1
|
Pereira GV, Boudaud M, Wolter M, Alexander C, De Sciscio A, Grant ET, Trindade BC, Pudlo NA, Singh S, Campbell A, Shan M, Zhang L, Yang Q, Willieme S, Kim K, Denike-Duval T, Fuentes J, Bleich A, Schmidt TM, Kennedy L, Lyssiotis CA, Chen GY, Eaton KA, Desai MS, Martens EC. Opposing diet, microbiome, and metabolite mechanisms regulate inflammatory bowel disease in a genetically susceptible host. Cell Host Microbe 2024; 32:527-542.e9. [PMID: 38513656 PMCID: PMC11064055 DOI: 10.1016/j.chom.2024.03.001] [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: 06/30/2023] [Revised: 12/18/2023] [Accepted: 03/01/2024] [Indexed: 03/23/2024]
Abstract
Inflammatory bowel diseases (IBDs) are chronic conditions characterized by periods of spontaneous intestinal inflammation and are increasing in industrialized populations. Combined with host genetics, diet and gut bacteria are thought to contribute prominently to IBDs, but mechanisms are still emerging. In mice lacking the IBD-associated cytokine, interleukin-10, we show that a fiber-deprived gut microbiota promotes the deterioration of colonic mucus, leading to lethal colitis. Inflammation starts with the expansion of natural killer cells and altered immunoglobulin-A coating of some bacteria. Lethal colitis is then driven by Th1 immune responses to increased activities of mucin-degrading bacteria that cause inflammation first in regions with thinner mucus. A fiber-free exclusive enteral nutrition diet also induces mucus erosion but inhibits inflammation by simultaneously increasing an anti-inflammatory bacterial metabolite, isobutyrate. Our findings underscore the importance of focusing on microbial functions-not taxa-contributing to IBDs and that some diet-mediated functions can oppose those that promote disease.
Collapse
Affiliation(s)
| | - Marie Boudaud
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg
| | - Mathis Wolter
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg; Faculty of Science, Technology and Medicine, University of Luxembourg, 4365 Esch-sur-Alzette, Luxembourg
| | - Celeste Alexander
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Alessandro De Sciscio
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg
| | - Erica T Grant
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg; Faculty of Science, Technology and Medicine, University of Luxembourg, 4365 Esch-sur-Alzette, Luxembourg
| | | | - Nicholas A Pudlo
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Shaleni Singh
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Austin Campbell
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Mengrou Shan
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA; Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Li Zhang
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA; Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Qinnan Yang
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Stéphanie Willieme
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg
| | - Kwi Kim
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Trisha Denike-Duval
- Unit for Laboratory Animal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Jaime Fuentes
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - André Bleich
- Institute for Laboratory Animal Science, Hanover Medical School, Hanover, Germany
| | - Thomas M Schmidt
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI, USA; Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA; Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, USA
| | - Lucy Kennedy
- Unit for Laboratory Animal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Costas A Lyssiotis
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA; Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Grace Y Chen
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Kathryn A Eaton
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Mahesh S Desai
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg; Odense Research Center for Anaphylaxis, Department of Dermatology and Allergy Center, Odense University Hospital, University of Southern Denmark, Odense, Denmark.
| | - Eric C Martens
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI, USA.
| |
Collapse
|
2
|
Pereira GV, Boudaud M, Wolter M, Alexander C, De Sciscio A, Grant ET, Trindade BC, Pudlo NA, Singh S, Campbell A, Shan M, Zhang L, Willieme S, Kim K, Denike-Duval T, Bleich A, Schmidt TM, Kennedy L, Lyssiotis CA, Chen GY, Eaton KA, Desai MS, Martens EC. Unravelling specific diet and gut microbial contributions to inflammatory bowel disease. Res Sq 2023:rs.3.rs-2518251. [PMID: 36993463 PMCID: PMC10055531 DOI: 10.21203/rs.3.rs-2518251/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Inflammatory bowel disease (IBD) is a chronic condition characterized by periods of spontaneous intestinal inflammation and is increasing in industrialized populations. Combined with host genetic predisposition, diet and gut bacteria are thought to be prominent features contributing to IBD, but little is known about the precise mechanisms involved. Here, we show that low dietary fiber promotes bacterial erosion of protective colonic mucus, leading to lethal colitis in mice lacking the IBD-associated cytokine, interleukin-10. Diet-induced inflammation is driven by mucin-degrading bacteria-mediated Th1 immune responses and is preceded by expansion of natural killer T cells and reduced immunoglobulin A coating of some bacteria. Surprisingly, an exclusive enteral nutrition diet, also lacking dietary fiber, reduced disease by increasing bacterial production of isobutyrate, which is dependent on the presence of a specific bacterial species, Eubacterium rectale. Our results illuminate a mechanistic framework using gnotobiotic mice to unravel the complex web of diet, host and microbial factors that influence IBD.
Collapse
Affiliation(s)
| | - Marie Boudaud
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg
| | - Mathis Wolter
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg
- Faculty of Science, Technology and Medicine, University of Luxembourg, 4365 Esch-sur-Alzette, Luxembourg
| | - Celeste Alexander
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Alessandro De Sciscio
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg
| | - Erica. T. Grant
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg
- Faculty of Science, Technology and Medicine, University of Luxembourg, 4365 Esch-sur-Alzette, Luxembourg
| | | | - Nicholas A. Pudlo
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Shaleni Singh
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Austin Campbell
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Mengrou Shan
- Dept. of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
- Dept. of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, Michigan, USA
| | - Li Zhang
- Dept. of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
- Dept. of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, Michigan, USA
| | - Stéphanie Willieme
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg
| | - Kwi Kim
- Dept. of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Trisha Denike-Duval
- Unit for Laboratory Animal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - André Bleich
- Institute for Laboratory Animal Science, Hanover Medical School, Hanover, Germany
| | - Thomas M. Schmidt
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, USA
- Dept. of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
- Dept. of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, Michigan, USA
| | - Lucy Kennedy
- Unit for Laboratory Animal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Costas A. Lyssiotis
- Dept. of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
- Dept. of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, Michigan, USA
| | - Grace Y. Chen
- Dept. of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Kathryn A. Eaton
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Mahesh S. Desai
- Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg
- Odense Research Center for Anaphylaxis, Department of Dermatology and Allergy Center, Odense University Hospital, University of Southern Denmark, 5000 Odense, Denmark
| | - Eric C. Martens
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, USA
| |
Collapse
|
3
|
Hughes C, Savage M, Alexander C. Service evaluation of the impact of implementing a novel physiotherapy band 5 mixed research and clinical rotation. Physiotherapy 2022. [DOI: 10.1016/j.physio.2021.12.120] [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: 10/19/2022]
|
4
|
Phungviwatnikul T, Alexander C, Do S, He F, Suchodolski JS, de Godoy MRC, Swanson KS. Effects of Dietary Macronutrient Profile on Apparent Total Tract Macronutrient Digestibility and Fecal Microbiota, Fermentative Metabolites, and Bile Acids of Female Dogs after Spay Surgery. J Anim Sci 2021; 99:6333593. [PMID: 34333604 DOI: 10.1093/jas/skab225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Accepted: 07/29/2021] [Indexed: 11/13/2022] Open
Abstract
Obesity and estrogen reduction are known to impact the gut microbiota and gut microbial-derived metabolites in some species, but limited information is available in dogs. The aim of this study was to determine the effects of dietary macronutrient profile on apparent total tract macronutrient digestibility, fecal microbiota, and fecal metabolites of adult female dogs after spay surgery. Twenty-eight adult intact female beagles (age: 3.02 ± 0.71 yr, BW: 10.28 ± 0.77 kg; BCS: 4.98 ± 0.57) were used. After a 5-wk baseline phase (wk 0), 24 dogs were spayed and randomly allotted to one of three experimental diets (n=8/group): 1) control (CO) containing moderate protein and fiber (COSP), 2) high-protein, high-fiber (HPHF), or 3) high-protein, high-fiber plus omega-3 and medium-chain fatty acids (HPHFO). Four dogs were sham-operated and fed CO (COSH). All dogs were fed to maintain BW for 12 wk after spay, then allowed to consume twice that amount for 12 wk. Fecal samples were collected at wk 0, 12, and 24 for digestibility, microbiota, and metabolite analysis. All data were analyzed using repeated measures and linear Mixed Models procedure of SAS 9.4, with results reported as change from baseline. Apparent organic matter and energy digestibilities had greater decreases in HPHF and HPHFO than COSH and COSP. Increases in fecal acetate, total short-chain fatty acids, and secondary bile acids were greater and decreases in primary bile acids were greater in HPHF and HPHFO. Principal coordinates analysis of weighted UniFrac distances revealed that HPHF and HPHFO clustered together and separately from COSH and COSP at wk 12 and 24, with relative abundances of Faecalibacterium, Romboutsia, and Fusobacterium increasing to a greater extent and Catenibacterium, Bifidobacterium, Prevotella 9, Eubacterium, and Megamonas decreasing to a greater extent in HPHF or HPHFO. Our results suggest that high-protein, high-fiber diets alter nutrient and energy digestibilities, fecal metabolite concentrations, and fecal gut microbiota, but spay surgery had minor effects. Future research is needed to investigate how food intake, nutrient profile, and changes in hormone production influence gut microbiota and metabolites of dogs individually and how this knowledge may be used to manage spayed pets.
