Inhibition of human immunodeficiency virus replication in acutely infected CD4+ cells by CD8+ cells involves a noncytotoxic mechanism.
The mechanism by which CD8+ T cells from human immunodeficiency virus (HIV)-infected individuals suppress HIV replication in acutely infected CD4+ T cells was investigated. Cytotoxicity was not involved, as the antiviral activity of the CD8+ cells did not correlate with the ability to lyse HIV-infected or uninfected CD4+ T cells. In addition, the frequency of HIV-infected CD4+ cells increased during coculture with CD8+ T cells even in the absence of detectable levels of virus replication. Moreover, separation of the CD4+ and CD8+ cells by a 0.4-micron-pore-size filter delayed HIV replication, indicating a role, at least in part, for a soluble factor. However, cell contact was required for optimal antiviral activity. These results extend further the observation on the mechanism of antiviral HIV activity by CD8+ cells from infected individuals. They support the conclusion that CD8+ cells can play a major role in preventing development of disease in HIV-infected individuals.
Chiron Corporation, Emeryville, California 94608.
C M
CM
Walker
A L
AL
Erickson
F C
FC
Hsueh
J A
JA
Levy
D000911:Antibodies, Monoclonal; D015703:Antigens, CD / Q000032:analysis; D015704:CD4 Antigens / Q000276:immunology*; D016827:CD8 Antigens / Q000276:immunology*; D002478:Cells, Cultured; D003602:Cytotoxicity, Immunologic; D006678:HIV / Q000276:immunology / Q000502:physiology*; D006679:HIV Seropositivity; D006801:Humans; D008213:Lymphocyte Activation; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D013997:Time Factors; D014779:Virus Replication
D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D015704:CD4 Antigens; D016827:CD8 Antigens