Hormones can exert significant protective effects on autoimmune diseases by activating immunoregulatory mechanisms. One of the possible mechanisms of hormonal protection might be through the anti-inflammatory effects of the TGF-beta molecule. The present study investigated the changes in expression of two TGF-beta isoforms, TGF-beta1 and TGF-beta3, in C57BL/6 and TCR transgenic (T/R+) B10.PL mice that manifested or were protected against clinical signs of experimental autoimmune encephalomyelitis (EAE) with 17beta-estradiol (E2) treatment. We here demonstrate an inverse relationship between expression of TGF-beta1 that is enhanced in mice with EAE, and TGF-beta3 that is enhanced in E2-protected mice. The differential expression of TGF-beta isoforms was observed in spinal cord tissue but not spleen. Additionally TGF-beta1 expression was evident both in whole spinal cord tissue and mononuclear cells isolated from inflamed tissue, in contrast to TGF-beta3 that was only detected in spinal cord tissue but not in mononuclear cells. Further studies revealed that CD3 and especially MAC-1 positive cells were the main source of TGF-beta1 in the mononuclear CNS population. Of crucial importance, the TGF-beta3 isoform displayed anti-proliferative properties towards encephalitogenic cells in vitro. We propose that the TGF-beta1 and TGF-beta3 isoforms play opposing roles in the expression of EAE.
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