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Forms and activity of high molecular weight adrenocorticotropin in guinea pig

Forms and activity of high molecular weight adrenocorticotropin in guinea pig

Peptides 1(3): 223-229

ISSN/ISBN: 0196-9781

PMID: 6262739

DOI: 10.1016/0196-9781(80)90058-3

High molecular weight forms of adrenocorticotropin (ACTH) and endorphin were identified in extracts of guinea pig anterior and intermediate/posterior pituitary. Extracts of anterior pituitary contained ACTH immunoactive material with apparent molecular weights of 36,000, 24,000 and 4,500 daltons. The highest molecular weight form the ACTH co-migrated with a peak of endorphin immunoactive material. No material the size of glycosylated ACTH(1--39) was detected. Separated forms of high molecular weight ACTH prepared from mouse tumor cell culture medium stimulated the same maximal production of steroid as ACTH(1--39) in the guinea pig adrenal cell bioassay. Pro-ACTH/endorphin and ACTH biosynthetic intermediate were two orders of magnitude less potent than synthetic human ACTH(1--39); glycosylated ACTH(1--39) was equipotent to ACTH(1--39) although no similar material was detected in guinea pig pituitary extracts. Isolated guinea pig adrenal cortical cells were incubated with the various separated form of mouse tumor cell ACTH and products synthesized from (3H)pregnenolone were analyzed by two-dimensional thin-layer chromatography. The ratio of cortisol-related to corticosterone-related products was the same in response in glycosylated and nonglycosylated ACTH.

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