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From the * Department of *Cancer, Immunology, and Infectious Diseases, Collagen-induced arthritis in the DBA/1 mouse is an experimental model of human rheumatoid arthritis. To examine the role of leukotrienes in the pathogenesis of this disease, we have
developed embryonic stem (ES) cells from this mouse strain. Here, we report that DBA/1 mice
made deficient in 5-lipoxygenase-activating protein (FLAP) by gene targeting in ES cells develop and grow normally. Zymosan-stimulated leukotriene production in the peritoneal cavity of these mice is undetectable, whereas they produce substantial amounts of prostaglandins. The
inflammatory response to zymosan is reduced in FLAP-deficient mice. The severity of collagen-induced arthritis in the FLAP-deficient mice was substantially reduced when compared
with wild-type or heterozygous animals. This was not due to an immunosuppressive effect, because anti-collagen antibody levels were similar in wild-type and FLAP-deficient mice. These
data demonstrate that leukotrienes play an essential role in both the acute and chronic inflammatory response in mice.
Department of Molecular
Sciences, Central Research Division, Pfizer, Inc., Groton, Connecticut 06340; and § Curriculum in
Genetics and Molecular Biology and Department of Medicine, University of North Carolina, Chapel
Hill, North Carolina 27599-7248
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