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From the * Howard Hughes Medical Institute, Center for Cancer Research, and Department of
Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; Chronic inflammatory autoimmune diseases such as multiple sclerosis, diabetes, and rheumatoid arthritis are caused by CD4+ Th1 cells. Because Th2 cells antagonize Th1 cell functions in several ways, it is believed that immune deviation towards Th2 can prevent or cure autoimmune diseases. Experimental autoimmune encephalomyelitis (EAE) is a demyelinating disease
used as a model for multiple sclerosis. Using an adoptive transfer system we assessed the role of
Th1 and Th2 cells in EAE. In vitro generated Th1 and Th2 cells from myelin basic protein
(MBP)-specific TCR transgenic mice were transferred into normal and immunodeficient mice.
Th1 cells caused EAE in all recipients after a brief preclinical phase. Surprisingly, Th2 cells also
caused EAE in RAG-1 KO mice and in
Department of
Pathology (Neuropathology), Albert Einstein College of Medicine, Bronx, New York 10461

T cell-deficient mice, albeit after a longer preclinical phase. Normal or 
T cell-deficient mice were resistant to EAE induced by Th2 cells.
The histopathological features of this disease resembled those of an allergic process. In addition,
disease induction by Th1 cells was not altered by coadmininstration of Th2 cells in any of the
recipients. These findings indicate that MBP-specific Th2 cells have the potential to induce
EAE and that the disease induced by previously activated Th1 cells cannot be prevented by
normal lymphocytes nor by previously activated Th2 cells.
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