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Rouleau M, Villeneuve L, Allain EP, McCabe-Leroux J, Tremblay S, Nguyen Van Long F, Uchil A, Joly-Beauparlant C, Droit A, Guillemette C. Non-canonical transcriptional regulation of the poor prognostic factor UGT2B17 in chronic lymphocytic leukemic and normal B cells. BMC Cancer 2024; 24:410. [PMID: 38566115 PMCID: PMC10985967 DOI: 10.1186/s12885-024-12143-7] [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: 08/22/2023] [Accepted: 03/19/2024] [Indexed: 04/04/2024] Open
Abstract
BACKGROUND High expression of the glycosyltransferase UGT2B17 represents an independent adverse prognostic marker in chronic lymphocytic leukemia (CLL). It also constitutes a predictive marker for therapeutic response and a drug resistance mechanism. The key determinants driving expression of the UGT2B17 gene in normal and leukemic B-cells remain undefined. The UGT2B17 transcriptome is complex and is comprised of at least 10 alternative transcripts, identified by previous RNA-sequencing of liver and intestine. We hypothesized that the transcriptional program regulating UGT2B17 in B-lymphocytes is distinct from the canonical expression previously characterized in the liver. RESULTS RNA-sequencing and genomics data revealed a specific genomic landscape at the UGT2B17 locus in normal and leukemic B-cells. RNA-sequencing and quantitative PCR data indicated that the UGT2B17 enzyme is solely encoded by alternative transcripts expressed in CLL patient cells and not by the canonical transcript widely expressed in the liver and intestine. Chromatin accessible regions (ATAC-Seq) in CLL cells mapped with alternative promoters and non-coding exons, which may be derived from endogenous retrotransposon elements. By luciferase reporter assays, we identified key cis-regulatory STAT3, RELA and interferon regulatory factor (IRF) binding sequences driving the expression of UGT2B17 in lymphoblastoid and leukemic B-cells. Electrophoretic mobility shift assays and pharmacological inhibition demonstrated key roles for the CLL prosurvival transcription factors STAT3 and NF-κB in the leukemic expression of UGT2B17. CONCLUSIONS UGT2B17 expression in B-CLL is driven by key regulators of CLL progression. Our data suggest that a NF-κB/STAT3/IRF/UGT2B17 axis may represent a novel B-cell pathway promoting disease progression and drug resistance.
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Affiliation(s)
- Michèle Rouleau
- Faculty of Pharmacy, Centre Hospitalier Universitaire de Québec Research Center - Université Laval (CRCHUQc- UL), Université Laval, Québec, QC, Canada
- Cancer research center of Université Laval, Québec, Canada
| | - Lyne Villeneuve
- Faculty of Pharmacy, Centre Hospitalier Universitaire de Québec Research Center - Université Laval (CRCHUQc- UL), Université Laval, Québec, QC, Canada
- Cancer research center of Université Laval, Québec, Canada
| | - Eric P Allain
- Molecular Genetics Laboratory, Vitalité Health Network, Dr. Georges-L.-Dumont University Hospital Center, Moncton, NB, Canada
| | - Jules McCabe-Leroux
- Faculty of Pharmacy, Centre Hospitalier Universitaire de Québec Research Center - Université Laval (CRCHUQc- UL), Université Laval, Québec, QC, Canada
- Cancer research center of Université Laval, Québec, Canada
| | - Sophie Tremblay
- Faculty of Pharmacy, Centre Hospitalier Universitaire de Québec Research Center - Université Laval (CRCHUQc- UL), Université Laval, Québec, QC, Canada
- Cancer research center of Université Laval, Québec, Canada
| | - Flora Nguyen Van Long
- Faculty of Pharmacy, Centre Hospitalier Universitaire de Québec Research Center - Université Laval (CRCHUQc- UL), Université Laval, Québec, QC, Canada
- Cancer research center of Université Laval, Québec, Canada
| | - Ashwini Uchil
- Faculty of Pharmacy, Centre Hospitalier Universitaire de Québec Research Center - Université Laval (CRCHUQc- UL), Université Laval, Québec, QC, Canada
- Cancer research center of Université Laval, Québec, Canada
| | - Charles Joly-Beauparlant
- Cancer research center of Université Laval, Québec, Canada
- CRCHUQc-UL and Faculty of Medicine, Université Laval, Québec, Québec, Canada
| | - Arnaud Droit
- Cancer research center of Université Laval, Québec, Canada
- CRCHUQc-UL and Faculty of Medicine, Université Laval, Québec, Québec, Canada
| | - Chantal Guillemette
- Faculty of Pharmacy, Centre Hospitalier Universitaire de Québec Research Center - Université Laval (CRCHUQc- UL), Université Laval, Québec, QC, Canada.
- Cancer research center of Université Laval, Québec, Canada.
- Canada Research Chair in Pharmacogenomics, Faculty of Pharmacy, Université Laval, Québec, QC, Canada.
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Cervera SB, Saeed S, Luu TM, Gorgos A, Beltempo M, Claveau M, Basso O, Lapointe A, Tremblay S, Altit G. Evaluation of the association between patent ductus arteriosus approach and neurodevelopment in extremely preterm infants. J Perinatol 2024; 44:388-395. [PMID: 38278962 DOI: 10.1038/s41372-024-01877-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 12/28/2023] [Accepted: 01/05/2024] [Indexed: 01/28/2024]
Abstract
OBJECTIVE Assess if unit-level PDA management correlates with neurodevelopmental impairment (NDI) at 18-24 months corrected postnatal age (CPA) in extremely preterm infants. STUDY DESIGN Retrospective analysis of infants born at <29 weeks (2014-2017) across two units having distinct PDA strategies. Site 1 utilized an echocardiography-based treatment strategy aiming for accelerated closure (control). Site 2 followed a conservative approach. PRIMARY ENDPOINT NDI, characterized by cerebral palsy, any Bayley-III composite score <85, sensorineural/mixed hearing loss, or at least unilateral visual impairment. RESULTS 377 infants were evaluated. PDA treatment rates remained unchanged in Site 1 but eventually reached 0% in Site 2. Comparable rates of any/significant NDI were seen across both sites (any NDI: 38% vs 36%; significant NDI: 13% vs 10% for Site 1 and 2, respectively). After adjustments, NDI rates remained similar. CONCLUSION PDA management strategies in extremely preterm newborns showed no significant impact on neurodevelopment outcomes at 18-24 months CPA.
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Affiliation(s)
- Soledad Belén Cervera
- Division of Neonatology, Department of Paediatrics, Sainte-Justine University Health Center, Montréal, QC, Canada
| | - Sahar Saeed
- Department of Public Health Sciences, Queen's University, Kingston, ON, Canada
| | - Thuy Mai Luu
- Neonatal Follow-Up, Department of Paediatrics, Université de Montréal, Montreal, QC, Canada
| | - Andrea Gorgos
- Neonatal Follow-Up, Department of Pediatrics, McGill University, Montreal, QC, Canada
| | - Marc Beltempo
- Division of Neonatology, Department of Pediatrics, McGill University, Montreal, QC, Canada
| | - Martine Claveau
- Division of Neonatology, Department of Pediatrics, McGill University, Montreal, QC, Canada
| | - Olga Basso
- Department of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, QC, Canada
| | - Anie Lapointe
- Division of Neonatology, Department of Paediatrics, Sainte-Justine University Health Center, Montréal, QC, Canada
| | - Sophie Tremblay
- Division of Neonatology, Department of Paediatrics, Sainte-Justine University Health Center, Montréal, QC, Canada
| | - Gabriel Altit
- Division of Neonatology, Department of Paediatrics, Sainte-Justine University Health Center, Montréal, QC, Canada.
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3
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Morin C, Simard É, See W, Sage M, Imane R, Nadeau C, Samson N, Lavoie PM, Chabot B, Marouan S, Tremblay S, Praud JP, Micheau P, Fortin-Pellerin É. Total liquid ventilation in an ovine model of extreme prematurity: a randomized study. Pediatr Res 2024; 95:974-980. [PMID: 37833531 DOI: 10.1038/s41390-023-02841-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 08/16/2023] [Accepted: 09/26/2023] [Indexed: 10/15/2023]
Abstract
BACKGROUND This study aimed at comparing cardiorespiratory stability during total liquid ventilation (TLV)-prior to lung aeration-with conventional mechanical ventilation (CMV) in extremely preterm lambs during the first 6 h of life. METHODS 23 lambs (11 females) were born by c-section at 118-120 days of gestational age (term = 147 days) to receive 6 h of TLV or CMV from birth. Lung samples were collected for RNA and histology analyses. RESULTS The lambs under TLV had higher and more stable arterial oxygen saturation (p = 0.001) and cerebral tissue oxygenation (p = 0.02) than the lambs in the CMV group in the first 10 min of transition to extrauterine life. Although histological assessment of the lungs was similar between the groups, a significant upregulation of IL-1a, IL-6 and IL-8 RNA in the lungs was observed after TLV. CONCLUSIONS Total liquid ventilation allowed for remarkably stable transition to extrauterine life in an extremely preterm lamb model. Refinement of our TLV prototype and ventilation algorithms is underway to address specific challenges in this population, such as minimizing tracheal deformation during the active expiration. IMPACT Total liquid ventilation allows for remarkably stable transition to extrauterine life in an extremely preterm lamb model. Total liquid ventilation is systematically achievable over the first 6 h of life in the extremely premature lamb model. This study provides additional incentive to pursue further investigation of total liquid ventilation as a transition tool for the most extreme preterm neonates.
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Affiliation(s)
- Christophe Morin
- Department of Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Émile Simard
- Department of Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Wendy See
- Department of Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Michaël Sage
- Department of Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Roqaya Imane
- Department of Pediatrics, Université de Montréal, Montreal, QC, Canada
| | - Charlène Nadeau
- Department of Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Nathalie Samson
- Department of Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Pascal M Lavoie
- Division of Neonatology, Department of Pediatrics, University of British Columbia, Vancouver, BC, Canada
| | - Benoît Chabot
- Department of Microbiology and Infectiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Sofia Marouan
- Department of Pathology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Sophie Tremblay
- Department of Pediatrics, Université de Montréal, Montreal, QC, Canada
| | - Jean-Paul Praud
- Department of Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
- Department of Pediatrics, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Philippe Micheau
- Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Étienne Fortin-Pellerin
- Department of Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada.
- Department of Pediatrics, Université de Sherbrooke, Sherbrooke, QC, Canada.
