JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
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Plasma distribution, disappearance half-time, metabolic clearance rate, and degradation of synthetic ovine corticotropin-releasing factor in man.

The plasma distribution, disappearance half-time, MCR, and degradation of corticotropin-releasing factor (CRF) were studied in normal men who received a pulse injection of synthetic ovine CRF (oCRF). Graded iv doses of oCRF produced a linear increase in plasma immunoreactive oCRF (IR-oCRF). The calculated total plasma content of IR-oCRF 2 min after injection represented 41.7 +/- 2.5% (mean +/- SE) of the injected dose. The disappearance of IR-oCRF from plasma was characterized by a biexponential decay curve, with initial distribution and subsequent metabolic t 1/2 values of 6.1 +/- 0.5 and 55 +/- 3.8 min (mean +/- SE), respectively. In two subjects who were studied for 14-16 h after being given the largest dose of oCRF, there was third phase of disappearance, with a t 1/2 of 198 +/- 54 min. The MCR of IR-oCRF was 2.4 +/- 0.2 ml/min . kg (146 +/- 12 l/m2 . day) and was relatively constant over a 3000-fold dose range. The volume of distribution of IR-oCRF was 6.2 +/- 0.6 liters. The plasma IR-oCRF component, examined at increasing intervals after injection, was indistinguishable from the injected oCRF in that its apparent molecular size had not been altered, nor had its biological activity been attenuated. The continued circulation of apparently intact, biologically active oCRF for at least 90 min after injection was associated with sustained release of ACTH into the plasma. Thus, the clearance of oCRF from circulating human plasma is prolonged and appears to be responsible for the sustained release of ACTH that occurs after injection of this hormone-releasing factor.

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