The Journal of Experimental Medicine
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J. Exp. Med., Volume 187, Number 11, June 1, 1998 1779-1788

Impaired Anaphylactic Responses with Intact Sensitivity to Endotoxin in Mice Lacking a Platelet-activating Factor Receptor

By Satoshi Ishii,* Tomoyuki Kuwaki,Dagger Takahide Nagase,§ Kazushige Maki,par Fumi Tashiro,par Shinji Sunaga,par Wei-Hua Cao,Dagger Kazuhiko Kume,* Yoshinosuke Fukuchi,§ Koichi Ikuta,par Jun-ichi Miyazaki,par Mamoru Kumada,Dagger and Takao Shimizu*

From the * Department of Biochemistry and Molecular Biology, the Dagger  Department of Physiology, the § Department of Geriatrics, and the par  Department of Disease-related Gene Regulation Research (Sandoz), Faculty of Medicine, The University of Tokyo, Tokyo 113, Japan; and the  Pharmaceutical Basic Research Laboratories (Aobadai), Japan Tobacco Inc., Kanagawa 227, Japan

Platelet-activating factor (PAF) is a potent phospholipid mediator with diverse biological activities in addition to its well-known ability to stimulate platelet aggregation. Pharmacologic studies had suggested a role for PAF in pregnancy, neuronal cell migration, anaphylaxis, and endotoxic shock. Here we show that disruption of the PAF receptor gene in mice caused a marked reduction in systemic anaphylactic symptoms. Unexpectedly, however, the PAF receptor-deficient mice developed normally, were fertile, and remained sensitive to bacterial endotoxin. These mutant mice clearly show that PAF plays a dominant role in eliciting anaphylaxis, but that it is not essential for reproduction, brain development, or endotoxic shock.

Key words: platelet-activating factorplatelet-activating factor receptoranaphylaxisendotoxic shockgene targeting


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