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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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siRNA Electroporation to Modulate Autophagy in Herpes Simplex Virus Type 1-Infected Monocyte-Derived Dendritic Cells
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Selective autophagy regulates T cell activation.

Suman Paul1, Brian C Schaefer

  • 1Department of Microbiology and Immunology, Center for Neuroscience and Regenerative Medicine, Uniformed Services University, Bethesda, MD, USA.

Autophagy
|August 10, 2012
PubMed
Summary
This summary is machine-generated.

Autophagy degrades the BCL10 protein, a key T cell activator. Inhibiting this process enhances T cell receptor signaling, crucial for adaptive immunity and host defense against pathogens.

Keywords:
Bcl10LC3NF-kappaBSQSTM1T cellTCRp62proteasomesignal transductionubiquitin

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Published on: July 21, 2017

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • T cells are vital for host defense, requiring T cell receptor (TCR) activation for adaptive immunity.
  • Autophagy inhibition enhances T cell activation, but the underlying mechanism is unclear.
  • BCL10 is an adaptor protein crucial for TCR signaling, T cell proliferation, and function.

Purpose of the Study:

  • To elucidate the molecular mechanism by which selective autophagy controls T cell activation.
  • To investigate the role of autophagy in the degradation of the BCL10 protein.
  • To determine the signaling consequences of inhibiting BCL10 autophagic degradation.

Main Methods:

  • Investigated TCR-dependent autophagy targeting BCL10.
  • Examined the requirement of BCL10 K63-polyubiquitination and SQSTM1/p62 binding for BCL10 degradation.
  • Assessed NFKB1-RELA activation upon inhibition of BCL10 degradation via pharmacological or genetic autophagy inhibition.

Main Results:

  • Demonstrated a novel TCR-dependent autophagy pathway that selectively degrades BCL10.
  • Identified BCL10 K63-polyubiquitination and SQSTM1/p62 binding as essential for its autophagic degradation.
  • Showed that blocking BCL10 degradation leads to enhanced NFKB1-RELA activation and augmented T cell activation.

Conclusions:

  • Selective autophagy acts as a critical regulator of T cell activation by degrading BCL10.
  • This mechanism involves BCL10 ubiquitination and recognition by the autophagy adaptor SQSTM1/p62.
  • Understanding this pathway offers insights into controlling T cell responses for therapeutic applications.