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Related Experiment Videos

PU.1 expression delineates heterogeneity in primary Th2 cells.

Hua-Chen Chang1, Shangming Zhang, Vivian T Thieu

  • 1Department of Microbiology and Immunology, and Walther Oncology Center, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA.

Immunity
|June 21, 2005
PubMed
Summary

The transcription factor PU.1 regulates T helper 2 (Th2) cell cytokine production. PU.1 expression defines specific cytokine profiles within Th2 cell populations, contributing to their heterogeneity.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Biology

Background:

  • T helper 2 (Th2) cells exhibit heterogeneous cytokine production, with underlying regulatory mechanisms remaining unclear.
  • The ETS family transcription factor PU.1 is differentially expressed in Th2 cells compared to Th1 cells.

Purpose of the Study:

  • To investigate the role of the transcription factor PU.1 in regulating the heterogeneous cytokine production of primary T helper 2 cells.

Main Methods:

  • Retroviral transduction to overexpress PU.1 in Th2 cells.
  • RNA interference (RNAi) to decrease PU.1 expression in Th2 cells.
  • Analysis of cytokine production and GATA-3 DNA binding in manipulated Th2 cells.

Main Results:

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  • Overexpression of PU.1 decreased Th2 cytokine production, while PU.1 knockdown increased it.
  • PU.1 expression was found in a subpopulation of Th2 cells that also expressed CCL22.
  • PU.1 interfered with GATA-3 DNA binding without affecting GATA-3 protein levels.

    • Conclusions:

    • PU.1 expression in subsets of Th2 cells establishes distinct cytokine profiles.
    • PU.1 contributes to the observed spectrum of cytokine production within Th2 cell populations.