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Activation of protein kinase C (PKC) stimulates adrenocorticotropin (ACTH) release synergistically in the presence of corticotropin releasing factor (CRF). We examined the effect of a cyclic nucleotide-specific phosphodiesterase inhibitor, 1-isoamyl-3-isobutylxanthine (IIX), on arginine vasopressin (AVP)-induced ACTH release and intracellular cAMP accumulation in normal rat anterior pituitary cells...
Plasma immunoreactive (IR-) urocortin (Ucn) and corticotropin-releasing factor (CRF) levels in pregnant women were measured by their specific radioimmunoassays after extraction. Although plasma IR-CRF levels were increased in pregnant women as compared to men and non-pregnant women, there was no difference of plasma IR-Ucn levels among groups. Ucn mRNA was detected in cytotrophoblasts and syncytiotrophoblasts...
We developed a specific and sensitive radioimmunoassay (RIA) for rat urocortin (rUcn) and investigated the tissue distribution and concentration of immunoreactive (IR-)Ucn in rats. Antiserum was obtained by immunizing rabbits with synthetic rUcn21-35 coupled with bovine thyroglobulin. 125 I-[Tyr]18-rUcn19-37 was used as the tracer. The RIA detected synthetic rUcn1-40 as low as...
Ozawa, M., Y. Oki, F. Watanabe, K. Iino, M. Masuzawa, M. Iwabuchi and T. Yoshimi. Effect of urocortin and its interaction with adrenocorticotropin (ACTH) secretagogues on ACTH release. Peptides 19(3) 513-518, 1998.-We examined the effect of urocortin (Ucn) on the adrenocorticotropin (ACTH) release from cultured rat anterior pituitary cells and AtT 20 cells. Synthetic rat (r)Ucn was not soluble in...
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