by Shelly Agarwal-SJV (Class 11)
Adrenocorticotropic hormone (ACTH) also called corticotropin or adrenocorticotropin, a polypeptide hormone formed in the pituitary gland that regulates the activity of the outer region or cortex of the Adrenal glands. In mammals the action of ACTH is limited to those areas of the adrenal cortex in which the glucocorticoid hormones- cortisol and corticosterone are secreted. The secretion of ACTH is itself is regulated by another polypeptide, Corticotropin-releasing hormone (CRH), which is discharged from the hypothalamus in the brain in response to impulse transmitted by the nervous system.
ACTH is a segment of much larger glycoprotein prohormone molecule called proopiomelanocortin(POMC). POMC is synthesised by the corticotrophs of the anterior pituitary, which constitute about 10% of the gland.the molecule is split into several biologically active polypeptides when the secretory granules are discharged of the corticotrophs. Among these polypeptides is ACTH, whose major action is to stimulate the growth and secretion of the cells of the adrenal cortex. In addition, the hormone causes an increase in skin pigmentation. Other polypeptides derived from POMC include Melanocyte Stimulating Hormone(alpha and beta melanotropin), which increases skin pigmentation; beta- lipoprotein, which stimulates the release of fatty acids from adipose tissue; a small fragment of ACTH, which is thought to improve memory; and beta endorphin which suppresses pain.
Increased secretion of ACTH due to corticotroph tumor or corticotroph hyperplasia causes adrenocortical hyperfunction, whuch in turn causes the constellation of symptoms and signs called Cushing syndrome. ACTH deficiency can occur as a part of a multiple pituitary hormone deficiency syndrome or as an isolated deficiency.2019-04-04 17:05:32
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