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- W4237852678 startingPage "5167" @default.
- W4237852678 abstract "Leptin is produced primarily in adipocytes and regulates body energy balance. A close link between leptin and pituitary hormones, including GH, has been reported. The mechanisms employed by leptin to influence somatotropes are not clear, however. Here we report a direct action of recombinant ovine leptin on primary cultured ovine somatotropes by analyzing the levels of mRNA encoding for GH or the receptors for GHRH (GHRH-R) and GH-releasing peptides (GHRP). Treatment of ovine somatotropes with leptin (10−7–10−9m) for 1–3 d reduced the mRNA levels encoding GH and GHRH-R, but increased GHRP receptor mRNA levels in a time- and dose-dependent manner. Three-day treatment of cells with leptin decreased the GH response to GHRH stimulation, but the GH response to GHRP-2 stimulation was increased. The combined effect of GHRH and GHRP-2 on GH secretion was not altered by treatment of the cells with leptin. These results demonstrated a direct action of leptin on ovine pituitary cells, leading to a reduced sensitivity of somatotropes to GHRH. It is also suggested that GHRP may be useful to correct the decrease in GHRH-induced GH secretion by leptin." @default.
- W4237852678 created "2022-05-12" @default.
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- W4237852678 date "2001-12-01" @default.
- W4237852678 modified "2023-09-26" @default.
- W4237852678 title "Direct Modification of Somatotrope Function by Long-Term Leptin Treatment of Primary Cultured Ovine Pituitary Cells" @default.
- W4237852678 doi "https://doi.org/10.1210/en.142.12.5167" @default.
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