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Effect of phenylephrine injected into the nucleus tractus solitarius of Sprague-Dawley rats and spontaneously hypertensive rats.

Abstract：

:In alpha-chloralose-anesthetized Sprague-Dawley (SD) rats with unilateral nucleus tractus solitarius (NTS) lesions, injection of the alpha(1)-adrenergic receptor agonist phenylephrine into the contralateral NTS dose-dependently increased arterial pressure (AP). Bunazosin (0.1 nmol) or prazosin (0.36 nmol), an alpha(1)-adrenergic receptor antagonist, also increased AP. When injected into the NTS, pre-treatment with phenylephrine (10 nmol) or both antagonists abolished the cardiovascular effects of glutamate and acetylcholine. In contrast, pre-treatment with prazosin or methylatropine did not alter the effect of phenylephrine. Phenylephrine (30 nmol) injected into the NTS abolished aortic depressor nerve (ADN) evoked-responses. The pressor effect of phenylephrine in the NTS was exaggerated in spontaneously hypertensive rats (SHR). These results suggest that when injected into the NTS, the effect of phenylephrine may be due to a baroreflex blockade resulting from direct modulatory actions or non-specific neuronal alterations rather than stimulating the alpha(1)-adrenergic receptor. Additionally, this effect is enhanced in SHR.

journal_name

Brain Res Bull

journal_title

Brain research bulletin

authors

Tsukamoto K,Ito S,Katsunuma N,Hiratsuka M,Masubuchi Y,Kanai T,Kawabe T,Yajima Y,Kanmatsuse K

doi

10.1016/s0361-9230(02)00757-8

keywords:

subject

Has Abstract

pub_date

2002-08-15 00:00:00

pages

351-6

issue

4

eissn

0361-9230

issn

1873-2747

pii

S0361923002007578

journal_volume

58

pub_type

杂志文章

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