capacity that is more akin to DMD patients, we observed elevated left ventricular mitochondrial H2 O2 and impaired oxidative phosphorylation in the absence of cardiac remodelling or overt cardiac dysfunction at 4 weeks. These impairments were associated with dysfunctions at complex I, governance by ADP and creatine-dependent phosphate shuttling, which results in a less efficient response to energy demands. Mitochondria may be a therapeutic target for the treatment of cardiomyopathy in DMD. ABSTRACT In Duchenne muscular dystrophy (DMD), mitochondrial dysfunction is predicted as a response to numerous cellular stressors, yet the contribution of mitochondria to the onset of cardiomyopathy remains unknown. To resolve this uncertainty, we designed in vitro assessments of mitochondrial bioenergetics to model mitochondrial control parameters that influence cardiac function. Both left ventricular mitochondrial responsiveness to the central bioenergetic controller ADP and the ability of creatine to facilitate mitochondrial-cytoplasmic phosphate shuttling were assessed. These measurements were performed in D2.B10-DMDmdx /2J mice - a model that demonstrates skeletal muscle atrophy and weakness due to limited regenerative capacities and cardiomyopathy more akin to people with DMD than classic models. At 4 weeks of age, there was no evidence of cardiac remodelling or cardiac dysfunction despite impairments in ADP-stimulated respiration and ADP attenuation of H2 O2 emission. These impairments were seen at both submaximal and maximal ADP concentrations despite no reductions in mitochondrial content markers. The ability of creatine to enhance ADP's control of mitochondrial bioenergetics was also impaired, suggesting an impairment in mitochondrial creatine kinase-dependent phosphate shuttling. Susceptibly to permeability transition pore opening and the subsequent activation of cell death pathways remained unchanged. Mitochondrial H2 O2 emission was elevated despite no change in markers of irreversible oxidative damage, suggesting alternative redox signalling mechanisms should be explored. These findings demonstrate that selective mitochondrial dysfunction precedes the onset of overt cardiomyopathy in D2.mdx mice, suggesting that improving mitochondrial bioenergetics by restoring ADP, creatine-dependent phosphate shuttling and complex I should be considered for treating DMD patients.
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Affiliation(s)
- Meghan C Hughes
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Sofhia V Ramos
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Patrick C Turnbull
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Brittany A Edgett
- Department of Human Health and Nutritional Sciences and Cardiovascular Research Group, University of Guelph, Guelph, ON, Canada.,Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada.,IMPART Team Canada Investigator Network, Saint John, New Brunswick, Canada
| | - Jason S Huber
- Department of Human Health and Nutritional Sciences and Cardiovascular Research Group, University of Guelph, Guelph, ON, Canada
| | - Nazari Polidovitch
- Department of Biology and the Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Uwe Schlattner
- Laboratory of Fundamental and Applied Bioenergetics (LBFA) and SFR Environmental and Systems Biology (BEeSy), University Grenoble Alpes, Grenoble, France
| | - Peter H Backx
- Department of Biology and the Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences and Cardiovascular Research Group, University of Guelph, Guelph, ON, Canada.,IMPART Team Canada Investigator Network, Saint John, New Brunswick, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, ON, Canada
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Eadie AL, Platt MJ, Titus A, London M, Simpson JA, Brunt KR. Therapeutic modulation of heme metabolism post-myocardial infarction improves cardiac remodeling, ventricular function and survival. J Mol Cell Cardiol 2018. [DOI: 10.1016/j.yjmcc.2018.07.068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ruggiero SA, Huber JS, Murrant CL, Brunt KR, Simpson JA. Splenic blood-flow response following myocardial infarction in rat. Can J Physiol Pharmacol 2018; 96:1060-1068. [PMID: 30102865 DOI: 10.1139/cjpp-2018-0134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
During physiological stress (e.g., exercise, hypoxia), blood flow is shunted to specific anatomical regions to protect critical organs; yet, splenic blood flow in these circumstances remains to be investigated. Despite being classically viewed as a non-critical organ, recent experimental and epidemiological evidence suggests the spleen plays a significant role in cardiovascular pathophysiology. We hypothesized that splenic blood flow is prioritized in the development of heart failure (i.e., chronic state of reduced cardiac output). Five-week-old male Wistar rats were randomized for either myocardial infarction (MI; n = 58) or sham (n = 56) surgery. At 2, 5, and 9 weeks post-surgery, Doppler ultrasound measurements of the splenic, left renal, left common carotid, and left femoral arteries were performed. Cardiac function was assessed at all time points using echocardiography and at 9 weeks post-surgery using invasive hemodynamic analysis. Splenic and cerebral blood flow was preferentially maintained at 9 weeks post-MI, whereas blood flow to the lower limb and kidney were reduced. Spleen size increased by 5 weeks post-MI and remained elevated. Splenic blood flow was maintained in conditions of decreased cardiac output, when other tissues showed decreased blood flow. The maintenance of blood flow in the face of decreased cardiac output indicates that splenic function is being prioritized during heart failure.
