BACKGROUND.: The original Edmonton protocol used fresh islets, but for obvious logistic advantages most transplant centers have implemented pretransplant culture in human albumin. The aim of this study was to improve current pretransplant human islet culture techniques. METHODS.: Clinical-grade purified human islets from a total of 24 donors were directly resuspended after isolation in CMRL 1066-based media at 37 degrees C, and media additions and renewal were tested. At days 1 and 5 of culture, in vitro quality controls included islet viability, insulin content and function, apoptosis, and in vivo islet potency assay in nude mice. RESULTS.: Replacing human albumin with human AB serum improved 1- and 5-day preservation of islet function and viability which was further enhanced with antioxidant Stem Ease, leading to the iCulture medium (enriched CMRL: pyruvate, zinc sulfate, insulin, transferrin, selenium, 2.5% human AB serum and Stem Ease). Major damage occurs in the first day of culture and frequent media renewal (25% vol/hr) in this period further improved viability, apoptosis, islet recovery, and function in vitro and in vivo, compared with only changing medium after overnight culture. CONCLUSIONS.: The described human islet culture technique (iCulture medium+renewal) seems to be the best choice for clinical human islet culture when short (1 day) or long (5 days) periods are used. Media choice and dilution play a major role in the function and survival of human islets in culture.
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http://dx.doi.org/10.1097/TP.0b013e3181d154ac | DOI Listing |
Alzheimers Dement
December 2024
University of Colorado School of Medicine, Aurora, CO, USA.
Background: Varicella zoster virus (VZV) reactivation, manifesting as herpes zoster, increases dementia risk. Herein, we review the literature supporting the biological plausibility of VZV contributing to AD pathologies and examine the unique ability of VZV to induce amylin that has been found in blood vessels and parenchyma of AD patients.
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January 2025
Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope, Duarte, CA, USA.
Herein, we characterized the percentage of tacrolimus to the combined sirolimus and tacrolimus trough levels (tacrolimus %) observed during islet transplant-associated immune suppression therapy with post-transplant skin cancer. Although trough levels of tacrolimus and sirolimus were not different ( = 0.79, 0.
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January 2025
State Key Laboratory of Marine Food Processing & Safety Control, College of Food Science and Engineering, Ocean University of China, Qingdao 266404, China; Qingdao Marine Science and Technology Center, Qingdao, Shandong Province 266235, China.
The neurotoxin β-methylamino-L-alanine (BMAA) produced by cyanobacteria is widely present in foods and dietary supplements, posing a significant threat to human health. Ganglioside GM1 (GM1) has demonstrated potential for treating neurodegenerative diseases; however, its ability to prevent BMAA-induced neurotoxicity remains uncertain. In this study, zebrafish embryos were treated with Ganglioside GM1 to investigate its neuroprotective effects against BMAA exposure and the underlying mechanisms.
View Article and Find Full Text PDFFront Immunol
January 2025
Department of Immunology, School of Medicine, Yangtze University, Jingzhou, China.
Type 1 diabetes (T1D) is a metabolic disorder caused by a complete lack of insulin, primarily manifested by hyperglycemia. The mechanisms underlying the onset of T1D are complex, involving genetics, environment, and various unknown factors, leading to the infiltration of various immune components into the islets. Besides T cells, B cells are now considered important contributors to the pathogenesis of T1D, according to recent studies.
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