Peptides. 1990 Mar-Apr;11(2):305-9.

Opioids and central baroreflex control: a site of action in the nucleus tractus solitarius.

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Department of Pharmacology, Emory University School of Medicine, Atlanta, GA 30322.

Abstract

These studies investigated whether the nucleus of the tractus solitarius (NTS) is a central site where opioids modulate baroreceptor reflexes. Microinjections into the NTS of [D-Ala2,MePhe4, Gly-ol5]enkephalin (DAGO) significantly reduced reflex-mediated depressor responses evoked by electrical stimulation of the aortic nerve. Subsequent NTS injections of naloxone restored baroreflexes to control levels. These results demonstrate that the NTS is a central site where exogenously administered opioids can modulate baroreceptor reflexes. NTS injections of naloxone had no effect on baroreflex function, suggesting that tonic activation of opioid receptors at this site plays little or no role in central baroreflex control.

PMID:: 2162532; [PubMed - indexed for MEDLINE]

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