Hormone anabolic

The secretion of hypothalamic, pituitary, and target tissue hormones is under tight regulatory control by a series of feedback and feed- forward loops. This complexity can be demonstrated using the growth hormone (GH) regulatory system as an example. The stimulatory substance growth hormone releasing hormone (GHRH) and the inhibitory substance somatostatin (SS) both products of the hypothalamus, control pituitary GH secretion. Somatostatin is also called growth hormone-inhibiting hormone (GHIH). Under the influence of GHRH, growth hormone is released into the systemic circulation, causing the target tissue to secrete insulin-like growth factor-1, IGF-1. Growth hormone also has other more direct metabolic effects; it is both hyperglycemic and lipolytic. The principal source of systemic IGF-1 is the liver, although most other tissues secrete and contribute to systemic IGF-1. Liver IGF-1 is considered to be the principal regulator of tissue growth. In particular, the IGF-1 secreted by the liver is believed to synchronize growth throughout the body, resulting in a homeostatic balance of tissue size and mass. IGF-1 secreted by peripheral tissues is generally considered to be autocrine or paracrine in its biological action.

The role of dehydroepiandrosterone (DHEA) and its sulphated form (DHEAS) as anabolic hormones is still debated in the literature. In this review we describe the fundamental steps of DHEA physiological secretion and its peripheral metabolism. Moreover we will list all the observational and intervention studies conducted in humans. Many observational studies have tested the relationship between low DHEA levels and age-related changes in skeletal muscle and bone, while intervention studies underline the positive and significant effects of DHEA treatment on several parameters of body composition. Surprisingly, observational studies are not consistent with different effects in men and women. There is recent evidence of a significant role of DHEA in frailty syndrome and as predictor of mortality. However a more complete approach of the problem suggests the opportunity to not focus only on one single hormonal derangement but to analyze the parallel dysregulation of anabolic hormones including sex steroids, GH-IGF-1 system and other catabolic hormones.

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Hormone anabolic

hormone anabolic

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