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Adrenalectomy increases beta-lipotropin secretion over beta-endorphin secretion from anterior pituitary corticotrophs.

Previous studies have indicated that acute stress in vivo or ovine corticotropin releasing hormone (oCRH) in vitro, releases both beta-lipotropin (beta-LPH) and beta-endorphin (beta-END) from the anterior lobe, with beta-END predominating over beta-LPH by 2:1. However, repeated stress shifts this ratio to proportionately more beta-LPH released with re-stress or oCRH in vitro. Alternative hypotheses were that the glucocorticoids released during stress altered the processing of proopiomelanocortin (POMC) or that the increased biosynthetic drive resulted in an inability of the processing enzymes to keep pace with biosynthesis. To distinguish between these alternatives, adrenalectomy studies were performed. Following removal of glucocorticoid negative feedback there is greatly increased secretion of beta-END-IR from anterior lobe corticotrophs with a subsequent increase in biosynthetic drive. Under these conditions of increased biosynthetic drive in the absence of steroids, the corticotroph secretes primarily beta-LPH, suggesting that increased biosynthetic drive alters the posttranslational processing rate of POMC.