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• W2118898405 abstract "OBJECTIVE Insulin released by the β-cell is thought to act locally to regulate glucagon secretion. The possibility that insulin might also act centrally to modulate islet glucagon secretion has received little attention. RESEARCH DESIGN AND METHODS Initially the counterregulatory response to identical hypoglycemia was compared during intravenous insulin and phloridzin infusion in awake chronically catheterized nondiabetic rats. To explore whether the disparate glucagon responses seen were in part due to changes in ventromedial hypothalamus (VMH) exposure to insulin, bilateral guide cannulas were inserted to the level of the VMH and 8 days later rats received a VMH microinjection of either 1) anti-insulin affibody, 2) control affibody, 3) artificial extracellular fluid, 4) insulin (50 μU), 5) insulin receptor antagonist (S961), or 6) anti-insulin affibody plus a γ-aminobutyric acid A (GABAA) receptor agonist muscimol, prior to a hypoglycemic clamp or under baseline conditions. RESULTS As expected, insulin-induced hypoglycemia produced a threefold increase in plasma glucagon. However, the glucagon response was fourfold to fivefold greater when circulating insulin did not increase, despite equivalent hypoglycemia and C-peptide suppression. In contrast, epinephrine responses were not altered. The phloridzin-hypoglycemia induced glucagon increase was attenuated (40%) by VMH insulin microinjection. Conversely, local VMH blockade of insulin amplified glucagon twofold to threefold during insulin-induced hypoglycemia. Furthermore, local blockade of basal insulin levels or insulin receptors within the VMH caused an immediate twofold increase in fasting glucagon levels that was prevented by coinjection to the VMH of a GABAA receptor agonist. CONCLUSIONS Together, these data suggest that insulin's inhibitory effect on α-cell glucagon release is in part mediated at the level of the VMH under both normoglycemic and hypoglycemic conditions." @default.
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• W2118898405 date "2010-03-18" @default.
• W2118898405 modified "2023-10-14" @default.
• W2118898405 title "Influence of Insulin in the Ventromedial Hypothalamus on Pancreatic Glucagon Secretion In Vivo" @default.
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• W2118898405 doi "https://doi.org/10.2337/db10-0014" @default.
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