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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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Methodological Insights Into T-Cell Activation: CD3/CD28 Versus PMA/Ionomycin Stimulation.

Nekruz Abdulhaqov^1,2, Lady Tatiana Albarracin Melo¹, Ines Meinert¹

¹Medical Faculty, Institute for Clinical Immunology and Cell Therapeutics, Otto-von-Guericke University, Magdeburg, Germany.

European Journal of Immunology

|June 17, 2026

Summary

This summary is machine-generated.

Pharmacological (PMA/ionomycin) and receptor-mediated (CD3/CD28) T-cell activation trigger distinct signaling pathways. CD3/CD28 activates ERK and IL-2/STAT5, while PMA/ionomycin primarily drives ERK-dependent proliferation.

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Area of Science:

Immunology
Cellular Signaling
Molecular Biology

Background:

T-cell activation is crucial for adaptive immunity.
Distinct stimuli can elicit different cellular responses.
Understanding T-cell activation pathways informs therapeutic strategies.

Purpose of the Study:

To compare the distinct signaling programs induced by pharmacological (PMA/ionomycin) and receptor-mediated (CD3/CD28) stimulation in primary human T cells.
To elucidate the mechanistic differences in T-cell responses to these activation methods.

Main Methods:

Primary human T cells were stimulated using PMA/ionomycin and CD3/CD28 antibodies.
Signaling pathway activation (ERK, IL-2/STAT5) and cellular responses (proliferation, CD25 upregulation) were analyzed.

Main Results:

CD3/CD28 stimulation activated both ERK and IL-2/STAT5 signaling pathways.
PMA/ionomycin predominantly induced ERK-dependent proliferation, despite robust IL-2 production and CD25 upregulation.
Distinct signaling profiles were observed between the two activation methods.

Conclusions:

Pharmacological and receptor-mediated T-cell activation induce fundamentally different signaling programs.
Methodological choices significantly impact observed T-cell activation outcomes.
These findings highlight mechanistic differences critical for interpreting T-cell activation studies.