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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...
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...
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...
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...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Related Experiment Video

Updated: Jun 16, 2026

Isolation of CD4+ T cells from Mouse Lymph Nodes Using Miltenyi MACS Purification
09:47

Isolation of CD4+ T cells from Mouse Lymph Nodes Using Miltenyi MACS Purification

Published on: November 1, 2007

Characterizing the dynamics of CD4+ T cell priming within a lymph node.

Jennifer J Linderman1, Thomas Riggs, Manjusha Pande

  • 1Department of Chemical Engineering, Center for Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI 48109, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|February 16, 2010
PubMed
Summary
This summary is machine-generated.

Generating adaptive immunity requires T cell interactions with dendritic cells (DCs) in lymph nodes. Our model shows primed CD4+ T cell output depends linearly on cognate T cell frequency and nonlinearly on DC numbers.

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Area of Science:

  • Immunology
  • Computational Biology
  • Systems Biology

Background:

  • Adaptive immunity generation relies on T cell zone interactions between antigen-bearing dendritic cells (DCs) and rare cognate T cells within lymph nodes.
  • Fundamental questions persist regarding the dynamics of DC-CD4+ T cell interactions and their impact on T cell priming.

Purpose of the Study:

  • To investigate the relationships between cognate T cell frequency, DC density, DC-T cell interaction parameters, and the output of primed T cells.
  • To address how these factors influence the generation of adaptive immunity post-infection or immunization.

Main Methods:

  • Development of an agent-based model simulating lymph node dynamics.
  • Analysis of relationships between key parameters: cognate T cell frequency, DC density, peptide-MHCII levels, and primed T cell output.

Main Results:

  • Primed CD4+ T cell output shows a linear relationship with cognate T cell frequency.
  • Primed CD4+ T cell output exhibits a nonlinear relationship with the number of antigen-bearing DCs.
  • A trade-off exists between peptide-MHCII quantity per DC and the number of DCs in influencing CD4+ T cell priming.
  • Peptide-MHCII half-life plays a minor but significant role in CD4+ T cell priming, contrasting its role in CD8+ T cell priming.

Conclusions:

  • The study highlights the critical roles of cognate T cell frequency and DC numbers in CD4+ T cell priming.
  • Findings suggest limitations in extrapolating findings from high-cognate frequency microscopy studies to physiological infection dynamics.
  • Identifies pathogen-targeted mechanisms that can be modulated to significantly affect CD4+ T cell priming efficiency.