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Affiliation(s)
- Sara A Ruggiero
- a Department of Human Health and Nutritional Science, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada
| | - Jason S Huber
- a Department of Human Health and Nutritional Science, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.,b IMPART team Canada Investigator Network
| | - Coral L Murrant
- a Department of Human Health and Nutritional Science, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada
| | - Keith R Brunt
- b IMPART team Canada Investigator Network.,c Department of Pharmacology, Dalhousie Medicine New Brunswick, Dalhousie University, Saint John, NB E2K 5E2, Canada
| | - Jeremy A Simpson
- a Department of Human Health and Nutritional Science, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.,b IMPART team Canada Investigator Network
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Platt MJ, Huber JS, Romanova N, Brunt KR, Simpson JA. Pathophysiological Mapping of Experimental Heart Failure: Left and Right Ventricular Remodeling in Transverse Aortic Constriction Is Temporally, Kinetically and Structurally Distinct. Front Physiol 2018; 9:472. [PMID: 29867532 PMCID: PMC5962732 DOI: 10.3389/fphys.2018.00472] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 04/16/2018] [Indexed: 12/16/2022] Open
Abstract
A growing proportion of heart failure (HF) patients present with impairments in both ventricles. Experimental pressure-overload (i.e., transverse aortic constriction, TAC) induces left ventricle (LV) hypertrophy and failure, as well as right ventricle (RV) dysfunction. However, little is known about the coordinated progression of biventricular dysfunction that occurs in TAC. Here we investigated the time course of systolic and diastolic function in both the LV and RV concurrently to improve our understanding of the chronology of events in TAC. Hemodynamic, histological, and morphometric assessments were obtained from the LV and RV at 2, 4, 9, and 18 weeks post-surgery. Results: Systolic pressures peaked in both ventricles at 4 weeks, thereafter steadily declining in the LV, while remaining elevated in the RV. The LV and RV followed different structural and functional timelines, suggesting the patterns in one ventricle are independent from the opposing ventricle. RV hypertrophy/fibrosis and pulmonary arterial remodeling confirmed a progressive right-sided pathology. We further identified both compensation and decompensation in the LV with persistent concentric hypertrophy in both phases. Finally, diastolic impairments in both ventricles manifested as an intricate progression of multiple parameters that were not in agreement until overt systolic failure was evident. Conclusion: We establish pulmonary hypertension was secondary to LV dysfunction, confirming TAC is a model of type II pulmonary hypertension. This study also challenges some common assumptions in experimental HF (e.g., the relationship between fibrosis and filling pressure) while addressing a knowledge gap with respect to temporality of RV remodeling in pressure-overload.
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Affiliation(s)
- Mathew J. Platt
- Department of Human Health & Nutritional Sciences, University of Guelph, Guelph, ON, Canada
- IMPART Team Canada Investigator Network, Saint John, NB, Canada
| | - Jason S. Huber
- Department of Human Health & Nutritional Sciences, University of Guelph, Guelph, ON, Canada
- IMPART Team Canada Investigator Network, Saint John, NB, Canada
| | - Nadya Romanova
- Department of Human Health & Nutritional Sciences, University of Guelph, Guelph, ON, Canada
- IMPART Team Canada Investigator Network, Saint John, NB, Canada
| | - Keith R. Brunt
- IMPART Team Canada Investigator Network, Saint John, NB, Canada
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, NB, Canada
| | - Jeremy A. Simpson
- Department of Human Health & Nutritional Sciences, University of Guelph, Guelph, ON, Canada
- IMPART Team Canada Investigator Network, Saint John, NB, Canada
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38
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Allwood MA, Edgett BA, Eadie AL, Huber JS, Romanova N, Millar PJ, Brunt KR, Simpson JA. Moderate and severe hypoxia elicit divergent effects on cardiovascular function and physiological rhythms. J Physiol 2018; 596:3391-3410. [PMID: 29604069 DOI: 10.1113/jp275945] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 03/29/2018] [Indexed: 12/26/2022] Open
Abstract
KEY POINTS In the present study, we provide evidence for divergent physiological responses to moderate compared to severe hypoxia, addressing an important knowledge gap related to severity, duration and after-effects of hypoxia encountered in cardiopulmonary situations. The physiological responses to moderate and severe hypoxia were not proportional, linear or concurrent with the time-of-day. Hypoxia elicited severity-dependent physiological responses that either persisted or fluctuated throughout normoxic recovery. The physiological basis for these distinct cardiovascular responses implicates a shift in the sympathovagal set point and probably not molecular changes at the artery resulting from hypoxic stress. ABSTRACT Hypoxia is both a consequence and cause of many acute and chronic diseases. Severe hypoxia causes hypertension with cardiovascular sequelae; however, the rare studies using moderate severities of hypoxia indicate that it can be beneficial, suggesting that hypoxia may not always be detrimental. Comparisons between studies are difficult because of the varied classifications of hypoxic severities, methods of delivery and use of anaesthetics. Thus, to investigate the long-term effects of moderate hypoxia on cardiovascular health, radiotelemetry was used to obtain in vivo physiological measurements in unanaesthetized mice during 24 h of either moderate (FIO2=0.15) or severe (FIO2=0.09) hypoxia, followed by 72 h of normoxic recovery. Systolic blood pressure was decreased during recovery following moderate hypoxia but increased following severe hypoxia. Moderate and severe hypoxia increased haeme oxygenase-1 expression during recovery, suggesting parity in hypoxic stress at the level of the artery. Severe but not moderate hypoxia increased the low/high frequency ratio of heart rate variability 72 h post-hypoxia, indicating a shift in sympathovagal balance. Moderate hypoxia dampened the amplitude of circadian rhythm, whereas severe disrupted rhythm during the entire insult, with perturbations persisting throughout normoxic recovery. Thus, hypoxic severity differentially regulates circadian blood pressure.
