COMPARATIVE EFFECTS OF CENTRAL ADMINISTRATION OF NALOXONE AND CLONIDINE ON THE BLOOD-PRESSURE AND HEART-RATE RESPONSE TO ANTERIOR AND POSTERIOR HYPOTHALAMIC-STIMULATION

The purpose of this study was to examine the roles of brain opioid receptors, using the opioid receptor antagonist naloxone, and brain alpha (2) adrenergic and imidazole receptors, using their agonist clonidine, in the hypertension and tachycardia induced by electrical stimulation of the AHA and PHA area. Unanesthetized and unrestrained Wistar rats 300-409 g that had previously had catheters inserted into the lateral cerebral ventricle and femoral artery and electrodes in AHA or PHA areas received intracerebral (ICV) administration of naloxone or clonidine prior to hypothalamic stimulation. AHA and PHA stimulation with current strength from 0.5 to 2.0 mA produced a significant (p<0.05) and dose dependent increase in BP and heart rate. Naloxone reduced the increase in BP with AHA stimulation at all but the highest stimulation current intensity. Clonidine also blunted the BP increase to AHA stimulation but to a lesser degree than naloxone. The combination of both naloxone and clonidine prevented the increase in heart rate with AHA stimulation. In contrast to AHA stimulation, naloxone did not alter the BP increase produced by PHA stimulation while clonidine prevented the effects of PHA stimulation. Heart rate did not increase with PHA stimulation. These data suggest that (i) the mechanisms involved in the hypertensive response to AHA are different from that of PHA. (ii) the endogenous opioid system is more operative in mediating the BP elevation produced by AHA but not PHA stimulation (iii) activation of the central alpha adrenergic or imidazole receptors can suppress hypertensive response to both AHA and PHA but is more effective for PHA than AHA stimulation.