Abstract
Phencyclidine (PCP) has been shown to stimulate the pituitary-adrenal axis in the rat. The purpose of the present study was to determine whether opiate receptors are involved in this effect by testing whether pretreatment with the opiate antagonist naloxone can antagonize PCP-induced ACTH and corticosterone release. PCP (10.0 mg/kg) produced increases in plasma ACTH and corticosterone 60 min after s.c. administration. Pretreatment with naloxone (2.0 mg/kg s.c.) did not reduce the rise in plasma levels of ACTH or corticosterone produced by PCP. These results indicate that naloxone-sensitive opiate receptors are not involved in the PCP-induced stimulation of the pituitary-adrenal axis in rats.
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