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• W2063639069 abstract "Acute effects of nutrient stimuli on pancreatic beta-cell function are widely reported; however, the chronic effects of insulinotropic amino acids, such as L-alanine, on pancreatic beta-cell function and integrity are unknown. In the present study, the effects of prolonged exposure (24 h) to the amino acid L-alanine on insulin secretory function, gene expression and pro-inflammatory cytokine-induced apoptosis were studied using clonal BRIN-BD11 cells. Expression profiling of BRIN-BD11 cells chronically exposed to L-alanine was performed using oligonucleotide microarray analysis. The effect of alanine, the iNOS (inducible nitric oxide synthase) inhibitor NMA (N(G)-methyl-L-arginine acetate) or the iNOS and NADPH oxidase inhibitor DPI (diphenylene iodonium) on apoptosis induced by a pro-inflammatory cytokine mix [IL-1beta (interleukin-1beta), TNF-alpha (tumour necrosis factor-alpha) and IFN-gamma (interferon-gamma)] was additionally assessed by flow cytometry. Culture for 24 h with 10 mM L-alanine resulted in desensitization to the subsequent acute insulin stimulatory effects of L-alanine. This was accompanied by substantial changes in gene expression of BRIN-BD11 cells. Sixty-six genes were up-regulated >1.8-fold, including many involved in cellular signalling, metabolism, gene regulation, protein synthesis, apoptosis and the cellular stress response. Subsequent functional experiments confirmed that L-alanine provided protection of BRIN-BD11 cells from pro-inflammatory cytokine-induced apoptosis. Protection from apoptosis was mimicked by NMA or DPI suggesting L-alanine enhances intracellular antioxidant generation. These observations indicate important long-term effects of L-alanine in regulating gene expression, secretory function and the integrity of insulin-secreting cells. Specific amino acids may therefore play a key role in beta-cell function in vivo." @default.
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• W2063639069 date "2005-10-24" @default.
• W2063639069 modified "2023-09-26" @default.
• W2063639069 title "<scp>L</scp>-Alanine induces changes in metabolic and signal transduction gene expression in a clonal rat pancreatic β-cell line and protects from pro-inflammatory cytokine-induced apoptosis" @default.
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• W2063639069 doi "https://doi.org/10.1042/cs20050149" @default.
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