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Dion PM, Lapierre M, Said H, Tremblay S, Tariq K, Lamb T, English SW, Kingstone M, Stratton A, Boet S, Shorr R, Lampron J. Rethinking cervical spine clearance in obtunded trauma patients: An updated systematic review and meta-analysis. Injury 2024; 55:111308. [PMID: 38266326 DOI: 10.1016/j.injury.2023.111308] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 12/23/2023] [Accepted: 12/29/2023] [Indexed: 01/26/2024]
Abstract
BACKGROUND Cervical spine injuries (CSI) are often challenging to diagnose in obtunded adult patients with blunt trauma and the optimal imaging modality remains uncertain. This study systematically synthesized the last decade of evidence to determine the type of imaging required to clear the c-spine in obtunded patients with blunt trauma. METHODS A systematic review with meta-analysis was conducted and reported using PRISMA 2020 guidelines. The protocol was registered on June 22, 2022 (PROSPERO CRD42022341386). MEDLINE (Ovid), EMBASE, and Cochrane Library were searched for studies published between January 1, 2012, and October 17, 2023. Studies comparing CT alone to CT combined with MRI for c-spine clearance were included. Two independent reviewers screened articles for eligibility in duplicate. Meta-analysis was conducted using a random-effect model. Risk of bias and quality assessment were performed using the ROBINS-I and QUADAS-2. The certainty of evidence was assessed using the GRADE methodology. RESULTS 744 obtunded trauma patients from six included studies were included. Among the 584 that had a negative CT scan, the pooled missed rate of clinically significant CSI using CT scans alone was 6 % (95 % CI: 0.02 to 0.17), and the pooled missed rate of CSI requiring treatment was 7 % (95 % CI: 0.02 to 0.18). High heterogeneity was observed among included studies (I² > 84 %). The overall risk of bias was moderate, and the quality of evidence was low due to the retrospective nature of the included studies and high heterogeneity. CONCLUSIONS Limited evidence published in the last decade found that CT scans alone may not be sufficient for detecting clinically significant CSI and injuries requiring treatment in obtunded adult patients with blunt trauma. IMPLICATIONS OF KEY FINDINGS Clinicians should be aware of the limitations of CT scans and consider using MRI when appropriate. Future research should focus on prospective studies with standardized outcome measures and uniform reporting.
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Affiliation(s)
- Pierre-Marc Dion
- Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada; Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | | | - Hussein Said
- Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Sophie Tremblay
- Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Khadeeja Tariq
- Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Tyler Lamb
- Division of General Surgery, Department of Surgery, The Ottawa Hospital, University of Ottawa, Ottawa, ON, Canada
| | - Shane W English
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada; Department of Medicine (Critical Care), The Ottawa Hospital, University of Ottawa, Ottawa, ON, Canada
| | - Michael Kingstone
- Department of Medical Imaging, The Ottawa Hospital, Ottawa, ON, Canada
| | - Alexandra Stratton
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada; Division of Orthopedic Surgery, Department of Surgery, The Ottawa Hospital, University of Ottawa, Ottawa, ON, Canada
| | - Sylvain Boet
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada; Department of Anesthesiology and Pain Medicine, The Ottawa Hospital, University of Ottawa, Ottawa, ON, Canada; Department of Innovation in Medical Education, University of Ottawa, Ottawa, ON, Canada; Institut du Savoir Montfort, Ottawa, ON, Canada
| | - Risa Shorr
- Library Services, The Ottawa Hospital, Ottawa, ON, Canada
| | - Jacinthe Lampron
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada; Division of General Surgery, Department of Surgery, The Ottawa Hospital, University of Ottawa, Ottawa, ON, Canada.
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5
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Wagner A, Rouleau M, Villeneuve L, Le T, Peltier C, Allain ÉP, Beaudoin C, Tremblay S, Courtier F, Nguyen Van Long F, Laverdière I, Lévesque É, Banerji V, Vanura K, Guillemette C. A Non-Canonical Role for the Glycosyltransferase Enzyme UGT2B17 as a Novel Constituent of the B Cell Receptor Signalosome. Cells 2023; 12:cells12091295. [PMID: 37174695 PMCID: PMC10177405 DOI: 10.3390/cells12091295] [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: 03/28/2023] [Revised: 04/21/2023] [Accepted: 04/28/2023] [Indexed: 05/15/2023] Open
Abstract
In chronic lymphocytic leukemia (CLL), an elevated glycosyltransferase UGT2B17 expression (UGT2B17HI) identifies a subgroup of patients with shorter survival and poor drug response. We uncovered a mechanism, possibly independent of its enzymatic function, characterized by an enhanced expression and signaling of the proximal effectors of the pro-survival B cell receptor (BCR) pathway and elevated Bruton tyrosine kinase (BTK) phosphorylation in B-CLL cells from UGT2B17HI patients. A prominent feature of B-CLL cells is the strong correlation of UGT2B17 expression with the adverse marker ZAP70 encoding a tyrosine kinase that promotes B-CLL cell survival. Their combined high expression levels in the treatment of naïve patients further defined a prognostic group with the highest risk of poor survival. In leukemic cells, UGT2B17 knockout and repression of ZAP70 reduced proliferation, suggesting that the function of UGT2B17 might involve ZAP70. Mechanistically, UGT2B17 interacted with several kinases of the BCR pathway, including ZAP70, SYK, and BTK, revealing a potential therapeutic vulnerability. The dual SYK and JAK/STAT6 inhibitor cerdulatinib most effectively compromised the proliferative advantage conferred by UGT2B17 compared to the selective BTK inhibitor ibrutinib. Findings point to an oncogenic role for UGT2B17 as a novel constituent of BCR signalosome also connected with microenvironmental signaling.
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Affiliation(s)
- Antoine Wagner
- Centre Hospitalier Universitaire de Québec Research Center-Université Laval (CRCHUQc-UL), Faculty of Pharmacy, and Centre de Recherche sur le Cancer de l'Université Laval (CRC-UL), Université Laval, Québec, QC G1V 4G2, Canada
| | - Michèle Rouleau
- Centre Hospitalier Universitaire de Québec Research Center-Université Laval (CRCHUQc-UL), Faculty of Pharmacy, and Centre de Recherche sur le Cancer de l'Université Laval (CRC-UL), Université Laval, Québec, QC G1V 4G2, Canada
| | - Lyne Villeneuve
- Centre Hospitalier Universitaire de Québec Research Center-Université Laval (CRCHUQc-UL), Faculty of Pharmacy, and Centre de Recherche sur le Cancer de l'Université Laval (CRC-UL), Université Laval, Québec, QC G1V 4G2, Canada
| | - Trang Le
- Department of Medicine I, Division of Haematology and Haemostaseology, Medical University of Vienna, 1090 Vienna, Austria
| | - Cheryl Peltier
- Department of Internal Medicine & Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3E 3P4, Canada
- CancerCare Manitoba Research Institute, Cancer Care Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Éric P Allain
- Molecular Genetics Laboratory, Dr. Georges-L-Dumont University Hospital Center, Moncton, NB E1C 2Z3, Canada
| | - Caroline Beaudoin
- Centre Hospitalier Universitaire de Québec Research Center-Université Laval (CRCHUQc-UL), Faculty of Pharmacy, and Centre de Recherche sur le Cancer de l'Université Laval (CRC-UL), Université Laval, Québec, QC G1V 4G2, Canada
| | - Sophie Tremblay
- Centre Hospitalier Universitaire de Québec Research Center-Université Laval (CRCHUQc-UL), Faculty of Pharmacy, and Centre de Recherche sur le Cancer de l'Université Laval (CRC-UL), Université Laval, Québec, QC G1V 4G2, Canada
| | - Fréderic Courtier
- Centre Hospitalier Universitaire de Québec Research Center-Université Laval (CRCHUQc-UL), Faculty of Pharmacy, and Centre de Recherche sur le Cancer de l'Université Laval (CRC-UL), Université Laval, Québec, QC G1V 4G2, Canada
| | - Flora Nguyen Van Long
- Centre Hospitalier Universitaire de Québec Research Center-Université Laval (CRCHUQc-UL), Faculty of Pharmacy, and Centre de Recherche sur le Cancer de l'Université Laval (CRC-UL), Université Laval, Québec, QC G1V 4G2, Canada
| | - Isabelle Laverdière
- Centre Hospitalier Universitaire de Québec Research Center-Université Laval (CRCHUQc-UL), Faculty of Pharmacy, and Centre de Recherche sur le Cancer de l'Université Laval (CRC-UL), Université Laval, Québec, QC G1V 4G2, Canada
| | - Éric Lévesque
- CRCHUQc-UL, Faculty of Medicine, and CRC-UL, Université Laval, Québec, QC G1V 4G2, Canada
| | - Versha Banerji
- Department of Internal Medicine & Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3E 3P4, Canada
- CancerCare Manitoba Research Institute, Cancer Care Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Katrina Vanura
- Department of Medicine I, Division of Haematology and Haemostaseology, Medical University of Vienna, 1090 Vienna, Austria
| | - Chantal Guillemette
- Centre Hospitalier Universitaire de Québec Research Center-Université Laval (CRCHUQc-UL), Faculty of Pharmacy, and Centre de Recherche sur le Cancer de l'Université Laval (CRC-UL), Université Laval, Québec, QC G1V 4G2, Canada
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Laval N, Paquette M, Talsmat H, Marandyuk B, Wintermark P, Pinchefsky E, Tremblay S. Exposure to maternal diabetes during pregnancy is associated with aggravated short-term neonatal and neurological outcomes following perinatal hypoxic-ischemic encephalopathy. Am J Perinatol 2023. [PMID: 36918161 DOI: 10.1055/a-2053-7904] [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] [Indexed: 03/16/2023]
Abstract
BACKGROUND Infants of diabetic mothers are at higher risk of perinatal morbidities and glycemic instability, but the impact of maternal diabetes on neonatal and neurological short-term outcomes of neonates with hypoxic-ischemic encephalopathy (HIE) remains poorly described. OBJECTIVES To determine the impact of maternal diabetes on neonatal and neurological short-term outcomes following neonatal HIE. METHODS A retrospective single-center study including 102 term neonates with HIE who received therapeutic hypothermia (TH) treatment between 2013 and 2020. Multiple regression analysis was used to assess the relationship between the presence of maternal diabetes and short-term outcomes. RESULTS Neonates with HIE and maternal diabetes exposure had a significantly lower gestational age at birth (38.6 vs 39.7 weeks of gestation, **P=0.005) and a significantly higher mean birth weight (3588752 vs 3214514 g, *P=0.012). Infants of diabetic mother (IDM) with HIE were ventilated longer (8 days vs. 4 days, **P=0.0047) and had a longer neonatal intensive care unit (NICU) stay (18 days vs. 11 days, *P=0.0483) as well as longer time to reach full oral feed (15 days vs. 7 days, *P=0.0432) compared to neonates of non-diabetic mother. Maternal diabetes was also associated with increased risk of death or abnormal neurological examination at discharge in neonates with HIE (OR 6,41 [1.54-26,32]). CONCLUSION In neonates with HIE, maternal diabetes is associated with an increased risk of death or short-term neonatal morbidities, such as longer duration of ventilation, prolonged neonatal stay, greater need for tube feeding and being discharged with an abnormal neurological examination. Strategies to prevent, reduce or better control maternal diabetes during pregnancy should be prioritized to minimize complications after perinatal asphyxia.
