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Related Concept Videos

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.
Naive T cells that have not yet encountered an antigen express two primary CD...
B Cell Activation and Differentiation01:24

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...
Diversity of Antigen Receptors01:28

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...
Antigen Presenting Cells01:22

Antigen Presenting Cells

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.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

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.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview

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Related Experiment Video

Updated: Jun 18, 2026

Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist
07:48

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

Published on: April 25, 2018

T cell decision-making decodes the dynamic antigenic landscape.

Inbal Eizenberg-Magar1, Lior Dayan1, Benny Chain2

  • 1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel.

Frontiers in Immunology
|June 17, 2026
PubMed
Summary
This summary is machine-generated.

T cells detect not only antigen amount but also changes in antigen levels over time. Understanding antigen dynamics is key for immune responses, tolerance, and vaccine development.

Keywords:
T cell activationT cell receptor signalingantigen dynamicsimmune decisionkinetic proofreadingsignal decodingsystems immunologytemporal signal processing

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Accessing Early Differentiation of Virus-Specific Follicular Helper CD4+ T Cell in Acute LCMV-Infected Mice
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Accessing Early Differentiation of Virus-Specific Follicular Helper CD4+ T Cell in Acute LCMV-Infected Mice

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Accessing Early Differentiation of Virus-Specific Follicular Helper CD4+ T Cell in Acute LCMV-Infected Mice
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Area of Science:

  • Immunology
  • Cellular Biology
  • Systems Biology

Background:

  • Adaptive immune system encounters diverse antigens.
  • Existing research often treats the antigenic environment as static.
  • Antigen levels dynamically fluctuate in real biological systems.

Purpose of the Study:

  • To review how antigen presentation dynamics influence T cell activation and fate.
  • To explore mechanisms enabling T cells to sense antigen concentration changes.
  • To discuss implications for immune tolerance, activation, and memory.

Main Methods:

  • Review of theoretical and experimental evidence on T cell signaling dynamics.
  • Analysis of cellular and molecular mechanisms (e.g., kinetic proofreading, feedback circuits).
  • Examination of T cell responses across various timescales (seconds to days).

Main Results:

  • T cells are sensitive to both antigen quantity and its rate of change.
  • Mechanisms like kinetic proofreading and feedback circuits allow dynamic sensing.
  • Antigen dynamics impact immune tolerance, activation, and memory formation.

Conclusions:

  • T cell responses are shaped by antigen presentation dynamics.
  • Manipulating antigen exposure dynamics can modulate immune responses.
  • Incorporating temporal features into models can enhance understanding of immune decision-making and therapies.