What question did this study set out to answer?

To investigate the in vivo presence, cytotoxic capacity, and differentiation phenotype of circulating perforin-expressing CD4+ T cells in healthy individuals and patients with chronic viral infections.

June 1, 2002The Journal of Immunology

Characterization of CD4+ CTLs Ex Vivo

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To investigate the in vivo presence, cytotoxic capacity, and differentiation phenotype of circulating perforin-expressing CD4+ T cells in healthy individuals and patients with chronic viral infections.
Analyzed circulating CD4+ T cell populations ex vivo in healthy blood donors and patients across various stages of chronic viral infection, specifically HIV infection.
Assessed cytotoxic potential via perforin release assays and performed surface marker profiling to determine differentiation status.
Circulating CD4+ perforin+ T cells are present at low levels in healthy donors but expand substantially during chronic viral infections, including early primary HIV infection.
Ex vivo assays confirmed that these CD4+ T cells possess direct cytotoxic activity mediated through perforin release.
Phenotypic profiling identified these cytotoxic CD4+ cells as antigen-experienced, end-stage differentiated effector T cells.

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Implication

Ex vivo study demonstrates marked expansion of perforin-expressing cytotoxic CD4+ T cells in chronic HIV infection, indicating an active role in antiviral cellular immunity.

Cite This Study

Appay et al. (2002) studied this question.

synapsesocial.com/papers/6a7d023fa88f8d6a789ff9bd https://doi.org/10.4049/jimmunol.168.11.5954

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Implication

Ex vivo study demonstrates marked expansion of perforin-expressing cytotoxic CD4+ T cells in chronic HIV infection, indicating an active role in antiviral cellular immunity.

Characterization of CD4+ CTLs Ex Vivo

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Discussion

Implication

Cite This Study

Characterization of CD4+ CTLs Ex Vivo

Key Points

Discussion

Implication

Cite This Study

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