Abstract
In cultured rat anterior pituitary cells, the agonist [Asu 1,6, Arg 8]vasopressin (AVP-A) increased by 1.5-fold 32P i 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 ED 50 values of 76 and 62 nM for PA and PI labeling, respectively. Peptide corticotropin-releasing factor (CRF) (0.1μM) 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. Vasopressin Corticotropin releasing factor Adrenocorticotropin Corticotroph Pituitary Phospholipid
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