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                                       Details for article 2 of 14 found articles
  Co-expression of Apoptosis-Related Molecules on Activated CD8+ CD38+ T-cells is Associated with HIV-1 Disease Progression
Title: Co-expression of Apoptosis-Related Molecules on Activated CD8+ CD38+ T-cells is Associated with HIV-1 Disease Progression
Author: José W. Rodríguez
Luis A. Rodríguez
Griselle Font
Luis A. Cubano
Nawal M. Boukli
Miguel Otero
Robert Hunter
Madhavan P. Nair
Eddy Ríos-Olivares
Appeared in: American journal of infectious diseases
Paging: Volume 3 (2007) nr. 4 pages 208-216
Year: 2007
Contents: CD8+ T cells play a major role in controlling HIV-1 infection through the release of soluble lytic and non-lytic antiviral factors. Their decrease or defective function contributes to the HIV-1 disease progression. HIV-1 disease progression has been associated with a remarkable increase of CD38 expression on CD8+ T-cells. It has been also documented that a significant distribution of HIVspecificCD8+T-cells resides in the CD8+CD38+ T-cell sub-population. The failure of HIV-specific CD8+CD38+ T-cells to control HIV-1 infection has been attributed to several mechanisms including apoptosis. However, the relationship between the CD38 expression and molecular events involved in CD8+ T-cell apoptosis is not well understood. Using four-color flow cytometric analysis, the present cross-sectional study we evaluated the expression of four membrane-associated apoptosis-related molecules (TNFR-1, Annexin-V, CXCR4, and CD95) and two cytoplasm-associated apoptosis-related molecules (Bcl-2 and the active form caspase-3) in 41 HIV-1 positive patients and 15 HIV-1 negative individuals. Flow cytometric analysis made on freshly isolated PBMC showed that HIV-1 infection alters the level of expression of CD38, CD95, CXCR4, Bcl-2 and active caspase-3. No significant change in the expression of Annexin V or TNFR-1 was found. A positive correlation was established between CD95, CXCR4, and active caspase-3 expression with low CD4 count and high plasmaviremia and CD38 expression. Data suggest that the majority of activated CD8+CD38+ T-cells were apoptotic because they expressed active caspase-3 and the rest of these cells were highly susceptible to become apoptotic since they co-expressed CD95 and CXCR4. Results also suggest that one of the most likely HIV-mediated apoptosis mechanisms is via CD95 and CXCR4 induction through the caspase cascade despite the expression of Bcl-2. All these observations may provide an additional explanation of why HIV-1 infection is not fully contained by HIV-specific CD8+CD38+ T-cells leading to HIV-1 disease progression.
Publisher: Science Publications (provided by DOAJ)
Source file: Elektronische Wetenschappelijke Tijdschriften

                             Details for article 2 of 14 found articles
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