Collapse
Affiliation(s)
| | - Celeste Alexander
- Division of Nutritional Sciences, University of Illinois, Urbana, IL, USA
| | - Sungho Do
- Department of Animal Sciences, University of Illinois, Urbana, IL, USA
| | - Fei He
- Department of Animal Sciences, University of Illinois, Urbana, IL, USA
| | - Jan S Suchodolski
- Gastrointestinal Laboratory, Department of Small Animal Clinical Sciences, Texas A&M University, College Station, TX, USA
| | - Maria R C de Godoy
- Department of Animal Sciences, University of Illinois, Urbana, IL, USA.,Division of Nutritional Sciences, University of Illinois, Urbana, IL, USA
| | - Kelly S Swanson
- Department of Animal Sciences, University of Illinois, Urbana, IL, USA.,Department of Veterinary Clinical Medicine, University of Illinois, Urbana, IL, USA.,Division of Nutritional Sciences, University of Illinois, Urbana, IL, USA
| |
Collapse
|
5
|
Oba PM, Carroll MQ, Alexander C, Somrak AJ, Keating SCJ, Sage AM, Swanson KS. Dental chews positively shift the oral microbiota of adult dogs. J Anim Sci 2021; 99:6199860. [PMID: 33780530 DOI: 10.1093/jas/skab100] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 01/25/2021] [Accepted: 03/24/2021] [Indexed: 12/21/2022] Open
Abstract
Microbiota plays a prominent role in periodontal disease, but the canine oral microbiota and how dental chews may affect these populations have been poorly studied. We aimed to determine the differences in oral microbiota of adult dogs consuming dental chews compared with control dogs consuming only a diet. Twelve adult female beagle dogs (mean age = 5.31 ± 1.08 yr) were used in a replicated 4 × 4 Latin square design consisting of 28-d periods. Treatments (n = 12/group) included: diet only (CT); diet + Bones & Chews Dental Treats (BC; Chewy, Inc., Dania Beach, FL); diet + Dr. Lyon's Grain-Free Dental Treats (DL; Dr. Lyon's, LLC, Dania Beach, FL); and diet + Greenies Dental Treats (GR; Mars Petcare US, Franklin, TN). Each day, one chew was provided 4 h after mealtime. On day 27, breath samples were analyzed for total volatile sulfur compound concentrations using a Halimeter. On day 0 of each period, teeth were cleaned by a veterinary dentist blinded to treatments. Teeth were scored for plaque, calculus, and gingivitis by the same veterinary dentist on day 28 of each period. After scoring, salivary (SAL), subgingival (SUB), and supragingival (SUP) samples were collected for microbiota analysis using Illumina MiSeq. All data were analyzed using SAS (version 9.4) using the Mixed Models procedure, with P < 0.05 considered significant. All dogs consuming chews had lower calculus coverage and thickness, pocket depth and bleeding, plaque thickness, and halitosis compared with CT. In all sites of collection, CT dogs had a higher relative abundance of one or more potentially pathogenic bacteria (Porphyromonas, Anaerovorax, Desulfomicrobium, Tannerella, and Treponema) and lower relative abundance of one or more genera associated with oral health (Neisseria, Corynebacterium, Capnocytophaga, Actinomyces, Lautropia, Bergeyella, and Moraxella) than those fed chews. DL reduced Porphyromonas in SUP and SUB samples. DL and GR reduced Treponema in SUP samples. DL increased Corynebacterium in all sites of collection. BC increased Corynebacterium in SAL samples. DL and GR increased Neisseria in SAL samples. DL increased Actinomyces in the SUB sample. GR increased Actinomyces in SAL samples. Our results suggest that the dental chews tested in this study may aid in reducing periodontal disease risk in dogs by beneficially shifting the microbiota inhabiting plaque and saliva of a dog's oral cavity. These shifts occurred over a short period of time and were correlated with improved oral health scores.
Collapse
Affiliation(s)
- Patrícia M Oba
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Meredith Q Carroll
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Celeste Alexander
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Amy J Somrak
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Stephanie C J Keating
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Adrianna M Sage
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Kelly S Swanson
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.,Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.,Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| |
Collapse
|
6
|
Oba PM, Carroll MQ, Alexander C, Valentine H, Somrak AJ, Keating SCJ, Sage AM, Swanson KS. Correction to: Microbiota populations in supragingival plaque, subgingival plaque, and saliva habitats of adult dogs. Anim Microbiome 2021; 3:40. [PMID: 34082838 PMCID: PMC8176722 DOI: 10.1186/s42523-021-00102-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Patrícia M Oba
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, 1207 West Gregory Drive, 162 Animal Sciences Laboratory, Urbana, IL, 61801, USA
| | - Meredith Q Carroll
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, 1207 West Gregory Drive, 162 Animal Sciences Laboratory, Urbana, IL, 61801, USA
| | - Celeste Alexander
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Helen Valentine
- Division of Animal Resources, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Amy J Somrak
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL, 61801, USA
| | - Stephanie C J Keating
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL, 61801, USA
| | - Adrianna M Sage
- Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin - Madison, 2015 Linden Dr, Madison, WI, 53706, USA
| | - Kelly S Swanson
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, 1207 West Gregory Drive, 162 Animal Sciences Laboratory, Urbana, IL, 61801, USA. .,Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
| |
Collapse
|
7
|
Oba PM, Carroll MQ, Alexander C, Valentine H, Somrak AJ, Keating SCJ, Sage AM, Swanson KS. Microbiota populations in supragingival plaque, subgingival plaque, and saliva habitats of adult dogs. Anim Microbiome 2021; 3:38. [PMID: 34001282 PMCID: PMC8130298 DOI: 10.1186/s42523-021-00100-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Accepted: 04/30/2021] [Indexed: 02/01/2023] Open
Abstract
Background Oral diseases are common in dogs, with microbiota playing a prominent role in the disease process. Oral cavity habitats harbor unique microbiota populations that have relevance to health and disease. Despite their importance, the canine oral cavity microbial habitats have been poorly studied. The objectives of this study were to (1) characterize the oral microbiota of different habitats of dogs and (2) correlate oral health scores with bacterial taxa and identify what sites may be good options for understanding the role of microbiota in oral diseases. We used next-generation sequencing to characterize the salivary (SAL), subgingival (SUB), and supragingival (SUP) microbial habitats of 26 healthy adult female Beagle dogs (4.0 ± 1.2 year old) and identify taxa associated with periodontal disease indices. Results Bacterial species richness was highest for SAL, moderate for SUB, and lowest for SUP samples (p < 0.001). Unweighted and weighted principal coordinates plots showed clustering by habitat, with SAL and SUP samples being the most different from one another. Bacteroidetes, Proteobacteria, Firmicutes, Fusobacteria, Actinobacteria, and Spirochaetes were the predominant phyla in all habitats. Paludibacter, Filifactor, Peptostreptococcus, Fusibacter, Anaerovorax, Fusobacterium, Leptotrichia, Desulfomicrobium, and TG5 were enriched in SUB samples, while Actinomyces, Corynebacterium, Leucobacter, Euzebya, Capnocytophaga, Bergeyella, Lautropia, Lampropedia, Desulfobulbus, Enhydrobacter, and Moraxella were enriched in SUP samples. Prevotella, SHD-231, Helcococcus, Treponema, and Acholeplasma were enriched in SAL samples. p-75-a5, Arcobacter, and Pasteurella were diminished in SUB samples. Porphyromonas, Peptococcus, Parvimonas, and Campylobacter were diminished in SUP samples, while Tannerella, Proteocalla, Schwartzia, and Neisseria were diminished in SAL samples. Actinomyces, Corynebacterium, Capnocytophaga, Leptotrichia, and Neisseria were associated with higher oral health scores (worsened health) in plaque samples. Conclusions Our results demonstrate the differences that exist among canine salivary, subgingival plaque and supragingival plaque habitats. Salivary samples do not require sedation and are easy to collect, but do not accurately represent the plaque populations that are most important to oral disease. Plaque Actinomyces, Corynebacterium, Capnocytophaga, Leptotrichia, and Neisseria were associated with higher (worse) oral health scores. Future studies analyzing samples from progressive disease stages are needed to validate these results and understand the role of bacteria in periodontal disease development.
Collapse
Affiliation(s)
- Patrícia M Oba
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, 1207 West Gregory Drive, 162 Animal Sciences Laboratory, Urbana, IL, 61801, USA
| | - Meredith Q Carroll
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, 1207 West Gregory Drive, 162 Animal Sciences Laboratory, Urbana, IL, 61801, USA
| | - Celeste Alexander
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Helen Valentine
- Division of Animal Resources, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Amy J Somrak
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL, 61801, USA
| | - Stephanie C J Keating
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL, 61801, USA
| | - Adrianna M Sage
- Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin - Madison, 2015 Linden Dr, Madison, WI, 53706, USA
| | - Kelly S Swanson
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, 1207 West Gregory Drive, 162 Animal Sciences Laboratory, Urbana, IL, 61801, USA. .,Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
| |
Collapse
|
8
|
Alexander C, Cross TWL, Lee AH, Ly LK, Vieson MD, Ridlon JM, Nelson ER, Swanson KS. Development of a novel model of cholecystectomy in subsequently ovariectomized mice and characterization of metabolic and gastrointestinal phenotypes: a pilot study. BMC Gastroenterol 2021; 21:62. [PMID: 33573601 PMCID: PMC7879663 DOI: 10.1186/s12876-021-01648-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 01/20/2021] [Indexed: 11/29/2022] Open
Abstract
Background Cholecystectomy (XGB) is the most common abdominal surgery performed in the United States and is associated with an increased post-surgery incidence of metabolic and gastrointestinal (GI) diseases. Two main risk factors for XGB are sex (female) and age (40–50 yr), corresponding with onset of menopause. Post-menopausal estrogen loss alone facilitates metabolic dysfunction, but the effects of XGB on metabolic and GI health have yet to be investigated in this population. Study objectives were to (1) identify possible short-term effects of XGB and (2) develop a novel murine model of XGB in human menopause via subsequent ovariectomy (OVX) and assess longitudinal effects of OVX on metabolism, GI physiology, and GI microbiota in XGB mice. Methods Female C57BL/6 mice were utilized in two parallel studies (S1&S2). In S1, XGB mice were compared to a non-XGB baseline group after six wk. In S2, mice were XGB at wk0, either sham (SHM) or OVX at wk6, and sacrificed at wk12, wk18, and wk24. Body composition assessment and fresh fecal collections were conducted periodically. Serum and tissues were collected at sacrifice for metabolic and GI health endpoints. Results Compared to baseline, XGB increased hepatic CYP7A1 and decreased HMGCR relative expression, but did not influence BW, fat mass, or hepatic triglycerides after six wk. In S2, XGB/OVX mice had greater BW and fat mass than XGB/SHM. Cecal microbiota alpha diversity metrics were lower in XGB/OVX mice at wk24 compared the XGB/SHM. No consistent longitudinal patterns in fasting serum lipids, fecal microbial diversity, and GI gene expression were observed between S2 groups. Conclusions In addition to developing a novel, clinically-representative model of XGB and subsequent OVX, our results suggest that OVX resulted in the expected phenotype to some extent, but that XGB may modify or mask some responses and requires further investigation.
