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In Vitro Assay to Evaluate the Impact of Immunoregulatory Pathways on HIV-specific CD4 T Cell Effector Function
09:26

In Vitro Assay to Evaluate the Impact of Immunoregulatory Pathways on HIV-specific CD4 T Cell Effector Function

Published on: October 16, 2013

The interleukin-2 receptor subunit expression and function on peripheral blood lymphocytes from HIV-infected and

G Vanham1, L Kestens, J Vingerhoets

  • 1Institute of Tropical Medicine, Antwerp, Belgium.

Clinical Immunology and Immunopathology
|April 1, 1994
PubMed

Insights

HIV infection alters interleukin-2 receptor (IL2R) expression on T cells, decreasing alpha chains and increasing beta chains. However, lymphocyte activation via IL2 remains preserved or enhanced, even in advanced HIV disease.

Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Interleukin-2 receptor (IL2R) plays a crucial role in T cell activation and function.
  • HIV infection is known to dysregulate immune cell function and expression profiles.
  • Understanding IL2R dynamics in HIV is vital for assessing immune status.

Purpose of the Study:

  • To investigate the expression of IL2R alpha and beta chains on circulating lymphocytes in HIV-infected individuals.
  • To evaluate the functional consequences of altered IL2R expression on lymphocyte activation by IL2.
  • To determine if HIV infection impacts the high-affinity and intermediate-affinity IL2R pathways.

Main Methods:

  • Utilized chain-specific monoclonal antibodies and indirect immunofluorescence flow cytometry.
  • Analyzed IL2R subunit expression on CD4 T cells, CD8 T cells, and natural killer (NK) cells.
  • Assessed lymphocyte activation by measuring CD69 upregulation in response to IL2 stimulation and conducted inhibition studies.

Main Results:

  • Decreased IL2R alpha chain expression on CD4 and CD8 T cells in HIV+ subjects compared to controls.
  • Enhanced IL2R beta chain expression on both T cell subsets in HIV+ individuals.
  • Preserved or enhanced IL2-induced CD69 upregulation on T cells and NK cells, particularly pronounced on CD8 T cells in HIV+ subjects.
  • Identified differential contributions of high-affinity and intermediate-affinity IL2R to CD69 expression on CD4 and CD8 T cells, respectively.

Conclusions:

  • HIV infection significantly alters IL2R alpha and beta chain expression on circulating T cells.
  • Despite altered receptor expression, IL2-mediated early lymphocyte activation is preserved or enhanced in HIV-infected individuals, even in advanced stages.
  • These findings highlight the complex interplay between HIV and the IL2 signaling pathway in immune regulation.

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