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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.
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Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
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Related Experiment Video

Updated: Apr 7, 2026

Mouse Na&#239;ve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
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Translation factor eIF4G2 directs CD8+ T cell lineage commitment by selectively enabling the IL-7 receptor response.

Jialong Cui1,2, Xinhui Zhang1,2, Yang Yang1

  • 1School of Basic Medical Sciences, Center for Big Data and Population Health of IHM, Anhui Medical University, Hefei, Anhui 230032, China.

Iscience
|April 6, 2026
PubMed
Summary

The translation factor eIF4G2 is crucial for CD8+ T cell development. It ensures proper interleukin-7 receptor (IL-7R) signaling, which is essential for CD8+ T cell lineage commitment in the thymus.

Keywords:
Cell biologyImmunology

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Interleukin-7 receptor (IL-7R) signaling is vital for T cell development in the thymus.
  • The precise mechanisms controlling IL-7R cytokine responsiveness during T cell lineage commitment remain largely unknown.

Purpose of the Study:

  • To identify key regulators of IL-7R signaling in T cell lineage commitment.
  • To elucidate the role of translation factors in CD8+ T cell fate determination.

Main Methods:

  • Analysis of eIF4G2 expression in thymocytes.
  • Generation and analysis of T cell-specific eIF4G2 knockout mice.
  • Assessment of IL-7 responsiveness and T cell lineage commitment markers.

Main Results:

  • eIF4G2 expression is upregulated in double-positive thymocytes.
  • T cell-specific deletion of eIF4G2 results in a blockade of CD8+ single positive thymocyte lineage commitment.
  • eIF4G2 deficiency impairs IL-7 responsiveness by affecting the γc subunit and IL-7Rα mRNA levels.
  • CD4+ lineage choice and T cell receptor (TCR) signaling remain unaffected.

Conclusions:

  • eIF4G2 acts as a critical translational regulator of IL-7R signaling.
  • This regulation is essential for enforcing faithful CD8+ T cell lineage commitment.
  • eIF4G2 represents a pivotal checkpoint for T cell fate determination.