The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 183, 1377-1388, Copyright © 1996 by Rockefeller University Press


ARTICLES

Concurrent engagement of CD40 and the antigen receptor protects naive and memory human B cells from APO-1/Fas-mediated apoptosis

C Lagresle, P Mondiere, C Bella, PH Krammer and T Defrance
Institut National de la Sante et de la Recherche Medicale (INSERM) Unit 404, "Immunite et Vaccination," Institut Pasteur de Lyon, France.

Naive and memory B cells were isolated from human tonsils and examined for expression of APO-1/Fas and for their sensitivity to the APO-1- dependent apoptosis. APO-1 was found to be constitutively expressed on memory but not on naive B cells. The susceptibility of both cell types to the APO-1 apoptotic pathway was acquired upon CD40 triggering and was correlated with increased expression of the APO-1 receptor. Both naive and memory B cells were protected from the APO-1-mediated death signal after dual ligation of the Ag receptor adn CD40. Our findings suggest that the APO-1 pathway controls the specificity of B cell responses to T-dependent Ags and that occupancy of the Ag receptor dictates the outcome of APO-1-ligation on B cell survival.
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