Induction of vascular relaxation by hydroperoxides.

Abstract:

:Hydrogen peroxide, tert-butyl hydroperoxide, cumene hydroperoxide, and 3-chloroperoxybenzoic acid (CPB) and 15-HPETE relaxed, in a concentration dependent manner rat aortic rings contracted with PGF2 alpha (1 X 10(-5)). Relaxation is not inhibited by either indomethacin (2 X 10(-5) M), a cyclo-oxygenase inhibitor or eicosatetraynoic acid (1 X 10(-5) M), a dual cyclo-oxygenase and lipoxygenase inhibitor. Rings with intact endothelium relaxed to a greater degree on exposure to CPB and 15-HPETE. Methylene blue, a soluble guanylate cyclase inhibitor (1 X 10(-5) M) blocked the relaxation elicited by the five peroxides, whereas both superoxide dismutase (scavenger of superoxide anion) and mannitol (scavenger of hydroxyl radical) have no effect. We conclude that relaxation of vascular smooth muscle is a general property of peroxides and that the endothelium may in some instances facilitate this effect.

authors

Thomas G,Ramwell P

doi

10.1016/s0006-291x(86)80085-7

subject

Has Abstract

pub_date

1986-08-29 00:00:00

pages

102-8

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(86)80085-7

journal_volume

139

pub_type

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