Collapse
Affiliation(s)
- Celeste Alexander
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA.
| | - Tzu-Wen L Cross
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA
| | - Anne H Lee
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Lindsey K Ly
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA
| | - Miranda D Vieson
- College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Jason M Ridlon
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA.,Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA.,Cancer Center at Illinois, University of Illinois at Urbana-Champaign, Urbana, IL, USA.,Carl R. Woese Institute for Genomic Biology, Anticancer Discovery from Pets to People Theme, University of Illinois Urbana-Champaign, IL, Urbana, USA
| | - Erik R Nelson
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA.,Cancer Center at Illinois, University of Illinois at Urbana-Champaign, Urbana, IL, USA.,Carl R. Woese Institute for Genomic Biology, Anticancer Discovery from Pets to People Theme, University of Illinois Urbana-Champaign, IL, Urbana, USA.,Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.,University of Illinois Cancer Center, University of Illinois at Chicago, Chicago, IL, USA
| | - Kelly S Swanson
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA. .,Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
| |
Collapse
|
9
|
Ruiter FAA, Sidney LE, Kiick KL, Segal JI, Alexander C, Rose FRAJ. The electrospinning of a thermo-responsive polymer with peptide conjugates for phenotype support and extracellular matrix production of therapeutically relevant mammalian cells. Biomater Sci 2021; 8:2611-2626. [PMID: 32239020 DOI: 10.1039/c9bm01965k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Current cell expansion methods for tissue engineering and regenerative medicine applications rely on the use of enzymatic digestion passaging and 2D platforms. However, this enzymatic treatment significantly reduces cell quality, due to the destruction of important cell-surface proteins. In addition, culture in 2D results in undesired de-differentiation of the cells caused by the lack of 3D similarity to the natural extracellular matrix (ECM) environment. Research has led to the development of thermo-responsive surfaces for the continuous culture of cells. These thermo-responsive materials properties can be used to passage cells from the surface when the cell culture temperature is reduced. Here we report the development of a PLA/thermo-responsive (PDEGMA) blend 3D electrospun fibre-based scaffold to create an enzymatic-free 3D cell culture platform for the expansion of mammalian cells with the desired phenotype for clinical use. Human corneal stromal cells (hCSCs) were used as an exemplar as they have been observed to de-differentiate to an undesirable myo-fibroblastic phenotype when cultured by conventional 2D cell culture methods. Scaffolds were functionalised with a cell adherence peptide sequence GGG-YIGSR by thiol-ene chemistry to improve cell adherence and phenotype support. This was obtained by functionalising the thermo-responsive polymer with a thiol (PDEGMA/PDEGSH) by co-polymerisation. These incorporated thiols react with the norbornene acid functionalised peptide (Nor-GGG-YIGSR) under UV exposure. Presence of the thiol in the scaffold and subsequent peptide attachment on the scaffolds were confirmed by fluorescence labelling, ToF-SIMS and XPS analysis. The biocompatibility of the peptide containing scaffolds was assessed by the adhesion, proliferation and immuno-staining of hCSCs. Significant increase in hCSC adherence and proliferation was observed on the peptide containing scaffolds. Immuno-staining showed maintained expression of the desired phenotypic markers ALDH, CD34 and CD105, while showing no or low expression of the undesired phenotype marker α-SMA. This desired expression was observed to be maintained after thermo-responsive passaging and higher when cells were cultured on PLA scaffolds with 10 wt% PDEGMA/4 mol% PDEGS-Nor-GGG-YIGSR. This paper describes the fabrication and application of a first generation, biocompatible peptide conjugated thermo-responsive fibrous scaffold. The ease of fabrication, successful adherence and expansion of a therapeutically relevant cell type makes these scaffolds a promising new class of materials for the application of cell culture expansion platforms in the biomaterials and tissue engineering field.
Collapse
Affiliation(s)
- F A A Ruiter
- School of Pharmacy, University of Nottingham, UK.
| | - L E Sidney
- Division of Clinical Neuroscience, University of Nottingham, UK.
| | - K L Kiick
- Department of Material Science and Engineering, University of Delaware, USA.
| | - J I Segal
- Faculty of Engineering, University of Nottingham, UK.
| | - C Alexander
- School of Pharmacy, University of Nottingham, UK.
| | - F R A J Rose
- School of Pharmacy, University of Nottingham, UK.
| |
Collapse
|
10
|
Carroll MQ, Oba PM, Sieja KM, Alexander C, Lye L, de Godoy MRC, He F, Somrak AJ, Keating SCJ, Sage AM, Swanson KS. Effects of novel dental chews on oral health outcomes and halitosis in adult dogs. J Anim Sci 2020; 98:5897404. [PMID: 32845313 DOI: 10.1093/jas/skaa274] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 08/20/2020] [Indexed: 11/14/2022] Open
Abstract
Periodontal disease (PD) is the most common clinical condition occurring in adult dogs. The objective of this study was to evaluate the benefits of daily dental chew administration on oral health outcomes in adult dogs. Twelve adult (mean age = 5.31 ± 1.08 yr; mean BW = 13.12 ± 1.39 kg) female beagle dogs were used in a replicated 4 × 4 Latin square design consisting of 28-d periods. On day 0 of each period, teeth were cleaned by a veterinary dentist blinded to treatments. Teeth then were scored for plaque, calculus, and gingivitis by the same veterinary dentist on day 28 of each period. Breath samples were measured for malodor (volatile sulfur compounds) on days 1, 7, 14, 21, and 27 of each period. All dogs consumed the same commercial dry diet throughout the study. Control dogs were offered the diet only (CT), while treatment groups received the diet plus one of three dental chews. Two novel chews (Bones & Chews Dental Treats [BC]; Chewy, Inc., Dania Beach, FL and Dr. Lyon's Grain-Free Dental Treats [DL]; Dr. Lyon's, LLC, Dania Beach, FL) and a leading brand chew (Greenies Dental Treats [GR]; Mars Petcare US, Franklin, TN) were tested. Each day, one chew was provided 4 h after mealtime. All tooth scoring data were analyzed using the Mixed Models procedure of SAS (version 9.4; SAS Institute, Cary, NC). Halimeter data were analyzed using repeated measures using the Mixed Models procedure of SAS and testing for differences due to treatment, time, and treatment * time interaction. Data are reported as LS means ± SEM with statistical significance set at P < 0.05. DL performed at the same level as the leading brand, GR, as both resulted in lower (P < 0.05) plaque coverage and thickness scores, calculus coverage scores, and day 27 volatile sulfur concentrations compared with CT. Additionally, DL reduced (P < 0.05) volatile sulfur compounds on day 14 when compared with CT. BC reduced (P < 0.05) calculus coverage and day 27 volatile sulfur concentrations compared with CT. Our results suggest that the dental chews tested in this study may help slow the development and/or progression of PD in dogs.
Collapse
Affiliation(s)
- Meredith Q Carroll
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL
| | - Patricia M Oba
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL
| | - Kelly M Sieja
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL
| | - Celeste Alexander
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL
| | | | - Maria R C de Godoy
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL.,Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL
| | - Fei He
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL
| | - Amy J Somrak
- College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL
| | - Stephanie C J Keating
- College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL
| | - Adrianna M Sage
- College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL
| | - Kelly S Swanson
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL.,Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL.,College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL
| |
Collapse
|
11
|
Oba PM, Carroll M, Alexander C, Lye L, Somrak A, Keating S, Sage A, Swanson KS. 87 President Oral Presentation Pick: Oral Microbiota Populations of Adult Dogs Consuming Dental Chews Demonstrated to Reduce Dental Plaque and Calculus. J Anim Sci 2020. [DOI: 10.1093/jas/skaa278.111] [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: 11/14/2022] Open
Abstract
Abstract
Microbiota play a prominent role in canine periodontal disease, but little is known about the oral microbial community of dogs. We aimed to determine the differences in oral microbiota of dogs consuming dental chews demonstrated to improve oral health outcomes. Twelve adult dogs were used in a replicated 4x4 Latin square design consisting of 28-day periods. Control (CT) dogs consumed diet only, with treatment groups receiving one of three dental chews (BC, DL and GR). At baseline, teeth were cleaned. Teeth were scored for plaque, calculus, and gingivitis at the end of each period by a veterinary dentist blinded to treatments. Breath samples were measured for sulfur compounds throughout each period. Plaque [supragingival (SUP) and subgingival (SUB) plaque] and saliva (SAL) samples were collected for microbiota analysis. Total DNA from saliva and plaque samples was extracted, with 16S rDNA V4 region gene amplicons subjected to Illumina sequencing. Data were analyzed using QIIME 2 and SAS. CT dogs had a higher pocket score, breath sulfur concentrations, and plaque and calculus scores compared to those given chews. Bacterial species richness was highest for CT, with unweighted and weighted PCoA plots showed a clustering of CT dogs vs. those given chews. For all sample types, CT dogs had higher relative abundance of potential pathogenic bacteria (Porphyromonas, Tannerella, and Treponema) and lower relative abundance of bacterial genera associated with oral health (Neisseria, Corynebacterium, Bergeyella, and Moraxella) compared to those given chews. DL reduced Porphyromonas in SUP and SUB samples. DL and GR reduced Treponema in SUP samples. DL increased Corynebacterium in all sample types. BC increased Corynebacterium in SAL samples. DL and GR increased Neisseria and Moraxella in SAL samples. Our results suggest that the dental chews tested beneficially shifted oral microbiota populations, which were associated with improvements in plaque and calculus scores.
Collapse
Affiliation(s)
| | | | | | | | - Amy Somrak
- University of Illinois at Urbana-Champaign
| | | | | | | |
Collapse
|
12
|
Pezzali JG, Acuff HL, Henry W, Alexander C, Swanson KS, Aldrich CG. Effects of different carbohydrate sources on taurine status in healthy Beagle dogs. J Anim Sci 2020; 98:5707092. [PMID: 31943028 PMCID: PMC7007769 DOI: 10.1093/jas/skaa010] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 01/12/2020] [Indexed: 12/20/2022] Open
Abstract
This study evaluated the effects of a grain-based (GB) and grain-free (GF) diet on protein utilization and taurine status in healthy Beagle dogs. Two practical dog diets sufficient in crude protein, sulfur amino acids, and taurine content were formulated with the same ingredients with exception of the carbohydrate sources. The GB contained sorghum, millet, and spelt while potatoes, peas, and tapioca starch were used in the GF. A total of 12 Beagle dogs were used in a completely randomized design with six replicates per treatment. The study consisted of an adaptation period of 2 wk followed by an experimental period of 28 d in which GB and GF were fed to the dogs. At the end of the adaptation period and every 2 wk after it (day 0, day 14, day 28), markers of taurine metabolism were analyzed in whole blood (taurine), plasma (taurine, methionine, and cystine), urine (taurine:creatinine), and fresh fecal samples (primary and secondary bile acids). Fecal samples were collected during the last 6 d of experimental period for digestibly assessment using titanium dioxide as an external marker. Taurine markers and digestibility data were analyzed in a repeated measures model and one-way ANOVA, respectively, using PROC GLIMMIX in SAS (version 9.4). Apparent crude protein digestibility was not affected by treatment, but dogs fed GF diet had lower apparent organic matter digestibility compared with those fed GB (P < 0.05). Greater plasma taurine concentrations were observed at days 14 and 28 compared with day 0; wherein dogs fed GF exhibited greater increase compared to those fed GB (P < 0.05). Whole blood taurine concentrations, plasma methionine concentrations, and urinary taurine:creatinine were also greater at days 14 and 28 compared with day 0 (P < 0.05), but no effect of diet was observed. Total bile acid excretion was similar between GF and GB groups, but dogs fed GF excreted a higher proportion of primary bile acids compared with those fed GB (25.49% vs. 12.09% at day 28, respectively). In summary, overall taurine status was not affected by dietary treatments, however, our results suggest that the higher content of oligosaccharides and soluble fibers in the GF diet may alter the composition of the fecal bile acid pool.
