[Effect of passive immunization with an antiCRF antiserum on the secretion of ACTH in rats]

A peptide with 41-residue having CRF activity both in vivo and in vitro has recently been isolated from ovine hypothalami (41-CRF). Passive immunization of Sprague-Dawley Rats with an antiserum against this peptide is followed by a significant decrease in plasma ACTH and cortisosterone levels under basal conditions as well as after ether-stress and adrenalectomy. These data demonstrate that 41-CRF plays a major role in the physiological regulation of ACTH secretion.