Abstract
Multiple sclerosis (MS) is a central nervous system inflammatory disorder with evidence of peripheral immune dysregulation. Abnormalities of the immune suppressive cytokine TGF-β have been reported, but not fully defined, in MS. Through a pathway-focused expression profiling of the peripheral blood, we found abnormalities of TGF-βRII, SMAD4 and SMAD7 expression in subjects with MS, and reduction in the levels of TGF-β regulated genes, indicating an overall reduction in TGF-β signaling in MS. The response to exogenous TGF-β was intact, however, indicating an extrinsic defect of TGF-β signaling in MS. These results indicate that TGF-β control is diminished in MS.
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