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Related Concept Videos

Cell-mediated Immune Responses01:40

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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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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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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Related Experiment Video

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Generation of Orthotopic Pancreatic Tumors and Ex vivo Characterization of Tumor-Infiltrating T Cell Cytotoxicity
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Generation of Orthotopic Pancreatic Tumors and Ex vivo Characterization of Tumor-Infiltrating T Cell Cytotoxicity

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T cell activation.

Jennifer E Smith-Garvin1, Gary A Koretzky, Martha S Jordan

  • 1Abramson Family Cancer Research Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. smithje@mail.med.upenn.edu

Annual Review of Immunology
|January 10, 2009
PubMed
Summary
This summary is machine-generated.

This review celebrates 25 years of T cell receptor (TCR) research, detailing TCR signal transduction and T cell activation, including costimulatory molecules and integrin crosstalk.

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Area of Science:

  • Immunology
  • Cellular Signaling
  • Molecular Biology

Background:

  • The T cell receptor (TCR) is crucial for adaptive immunity.
  • Understanding TCR signaling is key to T cell activation.
  • 25 years of research have elucidated TCR signal transduction.

Purpose of the Study:

  • To review the historical development of TCR signaling paradigms.
  • To summarize the current understanding of TCR signal transduction.
  • To highlight recent advances in T cell activation mechanisms.

Main Methods:

  • Literature review of seminal and recent studies on TCR signaling.
  • Analysis of molecular mechanisms underlying T cell activation.
  • Examination of crosstalk between TCR and other cell surface molecules.

Main Results:

  • Established the basic paradigm of TCR signal transduction.
  • Detailed current knowledge of TCR signaling pathways.
  • Summarized findings on integrin crosstalk, costimulation, and negative regulation.

Conclusions:

  • TCR signaling is a complex process involving multiple molecular interactions.
  • Recent research has expanded our understanding of T cell activation.
  • Further investigation into regulatory mechanisms is essential.