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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.
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Cytotoxic T Cells-mediated Immune Response

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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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Lymphoid Cells and Tissues

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Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
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Related Experiment Video

Updated: Jun 2, 2026

Lymphocyte Isolation from Human Skin for Phenotypic Analysis and Ex Vivo Cell Culture

Lymphocyte Isolation from Human Skin for Phenotypic Analysis and Ex Vivo Cell Culture

Published on: April 8, 2016

Dendritic cells and cutaneous T-cell lymphomas.

X Ni¹, M Duvic

¹Department of Dermatology, University of Texas-MD Anderson Cancer Center, Houston, TX, USA. xiaoni@mdanderson.org

Giornale Italiano Di Dermatologia E Venereologia : Organo Ufficiale, Societa Italiana Di Dermatologia E Sifilografia

|April 21, 2011

Summary

Dendritic cells (DCs) play a dual role in cutaneous T cell lymphomas (CTCLs). Understanding their function is key to developing new therapies for CTCLs and Sézary syndrome.

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Area of Science:

Immunology
Dermatology
Oncology

Background:

Dendritic cells (DCs) are crucial antigen-presenting cells orchestrating immune responses.
DC subtypes vary across tissues, including Langerhans cells (LCs), dermal dendritic cells (DDCs), and plasmacytoid dendritic cells (pDCs) in the skin.
DC dysfunction is implicated in autoimmune disorders, allergies, and cancers.

Purpose of the Study:

To explore the role of dendritic cells (DCs) in the pathogenesis of cutaneous T cell lymphomas (CTCLs).
To investigate the implications of abnormal DC number and function in Sézary syndrome (SS), a CTCL variant.

Main Methods:

Review of existing literature on dendritic cells and their involvement in CTCLs.
Analysis of therapeutic strategies such as extracorporeal photopheresis (ECP) and DC vaccination in CTCL treatment.
Examination of the dual role of DCs in CTCL pathogenesis.

Main Results:

Abnormalities in DC number and function are observed in advanced Sézary syndrome.
Extracorporeal photopheresis (ECP) may exert therapeutic effects by targeting DCs.
DC vaccination, combined with immune modifiers, shows promise in CTCL treatment.

Conclusions:

Dendritic cells (DCs) have a complex, potentially dual role in CTCL pathogenesis.
Immature DCs, like Langerhans cells, may support malignant T cell survival.
Further research into DC function in CTCLs can elucidate disease mechanisms and guide novel therapeutic strategies.