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Distinctive CD26 Expression on CD4 T-Cell Subsets.

Oscar J Cordero1, Carlos Rafael-Vidal2,3, Rubén Varela-Calviño1

  • 1Department of Biochemistry and Molecular Biology, Campus Vida, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain.

Biomolecules
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PubMed
Summary
This summary is machine-generated.

High CD26 expression on CD4 T cells is linked to anti-tumor activity. This study clarifies CD26 expression in T helper subsets, aiding chimeric antigen receptor (CAR)-T cell therapy research.

Keywords:
DPP4T cell memoryT helper polarizationsoluble CD26

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • CD4 T-cells expressing high CD26 exhibit anti-tumoral properties and are key in chimeric antigen receptor (CAR)-T cell therapies against solid cancers.
  • CD26 is also found as soluble sCD26 in biological fluids, with serum levels correlating to T cell subsets, but its relation to enzymatic activity and cell-surface expression is unclear.

Purpose of the Study:

  • To investigate the relationship between cell-surface CD26 expression, soluble sCD26, and dipeptidyl peptidase 4 (DPP4) enzymatic activity in CD4 T cells.
  • To analyze CD26 expression patterns in different human CD4 T helper cell subsets under various polarization conditions.

Main Methods:

  • Ex vivo analysis of cell-surface CD26 on circulating lymphocytes.
  • In vitro studies of surface and intracellular CD26 expression in cultured CD4 T cells under different polarization states (Th1, Th2, Th17, Th22, Th0).
  • Analysis of sCD26 levels in the secretomes of cultured T cells.

Main Results:

  • CD26-negative CD4 T cells are predominantly central memory (TCM) cells, while CD26high expression is found in effector Th1, Th2, Th17, and effector memory (TEM) cells.
  • Significant percentages of Th1, Th2, Th17, and Th22 cells were CD26-negative.
  • In vitro polarization mirrored ex vivo CD45R0 and CD26 expression patterns.
  • sCD26 was present in all secretomes, with levels generally lower in polarized cells compared to the Th0 condition.

Conclusions:

  • The study refines understanding of CD26 expression across T helper subsets, potentially improving CAR-T cell therapy design.
  • Observed differences in sCD26 levels across T cell subsets may influence the physiological roles of sCD26/DPP4.