Collapse
Affiliation(s)
| | - Heather L Acuff
- Department of Grain Science and Industry, Kansas State University, Manhattan, KS
| | - Will Henry
- Director of Product Innovation, Extru-Tech, Inc., Sabetha, KS
| | - Celeste Alexander
- Division of Nutritional Sciences, University of Illinois, Urbana, IL
| | - Kelly S Swanson
- Division of Nutritional Sciences, University of Illinois, Urbana, IL.,Department of Animal Sciences, University of Illinois, Urbana, IL
| | - Charles G Aldrich
- Department of Grain Science and Industry, Kansas State University, Manhattan, KS
| |
Collapse
|
13
|
Pezzali JG, Acuff HL, Alexander C, Swanson KS, Aldrich CG. 242 Effects of different carbohydrate sources on taurine status in healthy Beagle dogs. J Anim Sci 2019. [DOI: 10.1093/jas/skz258.126] [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: 11/12/2022] Open
Abstract
Abstract
Consumption of grain-free (GF) diets has recently been linked to canine dilated cardiomyopathy in selected dog breeds. Soluble fiber present in GF carbohydrate sources may be contributing to taurine depletion, thus affecting heart health. The objective of this study was to evaluate the effects of different carbohydrate sources on taurine status in healthy Beagle dogs. Two practical diets sufficient in sulfur-amino acids and taurine were formulated with the same proportion of carbohydrate sources: a grain-based (GB) containing sorghum, millet, and spelt, and a GF containing peas, potatoes and tapioca starch. Twelve Beagle dogs were fed experimental diets for 4-wk in a randomized complete block design. The morning prior to feeding experimental diets (baseline) and two and four weeks after, markers of taurine metabolism were analyzed in blood, urine, and fresh fecal samples. Data were analyzed as a change from baseline in a repeated measures model by GLIMMIX (SAS, version 9.4) in which the main effects of time, diet, and their interaction were evaluated. Greater concentrations of taurine in plasma (158 vs. 117 nmol/mL) and whole blood (254 vs. 234 nmol/mL) were observed during experimental period compared to baseline. An increase in plasma methionine was also observed during experimental period compared to baseline (64 vs. 57nmol/mL). Dogs fed GF exhibited higher plasma taurine concentration compared to those fed GB (181 vs. 138 nmol/mL). There were no significant effects of diet, time, or their interaction on plasma cystine concentration, urinary taurine:creatinine ratio, or total fecal bile acid (BA) excretion (P > 0.05). However, dogs fed GF had greater fecal primary BA (26 vs 14%) as a proportion of total BA compared to those fed GB. This study suggests that GF diets do not impair taurine blood concentration, but the increased proportion of fecal primary BA may decrease recycling of taurine through enterohepatic circulation.
Collapse
Affiliation(s)
| | - Heather L Acuff
- Department of Grain Science and Industry, Kansas State University
| | - Celeste Alexander
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign
| | | | | |
Collapse
|
14
|
Gill N, Arklay-Lehman S, Alexander C, Atkinson S, Goudey K, Harrigan K, Lamb J, Roach K, White M. A PROVINCIAL REGISTRY TO FACILITATE QUALITY IMPROVEMENT RELATED TO DOOR TO NEEDLE TIME IN NOVA SCOTIA. Can J Cardiol 2019. [DOI: 10.1016/j.cjca.2019.07.435] [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: 10/25/2022] Open
|
15
|
Alexander C, Suhr J. C-10 Interaction of ApoE4 and Gender in Neuropsychiatric Presentation in Probable Alzheimer’s Disease. Arch Clin Neuropsychol 2019. [DOI: 10.1093/arclin/acz034.172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Objective
Individuals with probable Alzheimer’s disease (pAD) often have neuropsychiatric symptoms; however, the relationship of these symptoms and ApoE4 status is unclear. Recent research suggests gender moderates the relationship of ApoE4 to AD. We examined how ApoE4 genetic status and gender predict neuropsychiatric symptoms in older adults with pAD.
Method
Data from the National Alzheimer’s Coordinating Centers (NACC) was utilized in the present study. We included only individuals diagnosed with pAD with collaterals who were judged reliable by clinical NACC staff and who saw the participant at least three times per week. The selected sample (N = 6943) was 52% male; 85.6% White, 10.2% African American; and 7.5% Hispanic. Average age was 73 years. The Neuropsychiatric Inventory-Questionnaire, completed by the participant’s collateral, was used to assess symptoms. Analyses controlled for age and cognitive impairment as measured by the Mini-Mental State Examination.
Results
The presence of at least one ApoE4 allele predicted higher severity of delusions, p = .04. Males had higher severity of agitation, apathy, and irritability; females had higher delusions, depression, and anxiety, all p’s < .05. Gender moderated the relationship of ApoE4 with disinhibition, night disturbances, and appetite, all p’s < .05. In all three cases, for males, scores were higher for non-carriers than for ApoE4 carriers; however, for females, differences did not exist between carriers and non-carriers.
Conclusions
Differences between ApoE4 carriers and non-carriers as well as between genders are demonstrated, and evidence supports the hypothesis that gender and ApoE4 status interact to predict some pAD neuropsychiatric symptomatology.
Collapse
|
16
|
Alexander C, Swanson KS, Fahey GC, Garleb KA. Perspective: Physiologic Importance of Short-Chain Fatty Acids from Nondigestible Carbohydrate Fermentation. Adv Nutr 2019; 10:576-589. [PMID: 31305907 PMCID: PMC6628845 DOI: 10.1093/advances/nmz004] [Citation(s) in RCA: 108] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 01/03/2019] [Accepted: 01/07/2019] [Indexed: 12/14/2022] Open
Abstract
In recent years, it has become increasingly obvious that dietary fiber or nondigestible carbohydrate (NDC) consumption is critical for maintaining optimal health and managing symptoms of metabolic disease. In accordance with this, the US FDA released its first official definition of dietary fiber in 2016 for regulation of Nutrition and Supplement Facts labels. Included in this definition is the requirement of an isolated or synthetic NDC to produce an accepted physiologic health benefit, such as improved laxation or reduced fasting cholesterol concentrations, upon consumption. Even though NDC fermentation and production of short-chain fatty acids elicit many physiologic effects, including serving as a source of energy for colonocytes, curbing glycemic response and satiety, promoting weight loss, enhancing mineral absorption, reducing systemic inflammation, and improving intestinal health, the process of fermentation is not considered a physiologic endpoint. Instead, expensive and laborious clinical trials must be conducted and an accepted physiologic benefit observed. In this review, we discuss the physiologic importance of NDC fermentation through extensive examination of clinical evidence and propose that the degree of fermentability of an NDC, rather than the endpoints of a clinical trial, may be appropriate for classifying it as a dietary fiber.
Collapse
Affiliation(s)
- Celeste Alexander
- Division of Nutritional Sciences,Abbott Nutrition, Columbus, OH,Address correspondence to CA (e-mail: )
| | - Kelly S Swanson
- Division of Nutritional Sciences,Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL
| | - George C Fahey
- Division of Nutritional Sciences,Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL
| | - Keith A Garleb
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL,Abbott Nutrition, Columbus, OH
| |
Collapse
|
17
|
Lin CY, Alexander C, Steelman AJ, Warzecha CM, de Godoy MRC, Swanson KS. Effects of a Saccharomyces cerevisiae fermentation product on fecal characteristics, nutrient digestibility, fecal fermentative end-products, fecal microbial populations, immune function, and diet palatability in adult dogs1. J Anim Sci 2019; 97:1586-1599. [PMID: 30770927 DOI: 10.1093/jas/skz064] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [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: 12/07/2018] [Accepted: 02/12/2019] [Indexed: 12/11/2022] Open
Abstract
Yeast products may serve as functional ingredients due to their benefits on host health but vary greatly in source, composition, and functionality, justifying research in host species of interest. In this study, a Saccharomyces cerevisiae fermentation product (SCFP) was investigated as a dietary supplement for adult dogs. Adult female beagles (n = 12; mean age = 3.3 ± 0.8 yr; mean BW = 10.3 ± 0.68 kg) were fed the same diet, but supplemented with three levels of SCFP (125, 250, and 500 mg/d) or a placebo (sucrose) via gelatin capsules in a replicated 4 × 4 Latin square design. Fecal samples for nutrient digestibility, fecal characteristics and microbial populations as well as blood samples for immune indices were collected after a 21-d adaptation phase in each period. A separate palatability test was conducted to examine palatability of an SCFP-containing diet (0.2% of diet). All data, except for palatability data, were analyzed by Mixed Models procedure of SAS (version 9.4). A paired t-test was conducted to analyze data from the palatability test. Supplementation of SCFP did not affect total tract apparent macronutrient and energy digestibilities or fecal characteristics. Fecal phenol and total phenol + indole concentrations decreased linearly with SCFP dosage (P < 0.05). Relative abundance of Bifidobacterium was greater (P < 0.05), while Fusobacterium was lower (P < 0.05) in SCFP-supplemented dogs. Total white blood cell counts were decreased by SCFP (P < 0.05). The percentage of natural killer cells and antigen-presenting cells were not altered by SCFP. However, when comparing control vs. all SCFP treatments, SCFP-supplemented dogs had greater (P < 0.05) major histocompatibility complex class II presenting B cell and monocyte populations than control dogs. IFN-γ secreting helper and cytotoxic T cells increased linearly with SCFP consumption (P < 0.05). Immune cells derived from SCFP-supplemented dogs produced less (P < 0.05) TNF-α than those from control dogs when cells were stimulated with agonists of toll-like receptors 2, 3, 4, and 7/8. A linear increase (P < 0.05) in serum IgE with SCFP dosage was noted. In the palatability test, a 1.9:1 consumption ratio was observed for the SCFP-containing diet vs. control diet, demonstrating a preference (P < 0.05) for SCFP. Results of this study suggest that SCFP supplementation may be beneficial to adult dogs by positively altering gut microbiota, enhancing immune capacity and reducing inflammation.