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Affiliation(s)
- Nancy Laval
- Neonatology, CHU Sainte-Justine, Montreal, Canada
| | | | - Hamza Talsmat
- Research Center, CHU Sainte-Justine Centre de Recherche, Montreal, Canada
| | - Bohdana Marandyuk
- Research Center, CHU Sainte-Justine Centre de Recherche, Montreal, Canada
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7
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Mahdi Z, Marandyuk B, Desnous B, Liet AS, Chowdhury RA, Birca V, Décarie JC, Tremblay S, Lodygensky GA, Birca A, Pinchefsky EF, Dehaes M. Opioid analgesia and temperature regulation are associated with EEG background activity and MRI outcomes in neonates with mild-to-moderate hypoxic-ischemic encephalopathy undergoing therapeutic hypothermia. Eur J Paediatr Neurol 2022; 39:11-18. [PMID: 35598572 DOI: 10.1016/j.ejpn.2022.04.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 09/17/2021] [Revised: 02/23/2022] [Accepted: 04/09/2022] [Indexed: 11/17/2022]
Abstract
BACKGROUND Therapeutic hypothermia (TH) without sedation may lead to discomfort, which may be associated with adverse consequences in neonates with hypoxic-ischemic encephalopathy (HIE). The aim of this study was to assess the association between level of exposure to opioids and temperature, with electroencephalography (EEG) background activity post-TH and magnetic resonance imaging (MRI) brain injury in neonates with HIE. METHODS Thirty-one neonates with mild-to-moderate HIE who underwent TH were identified. MRIs were reviewed for presence of brain injury. Quantitative EEG background features including EEG discontinuity index and spectral power densities were calculated during rewarming and post-rewarming periods. Dose of opioids administered during TH and temperatures were collected from the medical charts. Multivariable linear and logistic regression analyses were conducted to assess the associations between cumulative dose of opioids and temperature with EEG background and MRI while adjusting for markers of HIE severity. RESULTS Higher opioid doses (β = -0.21, p = 0.02) and reduced skin temperature (β = 0.14, p < 0.01) were associated with lower EEG discontinuity index recorded post-TH. Higher opioid doses (β = 0.75, p = 0.01) and reduced skin temperature (β = -0.39, p = 0.02) were also associated with higher EEG Delta power post-TH. MRI brain injury was observed in 14 patients (45%). In adjusted regression analyses, higher opioid doses (OR = 0.00; 95%CI: 0-0.19; p = 0.01), reduced skin temperature (OR = 41.19; 95%CI: 2.27-747.86; p = 0.01) and reduced cooling device output temperature (OR = 1.91; 95%CI: 1.05-3.48; p = 0.04) showed an association with lower odds of brain injury. CONCLUSIONS Higher level of exposure to opioids and reduced skin temperature during TH in mild-to-moderate HIE were associated with improved EEG background activity post-TH. Moreover, higher exposure to opioids, reduced skin temperature and reduced device output temperature were associated with lower odds of brain injury on MRI.
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Affiliation(s)
- Zamzam Mahdi
- Research Centre, Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada
| | - Bohdana Marandyuk
- Research Centre, Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada
| | - Beatrice Desnous
- Research Centre, Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada; Division of Neurology, Department of Neuroscience, University of Montreal and Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Monteal, QC, H3T 1C5, Canada
| | - Anne-Sophie Liet
- Research Centre, Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada
| | - Rasheda Arman Chowdhury
- Research Centre, Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada; Institute of Biomedical Engineering, University of Montreal, 2900 Edouard Montpetit Blvd, Montreal, QC, H3T 1A4, Canada
| | - Veronica Birca
- Research Centre, Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada
| | - Jean-Claude Décarie
- Department of Radiology, Radio-oncology and Nuclear Medicine, University of Montreal, 2900 Edouard Montpetit Blvd, Montreal, QC, H3T 1A4, Canada
| | - Sophie Tremblay
- Research Centre, Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada; Division of Neonatology, Department of Pediatrics, University of Montreal and Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada
| | - Gregory Anton Lodygensky
- Research Centre, Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada; Division of Neonatology, Department of Pediatrics, University of Montreal and Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada
| | - Ala Birca
- Research Centre, Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada; Division of Neurology, Department of Neuroscience, University of Montreal and Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Monteal, QC, H3T 1C5, Canada
| | - Elana F Pinchefsky
- Research Centre, Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada; Division of Neurology, Department of Neuroscience, University of Montreal and Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Monteal, QC, H3T 1C5, Canada
| | - Mathieu Dehaes
- Research Centre, Sainte-Justine University Hospital Center, 3175 Chemin de la Cote-Sainte-Catherine, Montreal, QC, H3T 1C5, Canada; Institute of Biomedical Engineering, University of Montreal, 2900 Edouard Montpetit Blvd, Montreal, QC, H3T 1A4, Canada; Department of Radiology, Radio-oncology and Nuclear Medicine, University of Montreal, 2900 Edouard Montpetit Blvd, Montreal, QC, H3T 1A4, Canada.
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8
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Nault S, Creuze V, Al-Omar S, Levasseur A, Nadeau C, Samson N, Imane R, Tremblay S, Carrault G, Pladys P, Praud JP. Cardiorespiratory Alterations in a Newborn Ovine Model of Systemic Inflammation Induced by Lipopolysaccharide Injection. Front Physiol 2020; 11:585. [PMID: 32625107 PMCID: PMC7311791 DOI: 10.3389/fphys.2020.00585] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 05/11/2020] [Indexed: 12/14/2022] Open
Abstract
Although it is well known that neonatal sepsis can induce important alterations in cardiorespiratory control, their detailed early features and the mechanisms involved remain poorly understood. As a first step in resolving this issue, the main goal of this study was to characterize these alterations more extensively by setting up a full-term newborn lamb model of systemic inflammation using lipopolysaccharide (LPS) injection. Two 6-h polysomnographic recordings were performed on two consecutive days on eight full-term lambs: the first after an IV saline injection (control condition, CTRL); the second, after an IV injection of 2.5 μg/kg Escherichia coli LPS 0127:B8 (LPS condition). Rectal temperature, locomotor activity, state of alertness, arterial blood gases, respiratory frequency and heart rate, mean arterial blood pressure, apneas and cardiac decelerations, and heart-rate and respiratory-rate variability (HRV and RRV) were assessed. LPS injection decreased locomotor activity (p = 0.03) and active wakefulness (p = 0.01) compared to the CTRL. In addition, LPS injection led to a biphasic increase in rectal temperature (p = 0.01 at ∼30 and 180 min) and in respiratory frequency and heart rate (p = 0.0005 and 0.005, respectively), and to an increase in cardiac decelerations (p = 0.05). An overall decrease in HRV and RRV was also observed. Interestingly, the novel analysis of the representations of the horizontal and vertical visibility network yielded the most statistically significant alterations in HRV structure, suggesting its potential clinical importance for providing an earlier diagnosis of neonatal bacterial sepsis. A second goal was to assess whether the reflexivity of the autonomic nervous system was altered after LPS injection by studying the cardiorespiratory components of the laryngeal and pulmonary chemoreflexes. No difference was found. Lastly, preliminary results provide proof of principle that brainstem inflammation (increased IL-8 and TNF-α mRNA expression) can be shown 6 h after LPS injection. In conclusion, this full-term lamb model of systemic inflammation reproduces several important aspects of neonatal bacterial sepsis and paves the way for studies in preterm lambs aiming to assess both the effect of prematurity and the central neural mechanisms of cardiorespiratory control alterations observed during neonatal sepsis.
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Affiliation(s)
- Stéphanie Nault
- Neonatal Respiratory Research Unit, Departments of Pediatrics and Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | | | - Sally Al-Omar
- Neonatal Respiratory Research Unit, Departments of Pediatrics and Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Annabelle Levasseur
- Neonatal Respiratory Research Unit, Departments of Pediatrics and Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Charlène Nadeau
- Neonatal Respiratory Research Unit, Departments of Pediatrics and Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Nathalie Samson
- Neonatal Respiratory Research Unit, Departments of Pediatrics and Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Roqaya Imane
- CHU Sainte-Justine Research Center, Departments of Neurosciences and Pediatrics, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada
| | - Sophie Tremblay
- CHU Sainte-Justine Research Center, Departments of Neurosciences and Pediatrics, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada
| | - Guy Carrault
- Inserm, LTSI - UMR 1099, CHU Rennes, Université Rennes 1, Rennes, France
| | - Patrick Pladys
- Inserm, LTSI - UMR 1099, CHU Rennes, Université Rennes 1, Rennes, France
| | - Jean-Paul Praud
- Neonatal Respiratory Research Unit, Departments of Pediatrics and Pharmacology-Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
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9
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Tremblay S, Girard R, Noll C, Carpentier A, Boudreau F. A267 ROLE OF INTESTINAL EPITHELIAL NUCLEAR RECEPTOR HNF4A DURING METABOLIC DISORDERS. J Can Assoc Gastroenterol 2020. [DOI: 10.1093/jcag/gwz047.266] [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] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
HNF4α belongs to the hormone nuclear receptor family and is expressed in liver, intestinal epithelium and pancreas where it regulates genes involved in the control of metabolism. Inactivating mutations in the HNF4A gene cause several forms of maturity-onset diabetes of the young (MODY). However, the specific deletion of Hnf4a in mouse pancreatic beta cells does not lead to diabetes, suggesting the contribution of other tissues, such as the intestine, are necessary for the progression of the disease.
Aims
Our main hypothesis was that intestinal epithelial HNF4α regulates gene products that act through a paracrine mode of communication in the context of glucose metabolism. The aims of this study were to investigate the impact of deleting Hnf4a in the mouse intestinal epithelium during glucose homeostasis and to identify molecular mechanisms involved during glucose-induced obesity resistance.
Methods
The Villin-Cre recombinase transgenic mouse model was used to conditionally delete Hnf4a in the intestinal epithelium (Hnf4adeltaIEC). Hnf4adeltaIEC mice were put on a high sugar diet for 8 to 12 weeks, using a 30% sucrose supplemented ab lithium water. Blood glucose values in controls and mutants were measured from whole venous blood from fasted mice or during glucose and insulin tolerance tests. Mouse serum hormone levels (Ghrelin, Fibroblast-growth factor-15 (Fgf15), Insulin, Cholecystokinin (CCK), etc.) were measured using mouse ELISA kits. The Promethion High-Definition Room Calorimetry System was used for indirect calorimetry and metabolic studies.
Results
Both male and female Hnf4adeltaIEC mice displayed a metabolic resistance to develop obesity under sucrose supplementation when compared to control mice. While male mutant mice showed a resistance to obesity after only 2 weeks of treatment, female mutant mice took at least 6 weeks to display some resistance. The gut hormones ghrelin and Fgf15 were also found modified in fasted mutant mice. Female mutant mice presented a significant increase of 1.8 fold in circulating Fgf15 and an increase of 1.4 fold in circulating ghrelin. Similar changes were observed in male mutant mice. However, only male mutant mice presented an insulin resistance and an oral glucose tolerance after between 6 and 8 weeks. Brown adipose tissue (BAT) whitening was observed after 8 weeks of sucrose treatment in control obese animals, a condition that was prevented in Hnf4adeltaIEC mice.
Conclusions
The identification of paracrine intestinal targets for HNF4α in association with glucose metabolism will provide a better understanding of the molecular nature of tissues crosstalk in energy balance and in metabolism disorders including diabetes and obesity.
