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- Document 0227
- DOCN M9620227
- TI Effects of TH1 and TH2 cytokines on CD8+ cell response against human
- immunodeficiency virus: implications for long-term survival.
- DT 9602
- AU Barker E; Mackewicz CE; Levy JA; Cancer Research Institute, University
- of California, San; Francisco 94143-0128, USA.
- SO Proc Natl Acad Sci U S A. 1995 Nov 21;92(24):11135-9. Unique Identifier
- : AIDSLINE MED/96074662
- AB CD8+ cells from long-term survivors [LTS; infected with human
- immunodeficiency virus (HIV) for 10 or more years and having CD4+ cell
- counts of > or = 500 cells per microliters] have a 3-fold greater
- ability to suppress HIV replication than do CD8+ cells from patients who
- have progressed to disease (progressors) during the same time period. A
- change in the pattern of cytokines produced in the host from those that
- typically favor cell-mediated immunity (T helper 1, TH1 or type 1) to
- those that down-regulate it (T helper 2, TH2 or type 2) was investigated
- as a cause of this reduced CD8+ cell anti-HIV function. Treatment of
- CD8+ cells from LTS with the TH1 cytokine interleukin (IL)-2 enhanced
- their anti-HIV activity, whereas exposure of these cells to TH2
- cytokines IL-4 or IL-10 reduced their ability to suppress HIV
- replication and to produce IL-2. IL-2 could prevent and reverse the
- inhibitory effects of IL-4 and IL-10. Moreover, prolonged exposure of
- CD8+ cells from some progressors to IL-2 improved the ability of these
- cells to suppress HIV replication. These observations support previous
- findings suggesting that strong CD8+ cell responses play an important
- role in maintaining an asymptomatic state in HIV infection. The data
- suggest that the loss of CD8+ cell suppression of HIV replication
- associated with disease progression results from a shift in cytokine
- production within the infected host from a TH1 to a TH2 pattern.
- Modulation of these cytokines could provide benefit to HIV-infected
- individuals by improving their CD8+ cell anti-HIV activity.
- DE Cells, Cultured Cytokines/*PHYSIOLOGY CD4-Positive
- T-Lymphocytes/IMMUNOLOGY CD8-Positive T-Lymphocytes/*IMMUNOLOGY
- Disease Progression Human HIV Infections/*IMMUNOLOGY HIV-1/GROWTH &
- DEVELOPMENT/*IMMUNOLOGY Immunity, Cellular Interleukin-10/PHYSIOLOGY
- Interleukin-2/BIOSYNTHESIS Interleukin-4/PHYSIOLOGY Support, U.S.
- Gov't, P.H.S. Th1 Cells/*PHYSIOLOGY Th2 Cells/*PHYSIOLOGY Time
- Factors Virus Replication JOURNAL ARTICLE
-
- SOURCE: National Library of Medicine. NOTICE: This material may be
- protected by Copyright Law (Title 17, U.S.Code).
-
-