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• W2056558888 abstract "Defects in pancreatic β-cell function and survival are key components in type 2 diabetes (T2D). An age-dependent deterioration in β-cell function has also been observed, but little is known about the molecular mechanisms behind this phenomenon. Our previous studies indicate that the regulation of cytoplasmic free Ca2+ concentration ([Ca2+]i) may be critical and that this is dependent on the proper function of the mitochondria. The [Ca2+]i dynamics of the pancreatic β-cell are driven by an interplay between glucose-induced influx of extracellular Ca2+ via voltage-dependent Ca2+ channels and the inositol 1,4,5-trisphosphate (Ins(1,4,5)P3)-mediated liberation of Ca2+ from intracellular stores. Our previous work has indicated a direct relationship between disruption of Ins(1,4,5)P3-mediated Ca2+ regulation and loss of β-cell function, including disturbed [Ca2+]i dynamics and compromised insulin secretion. To investigate these processes in aging we used three mouse models, a premature aging mitochondrial mutator mouse, a mature aging phenotype (C57BL/6) and an aging-resistant phenotype (129). Our data suggest that age-dependent impairment in mitochondrial function leads to modest changes in [Ca2+]i dynamics in mouse β-cells, particularly in the pattern of [Ca2+]i oscillations. These changes are driven by modifications in both PLC/Ins(1,4,5)P3-mediated Ca2+ mobilization from intracellular stores and decreased β-cell Ca2+ influx over the plasma membrane. Our findings underscore an important concept, namely that even relatively small, time-dependent changes in β-cell signal-transduction result in compromised insulin release and in a diabetic phenotype." @default.
• W2056558888 created "2016-06-24" @default.
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• W2056558888 date "2015-01-01" @default.
• W2056558888 modified "2023-10-03" @default.
• W2056558888 title "β-Cell Ca2+ dynamics and function are compromised in aging" @default.
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• W2056558888 doi "https://doi.org/10.1016/j.jbior.2014.09.005" @default.
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