Evidence for platelet-activating factor as a novel mediator in experimental stroke in rabbits.

Abstract:

:Platelet-activating factor is a potent mediator of inflammation, which has untoward effects on cerebrovascular and neural elements. While several investigators have reported attenuation of ischemic damage after treatment with antagonists of platelet-activating factor, no study has proved endogenous production of platelet-activating factor in ischemia of the central nervous system. We hypothesized that endogenous production of platelet-activating factor participates in the early pathologic manifestations of deteriorating stroke. In 12 rabbits, we found tissue levels of platelet-activating factor measured by the release of serotonin from washed platelets to be elevated by approximately 20-fold in spinal cord injured by 25 minutes of ischemia and 2 hours of reperfusion (2.80 +/- 0.98 ng/g) compared with that in normal spinal cord (0.15 +/- 0.06 ng/g, p less than 0.01). Given during ischemia to seven rabbits, 10 mg/kg i.p. of a highly selective and potent antagonist of platelet-activating factor (BN 50739) accentuated the early postischemic hyperemia and prevented the delayed hypoperfusion measured by on-line laser-Doppler flowmetry (-35 +/- 7% of baseline [n = 7] without versus 33 +/- 14% with treatment, p less than 0.01) and the edema formation measured as the increase in tissue water content (4.4 +/- 0.7% without [n = 6] versus 2.1 +/- 0.6% with [n = 7]treatment, p less than 0.05) after 2 hours of reperfusion. This neurochemical and pharmacologic evidence emphasizes a new perspective of ischemia-induced phospholipid degradation and suggests an important role for platelet-activating factor in the early manifestations of stroke.

journal_name

Stroke

journal_title

Stroke

authors

Lindsberg PJ,Yue TL,Frerichs KU,Hallenbeck JM,Feuerstein G

doi

10.1161/01.str.21.10.1452

subject

Has Abstract

pub_date

1990-10-01 00:00:00

pages

1452-7

issue

10

eissn

0039-2499

issn

1524-4628

journal_volume

21

pub_type

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