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- W2051696360 abstract "Although information regarding insulin secretion usually is considered equivalent when generated in the mouse or the rat, it is established that the kinetics of insulin secretion from mouse and rat pancreatic beta cells differ. The mechanisms underlining these differences are not understood. The in vitro perfused pancreas and isolated islets of the mouse or rat were employed in this study to investigate the role of cyclic adenosine monophosphate (cAMP), a major positive modulator of beta-cell function, as one differentiating signal for the uniquely different insulin release from the beta cells of these commonly used rodents. Glucose-stimulated first-phase insulin release from the perfused pancreas of the rat was higher than the mouse when calculated per gram of pancreas or as fractional secretion, but this phase was identical in the two species when results were adjusted for total body weight. Whether related to insulin content, pancreatic weight or body weight, the rat pancreas responded to glucose with a progressively increasing second-phase insulin release compared to the mouse pancreas, which secreted a flat second-phase of lesser magnitude. Isolated islets from rat and mouse were comparable in insulin content whereas the basal cAMP level of mouse islets was less than half that of the rat. At submaximal stimulation with glucose or glucose + IBMX or forskolin, mouse islets exhibited lower cAMP levels to a given stimulus than the rat. In rat islets cAMP levels increased to approximately 1000 fmol per islet, although insulin secretion maximized by 100-150 fmol.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2051696360 title "Differences in insulin secretion between the rat and mouse: role of cAMP" @default.
- W2051696360 doi "https://doi.org/10.1530/eje.0.1320370" @default.
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