Collapse
Affiliation(s)
- Ching-Yen Lin
- Division of Nutritional Sciences, University of Illinois, Urbana, IL
| | - Celeste Alexander
- Division of Nutritional Sciences, University of Illinois, Urbana, IL
| | - Andrew J Steelman
- Division of Nutritional Sciences, University of Illinois, Urbana, IL.,Department of Animal Sciences, University of Illinois, Urbana, IL
| | | | - Maria R C de Godoy
- Division of Nutritional Sciences, University of Illinois, Urbana, IL.,Department of Animal Sciences, University of Illinois, Urbana, IL
| | - Kelly S Swanson
- Division of Nutritional Sciences, University of Illinois, Urbana, IL.,Department of Animal Sciences, University of Illinois, Urbana, IL
| |
Collapse
|
18
|
Alexander C, Ridlon J, Swanson K. Cholecystectomy and Postprandial Psyllium Husk Fiber Consumption Alter the Gastrointestinal Microbiota Community in a Post-menopausal Mouse Model (P20-028-19). Curr Dev Nutr 2019. [DOI: 10.1093/cdn/nzz040.p20-028-19] [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: 11/13/2022] Open
Abstract
Abstract
Objectives
Cholecystectomy (XGB), removal of the gallbladder, is the most common abdominal surgery performed in the United States. Individuals can survive without a gallbladder, but have an increased prevalence of gastrointestinal (GI) cancers and small intestinal bacterial overgrowth. However, little is known about the impact of XGB on the composition and functional capacity of the GI microbiota. We hypothesized that constant flow of bile in the GI tract following XGB would alter the microbiota community. We developed a model of XGB in ovariectomized (OVX) mice because the main XGB risk factors, age (40–50 yr) and sex (female), correspond with the onset of menopause. Additionally, psyllium husk (PH) fiber possesses strong bile acid (BA)-binding capacity. Thus, the objectives of this study were to assess the impact of XGB on the composition and functional capacity of the GI microbiota, and the ability of post-prandial PH intervention to curb these effects in XGB/OVX mice.
Methods
Twelve-wk-old female C57BL/6 J mice (N = 48) were fed a high-fat (45% kcal) diet for the entire study (16 wk). Ad libitum access to food was provided 15 hr/d. A 2x2 (surgery x diet) factorial design was used, resulting in four groups. XGB and sham (SHM) operations were performed at wk 0 and all mice were OVX at wk 4. SHM/FS and XGB/FS mice were fasted (FS) the remaining 9 hr/d while SHM/PH and XGB/PH mice had ad libitum access to PH pellets. Fresh fecal samples were collected throughout and cecal digesta was collected at sacrifice for microbiota composition and functional capacity using 16S rDNA sequencing and targeted qPCR, respectively.
Results
Cecal alpha diversity was greater in the XGB/PH group compared to both SHM groups (P < 0.01). Cecal Lactobacillus relative abundance was lower in PH mice compared to FS (P < 0.01). Relative abundance of cecal Lactococcus and Streptococcus were greater in XGB mice compared to SHM (P = 0.01, P = 0.02). Erysipelotrichaceae relative abundance was lower in XGB mice compared to SHM. At wk 16, PH mice had a greater reduction from baseline in fecal Akkermansia relative abundance compared to FS (P = 0.04).
Conclusions
XGB and post-prandial PH consumption increase GI microbiota species richness and alter several abundant taxa.
Funding Sources
University of Illinois Division of Nutritional Sciences Vision 20/20 grant program.
Collapse
|
19
|
Alexander C, Guard BC, Suchodolski JS, Swanson KS. Cholestyramine decreases apparent total tract macronutrient digestibility and alters fecal characteristics and metabolites of healthy adult dogs. J Anim Sci 2019; 97:1020-1026. [PMID: 30423121 PMCID: PMC6396232 DOI: 10.1093/jas/sky437] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 11/12/2018] [Indexed: 01/01/2023] Open
Abstract
Absorption of dietary lipids in the small intestine is dependent on the emulsification by bile acids (BA) and the formation of chylomicrons. Cholestyramine is a common drug used in humans-and potentially dogs-to treat BA malabsorption associated with chronic diarrhea. It is known to bind BA to form insoluble complexes, preventing their reabsorption and possibly proper emulsification and absorption of dietary fats. The objective of this study was to evaluate the effects of cholestyramine on 1) macronutrient apparent total tract digestibility (ATTD), and 2) fecal characteristics and metabolites of healthy adult dogs. We hypothesized that cholestyramine would decrease ATTD of fat and organic matter (OM), increase fecal dry matter (DM) content, and increase fecal output. Twelve healthy beagles (3.2 ± 0.8 yr; 10.4 ± 0.9 kg) were used in a randomized crossover design. All procedures were approved by the University of Illinois Institutional Animal Care and Use Committee before the study. The study included a baseline period and two 14-d experimental periods separated by a 14-d washout. All dogs were fed the same experimental diet, formulated to meet all nutrient needs recommended by AAFCO, throughout the study. Dogs were randomized into 2 groups [diet only (control) or diet + 11.4 g/d cholestyramine (8 g/d active ingredient)] in Period 1 and received the other treatment in Period 2. During the washout, all dogs were fed the diet only. Dogs were fed once daily (0800 h) to maintain BW. Total fecal output was collected during the last 4 d of each period for ATTD analysis. On day 14 of each of period, fresh fecal and blood samples were collected for metabolite analysis. Dogs fed cholestyramine had lower (P < 0.001) ATTD of DM, OM, energy, crude protein, and fat and lower (P < 0.01) fecal scores (firmer stools) than controls. Dogs fed cholestyramine had greater (P < 0.01) as-is and dry fecal output than controls. Dogs fed cholestyramine had lower (P < 0.05) fecal ammonia and phenol concentrations, but greater (P < 0.05) fecal indole, acetate, butyrate, and total short-chain fatty acid concentrations than controls. Fecal DM% and pH were greater (P < 0.01) in dogs fed cholestyramine. Our results indicate that cholestyramine, when given with a meal, is safe and well tolerated but significantly decreases nutrient digestibility and alters fecal characteristics. Future studies are required to explore the effects of cholestyramine on dogs with gastrointestinal disease.
Collapse
Affiliation(s)
- Celeste Alexander
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Animal Sciences Laboratory, Urbana, IL
| | - Blake C Guard
- Gastrointestinal Laboratory, Texas A&M University, College Station, TX
| | - Jan S Suchodolski
- Gastrointestinal Laboratory, Texas A&M University, College Station, TX
| | - Kelly S Swanson
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Animal Sciences Laboratory, Urbana, IL
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL
| |
Collapse
|
20
|
Simmonds S, Alexander C, Mercer C, Ridehalgh C. Comparison of sleeper stretch versus glenohumeral joint mobilisation on range of movement of 3 posterior shoulder tests in asymptomatic participants. Physiotherapy 2019. [DOI: 10.1016/j.physio.2018.11.217] [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: 10/27/2022]
|
21
|
Barber L, Alexander C, Shipman P, Boyd R, Reid S, Elliott C. Validity and reliability of a freehand 3D ultrasound system for the determination of triceps surae muscle volume in children with cerebral palsy. J Anat 2018; 234:384-391. [PMID: 30525186 DOI: 10.1111/joa.12927] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/20/2018] [Indexed: 11/30/2022] Open
Abstract
This study assessed the validity, intra-rater and inter-rater reliability of segmentation of in vivo medial gastrocnemius (MG), lateral gastrocnemius (LG) and soleus (SOL) muscle volume measurement using a single sweep freehand 3D ultrasound (3DUS) in children with cerebral palsy (CP). The MG, LG and SOL of both limbs of 18 children with CP (age 8 years 4 months ± 1 year 10 months, 11 males, unilateral CP = 9, bilateral CP = 9, Gross Motor Functional Classification System I = 11, II = 7) were scanned using freehand 3DUS and magnetic resonance imaging (MRI). All freehand 3DUS and MRI images were segmented and volumes rendered by two raters. Validity was assessed using limits of agreement method. Intra-rater and inter-rater reliability was assessed using intra-class correlation (ICC), coefficient of variance (CV) and minimal detectable change (MDC). Freehand 3DUS overestimated muscle volume of the MG and LG by < 0.3 mL (1%) and underestimated SOL by < 1.3 mL (1.5%) compared with MRI. ICCs for intra-rater reliability of the segmentation process for the freehand 3DUS system and MRI for muscle volume were > 0.98 and 0.99, respectively, for all muscles. ICCs for inter-rater reliability of the segmentation process for freehand 3DUS and MRI volumes were > 0.96 and 0.98, respectively, for all muscles. MDCs for single rater freehand 3DUS and MRI were < 4.0 mL (14%) and 3.2 mL (11%), respectively, in all muscles. Freehand 3DUS is a valid and reliable method for the measurement of lower leg muscle volume that can be measured with a single sweep in children with CP in vivo. It can be used as an alternative to MRI for the detection of clinically relevant changes in calf muscle volume as the result of growth and interventions.
