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T Cell Activation and Clonal Selection

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.
Naive T cells that have not yet encountered an antigen express two primary CD...

Intracellular Signaling Affects Focal Adhesions

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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B Cell Activation and Differentiation

B Cell Activation and Differentiation

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.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...

Assembly of Signaling Complexes

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
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Diversity of Antigen Receptors

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...

Activation of Integrins

Activation of Integrins

Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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Related Experiment Video

Updated: Jul 7, 2026

A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins

A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins

Published on: March 22, 2012

Signal initiation in T-cell receptor microclusters.

Maria-Cristina Seminario¹, Stephen C Bunnell

¹Department of Pathology, Tufts University School of Medicine, Boston, MA 02111, USA.

Immunological Reviews

|February 16, 2008

Summary

T-cell receptor microclusters initiate signaling by assembling scaffolds. A new model proposes that cytoskeletal forces drive molecule segregation and microcluster formation at the immune synapse.

Area of Science:

Immunology
Cell Biology
Biophysics

Background:

T-cell activation is crucial for adaptive immunity.
T-cell receptor (TCR) microclusters are key signaling structures.
Current models lack explanations for microcluster properties like peripheral formation and movement.

Purpose of the Study:

To investigate the assembly, function, and fate of TCR microclusters.
To explore the roles of lipid rafts, galectin lattices, and protein scaffolds.
To propose a novel model for T-cell signal initiation.

Main Methods:

Dynamic imaging technologies
Analysis of TCR microclusters within immune synapses
Examination of molecular interactions and cytoskeletal involvement

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Real-time Live Imaging of T-cell Signaling Complex Formation

Real-time Live Imaging of T-cell Signaling Complex Formation

Published on: June 23, 2013

Related Experiment Videos

Last Updated: Jul 7, 2026

A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins

A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins

Published on: March 22, 2012

Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist

Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist

Published on: April 25, 2018

Real-time Live Imaging of T-cell Signaling Complex Formation

Real-time Live Imaging of T-cell Signaling Complex Formation

Published on: June 23, 2013

Main Results:

TCR microclusters are minimal signaling units.
Lipid rafts, galectin lattices, and protein scaffolds influence microcluster dynamics.
Cytoskeletal forces contribute to molecular segregation and scaffold assembly.

Conclusions:

A 'mechanical segregation' model explains TCR microcluster formation and function.
Cytoskeletal forces play a critical role in initiating T-cell signaling.
Understanding microcluster dynamics provides insights into T-cell activation.