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In cultured rat anterior pituitary cells, the agonist [Asu1,6, Arg8]vasopressin (AVP-A) increased by 1.5-fold 32Pi incorporation into phosphatidic acid (PA), as early as 15 s after its addition. Increased phosphatidylinositol (PI) labeling became significant 4 min after AVP-A addition. Dose-response measurements with AVP-A showed ED50 values of 76 and 62 nM for PA and PI labeling, respectively. Peptide corticotropin-releasing factor (CRF) (0.1 microM) did not affect the stimulatory effect of AVP-A on PA and PI labeling. These data suggest that stimulation of PI metabolism in corticotrophs may be one of the early events involved in the stimulation of ACTH release induced by vasopressin.
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