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Affiliation(s)
- Melissa A Allwood
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada
| | - Brittany A Edgett
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada
| | - Ashley L Eadie
- Department of Pharmacology, Dalhousie Medicine New Brunswick, 100 Tucker Park Road, Saint John, New Brunswick, Canada
| | - Jason S Huber
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada
| | - Nadya Romanova
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada
| | - Philip J Millar
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie Medicine New Brunswick, 100 Tucker Park Road, Saint John, New Brunswick, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada
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Melville S, Teskey R, Philip S, Simpson JA, Lutchmedial S, Brunt KR. A Comparison and Calibration of a Wrist-Worn Blood Pressure Monitor for Patient Management: Assessing the Reliability of Innovative Blood Pressure Devices. J Med Internet Res 2018; 20:e111. [PMID: 29695375 PMCID: PMC5943631 DOI: 10.2196/jmir.8009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Revised: 11/10/2017] [Accepted: 11/16/2017] [Indexed: 01/09/2023] Open
Abstract
Background Clinical guidelines recommend monitoring of blood pressure at home using an automatic blood pressure device for the management of hypertension. Devices are not often calibrated against direct blood pressure measures, leaving health care providers and patients with less reliable information than is possible with current technology. Rigorous assessments of medical devices are necessary for establishing clinical utility. Objective The purpose of our study was 2-fold: (1) to assess the validity and perform iterative calibration of indirect blood pressure measurements by a noninvasive wrist cuff blood pressure device in direct comparison with simultaneously recorded peripheral and central intra-arterial blood pressure measurements and (2) to assess the validity of the measurements thereafter of the noninvasive wrist cuff blood pressure device in comparison with measurements by a noninvasive upper arm blood pressure device to the Canadian hypertension guidelines. Methods The cloud-based blood pressure algorithms for an oscillometric wrist cuff device were iteratively calibrated to direct pressure measures in 20 consented patient participants. We then assessed measurement validity of the device, using Bland-Altman analysis during routine cardiovascular catheterization. Results The precalibrated absolute mean difference between direct intra-arterial to wrist cuff pressure measurements were 10.8 (SD 9.7) for systolic and 16.1 (SD 6.3) for diastolic. The postcalibrated absolute mean difference was 7.2 (SD 5.1) for systolic and 4.3 (SD 3.3) for diastolic pressures. This is an improvement in accuracy of 33% systolic and 73% diastolic with a 48% reduction in the variability for both measures. Furthermore, the wrist cuff device demonstrated similar sensitivity in measuring high blood pressure compared with the direct intra-arterial method. The device, when calibrated to direct aortic pressures, demonstrated the potential to reduce a treatment gap in high blood pressure measurements. Conclusions The systolic pressure measurements of the wrist cuff have been iteratively calibrated using gold standard central (ascending aortic) pressure. This improves the accuracy of the indirect measures and potentially reduces the treatment gap. Devices that undergo auscultatory (indirect) calibration for licensing can be greatly improved by additional iterative calibration via intra-arterial (direct) measures of blood pressure. Further clinical trials with repeated use of the device over time are needed to assess the reliability of the device in accordance with current and evolving guidelines for informed decision making in the management of hypertension. Trial Registration ClinicalTrials.gov NCT03015363; https://clinicaltrials.gov/ct2/show/NCT03015363 (Archived by WebCite at http://www.webcitation.org/6xPZgseYS)
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Affiliation(s)
- Sarah Melville
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, NB, Canada.,Cardiovascular Research New Brunswick, New Brunswick Heart Centre, Saint John, NB, Canada
| | - Robert Teskey
- Cardiovascular Research New Brunswick, New Brunswick Heart Centre, Saint John, NB, Canada.,Department of Cardiology, Saint John Regional Hospital, Horizon Health Network, Saint John, NB, Canada
| | - Shona Philip
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, NB, Canada.,Cardiovascular Research New Brunswick, New Brunswick Heart Centre, Saint John, NB, Canada
| | - Jeremy A Simpson
- Department of Human Health Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Sohrab Lutchmedial
