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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...

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Related Experiment Video

Updated: May 25, 2026

In Vitro Assay to Evaluate the Impact of Immunoregulatory Pathways on HIV-specific CD4 T Cell Effector Function
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Differential Gag-specific polyfunctional T cell maturation patterns in HIV-1 elite controllers.

Sara Ferrando-Martínez1, Joseph P Casazza, Manuel Leal

  • 1Laboratory of Molecular Immuno-Biology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.

Journal of Virology
|January 27, 2012
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Summary

Elite controllers with HIV maintain undetectable viral loads due to less mature, polyfunctional Gag-specific CD4 T cells. These cells support HIV-specific CD8 T lymphocytes, aiding spontaneous viral control.

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Area of Science:

  • Immunology
  • Virology
  • HIV Research

Background:

  • Elite controllers (EC) spontaneously control HIV without treatment, but the role of T cell maturation is unclear.
  • Understanding T cell phenotypes in EC, relative controllers (RC), and noncontrollers (NC) is crucial for HIV management.
  • HIV-specific T cell responses are key to controlling viral replication.

Purpose of the Study:

  • To compare the maturational and functional phenotypes of Gag-specific CD4 and CD8 T cells in EC, RC, and NC.
  • To elucidate the role of T cell phenotypes in spontaneous HIV control.
  • To identify T cell markers associated with elite control of HIV.

Main Methods:

  • Comparative analysis of T cell phenotypes (maturational and functional) in HIV-infected individuals.
  • Flow cytometry to assess Gag-specific CD4 and CD8 T cells.
  • Categorization of participants into elite controllers (EC), relative controllers (RC), and noncontrollers (NC) based on viral load.

Main Results:

  • EC exhibited higher frequencies of HIV-specific CD4 T cells and less mature, polyfunctional Gag-specific CD4 T cells (CD27(+) CD57(-) CD45RO(+)) compared to NC.
  • Polyfunctional Gag-specific CD8 T cells were more frequent in EC than in RC and NC.
  • A direct correlation was observed between immature Gag-specific CD4 T cells and mature HIV-specific CD8 T cells.

Conclusions:

  • Immature Gag-specific interleukin-2 (IL-2)-producing CD4(+) T cells support HIV-specific CD8(+) T lymphocytes, contributing to spontaneous HIV control.
  • The unique T cell phenotype in EC differentiates them from RC and NC.
  • These findings highlight the importance of T cell maturation in HIV pathogenesis and control.