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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...
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
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...
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...
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.

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Related Experiment Video

Updated: May 10, 2026

Measurement of T Cell Alloreactivity Using Imaging Flow Cytometry
09:04

Measurement of T Cell Alloreactivity Using Imaging Flow Cytometry

Published on: April 19, 2017

Calibrating T cell responsiveness through interactions with self.

Judith N Mandl1,2, Heather J Melichar3,4, Byron B Au-Yeung5

  • 1Department of Physiology, McGill University, Montreal, Quebec, Canada. judith.mandl@mcgill.ca.

Nature Reviews. Immunology
|May 8, 2026
PubMed
Summary
This summary is machine-generated.

Naive T cells integrate self-peptide information through T cell receptor (TCR) interactions, influencing their function. This continuous engagement with self-ligands tunes T cell responses, challenging the binary

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Related Experiment Videos

Last Updated: May 10, 2026

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Area of Science:

  • Immunology
  • Cellular Biology
  • T cell immunology

Background:

  • T cell activation is often viewed as a binary 'on/off' switch.
  • Naive T cells encounter self-peptide-MHC ligands during development and circulation.
  • These interactions are critical for T cell survival and functional tuning.

Purpose of the Study:

  • To review evidence on the role of self-peptide-MHC interactions in T cell function.
  • To challenge the binary model of T cell activation.
  • To highlight the importance of self-peptide repertoire in T cell discrimination.

Main Methods:

  • Review of existing immunological and cellular biology literature.
  • Analysis of T cell receptor (TCR) signaling pathways.
  • Integration of data on thymic selection and peripheral T cell surveillance.

Main Results:

  • Self-peptide-MHC interactions provide crucial information beyond simple survival signals.
  • The naive T cell state is dynamic and influenced by continuous self-ligand engagement.
  • Self-peptide encounters shape T cell function and responsiveness to foreign antigens.

Conclusions:

  • The 'off' state of naive T cells is functionally significant and not fixed.
  • Understanding the self-peptide repertoire is key to deciphering T cell self/non-self discrimination.
  • Harnessing T cell responses to foreign antigens requires knowledge of self-peptide interactions.