- Cardiovascular Research New Brunswick, New Brunswick Heart Centre, Saint John, NB, Canada.,Department of Cardiology, Saint John Regional Hospital, Horizon Health Network, Saint John, NB, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, NB, Canada.,Cardiovascular Research New Brunswick, New Brunswick Heart Centre, Saint John, NB, Canada.,Department of Cardiology, Saint John Regional Hospital, Horizon Health Network, Saint John, NB, Canada
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40
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Platt MJ, Huber JS, Brunt KR, Simpson JA. Pulmonary Flow as an Improved Method for Determining Cardiac Output in Mice after Myocardial Infarction. J Am Soc Echocardiogr 2018; 30:612-623.e1. [PMID: 28528655 DOI: 10.1016/j.echo.2017.02.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Indexed: 11/25/2022]
Abstract
BACKGROUND Echocardiography is a valuable noninvasive technique to estimate cardiac output (CO) from the left ventricle (LV) not only in clinical practice but also in small-animal experiments. CO is used to grade cardiac function and is especially important when investigating cardiac injury (e.g., myocardial infarction [MI]). Critically, MI deforms the LV, invalidating the assumptions fundamental to calculating of cardiac volumes directly from the LV. Thus, the purpose of this study was to determine if Doppler-derived blood flow through the pulmonary trunk (pulmonary flow [PF]) was an improved method over conventional LV-dependent echocardiography to accurately determine CO after MI. METHODS Variations in CO were induced either by transverse aortic constriction or MI. Echocardiography was performed in healthy (n = 27), transverse aortic constriction (n = 25), and MI (n = 41) mice. CO calculated from PF (pulsed-wave Doppler) was internally compared with CO calculated from left ventricular images using M-mode (Teichholz formula) and the single-plane ellipsoid two-dimensional (2D) formula and externally compared with the gold standard, flow probe CO. RESULTS In healthy mice, all three echocardiographic methods (M-mode, 2D, and PF) correlated well with flow probe-derived CO. In MI mice, only PF CO values correlated well with flow probe values. Bland-Altman analysis confirmed that PF was improved over M-mode and 2D echocardiography. Inter- and intrauser variability of PF CO was reduced, and both inter- and intraclass correlation coefficients were improved compared with either M-mode or 2D CO calculations. CONCLUSIONS PF CO calculated from pulsed-wave Doppler through the pulmonary trunk was an improved method of estimating CO over LV-dependent formulas after MI.
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Affiliation(s)
- Mathew J Platt
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Jason S Huber
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie Medicine, New Brunswick, Saint John, New Brunswick, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.
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41
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Monaco CMF, Miotto PM, Huber JS, van Loon LJC, Simpson JA, Holloway GP. Sodium nitrate supplementation alters mitochondrial H 2O 2 emission but does not improve mitochondrial oxidative metabolism in the heart of healthy rats. Am J Physiol Regul Integr Comp Physiol 2018. [PMID: 29513565 DOI: 10.1152/ajpregu.00275.2017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Supplementation with dietary inorganic nitrate ([Formula: see text]) is increasingly recognized to confer cardioprotective effects in both healthy and clinical populations. While the mechanism(s) remains ambiguous, in skeletal muscle oral consumption of NaNO3 has been shown to improve mitochondrial efficiency. Whether NaNO3 has similar effects on mitochondria within the heart is unknown. Therefore, we comprehensively investigated the effect of NaNO3 supplementation on in vivo left ventricular (LV) function and mitochondrial bioenergetics. Healthy male Sprague-Dawley rats were supplemented with NaNO3 (1 g/l) in their drinking water for 7 days. Echocardiography and invasive hemodynamics were used to assess LV morphology and function. Blood pressure (BP) was measured by tail-cuff and invasive hemodynamics. Mitochondrial bioenergetics were measured in LV isolated mitochondria and permeabilized muscle fibers by high-resolution respirometry and fluorometry. Nitrate decreased ( P < 0.05) BP, LV end-diastolic pressure, and maximal LV pressure. Rates of LV relaxation (when normalized to mean arterial pressure) tended ( P = 0.13) to be higher with nitrate supplementation. However, nitrate did not alter LV mitochondrial respiration, coupling efficiency, or oxygen affinity in isolated mitochondria or permeabilized muscle fibers. In contrast, nitrate increased ( P < 0.05) the propensity for mitochondrial H2O2 emission in the absence of changes in cellular redox state and decreased the sensitivity of mitochondria to ADP (apparent Km). These results add to the therapeutic potential of nitrate supplementation in cardiovascular diseases and suggest that nitrate may confer these beneficial effects via mitochondrial redox signaling.
