...The San Francisco team also observed that regulatory T cells, a particular type of immune cell, were present in large numbers in the fetal lymph nodes. Regulatory T cells typically act to suppress immune responses. In a pregnant woman, for instance, these cells may help to prevent the immune system from treating the fetus as foreign and attacking it.
The scientists wondered whether a symmetrical mechanism might be at work in the fetus. ÃƒÂ¢Ã¢â€šÂ¬Ã…â€œWe wanted to get at what was inducing these cells to proliferate and what role they were playing specifically in fetal tissue,ÃƒÂ¢Ã¢â€šÂ¬Ã‚Â said Jeff E. Mold, an immunology graduate student at U.C.S.F.
The group was able to demonstrate that cells from the mother directly cause fetal tissue to produce more regulatory T cells. These, in turn, help keep the fetal immune system from attacking the motherÃƒÂ¢Ã¢â€šÂ¬Ã¢â€žÂ¢s cells...
http://www.nytimes.com/2009/02/03/healt ... 3immu.html
Heh. So, more reason to think that this is *way* too messy to try to shut down with immunoregulatory drugs. :-)
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