The blood pressure effects of alpha-adrenoceptor antagonists injected in the medullary site of action of clonidine: the nucleus reticularis lateralis.

Abstract:

:We administered a series of alpha-blocking drugs to the nucleus reticularis lateralis (NRL) of the medulla oblongata, the main site for the hypotensive action of clonidine. These experiments were performed on pentobarbital anaesthetized cats. Drugs were injected through a needle which was stereotaxically inserted. Prazosin (6 nmol) was hypertensive (MBP = +25 +/- 8%), corynanthine had no effect and AR-C239 (7 nmol), another alpha 1-blocker, was hypotensive (MBP = -16 +/- 3.5%). The alpha 2-blockers, yohimbine and idaxozan, were hypotensive. The blood pressure effects of alpha-blocking drugs directly microinjected in the nucleus reticularis lateralis cannot be simply related to their selectivity for a particular subtype of alpha-receptors.

journal_name

Life Sci

journal_title

Life sciences

authors

Bousquet P,Feldman J

doi

10.1016/0024-3205(87)90566-2

subject

Has Abstract

pub_date

1987-03-16 00:00:00

pages

1045-52

issue

11

eissn

0024-3205

issn

1879-0631

pii

0024-3205(87)90566-2

journal_volume

40

pub_type

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