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T Cell Activation and Clonal Selection

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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.
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Related Experiment Video

Updated: Jul 8, 2026

Efficient Retroviral Transduction and Competitive Homing for Investigating GPCR-Mediated T-Cell Localization in Diverse Tissue Microenvironments

Efficient Retroviral Transduction and Competitive Homing for Investigating GPCR-Mediated T-Cell Localization in Diverse Tissue Microenvironments

Published on: March 28, 2025

The highway code of T cell trafficking.

F M Marelli-Berg¹, L Cannella, F Dazzi

¹Department of Immunology, Division of Medicne, Hammersmith Hospital Campus, Imperial College London, UK. f.marelli@imperial.ac.uk

The Journal of Pathology

|December 29, 2007

Summary

Primed T cells migrate to specific tissues for immune responses, guided by homing receptors and antigen recognition. Co-stimulatory signals further refine T cell migration and immune response anatomy.

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Human T Lymphocyte Isolation, Culture and Analysis of Migration In Vitro

Human T Lymphocyte Isolation, Culture and Analysis of Migration In Vitro

Published on: June 1, 2010

Area of Science:

Immunology
Cellular Biology
Molecular Biology

Background:

Effective immunity relies on coordinated T lymphocyte migration to specific tissue sites.
Naïve T cells recirculate in lymphoid tissues, while primed T cells target non-lymphoid tissues for effector functions.

Purpose of the Study:

To explore the mechanisms governing T cell migration to specific tissues.
To understand how T cell priming influences tissue-specific homing and immune responses.

Main Methods:

Analysis of molecular interactions involving tissue-selective integrins and chemokine receptors (homing receptors).
Investigation of antigen recognition by endothelium and its role in T cell migration.
Examination of co-stimulatory signals (CD28, CTLA-4) in regulating T cell migration and immune response anatomy.

Main Results:

Primed T cells develop the ability to home to specific organs like the skin and gut via homing receptors.
Endothelial antigen presentation induces specific T cell migration into tissues.
Co-stimulatory signals regulate T cell activation, differentiation, and the spatial organization of immune responses.

Conclusions:

T cell migration to specific tissues is a multi-step process involving homing receptors and antigen recognition.
Co-stimulatory signals play a critical role in orchestrating the anatomical specificity of T cell-mediated immune responses.