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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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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B Cell Activation and Differentiation01:24

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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist
07:48

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Published on: April 25, 2018

Cbl-b in T-cell activation.

Magdalena Paolino1, Josef M Penninger

  • 1IMBA, Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Dr. Bohrgasse 3, 1030, Vienna, Austria. magdalena.paolino@imba.oeaw.ac.at

Seminars in Immunopathology
|May 12, 2010
PubMed
Summary
This summary is machine-generated.

The E3 ubiquitin ligase Cbl-b is crucial for T-cell activation and tolerance. It regulates T-cell receptor signaling, ensuring immune responses are productive and preventing autoimmunity.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Signaling

Background:

  • Peripheral T-cell activation requires stringent control to prevent self-antigen responses.
  • Two signals—antigen and co-stimulation—are necessary for full T-cell activation.
  • Absence of co-stimulation leads to T-cell receptor signaling regulation, inducing tolerance.

Purpose of the Study:

  • To review the critical role of the E3 ubiquitin ligase Cbl-b in T-cell activation and tolerance.
  • To discuss the mechanisms by which Cbl-b modulates T-cell responses.
  • To explore the in vivo implications of Cbl-b in immune regulation.

Main Methods:

  • Review of biochemical and genetic studies.
  • Analysis of T-cell receptor (TCR) signaling pathways.
  • Investigation of co-stimulatory receptor function.

Main Results:

  • Cbl-b plays a critical role in the two-signal modulation of T-cell responses.
  • Cbl-b amplifies TCR signaling and releases T cells from suppression.
  • Studies highlight Cbl-b's function in controlling T-cell activation and tolerance.

Conclusions:

  • Cbl-b is essential for balancing T-cell activation and preventing autoimmunity.
  • Understanding Cbl-b's mechanisms offers insights into tuning immune responses.
  • This E3 ligase is a key regulator of T-cell-mediated immunity.