Collapse
Affiliation(s)
- L Barber
- School of Health, Medical and Applied Sciences, Central Queensland University, Bundaberg, QLD, Australia.,Child Health Research Centre, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia
| | - C Alexander
- School of Sport Science, Exercise and Health, University of Western Australia, Perth, WA, Australia
| | - P Shipman
- Diagnostic Imaging, Princess Margaret Hospital, Subiaco, WA, Australia
| | - R Boyd
- Child Health Research Centre, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia
| | - S Reid
- School of Sport Science, Exercise and Health, University of Western Australia, Perth, WA, Australia
| | - C Elliott
- School of Occupational Therapy, Social Work and Speech Pathology, Faculty of Health Sciences, Curtin University, Perth, WA, Australia
| |
Collapse
|
22
|
Gorczynski RM, Alexander C, Brandenburg K, Chen Z, Heini A, Neumann D, Mach JP, Rietschel ET, Terskikh A, Ulmer AJ, Yu K, Zahringer U, Khatri I. Corrigendum to "An altered REDOX environment, assisted by over-expression of fetal hemoglobins, protects from inflammatory colitis and reduces inflammatory cytokine expression" [Int. Immunopharmacol. 50 (2017) 69-76]. Int Immunopharmacol 2018; 59:414. [PMID: 29681495 DOI: 10.1016/j.intimp.2018.04.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- R M Gorczynski
- Institute of Medical Sciences, University of Toronto, Toronto, Canada.
| | - C Alexander
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - K Brandenburg
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - Z Chen
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - A Heini
- Clinique La Prairie, Clarens, Montreux, Switzerland
| | - D Neumann
- Clinique La Prairie, Clarens, Montreux, Switzerland
| | - J P Mach
- Department of Biochemistry, University of Lausanne, Switzerland
| | | | - A Terskikh
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - A J Ulmer
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - Kai Yu
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - U Zahringer
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - I Khatri
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| |
Collapse
|
23
|
Kos O, Alexander C, Brandenburg K, Chen Z, Heini A, Heumann D, Khatri I, Mach JP, Rietschel ET, Terskikh A, Ulmer AJ, Waelli T, Yu K, Zähringer U, Gorczynski RM. Corrigendum to "Regulation of fetal hemoglobin expression during hematopoietic stem cell development and its importance in bone metabolism and osteoporosis" [Int. Immunopharmacol. 57 (2018) 112-120]. Int Immunopharmacol 2018; 59:413. [PMID: 29681496 DOI: 10.1016/j.intimp.2018.04.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- O Kos
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - C Alexander
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - K Brandenburg
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - Z Chen
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - A Heini
- Clinique La Prairie, Clarens-Montreux, Switzerland
| | - D Heumann
- Clinique La Prairie, Clarens-Montreux, Switzerland
| | - I Khatri
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - J P Mach
- Department of Biochemistry, University of Lausanne, Switzerland
| | | | - A Terskikh
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - A J Ulmer
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - T Waelli
- Clinique La Prairie, Clarens-Montreux, Switzerland
| | - K Yu
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - U Zähringer
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - R M Gorczynski
- Institute of Medical Sciences, University of Toronto, Toronto, Canada.
| |
Collapse
|
24
|
Kos O, Alexander C, Brandenburg K, Chen Z, Heini A, Heumann D, Khatri I, Mach JP, Rietschel ET, Terskikh A, Ulmer AJ, Waelli T, Yu K, Zähringer U, Gorczynski RM. Regulation of fetal hemoglobin expression during hematopoietic stem cell development and its importance in bone metabolism and osteoporosis. Int Immunopharmacol 2018; 57:112-120. [PMID: 29477972 DOI: 10.1016/j.intimp.2018.02.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 02/07/2018] [Accepted: 02/13/2018] [Indexed: 11/19/2022]
Abstract
We have shown that an altered tissue redox environment in mice lacking either murine beta Hemoglobin major (HgbβmaKO) or minor (HgbβmiKO) regulates inflammation. The REDOX environment in marrow stem cell niches also control differentiation pathways. We investigated osteoclastogenesis (OC)/osteoblastogenesis (OB), in bone cultures derived from untreated or FSLE-treated WT, HgbβmaKO or HgbβmiKO mice. Marrow mesenchymal cells from 10d pre-cultures were incubated on an osteogenic matrix for 21d prior to analysis of inflammatory cytokine release into culture supernatants, and relative OC:OB using (TRAP:BSP, RANKL:OPG) mRNA expression ratios and TRAP or Von Kossa staining. Cells from WT and HgbβmaKO mice show decreased IL-1β,TNFα and IL-6 production and enhanced osteoblastogenesis with altered mRNA expression ratios and increased bone nodules (Von Kossa staining) in vitro after in vivo stimulation of mRNA expression of fetal Hgb genes (Hgbε and Hgbβmi) by a fetal liver extract (FSLE). Marrow from HgbβmiKO showed enhanced cytokine release and preferential enhanced osteoclastogenesis relative to similar cells from WT or HgbβmaKO mice, with no increased osteoblastogenesis after mouse treatment with FSLE. Pre-treatment of WT or HgbβmaKO, but not HgbβmiKO mice, with other molecules (rapamycin; hydroxyurea) which increase expression of fetal Hgb genes also augmented osteoblastogenesis and decreased cytokine production in cells differentiating in vitro. Infusion of rabbit anti- Hgbε or anti- Hgbβmi, but not anti-Hgbα or anti- Hgbβma into WT mice from day 13 gestation for 3 weeks led to attenuated osteoblastogenesis in cultured cells. We conclude that increased fetal hemoglobin expression, or use of agents which improve fetal hemoglobin expression, increases osteoblast bone differentiation in association with decreased inflammatory cytokine release.
Collapse
Affiliation(s)
- O Kos
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - C Alexander
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - K Brandenburg
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - Z Chen
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - A Heini
- Clinique La Prairie, Clarens-Montreux, Switzerland
| | - D Heumann
- Clinique La Prairie, Clarens-Montreux, Switzerland
| | - I Khatri
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - J P Mach
- Department of Biochemistry, University of Lausanne, Switzerland
| | | | - A Terskikh
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California, USA
| | - A J Ulmer
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - T Waelli
- Clinique La Prairie, Clarens-Montreux, Switzerland
| | - K Yu
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - U Zähringer
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - R M Gorczynski
- Institute of Medical Sciences, University of Toronto, Toronto, Canada.
| |
Collapse
|
25
|
Abstract
ZusammenfassungEs wird über Erfahrungen mit dem 99mTc-markierten monoklonalen Antikörper BW 250/183 zum Entzündungsnachweis berichtet. Die Validisierung erfolgte an 160 von 354 untersuchten Patienten. Es ergab sich mit einer Sensitivität von 91 % und einer Spezifität von 82% eine hohe diagnostische Treffsicherheit. Ein in 72 Fällen durchgeführter Vergleich zwischen konventioneller 3-Phasen-Knochenszintigraphie und der Granulozytenszintigraphie ergab einen positiven immunszintigraphischen Entzündungsnachweis in 76% der positiven Knochenszintigramme. Bei 84 Erstuntersuchten und 6 Zweituntersuchten wurden die HAMA-Titer 1 bis 12 Monate nach Applikation untersucht. Es zeigte sich bei den Zweituntersuchten lediglich 1 Patient mit einem mäßig erhöhten HAMA-Titer. Hieraus wird der Schluß gezogen, daß der monoklonale Antikörper BW 250/183 sehr gut zum szintigraphischen Entzündungsnachweis geeignet ist.
Collapse
|
26
|
Alexander C, Burton FL, Kelly A, Smith GL, Myles RC. 4Insights into the mechanisms of triggered activity during long qt conditions in the intact heart using optical mapping. Europace 2017. [DOI: 10.1093/europace/eux283.144] [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
|
27
|
Ruiter FAA, Alexander C, Rose FRAJ, Segal JI. A design of experiments approach to identify the influencing parameters that determine poly-D,L-lactic acid (PDLLA) electrospun scaffold morphologies. ACTA ACUST UNITED AC 2017. [PMID: 28643700 DOI: 10.1088/1748-605x/aa7b54] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Electrospun fibrous materials have increasing applications in regenerative medicine due to the similarity of fibre constructs to the morphology of certain extracellular matrices. Although experimentally the electrospinning method is relatively simple, at the theoretical level the interactions between process parameters and their influence on the fibre morphology is not yet fully understood. Here, we hypothesised that a design of experiments (DoE) model could determine combinations of process parameters that result in significant effects on poly-D,L-lactic acid (PDLLA) fibre morphology. The process parameters used in this study were applied voltage, needle-to-collector distance, flow rate and polymer concentration. Data obtained for mean fibre diameter, standard deviation (SD) of the fibre diameter (measure of fibre morphology) and presence of 'beading' on the fibres (beads per μm2) were evaluated as a measure of PDLLA fibre morphology. Uniform fibres occurred at SDs of ≤500 nm, 'beads-on-string' morphologies were apparent between ±500 and 1300 nm and large beads were observed at ±1300-1800 nm respectively. Mean fibre diameter was significantly influenced by the applied voltage and interaction between flow rate and polymer concentration. Fibre morphology was mainly influenced by the polymer concentration, while bead distribution was significantly influenced by the polymer concentration as well as the flow rate. The resultant DoE model regression equations were tested and considered suitable for the prediction of parameters combinations needed for desired PDLLA fibre diameter and additionally provided information regarding the expected fibre morphology.
Collapse
Affiliation(s)
- F A A Ruiter
- School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | | | | | | |
Collapse
|
28
|
Gorczynski R, Alexander C, Brandenburg K, Chen Z, Heini A, Neumann D, Mach J, Rietschel E, Tersikh A, Ulmer A, Yu K, Zahringer U, Khatri I. An altered REDOX environment, assisted by over-expression of fetal hemoglobins, protects from inflammatory colitis and reduces inflammatory cytokine expression. Int Immunopharmacol 2017. [DOI: 10.1016/j.intimp.2017.06.003] [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: 12/16/2022]
|
29
|
Brazzale C, Mastrotto F, Moody P, Watson PD, Balasso A, Malfanti A, Mantovani G, Caliceti P, Alexander C, Jones AT, Salmaso S. Control of targeting ligand display by pH-responsive polymers on gold nanoparticles mediates selective entry into cancer cells. Nanoscale 2017; 9:11137-11147. [PMID: 28745764 DOI: 10.1039/c7nr02595e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Selective targeting of cells for intracellular delivery of therapeutics represents a major challenge for pharmaceutical intervention in disease. Here we show pH-triggered receptor-mediated endocytosis of nanoparticles via surface ligand exposure. Gold nanoparticles were decorated with two polymers: a 2 kDa PEG with a terminal folate targeting ligand, and a di-block copolymer including a pH-responsive and a hydrophilic block. At the normal serum pH of 7.4, the pH-responsive block (apparent pKa of 7.1) displayed a hydrophilic extended conformation, shielding the PEG-folate ligands, which inhibited cellular uptake of the nanoparticles. Under pH conditions resembling those of the extracellular matrix around solid tumours (pH 6.5), protonation of the pH-responsive polymer triggered a coil-to-globule polymer chain contraction, exposing folate residues on the PEG chains. In line with this, endocytosis of folate-decorated polymer-coated gold nanoparticles in cancer cells overexpressing folate receptor was significantly increased at pH 6.5, compared with pH 7.4. Thus, the tumour acidic environment and high folate receptor expression were effectively exploited to activate cell binding and endocytosis of these nanoparticles. These data provide proof-of-concept for strategies enabling extracellular pH stimuli to selectively enhance cellular uptake of drug delivery vectors and their associated therapeutic cargo.