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Affiliation(s)
- Cynthia M F Monaco
- Department of Human Health and Nutritional Sciences, University of Guelph , Guelph, Ontario , Canada
| | - Paula M Miotto
- Department of Human Health and Nutritional Sciences, University of Guelph , Guelph, Ontario , Canada
| | - Jason S Huber
- Department of Human Health and Nutritional Sciences, University of Guelph , Guelph, Ontario , Canada
| | - Luc J C van Loon
- Department of Human Movement Sciences, Nutrition, and Toxicology, Research Institute Maastricht (NUTRIM), Maastricht University , Maastricht , The Netherlands
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph , Guelph, Ontario , Canada
| | - Graham P Holloway
- Department of Human Health and Nutritional Sciences, University of Guelph , Guelph, Ontario , Canada
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42
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Foster AJ, Platt MJ, Huber JS, Eadie AL, Arkell AM, Romanova N, Wright DC, Gillis TE, Murrant CL, Brunt KR, Simpson JA. Central-acting therapeutics alleviate respiratory weakness caused by heart failure-induced ventilatory overdrive. Sci Transl Med 2018; 9:9/390/eaag1303. [PMID: 28515334 DOI: 10.1126/scitranslmed.aag1303] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 03/13/2017] [Indexed: 12/22/2022]
Abstract
Diaphragmatic weakness is a feature of heart failure (HF) associated with dyspnea and exertional fatigue. Most studies have focused on advanced stages of HF, leaving the cause unresolved. The long-standing theory is that pulmonary edema imposes a mechanical stress, resulting in diaphragmatic remodeling, but stable HF patients rarely exhibit pulmonary edema. We investigated how diaphragmatic weakness develops in two mouse models of pressure overload-induced HF. As in HF patients, both models had increased eupneic respiratory pressures and ventilatory drive. Despite the absence of pulmonary edema, diaphragmatic strength progressively declined during pressure overload; this decline correlated with a reduction in diaphragm cross-sectional area and preceded evidence of muscle weakness. We uncovered a functional codependence between angiotensin II and β-adrenergic (β-ADR) signaling, which increased ventilatory drive. Chronic overdrive was associated with increased PERK (double-stranded RNA-activated protein kinase R-like ER kinase) expression and phosphorylation of EIF2α (eukaryotic translation initiation factor 2α), which inhibits protein synthesis. Inhibition of β-ADR signaling after application of pressure overload normalized diaphragm strength, Perk expression, EIF2α phosphorylation, and diaphragmatic cross-sectional area. Only drugs that were able to penetrate the blood-brain barrier were effective in treating ventilatory overdrive and preventing diaphragmatic atrophy. These data provide insight into why similar drugs have different benefits on mortality and symptomatology, despite comparable cardiovascular effects.
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Affiliation(s)
- Andrew J Foster
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Mathew J Platt
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Jason S Huber
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Ashley L Eadie
- Department of Pharmacology, Dalhousie Medicine, Saint John, New Brunswick E2L 4L5, Canada
| | - Alicia M Arkell
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Nadya Romanova
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - David C Wright
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Todd E Gillis
- Department of Integrative Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Coral L Murrant
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie Medicine, Saint John, New Brunswick E2L 4L5, Canada.
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
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Derendinger B, de Vos M, Nathavitharana RR, Dolby T, Simpson JA, van Helden PD, Warren RM, Theron G. Widespread use of incorrect PCR ramp rate negatively impacts multidrug-resistant tuberculosis diagnosis (MTBDRplus). Sci Rep 2018; 8:3206. [PMID: 29453405 PMCID: PMC5816666 DOI: 10.1038/s41598-018-21458-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Accepted: 02/06/2018] [Indexed: 11/09/2022] Open
Abstract
The scale-up of rapid drug resistance testing for TB is a global priority. MTBDRplus is a WHO-endorsed multidrug-resistant (MDR)-TB PCR assay with suboptimal sensitivities and high indeterminate rates on smear-negative specimens. We hypothesised that widespread use of incorrect thermocycler ramp rate (speed of temperature change between cycles) impacts performance. A global sample of 72 laboratories was surveyed. We tested 107 sputa from Xpert MTB/RIF-positive patients and, separately, dilution series of bacilli, both at the manufacturer-recommended ramp rate (2.2 °C/s) and the most frequently reported incorrect ramp rate (4.0 °C/s). Mycobacterium tuberculosis-complex DNA (TUB-band)-detection, indeterminate results, accuracy, and inter-reader variability (dilution series only) were compared. 32 respondents did a median (IQR) of 41 (20-150) assays monthly. 78% used an incorrect ramp rate. On smear-negative sputa, 2.2 °C/s vs. 4.0 °C/s improved TUB-band positivity (42/55 vs. 32/55; p = 0.042) and indeterminate rates (1/42 vs. 5/32; p = 0.039). The actionable results (not TUB-negative or indeterminate; 41/55 vs. 28/55) hence improved by 21% (95% CI: 9-35%). Widespread use of incorrect ramp rate contributes to suboptimal MTBDRplus performance on smear-negative specimens and hence limits clinical utility. The number of diagnoses (and thus the number of smear-negative patients in whom DST is possible) will improve substantially after ramp rate correction.
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Affiliation(s)
- B Derendinger
- DST/NRF Centre of Excellence for Biomedical Tuberculosis Research, SA MRC Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - M de Vos
- DST/NRF Centre of Excellence for Biomedical Tuberculosis Research, SA MRC Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - R R Nathavitharana
- Division of Infectious Diseases, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA
| | - T Dolby
- National Health Laboratory Services, Cape Town, South Africa
| | - J A Simpson
- National Health Laboratory Services, Cape Town, South Africa
| | - P D van Helden
- DST/NRF Centre of Excellence for Biomedical Tuberculosis Research, SA MRC Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - R M Warren
- DST/NRF Centre of Excellence for Biomedical Tuberculosis Research, SA MRC Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - G Theron
- DST/NRF Centre of Excellence for Biomedical Tuberculosis Research, SA MRC Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.
