Document 0378 DOCN M9490378 TI Direct involvement of extracellular HIV-1 virions in the apoptosis of CD8+ lymphocytes: a two-step model. DT 9411 AU Mercure L; Wainberg MA; McGill University AIDS Centre, Lady Davis Institute--Jewish; General Hospital, Montreal, Quebec, Canada. SO Med Hypotheses. 1994 Mar;42(3):159-68. Unique Identifier : AIDSLINE MED/94335770 AB Lymphocytes of the CD8 phenotype play an important role in controlling viral burden in HIV-1 infection. Cytotoxic CD8+ T lymphocytes (CTL) can kill HIV-infected cells and in addition, are able to secrete a soluble factor that inhibits HIV replication. In most cases, HIV-infected individuals experience an unexplained CD8+ lymphopenia during the advanced stage of the disease that particularly affect HIV-1-specific CTL. It has been reported that CD8+ lymphocytes in HIV-infected individuals undergo programmed cell death or apoptosis. We now present a two-step model to explain CD8+ apoptosis, based on anchorage of HIV-1-associated MHC class 1 antigen into the envelope of extracellular viral particles. DE Antigens, CD8 Apoptosis Histocompatibility Antigens Class I Human HIV Infections/BLOOD/ETIOLOGY HIV-1/IMMUNOLOGY/*PHYSIOLOGY Lymphopenia/ETIOLOGY *Models, Biological Receptors, Antigen, T-Cell T-Lymphocytes, Cytotoxic/IMMUNOLOGY/*PATHOLOGY JOURNAL ARTICLE REVIEW REVIEW, TUTORIAL SOURCE: National Library of Medicine. NOTICE: This material may be protected by Copyright Law (Title 17, U.S.Code).