Collapse
Affiliation(s)
- C Brazzale
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, via F. Marzolo 5, 35131 Padova, Italy.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Zigova T, Pencea V, Betarbet R, Wiegand SJ, Alexander C, Bakay RA, Luskin MB. Neuronal Progenitor Cells of the Neonatal Subventricular Zone Differentiate and Disperse following Transplantation into the Adult Rat Striatum. Cell Transplant 2017; 7:137-56. [PMID: 9588596 DOI: 10.1177/096368979800700209] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We have investigated the suitability of a recently identified and characterized population of neuronal progenitor cells for their potential use in the replacement of degenerating or damaged neurons in the mammalian brain. The unique population of neuronal progenitor cells is situated in a well-delineated region of the anterior part of the neonatal subventricular zone (referred to as SVZa). This region can be separated from the remaining proliferative, gliogenic, subventricular zone encircling the lateral ventricles of the forebrain. Because the neurons arising from the highly enriched neurogenic progenitor cell population of the SVZa ordinarily migrate considerable distances and ultimately express the neurotransmitters GABA and dopamine, we have examined whether they could serve as an alternative source of tissue for neural transplantation. SVZa cells from postnatal day 0-2 rats, prelabeled by intraperitoneal injections of the cell proliferation marker BrdU, were implanted into the striatum of adult rats approximately 1 mo after unilateral denervation by 6-OHDA. To examine the spatio-temporal distribution and phenotype of the transplanted SVZa cells, the experimental recipients were perfused at short (less than 1 wk), intermediate (2-3 wk) and long (5 mo) postimplantation times. The host brains were sectioned and stained with an antibody to BrdU and one of several cell-type specific markers to determine the phenotypic characteristics of the transplanted SVZa cells. To identify neurons we used the neuron-specific antibody TuJ1, or antimembrane-associated protein 2 (MAP-2), and anti-GFAP was used to identify astrocytic glia. At all studied intervals the majority of the surviving SVZa cells exhibited a neuronal phenotype. Moreover, morphologically they could be distinguished from the cells of the host striatum because they resembled the intrinsic granule cells of the olfactory bulb, their usual fate. At longer times, a greater number of the transplanted SVZa cells had migrated from their site of implantation, often towards an outlying blood vessel, and the density of cells within the core of the transplant was reduced. Furthermore, there were rarely signs of transplant rejection or a glial scar surrounding the transplant. In the core of the transplant there were low numbers of GFAP-positive cells, indicating that the transplanted SVZa cells, predominantly TuJ1-positive/MAP2-positive, express a neuronal phenotype. Collectively, the propensity of the SVZa cells to express a neuronal phenotype and to survive and integrate in the striatal environment suggest that they may be useful in the reconstruction of the brain following CNS injury or disease.
Collapse
Affiliation(s)
- T Zigova
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | | | | | | | | | | | | |
Collapse
|
31
|
Alexander C, Burton FL, Kelly A, Smith GL, Myles RC. 577Prominent phase I repolarisation during IKr block correlates with EAD occurrence and incidence of Torsades de Pointes in isolated rabbit hearts. Europace 2017. [DOI: 10.1093/ehjci/eux142.002] [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
|
32
|
Sparks J, Alexander C, Lenneman A, Trivedi J, Slaughter M. Transplantation in Adults with Congenital Heart Disease: A Special Exception. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.435] [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: 10/19/2022] Open
|
33
|
Blanco-Fernandez B, Concheiro A, Makwana H, Fernandez-Trillo F, Alexander C, Alvarez-Lorenzo C. Dually sensitive dextran-based micelles for methotrexate delivery. RSC Adv 2017. [DOI: 10.1039/c7ra00696a] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Temperature and pH-sensitive micelles prepared from dextran grafted with poly(N-isopropylacrylamide) (PNIPAAm)/polyethylene glycol methyl ether (PEGMA) with/without 2-aminoethylmethacrylate (2-AEM) were evaluated as methotrexate delivery systems.
Collapse
Affiliation(s)
- B. Blanco-Fernandez
- Departamento de Farmacia y Tecnología Farmacéutica
- R+DPharma Group (GI-1645)
- Facultad de Farmacia
- Universidade de Santiago de Compostela
- 15782 Santiago de Compostela
| | - A. Concheiro
- Departamento de Farmacia y Tecnología Farmacéutica
- R+DPharma Group (GI-1645)
- Facultad de Farmacia
- Universidade de Santiago de Compostela
- 15782 Santiago de Compostela
| | - H. Makwana
- School of Pharmacy
- University of Nottingham
- University Park
- Nottingham NG7 2RD
- UK
| | - F. Fernandez-Trillo
- School of Pharmacy
- University of Nottingham
- University Park
- Nottingham NG7 2RD
- UK
| | - C. Alexander
- School of Pharmacy
- University of Nottingham
- University Park
- Nottingham NG7 2RD
- UK
| | - C. Alvarez-Lorenzo
- Departamento de Farmacia y Tecnología Farmacéutica
- R+DPharma Group (GI-1645)
- Facultad de Farmacia
- Universidade de Santiago de Compostela
- 15782 Santiago de Compostela
| |
Collapse
|
34
|
Donnelly CJ, Alexander C, Pataky TC, Stannage K, Reid S, Robinson MA. Vector-field statistics for the analysis of time varying clinical gait data. Clin Biomech (Bristol, Avon) 2017; 41:87-91. [PMID: 28024228 DOI: 10.1016/j.clinbiomech.2016.11.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 03/29/2016] [Revised: 09/09/2016] [Accepted: 11/28/2016] [Indexed: 02/07/2023]
Abstract
BACKGROUND In clinical settings, the time varying analysis of gait data relies heavily on the experience of the individual(s) assessing these biological signals. Though three dimensional kinematics are recognised as time varying waveforms (1D), exploratory statistical analysis of these data are commonly carried out with multiple discrete or 0D dependent variables. In the absence of an a priori 0D hypothesis, clinicians are at risk of making type I and II errors in their analyis of time varying gait signatures in the event statistics are used in concert with prefered subjective clinical assesment methods. The aim of this communication was to determine if vector field waveform statistics were capable of providing quantitative corroboration to practically significant differences in time varying gait signatures as determined by two clinically trained gait experts. METHODS The case study was a left hemiplegic Cerebral Palsy (GMFCS I) gait patient following a botulinum toxin (BoNT-A) injection to their left gastrocnemius muscle. FINDINGS When comparing subjective clinical gait assessments between two testers, they were in agreement with each other for 61% of the joint degrees of freedom and phases of motion analysed. For tester 1 and tester 2, they were in agreement with the vector-field analysis for 78% and 53% of the kinematic variables analysed. When the subjective analyses of tester 1 and tester 2 were pooled together and then compared to the vector-field analysis, they were in agreement for 83% of the time varying kinematic variables analysed. INTERPRETATION These outcomes demonstrate that in principle, vector-field statistics corroborates with what a team of clinical gait experts would classify as practically meaningful pre- versus post time varying kinematic differences. The potential for vector-field statistics to be used as a useful clinical tool for the objective analysis of time varying clinical gait data is established. Future research is recommended to assess the usefulness of vector-field analyses during the clinical decision making process.
Collapse
Affiliation(s)
- C J Donnelly
- School of Sport Science, Exercise and Health, The University of Western Australia, Perth, WA, Australia.
| | - C Alexander
- School of Sport Science, Exercise and Health, The University of Western Australia, Perth, WA, Australia
| | - T C Pataky
- Department of Bioengineering, Shinshu University, Japan
| | - K Stannage
- Department of Orthopaedics, Princess Margaret Hospital for Children, Perth, WA, Australia
| | - S Reid
- School of Sport Science, Exercise and Health, The University of Western Australia, Perth, WA, Australia
| | - M A Robinson
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, UK
| |
Collapse
|
35
|
Abstract
The data presented in this paper form part of an action-research project commissioned jointly by the New South Wales Department of Corrective Services and the Ministry of Aboriginal Affairs in 1985. The major aims of this research were to investigate the chief causes and the rate of Aboriginal recidivism as well as making recommendations as to what kind of post-release support schemes would prove efficient, effective and useful. In the course of the research, the archival records of 154 Aboriginal prisoners released from New South Wales gaols during the first six months of 1983 were analysed. Furthermore, 30 New South Wales State Government Officers and Aboriginal service providers as well as 68 Aboriginal ex-inmates and 100 Aboriginal inmates were interviewed. The information presented in this paper is based mainly on an analysis of some answers given to us by the 68 Aboriginal ex-inmates and 100 Aboriginal inmates. The 68 Aboriginal ex-inmates interviewed resided in Canberra, Grafton, Maitland, Queanbeyan and Sydney. The interviews with the 100 Aboriginal prisoners were held in the following prisons: Bathurst, Cessnock, Glen Innes, Goulburn, Grafton, Maitland, Mulawa, Long Bay and Oberon.
Collapse
|
36
|
Alexander C, Abzug JM, Johnson AJ, Pensy RA, Eglseder WA, Paryavi E. Motorcyclist's thumb: carpometacarpal injuries of the thumb sustained in motorcycle crashes. J Hand Surg Eur Vol 2016; 41:707-9. [PMID: 26642850 DOI: 10.1177/1753193415620186] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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: 03/05/2015] [Accepted: 09/30/2015] [Indexed: 02/03/2023]
Abstract
UNLABELLED The purpose of this study was to investigate motorcycle crash thumb injury patterns. We hypothesized that ulnar collateral ligament injuries at the thumb metacarpophalangeal joint would be most common and there would be a side predilection due to the clutch and brake positions. Motorcyclist admissions following injury between 2002 and 2013 were reviewed, and phalangeal and metacarpal injuries treated acutely identified. Demographics, injury, and treatment characteristics were recorded. Association between laterality and injury type was assessed. Of 128 patients, 59 underwent acute treatment for thumb injuries. Eleven patients sustained thumb ulnar collateral ligament injuries; 27 sustained thumb carpometacarpal injuries. Most carpometacarpal injuries were fracture-dislocations (19/27). Thumb carpometacarpal injuries had no overall side predilection; ulnar collateral ligament injuries occurred more on the right. Carpometacarpal fractures and dislocations are the most frequent motorcycle crash thumb injury, probably due to the mechanics of gripping handlebars and the high-energy force directed into the palm and against the metacarpal base. LEVEL OF EVIDENCE Level IV.
