[No authors listed]
IFN-gamma orchestrates a potent antimicrobial host response. However, the underlying molecular basis for this immunological defense system is largely unknown. In a systematic approach to identify IFN-gamma-regulated host effector molecules, a notable number of transcripts with consensus GTP-binding motives were obtained. Further extensive transcriptome and genome analyses identified five novel family members of murine guanylate-binding proteins (mGBPs) now designated mGBP6, 7, 8, 9, and 10. Moreover, in this study, all 10 mGBP members (mGBP1-10) were extensively characterized. mGBPs are selectively up-regulated in vitro by a set of proinflammatory cytokines and TLR agonists as well as in vivo after Listeria monocytogenes and Toxoplasma gondii infection. After IFN-gamma stimulation, mGBP1, 2, 3, 6, 7, and 9 are associated with intracellular Toxoplasma parasites and, interestingly, virulent Toxoplasma interfere with mGBP recruitment. Taken together, mGBPs comprise an important set of host defense molecules.
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