Cerebral microvascular responses to endothelins: the role of ETA receptors.

Abstract:

:The regulatory role of endothelins in cerebral microvessels was investigated in a recently developed model system which allows the study of small cerebral vessels in their normal microenvironment. Using brain slices of the rat neocortex, it was shown that the isopeptide endothelin-3 (ET-3) had no effect on cerebral microvessels, while the isopeptide endothelin-1 (ET-1) produced a potent, dose-dependent vasoconstriction. When a recently developed antagonist of ETA receptors (cyclo-[D-Asp-L-Pro-D-Val-L-Leu-D-Trp]; ETant) was administered prior to treatment with ET-1, the vasoconstrictor response to ET-1 was inhibited in a dose-dependent manner. When ETant was administered after the establishment of a constriction by ET-1, the constrictor response to ET-1 was partially reversed, and this effect was weaker than that seen in the pre-treatment paradigm. These findings indicate that constrictor responses to ET-1 in cerebral microvessels are mediated by ETA receptors. Inasmuch as endothelins have been implicated in pathological forms of vasoconstriction in the CNS, the present findings also suggest that endothelin antagonists may be useful in the treatment of cerebral ischemia.

journal_name

Brain Res

journal_title

Brain research

authors

Sagher O,Jin Y,Thai QA,Fergus A,Kassell NF,Lee KS

doi

10.1016/s0006-8993(09)90024-5

subject

Has Abstract

pub_date

1994-09-26 00:00:00

pages

179-84

issue

1-2

eissn

0006-8993

issn

1872-6240

pii

S0006-8993(09)90024-5

journal_volume

658

pub_type

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