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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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Related Experiment Video

Updated: Apr 15, 2026

Measurement of T Cell Alloreactivity Using Imaging Flow Cytometry

Measurement of T Cell Alloreactivity Using Imaging Flow Cytometry

Published on: April 19, 2017

Auto-reactive T cells revised. Overestimation based on methodology?

Gorm Thorlacius-Ussing¹, Jesper F Sørensen¹, Hans H Wandall²

¹Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, Denmark.

Journal of Immunological Methods

|April 1, 2015

Summary

Novel immunoassays detect rare T cells, but current methods may overstate autoreactivity. This research questions whether in vitro findings reflect true in vivo self-antigen recognition, impacting autoimmune and cancer research.

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Last Updated: Apr 15, 2026

Measurement of T Cell Alloreactivity Using Imaging Flow Cytometry

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Area of Science:

Immunology
Cellular Biology

Background:

Autoreactive T cells are increasingly detected in autoimmune diseases, cancer, and healthy individuals using novel immunoassays.
Current understanding suggests regulatory T cells (Tregs) normally suppress autoreactivity, with dysfunction potentially leading to disease.
Studies often use unmodified proteins or peptides, potentially overlooking crucial biological complexities.

Discussion:

The methodology for identifying autoreactive T cells may induce responses to neo-epitopes rather than true self-antigens.
This includes ignoring natural genetic variations and post-translational modifications like glycosylation.
This methodological limitation could lead to misinterpretation of T cell reactivity data.

Key Insights:

In vitro T cell activation against unmodified antigens might not represent genuine in vivo autoreactivity.
Overinterpretation of autoreactive T cell frequencies is a concern in autoimmunity and cancer research.
Naïve T cells with self-antigen specificity in healthy individuals may be overestimated due to methodology.

Outlook:

Re-evaluation of experimental approaches is needed to accurately assess T cell responses.
Developing assays that incorporate protein modifications is crucial for precise immunological studies.
This could refine our understanding of immune tolerance and disease pathogenesis.