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CRF and vasopressin concentrations in major brain regions after bilateral adrenalectomy and their involvement in adrenalectomy-induced ACTH secretion were investigated. At 5, 14 and 28 days after bilateral adrenalectomy, the plasma ACTH level was greatly elevated, whereas hypothalamic CRF content was reduced at 5 days and was not changed at 14 and 28 days after adrenalectomy. The CRF concentration in the medulla oblongata was reduced at 2-4 weeks after adrenalectomy. On the other hand, the arginine vasopressin (AVP) concentration was significantly elevated 2-4 weeks after adrenalectomy. An intrajugular administration of anti-ovine or anti-rat CRF serum significantly suppressed the elevated plasma ACTH level in adrenalectomized, freely moving rats, whereas anti-AVP serum or antipressor AVP antagonist, dpTyr(Me)AVP did not suppress the ACTH level. These results indicate that CRF played an important role in the adrenalectomy-induced ACTH elevation but that vasopressin was not involved.
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