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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 0.1 N HCl but soluble in alkaline solvents with diminished corticotropin-releasing activity. rUcn dissolved in 0.1 M sodium phosphate buffer as a stock solution maintained its bioactivity and had the equal corticotropin-releasing activity with rat/human corticotropin-releasing factor (r/hCRF). rUcn stimulated the adrenocorticotropin release via CRF-receptors accompanied by the additive effect with r/hCRF, the synergistic effect with arginine vasopressin and the dose-dependent inhibition of a potent CRF-receptor antagonist.
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