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- W4242021645 abstract "The present study was to test the hypothesis that the reactivity of the adrenal medulla to pituitary adenylate cyclase activating polypeptide 1-27 (PACAP27) is enhanced during insulin-induced hypoglycemia (IIH) in anesthetized dogs. Plasma catecholamine (CA) concentrations in adrenal venous and aortic blood were determined by an HPLC method coupled with electrochemical detection, and the plasma glucose concentration in aortic blood was measured using a glucometer. PACAP27 (25 ng) was administered locally via the adrenolumbar artery to the left adrenal gland. The resulting CA responses were compared before and during IIH following an intravenous bolus injection of insulin (0.15 IU/kg, iv). In the first group with normal adrenal innervation, the basal adrenal CA secretion gradually increased, reaching a maximum level 45 min after the insulin injection. The net increase in PACAP27-induced CA secretion was significantly greater 30, 45, and 60 min after the induction of hypoglycemia, compared with the initial net response to PACAP27 observed before insulin injection. In the second group receiving local adrenal denervation, neither the basal CA secretion nor the net CA response to PACAP27 significantly increased despite the presence of IIH, which developed to an extent similar to that found in the first group. In the third group, which was the normoglycemic control group, both the basal CA secretion and the net CA response to PACAP27 remained unchanged during the experimental period. The results indicate that the adrenomedullary reactivity to PACAP27 was significantly enhanced during IIH only when the sympathoadrenal system was activated. The present study suggests that PACAP27 may play a beneficial role in glucose counterregulatory mechanisms in the adrenal medulla during hypoglycemia.Key words: catecholamine, counterregulation, denervation, secretion, splanchnic, sympathoadrenal." @default.
- W4242021645 created "2022-05-12" @default.
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- W4242021645 date "1999-10-15" @default.
- W4242021645 modified "2023-10-05" @default.
- W4242021645 title "Enhanced reactivity of the adrenal medulla in response to pituitary adenylate cyclase activating polypeptide1-27 (PACAP) during insulin-induced hypoglycemia in anesthetized dogs" @default.
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- W4242021645 doi "https://doi.org/10.1139/y99-084" @default.
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