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HIV-specific CD8+ T cells: serial killers condemned to die?
Constantinos Petrovas1, Yvonne M Mueller, Peter D Katsikis
1Department of Microbiology and Immunology, and Institute of Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, Pennsylvania 19129, USA.
Current HIV Research
|April 14, 2004
Summary
Cytotoxic CD8+ T cells (CTL) are crucial for controlling HIV, but HIV-specific CTL are prone to apoptosis. This susceptibility, triggered by HIV-infected cells, hinders effective viral control and disease prevention.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Cytotoxic CD8+ T cells (CTL) play a vital role in controlling viral infections, including HIV.
- Despite a robust initial response, CTL fail to control HIV, leading to disease progression.
- HIV employs immune evasion strategies, and intrinsic defects in CTL are increasingly recognized.
Purpose of the Study:
- To review recent findings on intrinsic defects in CTL during HIV infection.
- To highlight the role of apoptosis in HIV-induced CTL dysfunction.
- To explore how understanding these defects can inform therapeutic and vaccine strategies.
Main Methods:
- Review of existing literature on CTL function and HIV infection.
- Focus on studies investigating CTL phenotypes, activation, and effector functions.
- Analysis of evidence implicating apoptosis in CTL evasion by HIV.
Main Results:
- HIV-specific CTL exhibit altered differentiation and potential defects in activation and effector functions.
- Conflicting data exists on CTL killing ability, but IFN-gamma production appears preserved.
- HIV-specific CTL are particularly susceptible to CD95/Fas-induced apoptosis.
Conclusions:
- HIV-specific CTL susceptibility to apoptosis, induced by HIV-infected cells expressing CD95L/FasL, is a key mechanism of viral immune evasion.
- Intrinsic defects, especially apoptosis, contribute to CTL failure in controlling HIV.
- Targeting these intrinsic defects could lead to novel therapies and improved HIV vaccines.