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44
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Mistry N, Mazer CD, Sled JG, Lazarus AH, Cahill LS, Solish M, Zhou YQ, Romanova N, Hare AGM, Doctor A, Fisher JA, Brunt KR, Simpson JA, Hare GMT. Red blood cell antibody-induced anemia causes differential degrees of tissue hypoxia in kidney and brain. Am J Physiol Regul Integr Comp Physiol 2018; 314:R611-R622. [PMID: 29351418 DOI: 10.1152/ajpregu.00182.2017] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Moderate anemia is associated with increased mortality and morbidity, including acute kidney injury (AKI), in surgical patients. A red blood cell (RBC)-specific antibody model was utilized to determine whether moderate subacute anemia could result in tissue hypoxia as a potential mechanism of injury. Cardiovascular and hypoxic cellular responses were measured in transgenic mice capable of expressing hypoxia-inducible factor-1α (HIF-1α)/luciferase activity in vivo. Antibody-mediated anemia was associated with mild intravascular hemolysis (6 h) and splenic RBC sequestration ( day 4), resulting in a nadir hemoglobin concentration of 89 ± 13 g/l on day 4. At this time point, renal tissue oxygen tension (PtO2) was decreased in anemic mice relative to controls (13.1 ± 4.3 vs. 20.8 ± 3.7 mmHg, P < 0.001). Renal tissue hypoxia was associated with an increase in HIF/luciferase expression in vivo ( P = 0.04) and a 20-fold relative increase in renal erythropoietin mRNA transcription ( P < 0.001) but no increase in renal blood flow ( P = 0.67). By contrast, brain PtO2 was maintained in anemic mice relative to controls (22.7 ± 5.2 vs. 23.4 ± 9.8 mmHg, P = 0.59) in part because of an increase in internal carotid artery blood flow (80%, P < 0.001) and preserved cerebrovascular reactivity. Despite these adaptive changes, an increase in brain HIF-dependent mRNA levels was observed (erythropoietin: P < 0.001; heme oxygenase-1: P = 0.01), providing evidence for subtle cerebral tissue hypoxia in anemic mice. These data demonstrate that moderate subacute anemia causes significant renal tissue hypoxia, whereas adaptive cerebrovascular responses limit the degree of cerebral tissue hypoxia. Further studies are required to assess whether hypoxia is a mechanism for acute kidney injury associated with anemia.
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Affiliation(s)
- Nikhil Mistry
- Department of Anesthesia, St. Michael's Hospital, University of Toronto , Toronto, Ontario , Canada.,Department of Physiology, University of Toronto , Toronto, Ontario , Canada
| | - C David Mazer
- Department of Anesthesia, St. Michael's Hospital, University of Toronto , Toronto, Ontario , Canada.,Department of Physiology, University of Toronto , Toronto, Ontario , Canada.,Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute, St. Michael's Hospital , Toronto, Ontario , Canada
| | - John G Sled
- Mouse Imaging Centre, The Hospital for Sick Children , Toronto, Ontario , Canada.,Department of Medical Biophysics, University of Toronto , Toronto, Ontario , Canada
| | - Alan H Lazarus
- Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute, St. Michael's Hospital , Toronto, Ontario , Canada.,Canadian Blood Services Centre for Innovation , Ottawa, Ontario , Canada
| | - Lindsay S Cahill
- Mouse Imaging Centre, The Hospital for Sick Children , Toronto, Ontario , Canada
| | - Max Solish
- Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute, St. Michael's Hospital , Toronto, Ontario , Canada
| | - Yu-Qing Zhou
- Mouse Imaging Centre, The Hospital for Sick Children , Toronto, Ontario , Canada
| | - Nadya Romanova
- Department of Human Health and Nutritional Sciences and Cardiovascular Research Group, University of Guelph , Guelph, Ontario , Canada
| | - Alexander G M Hare
- Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute, St. Michael's Hospital , Toronto, Ontario , Canada
| | - Allan Doctor
- Department of Pediatrics, Department of Biochemistry and Molecular Biophysics, Washington University in St. Louis , St. Louis, Missouri
| | - Joseph A Fisher
- Department of Physiology, University of Toronto , Toronto, Ontario , Canada.,Department of Anesthesia, Toronto General Hospital, University of Toronto , Toronto, Ontario , Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie University , Saint John, New Brunswick , Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences and Cardiovascular Research Group, University of Guelph , Guelph, Ontario , Canada
| | - Gregory M T Hare
- Department of Anesthesia, St. Michael's Hospital, University of Toronto , Toronto, Ontario , Canada.,Department of Physiology, University of Toronto , Toronto, Ontario , Canada.,Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute, St. Michael's Hospital , Toronto, Ontario , Canada.,St. Michael's Hospital Center of Excellence in Patient Blood Management, University of Toronto, Toronto, Ontario, Canada
