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- W2433605549 abstract "The neurosecretory responses of the isolated rat hypothalamus were assessed in vitro. Rat hypothalamic blocks were incubated for 30 min in a N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid-buffered salt solution with 5.5 mM glucose (base-line collection period). The blocks were transferred to fresh buffer with a new concentration of glucose with or without various additions (test period); corticotropin-releasing factor (CRF) and other hormones in the media were determined by radioimmunoassay. CRF secretion was maximally increased to approximately 200% of base line at glucose concentrations less than 4 mM and decreased to 65% of base line at higher glucose concentrations. The increase in CRF secretion at low glucose (0.55 or 1.38 mM) was Ca2+ dependent and completely reversible. Hexamethonium, cyproheptadine, and atropine partially blocked the CRF response to 0.55 mM glucose. Glucose concentrations from 0 to 11 mM had no effect on the CRF response to 47.5 mM KCl. The inhibitory effects of high glucose were completely reversed by the addition of 2-deoxy-D-glucose (3-49 mM). Glucose levels did not alter secretion of either gonadotropin-releasing hormone or arginine vasopressin from hypothalamic blocks. The results suggest that the isolated rat hypothalamus is extremely sensitive to the level of glucose and that CRF is rapidly and reversibly secreted in response to slight reductions in glucose concentrations. These concentrations are consistent with those observed during moderate to severe hypoglycemia in vivo. The rise in glucocorticoids observed in vivo during hypoglycemia may result at least in part from the ability of the hypothalamus to directly sense glucose levels and promote secretion of CRF." @default.
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- W2433605549 date "1988-09-01" @default.
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- W2433605549 title "Regulation of corticotropin-releasing factor secretion in vitro by glucose" @default.
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- W2433605549 doi "https://doi.org/10.1152/ajpendo.1988.255.3.e287" @default.
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