Identification of the adrenal protease that cleaves pro-gamma-MSH: the dawning of a new era in adrenal physiology?
In respect to growth, the adrenal is a dynamic organ that requires constant stimuli from pituitary-derived POMC peptides to maintain its tonic state since either hypophysectomy or dexamethasone treatment results in rapid adrenal atrophy. It has been previously demonstrated that peptides derived from the N-terminus of the 16 kDa fragment of POMC not containing the gamma-MSH sequence are potent adrenal mitogens both in vitro and in vivo. However, since these shorter peptides are not found in the circulation, it has been suggested that they are generated by cleavage of the 16 kDa fragment by a specific protease expressed by the adrenal. This putative enzyme has recently been identified and this commentary describes the findings to date and highlights some of their possible implications.
Bicknell
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School of Animal and Microbial Sciences, The University of Reading, Whiteknights, PO Box 228, Reading, Berkshire RG6 6AJ, UK. A.B.Bicknell@rdg.ac.uk
D000302:Adrenal Cortex / Q000166:cytology / Q000378:metabolism*; D000818:Animals; D002455:Cell Division; D008954:Models, Biological; D010446:Peptide Fragments / Q000378:metabolism*; D010902:Pituitary Gland / Q000378:metabolism*; D011333:Pro-Opiomelanocortin / Q000378:metabolism*; D051381:Rats; D012697:Serine Endopeptidases / Q000032:analysis / Q000378:metabolism*
D010446:Peptide Fragments; D011333:Pro-Opiomelanocortin; D012697:Serine Endopeptidases; C431509:adrenal secretory protease