Calcium antagonists and vasoconstrictor effects in intracerebral microarterioles.

Abstract:

:The purpose of this work was to study the contractile activity of intracerebral microarterioles and their sensitivity to the calcium antagonist nimodipine. Potassium depolarization evoked contraction and rhythmic activity that was blocked by nimodipine (IC50 0.08 nM). High concentrations of noradrenaline and prostaglandin F2 alpha were needed to elicit a contractile response. Intracerebral microarterioles were very sensitive to endothelin (ED50, 0.2 nM). The contractions evoked by concentrations of endothelin lower than or equal to ED50 were relaxed by nimodipine, which also blocked the amplified response to potassium chloride depolarization occurring with subthreshold concentrations of endothelin. We discuss these observations in relation to brain ischemia.

journal_name

Stroke

journal_title

Stroke

authors

Godfraind T,Morel N,Dessy C

subject

Has Abstract

pub_date

1990-12-01 00:00:00

pages

IV59-63

issue

12 Suppl

eissn

0039-2499

issn

1524-4628

journal_volume

21

pub_type

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