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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...

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...

Cells of the Adaptive Immune Response

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...

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Related Experiment Video

Updated: Mar 18, 2026

Determining Optimal Cytotoxic Activity of Human Her2neu Specific CD8 T cells by Comparing the Cr51 Release Assay to the xCELLigence System

Determining Optimal Cytotoxic Activity of Human Her2neu Specific CD8 T cells by Comparing the Cr51 Release Assay to the xCELLigence System

Published on: August 8, 2012

What Scales the T Cell Response?

Viveka Mayya¹, Michael L Dustin²

¹Kennedy Institute of Rheumatology, University of Oxford, Roosevelt Drive, Headington, Oxford OX3 7FY, UK.

Trends in Immunology

|July 2, 2016

Summary

This summary is machine-generated.

T cells scale their responses by integrating signals over time. This temporal integration of T cell receptor (TCR) and IL2 signaling, alongside transcriptional regulation, allows for precise control of immune responses and prevents tissue damage.

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Last Updated: Mar 18, 2026

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Area of Science:

Immunology
Cellular Biology
Systems Biology

Background:

T cells modulate clonal expansion and cytokine production based on antigen signal strength.
This scaling is crucial for balancing protective immunity and preventing immunologically driven tissue damage.

Purpose of the Study:

To elucidate the mechanisms by which T cells achieve scaled responses.
To understand the role of temporal signal integration in T cell activation and function.

Main Methods:

Focus on theoretical and conceptual frameworks.
Analysis of existing literature on T cell receptor (TCR) signaling, IL2 signaling, and transcriptional regulation.
Integration of signaling pathways to explain quantitative T cell responses.

Main Results:

Temporal integration of digital TCR signaling, through mediator accumulation, underlies scaled T cell expansion.
Temporally integrated crosstalk between TCR and IL2 signaling orchestrates a coherent, collective T cell response.
Transcriptional programs provide regulatory interactions that quantitatively scale T cell responses.

Conclusions:

Temporal integration of signaling events is a fundamental mechanism for scaled T cell responses.
This integration balances protective immunity with the risk of tissue damage.
Identified mechanisms offer new insights into T cell behavior and potential therapeutic targets.