Mice that are homozygous for the targeted mutation are viable, normal in size and do not display any gross physical or behavioral abnormalities. No gene product (protein) is detected by Western blot analysis of isolated peritoneal macrophages. Bone marrow derived macrophages do not respond to spirochete (Borrelia burgdorferi) lipoprotein challenge, although non-lipoprotein sonicate stimulates activation. Arthritis due to B. burgdorferi infection, as assessed by rear ankle swelling, is more severe in mutant mice. Tissues of infected mutants can contain up to 100 times higher bacteria levels than those found in wildtype littermates. Elevated spirochete numbers persist 8 weeks post-infection. Homozygotes do not produce TNF-alpha or IL-6, and do not develop symptoms of illness when treated with leptospiral (Leptospira interrogans) lippolysaccharide (LPS). This mutant mouse strain may be useful in studies of host response to bacterial endotoxins such as septic shock.

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Bone marrow derived macrophages of homozygous mice do not respond to spirochete (Borrelia burgdorferi) lipoprotein challenge, although non-lipoprotein sonicate stimulates activation. Arthritis due to B. burgdorferi infection, as assessed by rear ankle swelling, is more severe in mutant mice. Tissues of infected mutants can contain up to 100 times higher bacteria levels than those found in wildtype littermates. Elevated spirochete numbers persist 8 weeks post-infection. Homozygotes do not produce TNF-alpha or IL-6, and do not develop symptoms of illness when treated with leptospiral (Leptospira interrogans) lippolysaccharide (LPS). This mutant mouse strain may be useful in studies of host response to bacterial endotoxins such as septic shock.

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