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Recent studies indicate that TLRs are critical in generating innate immune responses during infection with HSV-1. In this study, we investigated the role of TLR2 signaling in regulating the production of neuroimmune mediators by examining cytokine and chemokine expression using primary microglial cells obtained from TLR2-/- as well as wild-type mice. Data presented here demonstrate that TLR2 signaling is required for the production of proinflammatory cytokines and chemokines: TNF-alpha, IL-1beta, IL-6, IL-12, CCL7, CCL8, CCL9, CXCL1, CXCL2, CXCL4, and CXCL5. CXCL9 and CXCL10 were also induced by HSV, but their production was not dependent upon TLR2 signaling. Because TLR2-/- mice display significantly reduced mortality and diminished neuroinflammation in response to brain infection with HSV, the TLR2-dependent cytokines identified here might function as key players influencing viral neuropathogenesis.

Cutting Edge: TLR2-Mediated Proinflammatory Cytokine and Chemokine Production by Microglial Cells in Response to Herpes Simplex Virus