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- W2099651657 abstract "Leptin has recently been shown to have a stimulatory effect on basal GH secretion. However, the mechanisms by which leptin exert this effect are not yet clear. GHRH and GH-releasing peptide (GHRP)-6 are the two most potent GH secretagogues described to date.To determine if leptin could also enhance in vivo GH responses to a maximal dose of GHRH.Leptin (10microg i.c.v.) or vehicle was administered at random before GHRH (10microg/kg i,v.) or GHRP-6 (50microg/kg i.v.), to freely-moving rats with food available ad libitum and to (48h) food-deprived rats.Leptin and GH concentrations were measured by radioimmunoassay. Comparison between the different groups was assessed by the Mann-Whitney test.In comparison with fed rats, food-deprived rats showed a marked decrease in GH responses to GHRH as assessed by the area under the curve (5492+/-190ng/ml in fed rats and 1940+/-128ng/ml in fasted rats; P<0.05) and GHRP-6 (3695+/-450 in fed rats and 1432+/-229 in fasted rats; P<0.05). In comparison with its effects in vehicle-treated rats, leptin administered to food-deprived rats markedly increased GH responses to both GHRH (6625+/-613ng/ml; P<0.05) and GHRP-6 (5862+/-441ng/ml; P<0.05).These data suggest that the blunted GH response to GHRH and GHRP-6 in food-deprived rats is a functional and reversible state, and that the decreased leptin concentrations could be the primary defect responsible for the altered GH secretion in food-deprived rats." @default.
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- W2099651657 date "2000-01-01" @default.
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- W2099651657 title "Leptin increases in vivo GH responses to GHRH and GH-releasing peptide-6 in food-deprived rats" @default.
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- W2099651657 doi "https://doi.org/10.1530/eje.0.1420066" @default.
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