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The study investigates how CD4 T cells acquire innate capabilities upon activation through TCR and CD28 stimulation.

February 2, 2026Open Access

CD4 T Cells Acquire Innate Capability Upon Classical T Cell Activation

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Research reveals CD4 T cells can perform innate functions, enhancing immune responses across various diseases.

The study investigates how CD4 T cells acquire innate capabilities upon activation through TCR and CD28 stimulation.
Examined naïve murine and human CD4 T cells under TCR and CD28 co-stimulation conditions.
Conducted adoptive transfer of in vitro-induced T IA cells in mouse models.
Assessed IFN-γ responses during Legionella pneumophila infections.
Identified a presence of CD4 T IA cells in multiple disease contexts.
Demonstrated TCR-independent IFN-γ production from activated CD4 T cells.
Showed that T IA cells can respond during the innate phase of infections.

Yassini et al. (2025) studied this question.

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