|
||
By




From the * Division of Infectious Diseases, ¶ Division of Experimental Pathology, and 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.
Department of
Immunology, Mayo Clinic, Rochester, Minnesota 55901;
Division of Infectious Diseases, Hennepin
County Medical Center, Minneapolis, Minnesota 55404; and § Immunex Corporation, Seattle,
Washington 98101
This article has been cited by other articles:
| TABLE OF CONTENTS |
|