The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 184, 1513-1518, Copyright © 1996 by Rockefeller University Press


ARTICLES

Involvement of the CD95 (APO-1/Fas) receptor/ligand system in multiple sclerosis brain

P Dowling, G Shang, S Raval, J Menonna, S Cook and W Husar
Neurology Service, Department of Veterans Affairs Medical Center, East Orange, New Jersey 07018, USA.

Immunohistochemical methods were used to search for Fas receptor/Fas ligand system involvement in multiple sclerosis (MS) white matter brain lesions. We found large numbers of Fas ligand (Fas-L)-bearing cells present in two acute lesions and 12 of 16 chronic MS lesions, and very few positive cells in non-inflammatory controls. Four of six brains from non-MS neuropathologic conditions associated with inflammation and white matter disease were, however, also positive for Fas-L. Double staining with cell-specific markers revealed that the pattern of ligand- positive cells in chronic MS lesions was complex and composed of several different cell types which were primarily resident glial cells with a small overlay of macrophages. Fas/APO 1 (CD95) receptor expression in MS tissue was also evaluated and marked upregulation of the receptor was found. In addition, Fas receptor was induced, but to a lesser extent, in numerous control brains. The observations that TUNEL- positive dying cells were present in MS lesions and showed excellent co- localization with Fas-L, indicate that the Fas death system may contribute to plaque pathogenesis and could lead to the development of a new category of therapeutic agents for MS.
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