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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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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...
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Related Experiment Video

Updated: Dec 8, 2025

Automated Cell Enrichment of Cytomegalovirus-specific T cells for Clinical Applications using the Cytokine-capture System
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CD32 is enriched on CD4dimCD8bright T cells.

Amber K Virdi1, Jennillee Wallace1, Hannah Barbian1

  • 1Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, IL, United States of America.

Plos One
|September 22, 2020
PubMed
Summary
This summary is machine-generated.

CD32 is highly expressed on double positive T cells, including CD4dimCD8bright T cells, irrespective of HIV status. This finding suggests CD32

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Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • CD4dimCD8bright T cells are a distinct, highly activated CD8+ T cell population.
  • CD32 (Fc gamma receptor IIa) has been implicated in HIV latency and T cell activation.
  • Previous work established CD4dimCD8bright T cells as activated, anti-HIV, and HIV-infected.

Purpose of the Study:

  • To investigate CD32 expression on CD4dimCD8bright T cells in the context of HIV infection.
  • To determine if CD32 expression on these cells correlates with HIV status, CD4 count, or viral load.

Main Methods:

  • Flow cytometry was used to quantify CD32 expression.
  • Peripheral blood samples from HIV-negative and HIV-positive individuals were analyzed.
  • CD32 frequency was assessed on CD4dimCD8bright T cells and CD4+ T cells.

Main Results:

  • CD32 was significantly higher on CD4dimCD8bright T cells compared to CD4+ T cells in both HIV-negative (60% vs 17%) and HIV-positive (54% vs 12%) individuals.
  • CD32 expression on CD4dimCD8bright T cells did not correlate with CD4 count or viral load.
  • Elevated CD32 expression was observed on other double-positive T cell populations regardless of HIV serostatus.

Conclusions:

  • CD32 is enriched on double-positive T cells, including CD4dimCD8bright T cells, irrespective of HIV serostatus.
  • The specific functional role of CD32 on these double-positive T cells requires further investigation.