Evidence against the existence of GABA-B receptor sites in rat cerebrovascular tree.

Abstract:

:By the use of combined radioreceptor binding and autoradiographic techniques we attempted to analyse the biochemical characteristics and the anatomical localization of GABA-B receptors in sections of rat circle of Willis and pialarachnoid arteries. 3H-GABA in the presence of 40 microM isoguvacine and 2.5 mM CaCl2 was used to label GABA-B receptor sites. Sections of rat cerebellar cortex were also processed as a reference tissue. No specific 3H-GABA binding was detectable either in radioreceptor binding or autoradiographic experiments. In contrast, the ligand was bound to sections of cerebellar cortex in a manner consistent with the labelling of GABA-B receptor sites. These findings indicate that cerebrovascular physiological responses to GABA are not linked, in the rat cerebrovascular tree, to the activation of GABA-B receptors.

journal_name

Pharmacol Res

journal_title

Pharmacological research

authors

Napoleone P,Ferrante F,Amenta F

doi

10.1016/1043-6618(90)90731-r

subject

Has Abstract

pub_date

1990-05-01 00:00:00

pages

337-42

issue

3

eissn

1043-6618

issn

1096-1186

pii

1043-6618(90)90731-R

journal_volume

22

pub_type

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