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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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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
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Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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Clathrin controls bidirectional communication between T cells and antigen presenting cells.

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Summary

T cells use dynamic microvilli to survey for antigens. Upon recognition, they employ clathrin-mediated ectocytosis and trans-endocytosis for T cell receptor release and antigen capture.

Keywords:
ESCRTT cell activationT cell receptorclathrinectocytosisendocytosisepsin‐1

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • T cells utilize dynamic microvilli for antigen surveillance post-extravasation.
  • Upon antigen recognition, T cell microvilli stabilize and form microclusters on antigen-presenting cells.

Purpose of the Study:

  • To explore the functional properties of clathrin machinery in T cell activation.
  • To understand how clathrin regulates distinct membrane transfer modes at the immunological synapse.

Main Methods:

  • Investigated clathrin recruitment by ESCRT-0 component Hrs.
  • Examined the role of epsin-1 in clathrin-mediated trans-endocytosis.
  • Discussed the regulation of clathrin machinery during T cell activation.

Main Results:

  • Clathrin, with ESCRT-0, mediates ectocytosis (CEME) of T cell receptor (TCR)-loaded vesicles within 1-5 minutes.
  • Epsin-1 induces clathrin-mediated trans-endocytosis (CMTE) of TCR-peptide-MHC conjugates after 5-10 minutes.
  • Clathrin machinery controls opposing membrane transfer modes at the immunological synapse.

Conclusions:

  • Clathrin machinery plays a dual role in membrane transfer during T cell activation.
  • The dynamic regulation of clathrin adaptors (Hrs and epsin-1) dictates distinct endocytic and exocytic pathways.