Funding Agencies
CIHR
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Affiliation(s)
- S Tremblay
- Université of Sherbrooke, Sherbrooke, QC, Canada
| | - R Girard
- Université of Sherbrooke, Sherbrooke, QC, Canada
| | - C Noll
- Université of Sherbrooke, Sherbrooke, QC, Canada
| | - A Carpentier
- Université of Sherbrooke, Sherbrooke, QC, Canada
| | - F Boudreau
- Université of Sherbrooke, Sherbrooke, QC, Canada
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10
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Woodle E, Tremblay S, Brailey P, Girnita A, Alloway R, Aronow B, Dasgupta N, Ebstein F, Kloetzel P, Lee M, Kim K, Singh H, Driscoll J. Proteasomal adaptations underlying carfilzomib-resistance in human bone marrow plasma cells. Am J Transplant 2020; 20:399-410. [PMID: 31595669 PMCID: PMC6984988 DOI: 10.1111/ajt.15634] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 09/15/2019] [Accepted: 09/15/2019] [Indexed: 01/25/2023]
Abstract
Donor-specific antibodies (DSAs) have a deleterious effect on allografts and remain a major immunologic barrier in transplantation. Current therapies to eliminate DSAs are ineffective in highly HLA-sensitized patients. Proteasome inhibitors have been employed as a strategy to target bone marrow plasma cells (BMPCs), the source of long-term antibody production; however, their efficacy has been limited by poorly defined drug-resistance mechanisms. Here, we performed transcriptomic profiling of CD138+ BMPCs that survived in vivo desensitization therapy with the proteasome inhibitor carfilzomib to identify mechanisms of drug resistance. The results revealed a genomic signature that included increased expression of the immunoproteasome, a highly specialized proteasomal variant. Western blotting and functional studies demonstrated that catalytically active immunoproteasomes and the immunoproteasome activator PA28 were upregulated in carfilzomib-resistant BMPCs. Carfilzomib-resistant BMPCs displayed reduced sensitivity to the proteasome inhibitors carfilzomib, bortezomib, and ixazomib, but enhanced sensitivity to an immunoproteasome-specific inhibitor ONX-0914. Finally, in vitro carfilzomib treatment of BMPCs from HLA-sensitized patients increased levels of the immunoproteasome β5i (PSMB8) catalytic subunit suggesting that carfilzomib therapy directly induces an adaptive immunoproteasome response. Taken together, our results indicate that carfilzomib induces structural changes in proteasomes and immunoproteasome formation.
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Affiliation(s)
- E.S. Woodle
- Division of Transplantation, Department of Surgery, Cincinnati, OH, 45267, USA,Corresponding authors: E. Steve Woodle, MD; James J. Driscoll, MD, PhD; driscojs@ UCMAIL.UC.EDU
| | - S. Tremblay
- Division of Transplantation, Department of Surgery, Cincinnati, OH, 45267, USA,Department of Environmental Health, Division of Epidemiology, Cincinnati, OH, 45229, USA
| | - P. Brailey
- Hoxworth Blood Center, Transplant Immunology Division, Cincinnati, OH, 45229, USA
| | - A. Girnita
- Division of Transplantation, Department of Surgery, Cincinnati, OH, 45267, USA,Hoxworth Blood Center, Transplant Immunology Division, Cincinnati, OH, 45229, USA
| | - R.R. Alloway
- Division of Transplantation, Department of Surgery, Cincinnati, OH, 45267, USA
| | - B. Aronow
- Department of Biomedical Informatics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - N. Dasgupta
- Department of Biomedical Informatics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - F. Ebstein
- Institute for Biochemistry, Charité - University Medicine Berlin, Berlin, Germany
| | - P.M. Kloetzel
- Institute for Biochemistry, Charité - University Medicine Berlin, Berlin, Germany
| | - M.J. Lee
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY, 40536, USA
| | - K.B. Kim
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY, 40536, USA
| | - H. Singh
- Division of Immunobiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - J.J. Driscoll
- Department of Internal Medicine, Division of Hematology and Oncology, Cincinnati, OH, 45267, USA,University of Cincinnati Cancer Institute, Cincinnati, OH, 45267, USA,Corresponding authors: E. Steve Woodle, MD; James J. Driscoll, MD, PhD; driscojs@ UCMAIL.UC.EDU
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11
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Ranger M, Tremblay S, Chau CMY, Holsti L, Grunau RE, Goldowitz D. Adverse Behavioral Changes in Adult Mice Following Neonatal Repeated Exposure to Pain and Sucrose. Front Psychol 2019; 9:2394. [PMID: 30719013 PMCID: PMC6348336 DOI: 10.3389/fpsyg.2018.02394] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 11/13/2018] [Indexed: 01/08/2023] Open
Abstract
Sucrose is recommended for the treatment of pain during minor procedures in preterm infants in the neonatal intensive care unit (NICU) and is currently used worldwide as the standard of care. We recently reported that adult mice repetitively exposed to sucrose compared to water during the first week of life, irrespective of exposure to an intervention, had significantly smaller brain volumes in large white matter, cortical and subcortical structures (e.g., hippocampus, striatum, fimbria). These structures are important for stress regulation and memory formation. Here, we report the effects of repeated neonatal exposure to pain and sucrose on adult behavior in mice. Neonatal C57BL/6J mice (N = 160, 47% male) were randomly assigned to one of two treatments (sucrose, water) and one of three interventions (needle-prick, tactile, handling). Pups received 10 interventions daily from postnatal day 1 (P1) to P6. A single dose of 24% sucrose or water was given orally 2 min before each intervention. At adulthood (P60-85) mice underwent behavioral testing to assess spatial memory, anxiety, motor function, pain sensitivity, and sugar preference. We found that mice that had received sucrose and handling only, had poorer short-term memory in adulthood compared to water/handling controls (p < 0.05). When exposed to pain, mice treated with repetitive sucrose or water did not differ on memory performance (p = 0.1). A sugar preference test showed that adult mice that received sucrose before an intervention as pups consumed less sugar solution compared to controls or those that received water before pain (p < 0.05). There were no significant group differences in anxiety, motor, or pain sensitivity. In a mouse model that closely mimics NICU care, we show for the first time that memory in adulthood was poorer for mice exposed to pain during the first week of life, irrespective of sucrose treatment, suggesting that sucrose does not protect memory performance when administered for pain. In the absence of pain, early repetitive sucrose exposure induced poorer short-term memory, highlighting the importance of accurate pain assessment.
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Affiliation(s)
- Manon Ranger
- School of Nursing, The University of British Columbia, Vancouver, BC, Canada.,BC Children's Hospital Research Institute, Vancouver, BC, Canada
| | - Sophie Tremblay
- BC Children's Hospital Research Institute, Vancouver, BC, Canada.,CHU Ste-Justine Research Centre, Montreal, QC, Canada.,Centre for Molecular Medicine and Therapeutics, Vancouver, BC, Canada
| | - Cecil M Y Chau
- BC Children's Hospital Research Institute, Vancouver, BC, Canada
| | - Liisa Holsti
- BC Children's Hospital Research Institute, Vancouver, BC, Canada.,Department of Occupational Science and Occupational Therapy, The University of British Columbia, Vancouver, BC, Canada
| | - Ruth E Grunau
- BC Children's Hospital Research Institute, Vancouver, BC, Canada.,Department of Pediatrics, The University of British Columbia, Vancouver, BC, Canada
| | - Daniel Goldowitz
- BC Children's Hospital Research Institute, Vancouver, BC, Canada.,Centre for Molecular Medicine and Therapeutics, Vancouver, BC, Canada
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12
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Malo J, Martin B, Fortin G, Morin C, Brochet M, Tremblay S, Codsi E, Ferreira E. Antenatal Baclofen Exposure–Is a Prophylactic Neonatal Treatment Necessary? Reprod Toxicol 2018. [DOI: 10.1016/j.reprotox.2018.07.052] [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: 10/28/2022]
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13
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Chiolero A, Tremblay S, Delmas P, Scherrer F, Wuerzner G, Burnier M, Santschi V. Interprofessional education in hypertension: foundation for a team-based care culture. Eur J Public Health 2017. [DOI: 10.1093/eurpub/ckx189.209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- A Chiolero
- Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland
| | - S Tremblay
- Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland
| | - P Delmas
- La Source, School of Nursing Sciences, Lausanne, Switzerland
| | - F Scherrer
- La Source, School of Nursing Sciences, Lausanne, Switzerland
| | - G Wuerzner
- Lausanne University Hospital, Lausanne, Switzerland
| | - M Burnier
- Lausanne University Hospital, Lausanne, Switzerland
| | - V Santschi
- La Source, School of Nursing Sciences, Lausanne, Switzerland
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14
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Farley St-Amand B, DTrottier E, Autmizguine J, Tremblay S, Vincent M, Chevalier I, Gouin S. THE EFFICACY OF HIGH DOSE CEPHALEXIN IN THE OUTPATIENT MANAGEMENT OF MODERATE CELLULITIS FOR PEDIATRIC PATIENTS. Paediatr Child Health 2017. [DOI: 10.1093/pch/pxx086.086] [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: 11/13/2022] Open
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15
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Bussieres JF, Héraut MK, Duong MT, Elchebly C, Yu WT, Kleiber N, Lebel D, Metras ME, Tremblay S. PATIENT ACCESS TO COMPOUNDED DRUGS IN PEDIATRICS AFTER DISCHARGE FROM A TERTIARY CENTER. Paediatr Child Health 2017. [DOI: 10.1093/pch/pxx086.075] [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: 11/14/2022] Open
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16
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Tremblay S, Nigro V, Woodle ES, Alloway RR. Reply to "Fluctuation Does Not Mean Variability: A Pharmacokinetic Point of View". Am J Transplant 2017; 17:1693. [PMID: 28248455 DOI: 10.1111/ajt.14248] [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: 01/25/2023]
Affiliation(s)
- S Tremblay
- Division of Transplantation, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, OH
| | - V Nigro
- Veloxis Pharmaceuticals Inc., Edison, NJ
| | - E S Woodle
- Division of Transplantation, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, OH
| | - R R Alloway
- Division of Nephrology, Department of Internal Medicine, Kidney C.A.R.E Program, University of Cincinnati College of Medicine, Cincinnati, OH
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17
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Dhahri W, Dussault S, Haddad P, Turgeon J, Tremblay S, Rolland K, Desjarlais M, Cáceres-Gorriti KY, Mathieu R, Rivard A. Reduced expression of let-7f activates TGF-β/ALK5 pathway and leads to impaired ischaemia-induced neovascularization after cigarette smoke exposure. J Cell Mol Med 2017; 21:2211-2222. [PMID: 28345812 PMCID: PMC5571564 DOI: 10.1111/jcmm.13144] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [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: 09/25/2016] [Accepted: 01/30/2017] [Indexed: 12/20/2022] Open
Abstract
This study sought to determine the potential role of microRNAs (miRNAs) in the detrimental effects of cigarette smoke on angiogenesis and neovascularization. Using large-scale miRNA profiling and qRT-PCR analyses, we identified let-7f as a pro-angiogenic miRNA which expression is significantly reduced in HUVECs treated with cigarette smoke extracts (CSE), and in the ischemic muscles of mice that are exposed to cigarette smoke (MES). In a mouse model of hindlimb ischaemia, intramuscular injection of let-7f mimic restored ischaemia-induced neovascularization in MES. Doppler flow ratios and capillary density in ischemic muscles were significantly improved in MES treated with let-7f mimic. Clinically, this was associated with reduced ambulatory impairment and hindlimb ischaemic damage. Treatment with let-7f mimic could also rescue pro-angiogenic cell (PAC) number and function (attachment, proliferation, migration) in MES. ALK5 (TGF-βR1), an important modulator of angiogenesis, is a target of let-7f. Here we show that ALK5 is increased in HUVECs exposed to CSE and in the ischaemic muscles of MES. This is associated with a downstream activation of the anti-angiogenic factors SMAD2/3 and PAI-1. Importantly, treatment with let-7f mimic reduces the expression of ALK5, SMAD2/3 and PAI-1 both in vitro and in vivo. Moreover, let-7f overexpression or ALK5 inhibition can rescue angiogenesis in HUVECs exposed to CSE. Cigarette smoke exposure is associated with reduced expression of let-7f and activation of the anti-angiogenic TGF-β/ALK5 pathway. Overexpression of let-7f using a miRNA mimic could constitute a novel therapeutic strategy to improve ischaemia-induced neovascularization in pathological conditions.
