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The Journal of Immunology, 2002, 168: 5997-6001.
Copyright © 2002 by The American Association of Immunologists


Cutting Edge

Cutting Edge: MyD88 Is Required for Resistance to Toxoplasma gondii Infection and Regulates Parasite-Induced IL-12 Production by Dendritic Cells1

Charles A. Scanga2,*, Julio Aliberti*, Dragana Jankovic*, Florence Tilloy{dagger}, Soumaya Bennouna§, Eric Y. Denkers§, Ruslan Medzhitov{dagger},{ddagger} and Alan Sher*

* Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892; {dagger} Section of Immunobiology, Yale University School of Medicine and {ddagger} Howard Hughes Medical Institute, New Haven, CT 06520; and § Department of Microbiology and Immunology, Cornell University College of Veterinary Medicine, Ithaca, NY 14853

Host resistance to the intracellular protozoan Toxoplasma gondii is highly dependent on early IL-12 production by APC. We demonstrate here that both host resistance and T. gondii-induced IL-12 production are dramatically reduced in mice lacking the adaptor molecule MyD88, an important signaling element used by Toll-like receptor (TLR) family members. Infection of MyD88-deficient mice with T. gondii resulted in uncontrolled parasite replication and greatly reduced plasma IL-12 levels. Defective IL-12 responses to T. gondii Ags (soluble tachyzoite Ag (STAg)) were observed in MyD88-/- peritoneal macrophages, neutrophils, and splenic dendritic cells (DC). In contrast, DC from TLR2- or TLR4-deficient animals developed normal IL-12 responses to STAg. In vivo treatment with pertussis toxin abolished the residual IL-12 response displayed by STAg-stimulated DC from MyD88-/- mice. Taken together, these data suggest that the induction of IL-12 by T. gondii depends on a unique mechanism involving both MyD88 and G protein-coupled signaling pathways.




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