Platelet activating factor (PAF) involvement in endotoxin-induced hypotension in rats. Studies with PAF-receptor antagonist kadsurenone

Biochemical and Biophysical Research Communications
T W DoebberT Y Shen

Abstract

Evidence from three types of experiments indicates that platelet activating factor (PAF)1 is an important mediator of endotoxin-induced hypotension in rats. a) Endotoxin infusion stimulates the time-dependent appearance of PAF in the blood. b) PAF infusion results immediately (less than 30 sec) in hypotension while endotoxin-induced hypotension takes 3-5 min to occur, allowing time for PAF production. c) Infusion of the specific PAF-receptor antagonist kadsurenone (2.2 mumole/kg bolus, 0.9 mumoles/min/kg continuous infusion), which inhibits PAF-induced hypotension by 67%, causes a 67% reversal of endotoxin-elicited hypotension. An additional finding of this study is that rats respond hypotensively to each of a series of low-dose PAF infusions but only to the first low-dose endotoxin infusion. These endotoxin-refractory rats do respond to subsequent PAF infusions.

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Related Concepts

Platelet activating factor receptor
Kadsurenone, (2S-(2alpha,3beta,3abeta))-isomer
Metazoa
Diphenylbenzofuran
Benzopyrans
Endotoxins
Alkalescens-Dispar Group
Hypotension
Platelet Activating Factor
Platelet Membrane Glycoproteins

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