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Affiliation(s)
- Wahiba Dhahri
- Department of Cardiovascular Research, Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada
| | - Sylvie Dussault
- Department of Cardiovascular Research, Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada
| | - Paola Haddad
- Department of Cardiovascular Research, Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada
| | - Julie Turgeon
- Department of Cardiovascular Research, Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada
| | - Sophie Tremblay
- Department of Cardiovascular Research, Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada
| | - Kevin Rolland
- Department of Cardiovascular Research, Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada
| | - Michel Desjarlais
- Department of Cardiovascular Research, Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada
| | - Katia Y Cáceres-Gorriti
- Department of Cardiovascular Research, Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada
| | - Raphael Mathieu
- Department of Cardiovascular Research, Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada
| | - Alain Rivard
- Department of Cardiovascular Research, Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada
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Hannah R, Tremblay S, Rocchi L, Rothwell J. Dependence of short-interval intracortical inhibition on conditioning pulse duration. Brain Stimul 2017. [DOI: 10.1016/j.brs.2017.01.382] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Hannah R, Cavanagh S, Tremblay S, Simeoni S, Rothwell J. P159 Specific and non-specific inhibition of interneurons circuits during motor preparation and suppression. Clin Neurophysiol 2017. [DOI: 10.1016/j.clinph.2016.10.280] [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: 10/20/2022]
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20
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Tremblay S, Nigro V, Weinberg J, Woodle ES, Alloway RR. A Steady-State Head-to-Head Pharmacokinetic Comparison of All FK-506 (Tacrolimus) Formulations (ASTCOFF): An Open-Label, Prospective, Randomized, Two-Arm, Three-Period Crossover Study. Am J Transplant 2017; 17:432-442. [PMID: 27340950 PMCID: PMC5297985 DOI: 10.1111/ajt.13935] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [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: 04/06/2016] [Revised: 06/08/2016] [Accepted: 06/18/2016] [Indexed: 02/06/2023]
Abstract
This two-sequence, three-period crossover study is the first pharmacokinetic (PK) study to compare all three innovator formulations of tacrolimus (twice-daily immediate-release tacrolimus capsules [IR-Tac]; once-daily extended-release tacrolimus capsules [ER-Tac]; novel once-daily tacrolimus tablets [LCPT]). Stable renal transplant patients were dosed with each drug for 7 days, and blood samples were obtained over 24 h. Thirty subjects were included in the PK analysis set. A conversion factor of 1:1:0.80 for IR-Tac:ER-Tac:LCPT was used; no dose adjustments were permitted during the study. The median (interquartile range) total daily dose was 6.0 (4.0-8.0) mg for IR-Tac and ER-Tac and 4.8 (3.3-6.3) for LCPT. Significantly higher exposure on a per milligram basis, lower intraday fluctuation and prolonged time (Tmax ) to peak concentration (Cmax ) were found for LCPT versus IR-Tac or ER-Tac. ER-Tac showed no differences versus IR-Tac in exposure, Cmax , Tmax or fluctuation. The observed exposure of IR-Tac was used to normalize exposure for LCPT and ER-Tac, resulting in the following recommended total daily dose conversion rates: IR-Tac:ER-Tac, +8%; IR-Tac:LCPT, -30%; ER-Tac:LCPT, -36%. After exposure normalization, Cmax was ~17% lower for LCPT than for IR-Tac or ER-Tac; Cmin was ~6% lower for LCPT compared with IR-Tac and 3% higher compared with ER-Tac.
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Affiliation(s)
- S. Tremblay
- Department of Internal MedicineDivision of Nephrology and HypertensionUniversity of Cincinnati College of MedicineCincinnatiOH
| | - V. Nigro
- Veloxis Pharmaceuticals, Inc.EdisonNJ
| | | | - E. S. Woodle
- Department of SurgeryDivision of TransplantationUniversity of Cincinnati College of MedicineCincinnatiOH
| | - R. R. Alloway
- Department of Internal MedicineDivision of Nephrology and HypertensionUniversity of Cincinnati College of MedicineCincinnatiOH
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Tahiri H, Omri S, Yang C, Duhamel F, Samarani S, Ahmad A, Vezina M, Bussières M, Vaucher E, Sapieha P, Hickson G, Hammamji K, Lapointe R, Rodier F, Tremblay S, Royal I, Cailhier JF, Chemtob S, Hardy P. Lymphocytic Microparticles Modulate Angiogenic Properties of Macrophages in Laser-induced Choroidal Neovascularization. Sci Rep 2016; 6:37391. [PMID: 27874077 PMCID: PMC5118818 DOI: 10.1038/srep37391] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [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: 05/31/2016] [Accepted: 10/27/2016] [Indexed: 11/13/2022] Open
Abstract
Pathological choroidal neovascularization (CNV) is the common cause of vision loss in patients with age-related macular degeneration (AMD). Macrophages possess potential angiogenic function in CNV. We have demonstrated that human T lymphocyte-derived microparticles (LMPs) exert a potent antiangiogenic effect in several pathological neovascularization models. In this study, we investigated the alteration of proangiogenic properties of macrophages by LMPs treatment in vitro and in vivo models. LMPs regulated the expression of several angiogenesis-related factors in macrophages and consequently stimulated their antiangiogenic effects evidenced by the suppression of the proliferation of human retinal endothelial cells in co-culture experiments. The involvement of CD36 receptor in LMPs uptake by macrophages was demonstrated by in vitro assays and by immunostaining of choroidal flat mounts. In addition, ex vivo experiments showed that CD36 mediates the antiangiogenic effect of LMPs in murine and human choroidal explants. Furthermore, intravitreal injection of LMPs in the mouse model of laser-induced CNV significantly suppressed CNV in CD36 dependent manner. The results of this study suggested an ability of LMPs to alter the gene expression pattern of angiogenesis-related factors in macrophages, which provide important information for a new therapeutic approach for efficiently interfering with both vascular and extravascular components of CNV.
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Affiliation(s)
- Houda Tahiri
- Department of Pharmacology, Université de Montréal, Montréal, QC, Canada.,Research Center CHU Sainte-Justine, Université de Montréal, Montréal, QC, Canada
| | - Samy Omri
- Research Center Hôpital Maisonneuve-Rosemont, Université de Montréal, Montréal, QC, Canada
| | - Chun Yang
- Research Center CHU Sainte-Justine, Université de Montréal, Montréal, QC, Canada
| | - François Duhamel
- Department of Pharmacology, Université de Montréal, Montréal, QC, Canada
| | - Suzanne Samarani
- Departments of Microbiology and Immunology, Université de Montréal, Montréal, QC, Canada
| | - Ali Ahmad
- Departments of Microbiology and Immunology, Université de Montréal, Montréal, QC, Canada
| | - Mark Vezina
- Charles River Laboratories, Senneville, Montreal, QC, Canada
| | | | - Elvire Vaucher
- School of Optometry, Université de Montréal, Montréal, QC, Canada
| | - Przemyslaw Sapieha
- Research Center Hôpital Maisonneuve-Rosemont, Université de Montréal, Montréal, QC, Canada.,Department of Ophthalmology, Université de Montréal, Montréal, QC, Canada
| | - Gilles Hickson
- Department of Pathology and Cell Biology, Université de Montréal, Montréal, QC, Canada
| | - Karim Hammamji
- Department of Ophthalmology, Université de Montréal, Montréal, QC, Canada
| | - Réjean Lapointe
- Institut du Cancer de Montréal, CRCHUM-Centre de Recherche du Centre Hospitalier de l'Université de Montréal and Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Francis Rodier
- Institut du Cancer de Montréal, CRCHUM-Centre de Recherche du Centre Hospitalier de l'Université de Montréal and Department of Medicine, Université de Montréal, Montréal, QC, Canada.,Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, QC, Canada
| | - Sophie Tremblay
- University of British Columbia, Vancouver, BC, Canada.,Centre for Molecular Medicine and Therapeutics, Vancouver, BC, Canada
| | - Isabelle Royal
- Institut du Cancer de Montréal, CRCHUM-Centre de Recherche du Centre Hospitalier de l'Université de Montréal and Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Jean-François Cailhier
- Institut du Cancer de Montréal, CRCHUM-Centre de Recherche du Centre Hospitalier de l'Université de Montréal and Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Sylvain Chemtob
- Department of Pharmacology, Université de Montréal, Montréal, QC, Canada.,Research Center CHU Sainte-Justine, Université de Montréal, Montréal, QC, Canada.,Research Center Hôpital Maisonneuve-Rosemont, Université de Montréal, Montréal, QC, Canada.,Department of Ophthalmology, Université de Montréal, Montréal, QC, Canada.,Department of Pediatrics, Université de Montréal, Montréal, QC, Canada
| | - Pierre Hardy
- Department of Pharmacology, Université de Montréal, Montréal, QC, Canada.,Research Center CHU Sainte-Justine, Université de Montréal, Montréal, QC, Canada.,Department of Pediatrics, Université de Montréal, Montréal, QC, Canada
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Abstract
Temporal awareness is key to successful decision making in a wide range of command and control situations, yet little explicit support to maintaining temporal awareness is provided by Decision Support Systems (DSS) for time-critical decisions. In the context of simulated weapon-target scheduling, the present study compared the decision support gained from two display formats: typical geospatial display and temporal display. The results demonstrated that the temporal display facilitates scheduling performance though its beneficial impact seems to require greater familiarization.
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Affiliation(s)
- R. Rousseau
- School of Psychology, Université Laval, Quebec, Canada
- Informatique WGZ, Quebec, Canada
| | - S. Tremblay
- School of Psychology, Université Laval, Quebec, Canada
| | - D. Lafond
- School of Psychology, Université Laval, Quebec, Canada
- Informatique WGZ, Quebec, Canada
| | - F. Vachon
- School of Psychology, Cardiff University, Cardiff, United Kingdom
| | - R. Breton
- Defence Research and Development Canada – Valcartier
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23
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Abstract
The present study aims to investigate how teams respond to workload transition due to a sudden and unexpected event in a complex and dynamic command and control (C2) environment. The C3Fire microworld (Granlund, 1998), a forest fire-fighting simulation, is used to compare divisional (territory-specific) and functional (role-specific) teams. Workload transition is induced by the sudden appearance of a second fire. Results show that functional teams' performance decreases while their communication frequency increases following the workload transition. However, they are faster to detect the second fire. This pattern of results suggests that in the context of C2 environments, the impact of a workload escalation varies as a function of team structure (functional vs. divisional) and the type of task (fire detection vs. fire fighting).
