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Recently, interleukin (IL)-6 was shown to be one of the earliest factors that trigger the differentiation of naive T cells into effector Th2 cells in vitro. Lyme arthritis was studied in IL-6-deficient mice, since joint inflammation is influenced by the T helper cell response against Borrelia burgdorferi. Arthritis incidence increased in B. burgdorferi-infected IL-6-deficient mice compared with that in controls. Furthermore, splenocytes of B. burgdorferi-infected IL-6-deficient mice produced significantly less IL-4 in response to Borrelia antigens than did C57BL/6 (B6) mice, and B. burgdorferi-specific IgG2b levels were significantly reduced in IL-6-deficient mice at 60 days of infection. These results extend previous in vitro observations by demonstrating an in vivo role for IL-6 in the differentiation of CD4 T cells toward a Th2 phenotype and further show that CD4 T cell responses influence murine Lyme arthritis.

Borrelia burgdorferi–Infected, Interleukin‐6–Deficient Mice Have Decreased Th2 Responses and Increased Lyme Arthritis