Abstract
A pregnancy-related therapeutic effect in an animal model of Lyme disease provides new evidence supporting the role of Th2 cytokines in alleviation of arthritic manifestations of infection. To reach this conclusion, [M. Moro et al. (2001) J. Immunol. 166, 7404–7409] followed the progression of arthritis in C3H mice infected with the agent of Lyme disease, Borrelia burgdorferi. Non-pregnant mice consistently developed severe Lyme arthritis following infection. In contrast, pregnant mice had a significant reduction in arthritis severity associated with markedly increased levels of the Th2 cytokine IL-4. A slight reduction in T- cell production of the Th1 cytokine IFN-γ was also noted. The alleviation of symptoms and enhanced Th2 cytokine production apparently resulted from the elevation of systemic progesterone levels during pregnancy. SHK
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