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Affiliation(s)
- M.-E. Jobidon
- Defence Research and Development Canada — Valcartier
| | - R. Breton
- Defence Research and Development Canada — Valcartier
| | - R. Rousseau
- Defence Research and Development Canada — Valcartier
- School of Psychology, Université Laval, Quebec, Canada
| | - S. Tremblay
- School of Psychology, Université Laval, Quebec, Canada
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24
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Larochelle A, Magny P, Tremblay S, De Médicis É. Pyruvate Kinase Deficiency which Causes Nonspherocytic Hemolytic Anemia: The Gene and its Mutations. Hematology 2016; 4:77-87. [DOI: 10.1080/10245332.1999.11746433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
- André Larochelle
- Faculty of Medicine, University of Sherbrooke, Quebec, Canada, J1H 5N4
| | - Pierre Magny
- Faculty of Medicine, University of Sherbrooke, Quebec, Canada, J1H 5N4
| | - Sophie Tremblay
- Faculty of Medicine, University of Sherbrooke, Quebec, Canada, J1H 5N4
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25
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Moussa A, Luangxay Y, Tremblay S, Lavoie J, Aube G, Savoie E, Lachance C. Videolaryngoscope for Teaching Neonatal Endotracheal Intubation: A Randomized Controlled Trial. Pediatrics 2016; 137:e20152156. [PMID: 26908701 DOI: 10.1542/peds.2015-2156] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [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] [Accepted: 12/08/2015] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVE To assess whether the videolaryngoscope (VL) is superior to the classic laryngoscope (CL) in acquiring skill in neonatal endotracheal intubation (ETI) and, once acquired with the VL, whether the skill is transferable to the CL. METHODS This randomized controlled trial, in a level 3 Canadian hospital, recruited junior pediatric residents who performed ETI in the NICU. The primary outcome was success rate of ETI. Secondary outcomes were time to successful intubation, number of bradycardia episodes andlowest oxygen saturation during procedure, occurrence of mucosal trauma, reason for ETI failure, and recognition of problems related to ETI bysupervisor andresident. RESULTS In phase 1, 34 pediatric residents performed 213 ETIs by using either VL or CL. Intervention groups were comparable at baseline. The success rate was higher (75.2% vs 63.4%, P = .03), and time to successful intubation was longer, inVL group (57 vs 47 seconds, P = .008). In phase 2, 23 residents performed 55 ETIs using CL. The success rate of residents inVL group performing ETI by using the CL was 63% (compared with 75% in phase 1, P = .16). CONCLUSIONS When learning ETI, the success rate is improved with the VL. Time to successful intubation is longer, but the difference is not clinically significant. When switched to the CL, residents' success rate slightly decreased, but not significantly. This suggests that residents retain a certain level of ETI skill when switched to the CL. The VL is a promising tool for teaching neonatal ETI.
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Affiliation(s)
- Ahmed Moussa
- Division of Neonatology, Department of Pediatrics, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada; and
| | - Yvon Luangxay
- Division of Neonatology, Department of Pediatrics, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada; and
| | - Sophie Tremblay
- Division of Neonatology, Department of Pediatrics, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada; and Centre for Molecular Medicine and Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Julie Lavoie
- Division of Neonatology, Department of Pediatrics, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada; and
| | - Guylaine Aube
- Division of Neonatology, Department of Pediatrics, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada; and
| | - Eve Savoie
- Division of Neonatology, Department of Pediatrics, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada; and
| | - Christian Lachance
- Division of Neonatology, Department of Pediatrics, Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada; and
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26
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Leroux A, Guérin A, Bussières JF, Lebel D, Tremblay S, Roy H, Métras ME, Beauchemin M, Bédard P. [Upgrading a pediatric pharmaceutical care service in Quebec]. Arch Pediatr 2016; 23:117-27. [PMID: 26795358 DOI: 10.1016/j.arcped.2015.11.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 11/13/2015] [Accepted: 11/18/2015] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Clinical pharmacy has developed since the 1960s in North America, with large disparities in the presence of decentralized pharmacists in hospital units between healthcare programs. Decentralized pharmacists have been present in pediatrics since the 1970s. The main objective of this study was to describe the steps used to upgrade the pediatrics department's pharmaceutical care. METHODS A descriptive study was conducted to upgrade the pharmaceutical care provided by two full-time equivalents in two pediatric sectors including 81 beds of a tertiary mother-child hospital. The upgrade includes three steps: a structured literature review, a description of the department, and a description of the practice upgrades proposed by the research team, in consensus with the clinical pharmacy team. RESULTS Out of the 236 articles initially identified, 13 relevant articles were found on the role and impact of pharmacists in pediatrics. Nine pharmaceutical activities were supported by high-quality data. Following the literature review and concerted reflection, 15 improvements were identified as feasible without increasing the staff. CONCLUSION There are data on the impact of pharmacists in pediatrics. This descriptive study illustrates a method that was used to upgrade the pediatrics sector in a university mother-child health center.
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Affiliation(s)
- A Leroux
- Département de pharmacie, unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, 3175, Côte-Sainte-Catherine, H3T 1C5 Montréal, Canada
| | - A Guérin
- Département de pharmacie, unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, 3175, Côte-Sainte-Catherine, H3T 1C5 Montréal, Canada
| | - J-F Bussières
- Département de pharmacie, unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, 3175, Côte-Sainte-Catherine, H3T 1C5 Montréal, Canada; Faculté de pharmacie, université de Montréal, 2940, chemin de la Polytechnique, H3C 3J7 Montréal, Canada
| | - D Lebel
- Département de pharmacie, unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, 3175, Côte-Sainte-Catherine, H3T 1C5 Montréal, Canada
| | - S Tremblay
- Département de pharmacie, unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, 3175, Côte-Sainte-Catherine, H3T 1C5 Montréal, Canada
| | - H Roy
- Département de pharmacie, unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, 3175, Côte-Sainte-Catherine, H3T 1C5 Montréal, Canada
| | - M-E Métras
- Département de pharmacie, unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, 3175, Côte-Sainte-Catherine, H3T 1C5 Montréal, Canada
| | - M Beauchemin
- Département de pharmacie, unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, 3175, Côte-Sainte-Catherine, H3T 1C5 Montréal, Canada
| | - P Bédard
- Département de pharmacie, unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, 3175, Côte-Sainte-Catherine, H3T 1C5 Montréal, Canada.
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27
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Giraudet L, Imbert JP, Bérenger M, Tremblay S, Causse M. The neuroergonomic evaluation of human machine interface design in air traffic control using behavioral and EEG/ERP measures. Behav Brain Res 2015. [DOI: 10.1016/j.bbr.2015.07.041] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Moussa A, Luangxay Y, Tremblay S, Lavoie J, Aube G, Savoie E, Lachance C. 7: Neonatal Endotracheal Intubation Learned with Videolaryngoscope is Maintained with Classic Laryngoscope: Phase 2 of a Crossover Randomized Trial. Paediatr Child Health 2015. [DOI: 10.1093/pch/20.5.e33a] [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: 11/12/2022] Open
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29
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Dhahri W, Dussault S, Haddad P, Turgeon J, Tremblay S, Desjarlais M, Mathieu R, Rivard A. Abstract 644: Role of Micro RNA LET-7F in Cigarette Smoke-Induced Impairment of Neovascularization. Arterioscler Thromb Vasc Biol 2015. [DOI: 10.1161/atvb.35.suppl_1.644] [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
Background:
Exposure to cigarette smoke is associated with impaired neovascularization in response to ischemia. The precise mechanisms involved in that process remain to be determined. Micro RNA (miR) are emerging as key regulators of several physiological processes, including angiogenesis. Here we investigated the potential role of miRs for the modulation of neovascularization in the context of cigarette smoking.
Methods and Results:
Human Umbilical Vascular Endothelial Cells (HUVECs) were exposed or not to cigarette smoke extracts (CSE). Using Affimetrix GeneChip miRNA array analysis, we found that the pro-angiogenic miR let-7f was downregulated by 40% in HUVECs exposed to CSE. Using an inhibitor of let-7f, we demonstrated reduced migration and tube formation in HUVECs, reproducing the phenotype induced by CSE. A let-7f mimic could rescue cellular migration and tube formation in HUVECs exposed to CSE. Moreover, the expression of let-7f is significantly reduced in the ischemic muscles of mice exposed to cigarette smoke (CS). In vivo, hindlimb ischemia was surgically provoked by femoral artery removal to mice exposed (SMK) or not to CS for two weeks with a local injection of a control or a let-7f mimic. Let-7f mimic could rescue blood flow recuperation and capillary density in ischemic muscles 21 days post-ischemia associated with improved mobility. We found that CS was associated with reduced number of endothelial progenitor cells (EPCs) and impairment of angiogenic activities. Importantly, let-7f mimic rescued EPC number and EPC functional activities in SMK group. TGF-β-RI and HIF1AN are predicted to be targeted by let-7f and both are increased in SMK mice, whereas the expression of HIF-1a and VEGF are reduced in these mice. Interestingly, SMK mice injected with a let-7f mimic have decreased muscle expression of TGF-β-RI and HIF1AN associated with normalized HIF-1 and VEGF expression.
Conclusion:
Our results suggest that a reduction in the expression of let-7f could be involved in the cigarette smoke-induced inhibition of angiogenesis through modulation of TGF-β-RI and HIF1AN. Overexpression of let-7f using a miR mimic could constitute a novel therapeutic strategy to improve ischemia-induced neovascularization in pathological conditions.
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Blanchette M, Gascon S, Tremblay S, Tremblay L, Guerin B, Lepage M, Lecomte R, Fortin D. ET-07 * DOES OSMOTIC BLOOD-BRAIN BARRIER DISRUPTION ALLOWS EFFLUX PUMP SUBSTRATES DELIVERY TO THE TUMOR AND CNS? Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou255.7] [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: 11/14/2022] Open
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31
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Tremblay S, Pieper F, Sachs A, Martinez-Trujillo J. Decoding the allocation of visual attention from prefrontal neural assemblies in behaving primates. J Vis 2014. [DOI: 10.1167/14.10.519] [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: 11/24/2022] Open
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32
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Moussa A, Luangxay Y, Tremblay S, Lavoie J, Aube G, Savoie E, Lachance C. 42: Videolaryngoscope vs Classic Laryngoscope in Teaching Neonatal Endotracheal Intubation: A Randomized Controlled Trial. Paediatr Child Health 2014. [DOI: 10.1093/pch/19.6.e35-41] [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: 11/13/2022] Open
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33
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Durantin G, Gagnon JF, Tremblay S, Dehais F. Using near infrared spectroscopy and heart rate variability to detect mental overload. Behav Brain Res 2014; 259:16-23. [DOI: 10.1016/j.bbr.2013.10.042] [Citation(s) in RCA: 165] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 10/21/2013] [Accepted: 10/24/2013] [Indexed: 11/26/2022]
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Tremblay S, Miloudi K, Chaychi S, Favret S, Binet F, Polosa A, Lachapelle P, Chemtob S, Sapieha P. Systemic inflammation perturbs developmental retinal angiogenesis and neuroretinal function. Invest Ophthalmol Vis Sci 2013; 54:8125-39. [PMID: 24204040 DOI: 10.1167/iovs.13-12496] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [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: 11/24/2022] Open
Abstract
PURPOSE Perinatal inflammatory stress in preterm babies is associated with increased rates of severe retinopathy of prematurity (ROP) and adverse neurological dysfunction. In this study, we set out to determine the consequences of severe systemic inflammatory stress on developmental retinal vascularization and evaluate the subsequent outcome on retinal function in later life. METHODS Systemic inflammatory stress was induced in C57BL/6J mouse pups by an intraperitoneal injection of lipopolysaccharide (LPS; 1 mg/kg) at postnatal day 4. In response to LPS, retinal inflammation was confirmed by quantitative RT-PCR analysis of diverse inflammatory markers. A detailed and systematic analysis of retinal microglial infiltration, retinal vascular morphology, density, and growth rate was performed at key time points throughout retinal vascularization. Retinal function in adult life was assessed by using electroretinography at 6 weeks postinjection. RESULTS As early as 48 hours after intraperitoneal administration of LPS, a significant increase in retinal vascular density was noted throughout the retina. A pronounced increase in the number of activated microglial cell was observed in the retinal ganglion cell layer and in the outer plexiform layer just prior to their vascularization; direct physical contact between activated microglia and sprouting vessels suggested that microglia partake in promoting the aberrant retinal vascularization. With maturity, animals subjected to perinatal inflammatory stress displayed depleted retinal vascular beds and had significantly decreased retinal function as determined by electroretinography. CONCLUSIONS Our data reveal that early severe postnatal inflammatory stress leads to abnormal retinal vascular development and increased vessel anastomosis and, ultimately, permanently compromises retinal function. The aberrant and initially exaggerated retinal vascularization observed is associated with microglial activation, providing a cellular mechanism by which perinatal sepsis predisposes to ROP.
