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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...
Cells of the Adaptive Immune Response01:23

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...
T Cell Types and Functions01:24

T Cell Types and Functions

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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...

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Related Experiment Video

Updated: Jul 15, 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

Single-cell dynamics of T-cell priming.

Sarah E Henrickson1, Ulrich H von Andrian

  • 1Department of Pathology, Harvard Medical School, Boston, MA 02115, USA.

Current Opinion in Immunology
|April 17, 2007
PubMed
Summary

New in vivo imaging reveals T-cell activation dynamics by dendritic cells (DCs), challenging old ideas. Integrating these findings with existing theories is crucial for understanding adaptive immunity initiation.

Area of Science:

  • Immunology
  • Cellular Biology
  • Infectious Disease

Background:

  • Adaptive immune responses are initiated by T-cell activation, a process historically understood through various theories.
  • Recent in vivo imaging provides new insights into the dynamic interactions between T cells and dendritic cells (DCs).
  • Existing paradigms may not fully encompass the complexity revealed by advanced imaging techniques.

Purpose of the Study:

  • To synthesize new in vivo imaging observations with established theories of T-cell activation.
  • To integrate diverse hypotheses regarding the factors influencing T-cell activation by DCs.
  • To formulate testable predictions for future immunological research.

Main Methods:

  • In vivo imaging techniques to observe T-cell and DC interactions dynamically.

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

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Real-Time In Vitro Migration Assay for Primary Murine CD8+ T Cells

Published on: May 24, 2024

Related Experiment Videos

Last Updated: Jul 15, 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

Real-time Live Imaging of T-cell Signaling Complex Formation
10:31

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

Published on: June 23, 2013

Real-Time In Vitro Migration Assay for Primary Murine CD8+ T Cells
06:42

Real-Time In Vitro Migration Assay for Primary Murine CD8+ T Cells

Published on: May 24, 2024

  • Analysis of factors governing T-cell interaction with antigen-bearing DCs.
  • Evaluation of parameters for antigenic signal dose and quality.
  • Investigation of T-cell signal interpretation mechanisms.

    • Main Results:

    • In vivo imaging has reshaped fundamental beliefs about T-cell activation dynamics.
    • Multiple interdependent factors influence a DC's ability to activate a naive T cell.
    • These factors include T-cell homing, signal characteristics, and T-cell interpretation.

    Conclusions:

    • A comprehensive understanding of T-cell activation requires integrating new dynamic observations with existing theories.
    • Viewing T-cell activation as a sum of interdependent factors can reconcile disparate hypotheses.
    • This integrated approach facilitates the formulation of novel, testable predictions for advancing immunology.