PMID: 9524732Apr 3, 1998Paper

Hypothalamic and hypophyseal regulation of growth hormone secretion

Cellular and Molecular Neurobiology
M T Bluet-PajotC Kordon

Abstract

1. Regulation of pulsatile secretion of growth hormone (GH) relies on hypothalamic neuronal loops, major transmitters involved in their operation are growth hormone releasing hormone (GHRH) synthetized mostly in arcuate nucleus (ARC) neurons, and somatostatin (SRIH), synthetized both in hypothalamus periventricular (PVe) and ARC neurons. 2. Neurons synthetizing both peptides can inhibit each other in a reciprocal manner. Other neuropeptides synthetized in ARC neurons, such as galanin, or in ARC interneurons, such as neuropeptide Y (NPY), are able to modulate synthesis and release of GHRH and SRIH into the hypothalamohypophyseal portal system. 3. In addition, the hitherto uncharacterized endogenous ligand of the recently cloned growth hormone releasing peptide receptor, expressed mostly in the ARC, triggers GH release, presumably by actions on ARC interneurons. 4. Thyroid, gonadal, and adrenal steroid hormones also affect the GHRH-SRIH balance; a differential distribution of sex steroid receptors in the ARC and the PVe is likely to account for the different pattern of GH secretion in male and female animals. 5. Growth hormone itself is able to inhibit the amplitude of GH secretory episodes and to increase their frequency, by ent...Continue Reading

Citations

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