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Affiliation(s)
- Sophie Tremblay
- Department of Ophthalmology, Maisonneuve-Rosemont Hospital Research Centre, University of Montreal, Montreal, Quebec, Canada
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35
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Dussault S, Haddad P, Turgeon J, Tremblay S, Groleau J, Rivard A. Cigarette Smoke-Induced Impairment of Angiogenesis: Role of Micro RNAS. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.273] [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: 10/26/2022] Open
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36
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Dussault S, Turgeon J, Groleau J, Haddad P, Tremblay S, Rivard A. Fish Oil Improves the Paracrine and Functional Activities of Endothelial Progenitor Cells: Implications for Postnatal Neovascularization. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.609] [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: 11/24/2022] Open
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37
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Gulli RA, Tremblay S, Adamantidis AR, Martinez-Trujillo JC. Optogenetic stimulation of the frontal eye field in an awake, behaving monkey. J Vis 2013. [DOI: 10.1167/13.9.228] [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: 11/24/2022] Open
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38
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Tremblay S, Asquini L, Sachs A, Pieper F, Martinez J. Neuronal population activity in area 8a of macaques predicts saccade end point. J Vis 2013. [DOI: 10.1167/13.9.1202] [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: 11/24/2022] Open
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39
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Binet F, Mawambo G, Sitaras N, Tetreault N, Lapalme E, Favret S, Cerani A, Leboeuf D, Tremblay S, Rezende F, Juan AM, Stahl A, Joyal JS, Milot E, Kaufman RJ, Guimond M, Kennedy TE, Sapieha P. Neuronal ER stress impedes myeloid-cell-induced vascular regeneration through IRE1α degradation of netrin-1. Cell Metab 2013; 17:353-71. [PMID: 23473031 DOI: 10.1016/j.cmet.2013.02.003] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [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: 04/25/2012] [Revised: 10/26/2012] [Accepted: 01/23/2013] [Indexed: 12/13/2022]
Abstract
In stroke and proliferative retinopathy, despite hypoxia driven angiogenesis, delayed revascularization of ischemic tissue aggravates the loss of neuronal function. What hinders vascular regrowth in the ischemic central nervous system remains largely unknown. Using the ischemic retina as a model of neurovascular interaction in the CNS, we provide evidence that the failure of reparative angiogenesis is temporally and spatially associated with endoplasmic reticulum (ER) stress. The canonical ER stress pathways of protein kinase RNA-like ER kinase (PERK) and inositol-requiring enzyme-1α (IRE1α) are activated within hypoxic/ischemic retinal ganglion neurons, initiating a cascade that results in angiostatic signals. Our findings demonstrate that the endoribonuclease IRE1α degrades the classical guidance cue netrin-1. This neuron-derived cue triggers a critical reparative-angiogenic switch in neural macrophage/microglial cells. Degradation of netrin-1, by persistent neuronal ER stress, thereby hinders vascular regeneration. These data identify a neuronal-immune mechanism that directly regulates reparative angiogenesis.
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Affiliation(s)
- François Binet
- Department of Ophthalmology, Maisonneuve-Rosemont Hospital Research Centre, University of Montreal, Montreal, QC H1T 2M4, Canada
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Usvyat LA, Raimann J, Thijssen S, van der Sande FM, Kooman J, Levin NW, Kotanko P, Von Gersdorff G, Schaller M, Bayh I, Etter M, Grassmann A, Guinsburg A, Kooman J, Lam M, Marcelli D, Marelli C, Scatizzi L, Tashman A, Thijssen S, Toffelmire T, Usvyat L, Van der Sande F, Wang Y, Levin NW, Barth C, Kotanko P, Moffitt T, Moffitt T, Hariton F, Devlin M, Garrett P, Hannon-Fletcher M, Ekramzadeh M, Sohrabi Z, Salehi M, Fallahzadeh MK, Ayatollahi M, Geramizadeh B, Hassanzadeh J, Sagheb MM, Beberashvili I, Beberashvili I, Sinuani I, Azar A, Kadoshi H, Shapiro G, Feldman L, Averbukh Z, Weissgarten J, Abe Y, Watanabe M, Ito K, Sasatomi Y, Ogahara S, Nakashima H, Saito T, Witt S, Kunze R, Guth HJ, Skarabis H, Kunze R, Vienken J, Nowak P, Wilk R, Mamelka B, Prymont-Przyminska A, Zwolinska A, Sarniak A, Wlodarczyk A, Rysz J, Nowak D, Trajceska L, Dzekova-Vidimliski P, Gelev S, Arsov S, Sikole A, Sonikian M, Dona A, Skarakis I, Metaxaki P, Chiotis C, Papoutsis I, Karaitianou A, Spiliopoulou C, Marcelli D, Tashman A, Guinsburg A, Grassmann A, Barth C, Marelli C, Van der Sande FM, Von Gersdorff G, Bayh I, Kooman J, Scatizzi L, Lam M, Schaller M, Etter M, Thijssen S, Toffelmire T, Wang Y, Usvyat LA, Kotanko P, Levin NW, Teta D, Teta D, Tappy L, Theumann N, Halabi G, Gauthier T, Mathieu C, Tremblay S, Coti P, Burnier M, Zanchi A, Martinez Vea A, Cabre C, Villa D, Munoz M, Vives JP, Arruche M, Soler J, Compte MT, Aguilera J, Romeu M, Giralt M, Barril G, Anaya S, Vozmediano C, Celayeta A, Novillo R, Bernal V, Beiret I, Huarte E, Martin J, Santana H, Torres G, Sousa F, Sanchez R, Lopez-Montes A, Tornero F, Uson J, Pousa M, Giorgi M, Rdez Cubillo B, Malhotra R, Malhotra R, Usvyat L, Abbas SR, Thjissen S, Carter M, Etter M, Tashman A, Guinsburg A, Grassmann A, Barth C, Marelli C, Van der Sande F, von Gersdorff G, Bayh I, Kooman J, Scatizzi L, Lam M, Schaller M, Toffelmire T, Wang Y, Marcelli D, Levin N, Kotanko P, Jens R, Tepel M, Katharina E, Andrea H, Simone F, Florian S, Slusanschi O, Garneata L, Moraru R, Preoteasa E, Barbulescu C, Santimbrean C, Klein C, Dragomir D, Mircescu G, Idorn T, Knop F, Holst JJ, Hornum M, Feldt-Rasmussen B, Son YK, An WS, Kim SE, Kim KH, Garneata L, Slusanschi O, Preoteasa E, Barbulescu C, Santimbrean C, Klein C, Mircescu G, Borrelli S, Minutolo R, De Nicola L, Conte G, De Simone W, Zito B, Guastaferro P, Nigro F, Bassi A, Leone L, Credendino O, Genualdo R, Capuano M, Iulianiello G, Auricchio MR, Sezer S, Bal Z, Tutal E, Erkmen Uyar M, Ozdemir Acar FN, Ribeiro S, Faria MS, Melo F, Sereno J, Freitas I, Mendonca M, Nascimento H, Fernandes J, Rocha-Pereira P, Miranda V, Mendonca D, Quintanilha A, Belo L, Costa E, Reis F, Santos-Silva A, Valtuille R, Casos ME, Fernandez EA. Nutrition, inflammation and oxidative stress - CKD 5D. Nephrol Dial Transplant 2012. [DOI: 10.1093/ndt/gfs228] [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: 11/13/2022] Open
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Nugent S, Croteau E, Pifferi F, Fortier M, Tremblay S, Turcotte E, Cunnane SC. Brain and systemic glucose metabolism in the healthy elderly following fish oil supplementation. Prostaglandins Leukot Essent Fatty Acids 2011; 85:287-91. [PMID: 21795034 DOI: 10.1016/j.plefa.2011.04.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Cerebral metabolic rate of glucose (CMRg) is lower in individuals affected by cognitive decline and dementia, especially in Alzheimer's disease. However, as yet there is no consensus as to whether CMRg decreases during healthy aging. Epidemiological studies show that weekly consumption of fish abundant in ω3 fatty acids has a protective effect on cognition during aging. Thus, the primary objective of this human study was to use positron emission tomography analysis with (18)F-fluorodeoxyglucose to evaluate whether supplementation with a fish oil rich in ω3 fatty acids increases cerebral glucose metabolism in young or elderly adults. Healthy young (23±5y old; n=5) and elderly (76±3y old; n=6) women and men were included in the study. Semi-quantitative expression of the data as 'standardized uptake values' showed that elderly participants had significantly lower cerebral glucose metabolism compared with the young group. However, when expressed quantitatively a CMRg, there was no effect of age or ω3 supplementation on glucose metabolism in any of the brains regions studied. Higher plasma triglyceride levels and higher plasma insulin levels were associated with lower CMRg in several regions, suggesting that a trend towards the metabolic syndrome may be associated with cerebral hypometabolism. We conclude that under these experimental conditions, ω3 supplementation did not affect brain glucose metabolism in the healthy elderly. Future studies in this area should address whether glucose intolerance or other conditions linked to the metabolic syndrome impact negatively on brain glucose metabolism and cognition.
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Affiliation(s)
- S Nugent
- Research Center on Aging, Université de Sherbrooke, Sherbrooke, Que., Canada J1H 4C4
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Vachon F, Tremblay S, Nicholls AP, Jones DM. Exploiting the Auditory Modality in Decision Support: Beneficial "Warning" Effects and Unavoidable Costs. ACTA ACUST UNITED AC 2011. [DOI: 10.1177/1071181311551292] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zaniolo K, Sapieha P, Shao Z, Stahl A, Zhu T, Tremblay S, Picard E, Madaan A, Blais M, Lachapelle P, Mancini J, Hardy P, Smith LEH, Ong H, Chemtob S. Ghrelin modulates physiologic and pathologic retinal angiogenesis through GHSR-1a. Invest Ophthalmol Vis Sci 2011; 52:5376-86. [PMID: 21642627 DOI: 10.1167/iovs.10-7152] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE Vascular degeneration and the ensuing abnormal vascular proliferation are central to proliferative retinopathies. Given the metabolic discordance associated with these diseases, the authors explored the role of ghrelin and its growth hormone secretagogue receptor 1a (GHSR-1a) in proliferative retinopathy. METHODS In a rat model of oxygen-induced retinopathy (OIR), the contribution of ghrelin and GHSR-1a was investigated using the stable ghrelin analogs [Dap3]-ghrelin and GHRP6 and the GSHR-1a antagonists JMV-2959 and [D-Lys3]-GHRP-6. Plasma and retinal levels of ghrelin were analyzed by ELISA, whereas retinal expression and localization of GHSR-1a were examined by immunohistochemistry and Western blot analysis. The angiogenic and vasoprotective properties of ghrelin and its receptor were further confirmed in aortic explants and in models of vaso-obliteration. RESULTS Ghrelin is produced locally in the retina, whereas GHSR-1a is abundantly expressed in retinal endothelial cells. Ghrelin levels decrease during the vaso-obliterative phase and rise during the proliferative phase of OIR. Intravitreal delivery of [Dap3]-ghrelin during OIR significantly reduces retinal vessel loss when administered during the hyperoxic phase. Conversely, during the neovascular phase, ghrelin promotes pathologic angiogenesis through the activation of GHSR-1a. These angiogenic effects were confirmed ex vivo in aortic explants. CONCLUSIONS New roles were disclosed for the ghrelin-GHSR-1a pathway in the preservation of retinal vasculature during the vaso-obliterative phase of OIR and during the angiogenic phase of OIR. These findings suggest that the ghrelin-GHSR-1a pathway can exert opposing effects on retinal vasculature, depending on the phase of retinopathy, and thus holds therapeutic potential for proliferative retinopathies.