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Ng O, Keeler BD, Simpson JA, Al-Hassi HO, Acheson AG, Brookes MJ. PTU-113 Hepcidin does not predict response to iron therapy in pre-operative anaemia in patients with colorectal cancer. Nutrition 2017. [DOI: 10.1136/gutjnl-2017-314472.208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Paglialunga S, Simnett G, Robson H, Hoang M, Pillai R, Arkell AM, Simpson JA, Bonen A, Huising M, Joseph JW, Holloway GP. The Rab-GTPase activating protein, TBC1D1, is critical for maintaining normal glucose homeostasis and β-cell mass. Appl Physiol Nutr Metab 2017; 42:647-655. [DOI: 10.1139/apnm-2016-0585] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Tre-2/USP6, BUB2, cdc16 domain family, member 1 (TBC1D1), a Rab-GTPase activating protein, is a paralogue of AS160, and has been implicated in the canonical insulin-signaling cascade in peripheral tissues. More recently, TBC1D1 was identified in rat and human pancreatic islets; however, the islet function of TBC1D1 remains not fully understood. We examined the role of TBC1D1 in glucose homeostasis and insulin secretion utilizing a rat knockout (KO) model. Chow-fed TBC1D1 KO rats had improved insulin action but impaired glucose-tolerance tests (GTT) and a lower insulin response during an intraperitoneal GTT compared with wild-type (WT) rats. The in vivo data suggest there may be an islet defect. Glucose-stimulated insulin secretion was higher in isolated KO rat islets compared with WT animals, suggesting TBC1D1 is a negative regulator of insulin secretion. Moreover, KO rats displayed reduced β-cell mass, which likely accounts for the impaired whole-body glucose homeostasis. This β-cell mass reduction was associated with increased active caspase 3, and unaltered Ki67 or urocortin 3, suggesting the induction of apoptosis rather than decreased proliferation or dedifferentiation may account for the decline in islet mass. A similar phenotype was observed in TBC1D1 heterozygous animals, highlighting the sensitivity of the pancreas to subtle reductions in TBC1D1 protein. An 8-week pair-fed high-fat diet did not further alter β-cell mass or apoptosis in KO rats, suggesting that dietary lipids per se, do not lead to a further impairment in glucose homeostasis. The present study establishes a fundamental role for TBC1D1 in maintaining in vivo β-cell mass.
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Affiliation(s)
- Sabina Paglialunga
- Department of Human Health & Nutritional Sciences, University of Guelph, 50 Stone Rd. East, Guelph, ON N1G 2W1, Canada
- School of Pharmacy, University of Waterloo, 10A Victoria Street South, Kitchener, ON N2G 1C5, Canada
| | - Genevieve Simnett
- Department of Human Health & Nutritional Sciences, University of Guelph, 50 Stone Rd. East, Guelph, ON N1G 2W1, Canada
| | - Holly Robson
- Department of Human Health & Nutritional Sciences, University of Guelph, 50 Stone Rd. East, Guelph, ON N1G 2W1, Canada
| | - Monica Hoang
- School of Pharmacy, University of Waterloo, 10A Victoria Street South, Kitchener, ON N2G 1C5, Canada
| | - Renjitha Pillai
- School of Pharmacy, University of Waterloo, 10A Victoria Street South, Kitchener, ON N2G 1C5, Canada
| | - Alicia M. Arkell
- Department of Human Health & Nutritional Sciences, University of Guelph, 50 Stone Rd. East, Guelph, ON N1G 2W1, Canada
| | - Jeremy A. Simpson
- Department of Human Health & Nutritional Sciences, University of Guelph, 50 Stone Rd. East, Guelph, ON N1G 2W1, Canada
| | - Arend Bonen
- Department of Human Health & Nutritional Sciences, University of Guelph, 50 Stone Rd. East, Guelph, ON N1G 2W1, Canada
| | - Mark Huising
- Department of Neurobiology, Physiology & Behavior, College of Biological Sciences & Department of Physiology & Membrane Biology, School of Medicine, University of California, Davis, California, USA
| | - Jamie W. Joseph
- School of Pharmacy, University of Waterloo, 10A Victoria Street South, Kitchener, ON N2G 1C5, Canada
| | - Graham P. Holloway
- Department of Human Health & Nutritional Sciences, University of Guelph, 50 Stone Rd. East, Guelph, ON N1G 2W1, Canada
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Keeler BD, Simpson JA, Ng O, Padmanabhan H, Brookes MJ, Acheson AG. Randomized clinical trial of preoperative oral versus intravenous iron in anaemic patients with colorectal cancer. Br J Surg 2017; 104:214-221. [PMID: 28092401 DOI: 10.1002/bjs.10328] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 06/01/2016] [Accepted: 08/24/2016] [Indexed: 12/21/2022]
Abstract
BACKGROUND Treatment of preoperative anaemia is recommended as part of patient blood management, aiming to minimize perioperative allogeneic red blood cell transfusion. No clear evidence exists outlining which treatment modality should be used in patients with colorectal cancer. The study aimed to compare the efficacy of preoperative intravenous and oral iron in reducing blood transfusion use in anaemic patients undergoing elective colorectal cancer surgery. METHODS Anaemic patients with non-metastatic colorectal adenocarcinoma were recruited at least 2 weeks before surgery and randomized to receive oral (ferrous sulphate) or intravenous (ferric carboxymaltose) iron. Perioperative changes in haemoglobin, ferritin, transferrin saturation and blood transfusion use were recorded until postoperative outpatient review. RESULTS Some 116 patients were included in the study. There was no difference in blood transfusion use from recruitment to trial completion in terms of either volume of blood administered (P = 0·841) or number of patients transfused (P = 0·470). Despite this, increases in haemoglobin after treatment were higher with intravenous iron (median 1·55 (i.q.r. 0·93-2·58) versus 0·50 (-0·13 to 1·33) g/dl; P < 0·001), which was associated with fewer anaemic patients at the time of surgery (75 versus 90 per cent; P = 0·048). Haemoglobin levels were thus higher at surgery after treatment with intravenous than with oral iron (mean 11·9 (95 per cent c.i. 11·5 to 12·3) versus 11·0 (10·6 to 11·4) g/dl respectively; P = 0·002), as were ferritin (P < 0·001) and transferrin saturation (P < 0·001) levels. CONCLUSION Intravenous iron did not reduce the blood transfusion requirement but was more effective than oral iron at treating preoperative anaemia and iron deficiency in patients undergoing colorectal cancer surgery.
