The Journal of Experimental Medicine
Aegean Conferences: 2009 Conferences
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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/01/55/10 $2.00
Volume 185 January 1997 55-64

Macrophage-dependent Apoptosis of CD4+ T Lymphocytes from HIV-infected Individuals Is Mediated by FasL and Tumor Necrosis Factor

By Andrew D. Badley,* David Dockrell,* Margaret Simpson,Dagger Ron Schut,Dagger David H. Lynch,§ Paul Leibson,par and Carlos V. Paya*par

From the * Division of Infectious Diseases,  Division of Experimental Pathology, and par  Department of Immunology, Mayo Clinic, Rochester, Minnesota 55901; Dagger  Division of Infectious Diseases, Hennepin County Medical Center, Minneapolis, Minnesota 55404; and § Immunex Corporation, Seattle, Washington 98101

Apoptosis of bystander uninfected CD4+ T lymphocytes by neighboring HIV-infected cells is observed in cell culture and in lymphoid tissue of HIV-infected individuals. This study addresses whether antigen-presenting cells such as human macrophages mediate apoptosis of CD4+ T cells from HIV-infected individuals. Uninfected human macrophages, and to a larger degree, HIV-infected macrophages mediate apoptosis of T cells from HIV-infected, but not from uninfected control individuals. This macrophage-dependent killing targets CD4+, but not CD8+ T lymphocytes from HIV-infected individuals, and direct contact between macrophages and lymphocytes is required. Additional analyses indicated that the apoptosis-inducing ligands, FasL and tumor necrosis factor (TNF), mediate this macrophage-induced apoptosis of CD4+ T cells. These results support a role for macrophage-associated FasL and TNF in the selective depletion of CD4+ T cells in HIV-infected individuals.


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