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T Cell Activation and Clonal Selection

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...

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Related Experiment Video

Updated: Mar 14, 2026

Automated Cell Enrichment of Cytomegalovirus-specific T cells for Clinical Applications using the Cytokine-capture System

Automated Cell Enrichment of Cytomegalovirus-specific T cells for Clinical Applications using the Cytokine-capture System

Published on: October 5, 2015

CMV-Specific CD8 T Cell Differentiation and Localization: Implications for Adoptive Therapies.

Corinne J Smith¹, Michael Quinn¹, Christopher M Snyder¹

¹Department of Microbiology and Immunology, Thomas Jefferson University , Philadelphia, PA , USA.

Frontiers in Immunology

|October 4, 2016

Summary

Adoptive T cell therapy can prevent human cytomegalovirus (HCMV) reactivation in transplant patients. However, current methods may not fully restore diverse CD8+ T cell subsets needed for long-term immunity.

Keywords:

CMV-specific CD8 T cells T cell localization adoptive T cell therapy effector T cells memory T cells tissue-resident memory cells

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Published on: May 7, 2012

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Published on: October 5, 2015

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Expanding Cytotoxic T Lymphocytes from Umbilical Cord Blood that Target Cytomegalovirus, Epstein-Barr Virus, and Adenovirus

Expanding Cytotoxic T Lymphocytes from Umbilical Cord Blood that Target Cytomegalovirus, Epstein-Barr Virus, and Adenovirus

Published on: May 7, 2012

Area of Science:

Immunology
Virology
Cellular Biology

Background:

Human cytomegalovirus (HCMV) is a common cause of serious infection in immunocompromised individuals, particularly transplant recipients.
Adoptive transfer of HCMV-specific T cells is a promising immunotherapy to restore anti-HCMV immunity.
The heterogeneity of CD8+ T cell subsets and their roles in HCMV immunity are not fully understood in the context of current therapies.

Approach:

This review summarizes the distinct functions and localizations of HCMV-specific CD8+ T cell subsets.
It examines how current adoptive immunotherapy protocols may impact the reconstitution of these diverse T cell populations.
The focus is on terminally differentiated effector cells, self-renewing memory cells, and tissue-resident memory T cells.

Key Points:

Terminally differentiated effector CD8+ T cells provide immediate but short-lived responses.
Self-renewing memory CD8+ T cells are crucial for sustained immunity against HCMV.
Tissue-resident memory T cells in mucosal sites are vital for controlling reactivation but do not recirculate.

Conclusions:

Current adoptive immunotherapy may not adequately reconstitute the full spectrum of HCMV-specific CD8+ T cell immunity.
Future strategies should aim to balance the generation of different T cell subsets for durable and protective responses.
Optimizing T cell subset reconstitution is essential for preventing HCMV disease in vulnerable populations.