Collapse
Affiliation(s)
- C Alexander
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, MD, USA
| | - J M Abzug
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, MD, USA
| | - A J Johnson
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, MD, USA
| | - R A Pensy
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, MD, USA
| | - W A Eglseder
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, MD, USA
| | - E Paryavi
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, MD, USA The Curtis National Hand Center, MedStar Union Memorial Hospital, Baltimore, MD, USA
| |
Collapse
|
37
|
Hart U, Wildner M, Krämer D, Alexander C. Evaluation von Fördermaßnahmen in Kindertageseinrichtungen im Landkreis Biberach – eine Analyse von Daten aus der Einschulungsuntersuchung Baden-Württemberg. Gesundheitswesen 2016. [DOI: 10.1055/s-0036-1578869] [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: 10/22/2022]
|
38
|
Taresco V, Creasey R, Kennon J, Mantovani G, Alexander C, Burley J, Garnett M. Variation in structure and properties of poly(glycerol adipate) via control of chain branching during enzymatic synthesis. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.02.036] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
39
|
Magennis EP, Hook AL, Davies MC, Alexander C, Williams P, Alexander MR. Engineering serendipity: High-throughput discovery of materials that resist bacterial attachment. Acta Biomater 2016; 34:84-92. [PMID: 26577984 PMCID: PMC4824014 DOI: 10.1016/j.actbio.2015.11.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2015] [Revised: 10/23/2015] [Accepted: 11/06/2015] [Indexed: 12/31/2022]
Abstract
Controlling the colonisation of materials by microorganisms is important in a wide range of industries and clinical settings. To date, the underlying mechanisms that govern the interactions of bacteria with material surfaces remain poorly understood, limiting the ab initio design and engineering of biomaterials to control bacterial attachment. Combinatorial approaches involving high-throughput screening have emerged as key tools for identifying materials to control bacterial attachment. The hundreds of different materials assessed using these methods can be carried out with the aid of computational modelling. This approach can develop an understanding of the rules used to predict bacterial attachment to surfaces of non-toxic synthetic materials. Here we outline our view on the state of this field and the challenges and opportunities in this area for the coming years. Statement of significance This opinion article on high throughput screening methods reflects one aspect of how the field of biomaterials research has developed and progressed. The piece takes the reader through key developments in biomaterials discovery, particularly focusing on need to reduce bacterial colonisation of surfaces. Such bacterial resistant surfaces are increasingly required in this age of antibiotic resistance. The influence and origin of high-throughput methods are discussed with insights into the future of biomaterials development where computational methods may drive materials development into new fertile areas of discovery. New biomaterials will exhibit responsiveness to adapt to the biological environment and promote better integration and reduced rejection or infection.
Collapse
Affiliation(s)
- E P Magennis
- Laboratory of Biophysics and Surface Analysis, School of Pharmacy, University of Nottingham, Nottingham, UK.
| | - A L Hook
- Laboratory of Biophysics and Surface Analysis, School of Pharmacy, University of Nottingham, Nottingham, UK.
| | - M C Davies
- Laboratory of Biophysics and Surface Analysis, School of Pharmacy, University of Nottingham, Nottingham, UK.
| | - C Alexander
- Drug Delivery and Tissue Engineering, School of Pharmacy, University of Nottingham, Nottingham, UK.
| | - P Williams
- School of Molecular Medical Sciences, University of Nottingham, Nottingham, UK.
| | - M R Alexander
- Laboratory of Biophysics and Surface Analysis, School of Pharmacy, University of Nottingham, Nottingham, UK.
| |
Collapse
|
40
|
England RM, Hare JI, Kemmitt PD, Treacher KE, Waring MJ, Barry ST, Alexander C, Ashford M. Enhanced cytocompatibility and functional group content of poly(l-lysine) dendrimers by grafting with poly(oxazolines). Polym Chem 2016. [DOI: 10.1039/c6py00478d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the use of polyoxazolines as materials for modifying the surface of a generation 5 l-lysine dendrimer resulting in a significant improvement in the biocompatibility properties compared to the unmodified dendrimer. The polyoxazoline coatings represent interesting alternatives to polyethylene glycol and can also offer an opportunity for increasing drug loading.
Collapse
Affiliation(s)
| | - J. I. Hare
- AstraZeneca
- Oncology iMed
- Alderley Park
- Macclesfield
- UK
| | | | - K. E. Treacher
- AstraZeneca
- Pharmaceutical Technology and Development
- Macclesfield
- UK
| | - M. J. Waring
- AstraZeneca
- Oncology iMed
- Alderley Park
- Macclesfield
- UK
| | - S. T. Barry
- AstraZeneca
- Oncology iMed
- Alderley Park
- Macclesfield
- UK
| | | | - M. Ashford
- AstraZeneca
- Pharmaceutical Science
- Innovative Medicines
- Silk Court Business Park
- Macclesfield
| |
Collapse
|
41
|
Braim SA, Shakesheff KM, Saunders BR, Alexander C. Thermoresponsive magnetic colloidal gels via surface-initiated polymerisation from functional microparticles. J Mater Chem B 2016; 4:962-972. [DOI: 10.1039/c5tb01739d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Novel magnetothermally responsive core–shell microparticles have been synthesized.
Collapse
Affiliation(s)
- S. A. Braim
- School of Pharmacy
- University of Nottingham
- Nottingham
- UK
| | | | | | - C. Alexander
- School of Pharmacy
- University of Nottingham
- Nottingham
- UK
| |
Collapse
|
42
|
Mastrotto F, Breen AF, Sicilia G, Murdan S, Johnstone AD, Marsh GE, Grainger-Boultby C, Russell NA, Alexander C, Mantovani G. One-pot RAFT and fast polymersomes assembly: a ‘beeline’ from monomers to drug-loaded nanovectors. Polym Chem 2016. [DOI: 10.1039/c6py01292b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A ‘fast RAFT’ strategy that allows the engineering of drug-containing polymer vesicles in only a few hours, starting from functional monomers.
Collapse
Affiliation(s)
| | - A. F. Breen
- School of Pharmacy
- University of Nottingham
- UK
| | - G. Sicilia
- School of Pharmacy
- University of Nottingham
- UK
| | - S. Murdan
- Department of Pharmaceutics
- UCL School of Pharmacy
- University College London
- London
- UK
| | - A. D. Johnstone
- Faculty of Engineering
- University of Nottingham
- Nottingham NG7 2RD
- UK
| | - G. E. Marsh
- School of Pharmacy
- University of Nottingham
- UK
| | | | - N. A. Russell
- Faculty of Engineering
- University of Nottingham
- Nottingham NG7 2RD
- UK
| | | | | |
Collapse
|
43
|
Salmon K, Johnson D, Underberger C, Hill D, Surrey M, Danzer H, Ghadir S, Chang W, Alexander C, Barritt J. Time-lapse video analysis demonstrates laser-assisted hatching of ∼33% of the zona-pellucida after blastocyst warming significantly improves an embryo’s ability to fully hatch. Fertil Steril 2015. [DOI: 10.1016/j.fertnstert.2015.07.583] [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: 11/29/2022]
|
44
|
Smith M, Johnson D, Hill D, Surrey M, Ghadir S, Chang W, Danzer H, Alexander C, Munne S, Barritt J. Increased incidence of mosaicism among biopsied trophectoderm cells analyzed by Next Generation Sequencing. Fertil Steril 2015. [DOI: 10.1016/j.fertnstert.2015.07.859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
45
|
Bibring JP, Taylor MGGT, Alexander C, Auster U, Biele J, Finzi AE, Goesmann F, Klingelhoefer G, Kofman W, Mottola S, Seidensticker KJ, Spohn T, Wright I. Philae's first look. Philae's First Days on the Comet. Introduction. Science 2015; 349:493. [PMID: 26228139 DOI: 10.1126/science.aac5116] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- J-P Bibring
- Institut d'Astrophysique Spatiale, Orsay, France
| | - M G G T Taylor
- European Space Research and Technology Centre, Noordwijk, Netherlands
| | - C Alexander
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA, deceased
| | - U Auster
- Institute for Geophysics and Extraterrestrial Physics, TU-Braunschweig, Germany
| | - J Biele
- DLR RB-MUSC, Cologne, Germany
| | | | - F Goesmann
- Max Planck Institute for Solar System Research, Göttingen, Germany
| | | | - W Kofman
- Institut de Planétologie et d'Astrophysique de Grenoble, Grenoble, France
| | - S Mottola
- DLR, Institute of Planetary Research, Berlin, Germany
| | | | - T Spohn
- DLR, Institute of Planetary Research, Berlin, Germany
| | - I Wright
- Open University, Milton Keynes, UK
| |
Collapse
|
46
|
To M, Alexander C. AB1237-HPR Do People with Joint Hypermobility Syndrome and Anterior Knee Pain Struggle to Strengthen their Quadriceps at the Same Rate As People Who Are Equally Flexible? Preliminary Results. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.3926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
47
|
Mackenzie R, Booth J, Alexander C, Garnett MC, Laughton CA. Multiscale Modeling of Drug–Polymer Nanoparticle Assembly Identifies Parameters Influencing Drug Encapsulation Efficiency. J Chem Theory Comput 2015; 11:2705-13. [DOI: 10.1021/ct501152a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
| | - J. Booth
- Pharmaceutical
Development, AstraZeneca, Macclesfield SK10 2NA, United Kingdom
| | | | | | | |
Collapse
|
48
|
Alexander C. Pioneers of the final frontier. Science 2015. [DOI: 10.1126/science.aaa8008] [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: 11/02/2022]
|
49
|
Taylor MGGT, Alexander C, Altobelli N, Fulle M, Fulchignoni M, Grün E, Weissman P. Catching a comet. Rosetta begins its comet tale. Introduction. Science 2015; 347:387. [PMID: 25613884 DOI: 10.1126/science.aaa4542] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- M G G T Taylor
- European Space Research and Technology Centre, Science and Robotic Exploration Directorate, European Space Agency, Noordwijk, Netherlands.
| | - C Alexander
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - N Altobelli
- European Space Astronomy Centre, Science and Robotic Exploration Directorate, European Space Agency, Madrid, Spain
| | - M Fulle
- INAF-Osservatorio Astronomico, Trieste, Italy
| | - M Fulchignoni
- Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris, France
| | - E Grün
- Max-Planck-Institut für Kernphysik, Heidelberg, Germany
| | - P Weissman
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| |
Collapse
|
50
|
Brower M, Hill D, Danzer H, Surrey M, Ghadir S, Chang W, Wambach C, Alexander C, Barritt J. “No diagnosis” embryos after PGS should not be discarded: rebiopsy and reanalysis demonstrate the majority are euploid. Fertil Steril 2014. [DOI: 10.1016/j.fertnstert.2014.07.114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|