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T Cell Activation and Clonal Selection01:22

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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.
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Histone deacetylation critically determines T cell subset radiosensitivity.

Jason L Pugh1, Alona S Sukhina2, Thomas M Seed3

  • 1Department of Immunobiology, University of Arizona College of Medicine, Tucson, AZ 85724; Arizona Center on Aging, University of Arizona College of Medicine, Tucson, AZ 85724; Graduate Interdisciplinary Program in Genetics, University of Arizona, Tucson, AZ 85719;

Journal of Immunology (Baltimore, Md. : 1950)
|July 4, 2014
PubMed
Summary
This summary is machine-generated.

Effector memory T cells show greater resistance to radiation-induced apoptosis than naive or central memory T cells. This survival advantage is linked to their open chromatin structure, facilitating rapid DNA damage repair.

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Area of Science:

  • Immunology
  • Radiation Biology
  • Cellular Biology

Background:

  • Lymphocytes exhibit varying sensitivity to ionizing radiation.
  • Naive T cells are more radiosensitive than memory T cells.
  • The radiosensitivity of specific memory T cell subsets remains poorly understood.

Purpose of the Study:

  • To investigate the radiosensitivity differences among naive (TN), effector memory (TEM), and central memory (TCM) T cell subsets.
  • To identify the molecular mechanisms underlying differential T cell radiosensitivity.
  • To explore the role of chromatin structure in DNA damage response and T cell survival.

Main Methods:

  • Comparative analysis of radiation-induced apoptosis in TN, TEM, and TCM T cells from C57BL/6 mice.
  • Assessment of pro- and antiapoptotic Bcl-2 family member expression.
  • Quantification of H2AX and γH2AX levels as markers of DNA damage.
  • Evaluation of chromatin accessibility and DNA repair dynamics.
  • Treatment with valproic acid (a histone deacetylase inhibitor) to modulate chromatin structure.

Main Results:

  • TEM cells demonstrated significantly higher resistance to radiation-induced apoptosis compared to TN and TCM cells.
  • No correlation was found between apoptosis levels and Bcl-2 family members or total H2AX/γH2AX content.
  • TEM cell survival correlated with immediate γH2AX marking, DNA break binding, and an open genome-wide chromatin structure.
  • T cells exhibited rapid DNA damage marking (within 30 seconds).
  • Valproic acid treatment improved survival of TN and TCM cells, mimicking TEM cell resistance, but did not affect caspase-mediated apoptosis.

Conclusions:

  • An open genome-wide chromatin state is a critical determinant of efficient, immediate DNA damage repair in T cells.
  • Chromatin structure, rather than Bcl-2 family proteins or total DNA damage markers, explains the observed differences in T cell subset radiosensitivity.
  • These findings provide insights into the mechanisms governing T cell survival following radiation exposure.