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J. Exp. Med.,
Volume 188, Number 9, November 2, 1998 1587-1592
By



From the * Department of Immunology and Institute for Medical Science, and the Mast cells have long been believed to be the central effector cells in the development of immunoglobulin (Ig)E-dependent anaphylaxis. In this study, we investigated the role of mast cells in
IgE-dependent hapten-induced active fatal anaphylaxis using mast cell-deficient WBB6F1-
W/Wv (W/Wv) and congenic normal (+/+) mice. Although a 5-min delay in shock signs and
death were observed in W/Wv mice, 100% fatal reactions to penicillin V (Pen V) occurred in both +/+ and W/Wv mice. Administration of monoclonal anti-IL-4 antibody completely prevented the fatal reactions, and the effect of anti-IL-4 was associated with its suppressive activity on Pen V-specific serum levels of IgE, but not IgG. The platelet-activating factor (PAF) antagonist, BN 50739, completely prevented the fatal reactions in both strains of mice. Our kinetic study revealed, in contrast to no elevation of plasma histamine level in W/Wv mice, high
levels of PAF in the circulation after challenge in both +/+ and W/Wv mice, albeit to a lesser
degree in the latter case. These data indicate that cells other than mast cells are sufficient to induce an IgE-dependent active fatal anaphylaxis by elaborating PAF, which is the critical mediator for fatal murine anaphylaxis.
Department of
Anatomy, Chonbuk National University Medical School, Chonju, Chonbuk, 561-182, Republic of
Korea; and the § Department of Microbiology and Hormone Research Center, College of Natural
Science, Chonnam National University, Kwangju, Chonnam, 500-757, Republic of Korea
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