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Affiliation(s)
- B D Keeler
- National Institute for Health Research Biomedical Research Unit in Gastrointestinal and Liver Diseases at Nottingham University Hospitals NHS Trust, University of Nottingham, Nottingham, UK.,Department of Colorectal Surgery, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - J A Simpson
- National Institute for Health Research Biomedical Research Unit in Gastrointestinal and Liver Diseases at Nottingham University Hospitals NHS Trust, University of Nottingham, Nottingham, UK.,Department of Colorectal Surgery, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - O Ng
- National Institute for Health Research Biomedical Research Unit in Gastrointestinal and Liver Diseases at Nottingham University Hospitals NHS Trust, University of Nottingham, Nottingham, UK.,Department of Colorectal Surgery, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - H Padmanabhan
- School of Cancer Sciences, University of Birmingham, Birmingham, UK.,Department of Gastroenterology, Royal Wolverhampton NHS Trust, Wolverhampton, UK
| | - M J Brookes
- School of Cancer Sciences, University of Birmingham, Birmingham, UK.,Department of Gastroenterology, Royal Wolverhampton NHS Trust, Wolverhampton, UK
| | - A G Acheson
- National Institute for Health Research Biomedical Research Unit in Gastrointestinal and Liver Diseases at Nottingham University Hospitals NHS Trust, University of Nottingham, Nottingham, UK.,Department of Colorectal Surgery, Nottingham University Hospitals NHS Trust, Nottingham, UK
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Affiliation(s)
- J A Simpson
- Institute of Neurological Sciences, Southern General Hospital, Glasgow
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Aitken Z, Simpson JA, Bentley R, Kavanagh AM. OP61 The effect of disability acquisition in adulthood on mental health: is the effect modified by demographic and socioeconomic factors? Br J Soc Med 2016. [DOI: 10.1136/jech-2016-208064.61] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Macpherson REK, Huber JS, Frendo-Cumbo S, Simpson JA, Wright DC. Adipose Tissue Insulin Action and IL-6 Signaling after Exercise in Obese Mice. Med Sci Sports Exerc 2016; 47:2034-42. [PMID: 25785928 DOI: 10.1249/mss.0000000000000660] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
INTRODUCTION Adipose tissue insulin action is impaired in obesity and is associated with inflammation, macrophage infiltration, and polarization toward a proinflammatory phenotype. Acute exercise can reduce markers of adipose inflammation, including interleukin (IL) 6, in parallel with improvements in insulin action; however, others have provided evidence that IL-6 has anti-inflammatory properties. PURPOSE This study aimed to examine the relation between IL-6 signaling, macrophage infiltration, and polarization and insulin action in inguinal fat after acute exercise in obese, insulin-resistant mice. METHODS Male C57BL/6 mice were fed a low-fat diet (10% kcal lard) or a high-fat diet (HFD, 60% kcal lard) for 7 wk and then underwent an acute bout of exercise (2-h treadmill running: 15 m·min, 5% incline). RESULTS The HFD resulted in increased body mass, glucose intolerance, and attenuated insulin-induced AKT Thr308 phosphorylation in inguinal fat. This was accompanied by increases in indices of macrophage infiltration (F4/80, CD68, and monocyte chemoattractant protein-1 expression) and polarization toward an M1 phenotype (increased expression of CD11c, CD11c/galactose-type C-type lectin 1, and inducible nitric oxide synthase). Immunofluorescence imaging demonstrated increased F4/80- and CD11c-positive cells with the HFD. Two hours after exercise, the insulin-induced activation of AKT Th308 phosphorylation was recovered in HFD mice. This was accompanied by an upregulation of IL-6 and IL-10 signaling, as demonstrated by increased expression of IL-6, IL-10, and SOCS3 as well as STAT3 phosphorylation. Furthermore, acute exercise resulted in a shift toward reduction in M1 polarization indicated by a decrease in the ratio of CD11c to galactose-type C-type lectin 1 mRNA as well as a decline in F4/80- and CD11c-positive cells. CONCLUSIONS The results suggest a link between exercise-induced increases in IL-6, reductions in indices of M1 macrophages, and increased IL-10, a reputed anti-inflammatory cytokine with insulin-sensitizing properties.
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Affiliation(s)
- Rebecca E K Macpherson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, CANADA
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