The central pressor actions of substance P are inhibited by GABA.

Abstract:

:The influence of GABA-ergic stimulation on the centrally evoked pressor and tachycardic responses to substance P (SP) was investigated in conscious rats. Intracerebroventricular (i.c.v.) pretreatment with the potent GABA agonist muscimol attenuated the pressor responses to i.c.v. administered SP in a dose-dependent and reversible fashion. Inhibition was maximal 5-60 min after muscimol injection and lasted up to 3 h. In contrast, the increases in heart rate in response to i.c.v. administered SP were not consistently inhibited by muscimol. Central pretreatment with muscimol prevented the increase of plasma adrenaline but not of plasma noradrenaline in response to i.c.v. administered SP. Our results demonstrate that the GABA-ergic system can exert an inhibitory control on pathways mediating the central pressor actions of SP. The selective inhibition of adrenaline secretion by muscimol implies that suppression of sympathetic outflow to the adrenal gland may be involved as an important mechanism. In addition, our findings point to a dissociation between pathways mediating the pressor and tachycardic effects of SP.

journal_name

Eur J Pharmacol

authors

Schneider B,Ganten D,Lang RE,Unger T

doi

10.1016/0014-2999(86)90512-1

subject

Has Abstract

pub_date

1986-11-12 00:00:00

pages

31-7

issue

1

eissn

0014-2999

issn

1879-0712

pii

0014-2999(86)90512-1

journal_volume

131

pub_type

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