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Affiliation(s)
- Karine Zaniolo
- Department of Pediatrics, Hôpital Sainte-Justine Research Center, Montreal, Quebec, Canada
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Lachaine M, Tremblay S, Lathuiliere F, Wallace HJ, Falco T. WE-D-220-05: Development of Autoscanning 3D Ultrasound Technology for Radiotherapy Simulation, Planning and IGRT. Med Phys 2011. [DOI: 10.1118/1.3613359] [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: 11/07/2022] Open
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Brisson B, Coll MP, Tremblay S. Complexity and similarity in visual memory. J Vis 2010. [DOI: 10.1167/10.7.759] [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: 11/24/2022] Open
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Honoré JC, Kooli A, Hou X, Hamel D, Rivera JC, Picard É, Hardy P, Tremblay S, Varma DR, Jankov RP, Mancini JA, Balazy M, Chemtob S. Sustained hypercapnia induces cerebral microvascular degeneration in the immature brain through induction of nitrative stress. Am J Physiol Regul Integr Comp Physiol 2010; 298:R1522-30. [DOI: 10.1152/ajpregu.00807.2009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Hypercapnia is regularly observed in chronic lung disease, such as bronchopulmonary dysplasia in preterm infants. Hypercapnia results in increased nitric oxide synthase activity and in vitro formation of nitrates. Neural vasculature of the immature subject is particularly sensitive to nitrative stress. We investigated whether exposure to clinically relevant sustained high CO2 causes microvascular degeneration in the newborn brain by inducing nitrative stress, and whether this microvascular degeneration has an impact on brain growth. Newborn rat pups were exposed to 10% CO2 as inspired gas (PaCO2 = 60–70 mmHg) starting within 24 h of birth until postnatal day 7 (P7). Brains were notably collected at different time points to measure vascular density, determine brain cortical nitrite/nitrate, and trans-arachidonic acids (TAAs; products of nitration) levels as effectors of vessel damage. Chronic exposure of rat pups to high CO2 (PaCO2 ≈ 65 mmHg) induced a 20% loss in cerebrovascular density at P3 and a 15% decrease in brain mass at P7; at P30, brain mass remained lower in CO2-exposed animals. Within 24 h of exposure to CO2, brain eNOS expression and production of nitrite/nitrate doubled, lipid nitration products (TAAs) increased, and protein nitration (3-nitrotyrosine immunoreactivity) was also coincidently augmented on brain microvessels (lectin positive). Intracerebroventricular injection of TAAs (10 μM) replicated cerebrovascular degeneration. Treatment of rat pups with NOS inhibitor (l-Nω-nitroarginine methyl ester) or a peroxynitrite decomposition catalyst (FeTPPS) prevented hypercapnia-induced microvascular degeneration and preserved brain mass. Cytotoxic effects of high CO2 were reproduced in vitro /ex vivo on cultured endothelial cells and sprouting microvessels. In summary, hypercapnia at values frequently observed in preterm infants with chronic lung disease results in increased nitrative stress, which leads to cerebral cortical microvascular degeneration and curtails brain growth.
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Affiliation(s)
- Jean-Claude Honoré
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
| | - Amna Kooli
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Quebec, Canada
| | - Xin Hou
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
| | - David Hamel
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
| | - José Carlos Rivera
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
| | - Émilie Picard
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
| | - Pierre Hardy
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
| | - Sophie Tremblay
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
| | - Daya R. Varma
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Quebec, Canada
| | - Robert P. Jankov
- Department of Pediatrics, University of Toronto, Toronto, Ontario, Canada; and
| | - Joseph A. Mancini
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
| | - Michael Balazy
- Department of Pathology, New York Medical College, New York, New York
| | - Sylvain Chemtob
- Department of Pediatrics, Research Center-Centre Hospitalier Universitaire Ste-Justine, Montréal, Quebec, Canada
- Department of Pharmacology, Université de Montréal, Quebec, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Quebec, Canada
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De Beaumont L, Théoret H, Mongeon D, Messier J, Leclerc S, Tremblay S, Ellemberg D, Lassonde M. Brain Function Decline in Healthy Retired Athletes who Sustained their Last Sports Concussion in Early Adulthood. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70070-9] [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: 10/20/2022] Open
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Kooli A, Kermorvant-Duchemin E, Sennlaub F, Bossolasco M, Hou X, Honoré JC, Dennery PA, Sapieha P, Varma D, Lachapelle P, Zhu T, Tremblay S, Hardy P, Jain K, Balazy M, Chemtob S. trans-Arachidonic acids induce a heme oxygenase-dependent vasorelaxation of cerebral microvasculature. Free Radic Biol Med 2008; 44:815-25. [PMID: 18082639 DOI: 10.1016/j.freeradbiomed.2007.11.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2007] [Revised: 10/24/2007] [Accepted: 11/07/2007] [Indexed: 10/22/2022]
Abstract
Nitrative stress is an important regulator of vascular tone. We have recently described that trans-arachidonic acids (TAA) are major products of NO(2)(.)-mediated isomerization of arachidonic acid in cell membranes and that nitrative stress increases TAA levels leading to neural microvascular degeneration. In the present study, we explored whether TAA exert acute effects on neuromicrovascular tone and investigated potential mechanisms thereof. TAA induced an endothelium-dependent vasorelaxation of rat brain pial microvasculature. This vasorelaxation was independent of nitric oxide, prostanoids, lipoxygenase products, and CYP(450) metabolite trans-hydroxyeicosatetraenoic acids. However, inhibition of heme oxygenase (using zinc protoporphyrin IX) and of dependent soluble guanylate cyclase (sGC; using ODQ) significantly diminished (by approximately 70%) the TAA-induced vasorelaxation. Consistent with these findings, TAA stimulated heme oxygenase (HO)-2-dependent bilirubin (using siRNA HO-2) and cGMP formation, and the HO product carbon monoxide (using CO-releasing CORM-2) reproduced the sGC-dependent cGMP formation and vasorelaxation. Further exploration revealed that TAA-induced vasorelaxation and bilirubin formation (HO activation) were nearly abrogated by large-conductance calcium-dependent potassium channels (BK(Ca)) (using TEA and iberiotoxin). Opening of BK(Ca) with the selective activator NS1619 induced a concentration-dependent vasorelaxation, which was inhibited by HO and sGC inhibitors. Coimmunoprecipitation suggested a molecular complex interaction between BK(Ca) and HO-2 (but not HO-1). Collectively, these findings identify new properties of TAA, specifically cerebral vasorelaxation through interactive activation of BK(Ca) with HO-2 and, in turn, sGC. Our findings provide new insights into the characterization of nitrative stress-derived TAA products, by showing they can act as acute mediators of nitrative stress on neurovascular tone.
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Affiliation(s)
- Amna Kooli
- Department of Paediatrics, Research Center of Hôpital Ste-Justine, Montréal, Quebec, Canada
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Bradley G, Tremblay S, Irish J, MacMillan C, Baker G, Gullane P, Benchimol S. The expression of p53-induced protein with death domain (Pidd) and apoptosis in oral squamous cell carcinoma. Br J Cancer 2007; 96:1425-32. [PMID: 17437012 PMCID: PMC2360189 DOI: 10.1038/sj.bjc.6603745] [Citation(s) in RCA: 12] [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] [Indexed: 11/09/2022] Open
Abstract
The Pidd (p53-induced protein with death domain) gene was shown to be induced by the tumour suppressor p53 and to mediate p53-dependent apoptosis in mouse and human cells, through interactions with components of both the mitochondrial and the death receptor signalling pathways. To study the role of Pidd in clinical tumours, we measured its expression by quantitative reverse transcription-PCR in microdissected oral squamous cell carcinomas (OSCC) with and without p53 mutation. Tumour cell apoptosis was assessed by in situ terminal deoxynucleotidyl transferase-mediated dUTP nick-end labelling. Tumour proliferation was assessed by immunohistochemical staining for the Ki-67 antigen. We found a wide range of Pidd expression among OSCC. Statistical analysis revealed an association between Pidd expression and apoptotic index (Mann-Whitney test, P<0.001), consistent with a role of Pidd in apoptosis in this tumour type. Furthermore, we showed a positive correlation between apoptotic index and proliferative index that has not been previously described for OSCC. There was no correlation between Pidd expression and the p53 mutation status of these tumours, suggesting that Pidd expression may be regulated by p53-independent mechanisms. Further characterisation of these molecular defects in the control of proliferation and apoptosis should help in developing treatments that target OSCC according to their biological properties.
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Affiliation(s)
- G Bradley
- Faculty of Dentistry, University of Toronto, Toronto, ON, Canada.
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Sanmartin C, Ross NA, Tremblay S, Wolfson M, Dunn JR, Lynch J. Labour market income inequality and mortality in North American metropolitan areas. J Epidemiol Community Health 2003; 57:792-7. [PMID: 14573584 PMCID: PMC1732288 DOI: 10.1136/jech.57.10.792] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVE To investigate relations between labour market income inequality and mortality in North American metropolitan areas. METHODS An ecological cross sectional study of relations between income inequality and working age (25-64 years) mortality in 53 Canadian (1991) and 282 US (1990) metropolitan areas using four measures of income inequality. Two labour market income concepts were used: labour market income for households with non-trivial attachment to the labour market and labour market income for all households, including those with zero and negative incomes. Relations were assessed with weighted and unweighted bivariate and multiple regression analyses. RESULTS US metropolitan areas were more unequal than their Canadian counterparts, across inequality measures and income concepts. The association between labour market income inequality and working age mortality was robust in the US to both the inequality measure and income concept, but the association was inconsistent in Canada. Three of four inequality measures were significantly related to mortality in Canada when households with zero and negative incomes were included. In North American models, increases in earnings inequality were associated with hypothetical increases in working age mortality rates of between 23 and 33 deaths per 100 000, even after adjustment for median metropolitan incomes. CONCLUSIONS This analysis of labour market inequality provides more evidence regarding the robust nature of the relation between income inequality and mortality in the US. It also provides a more refined understanding of the nature of the relation in Canada, pointing to the role of unemployment in generating Canadian metropolitan level health inequalities.
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Affiliation(s)
- C Sanmartin
- Health Analysis and Measurement Group, Statistics Canada, RH Coats Building, 24th Floor Section R, Ottawa, Ontario, Canada K1A 0T6.
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