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Plasma concentrations of adrenocorticotropin-related peptides after corticotropin-releasing hormone and vasopressin injections in sheep.

Ovine corticotropin-releasing hormone (1 micrograms/kg body weight) and arginine vasopressin (1 micrograms/kg) were injected iv in sheep, both separately and in combination. Plasma were sampled just before and 5, 15 and 30 min after the injection. Adrenocorticotropin-related peptides were isolated by Sephadex G-50 column chromatography and measured by RIA. Cortisol and aldosterone were determined on the same plasma samples. Three molecular forms of immunoreactive ACTH (IR-ACTH) were isolated: 'big' (greater than 20,000 mol wt), 'intermediate' (= 8000 mol wt) and 'little' (= 4500 mol wt). Following CRH injections, the three molecular forms of ACTH were enhanced, particularly the 'little' form, whereas 'intermediate' IR-ACTH was highly and specifically responsive to AVP. After a simultaneous injection of CRH and AVP, additive increases occurred for 'intermediate' and 'little' IR-ACTH. The release of different molecular forms of IR-ACTH after stimulation by CRH or AVP of corticotrope cells suggests that ACTH-related peptides could be stored in different intracellular pools or secreted by different pituitary cells.