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Updated: Jan 20, 2026

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Modulation of CD4 T cell function via CD6-targeting.

Raquel Filipa Freitas1, Afonso Basto1, Silvia C P Almeida1

  • 1Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal; Instituto Gulbenkian de Ciência, Oeiras, Portugal.

Ebiomedicine
|September 5, 2019
PubMed
Summary
This summary is machine-generated.

Targeting CD6 molecules impacts T cell specialization, preventing Treg differentiation and promoting Th1 polarization. This explains paradoxical dose-dependent effects observed in anti-CD6 therapies.

Keywords:
CD4 T cellsCD6EAEFoxp3T-cell polarizationTreg cells

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Area of Science:

  • Immunology
  • Cellular Biology
  • Therapeutic Drug Development

Background:

  • Immune synapse molecules are key targets for therapeutic immune modulation.
  • CD6, present on CD4 T cells, has controversial biological roles despite extensive study.

Purpose of the Study:

  • To investigate the effects of targeting CD6 domain 1 using murine and human antibodies.
  • To elucidate the impact of CD6 targeting on CD4 T cell functional specialization.

Main Methods:

  • In vitro studies using murine and human CD4 T cells.
  • Administration of anti-CD6 antibodies at varying doses.
  • Analysis of T cell differentiation towards Treg, Th1, Th2, and Th17 fates.

Main Results:

  • Anti-CD6 antibodies dose-dependently inhibited Foxp3+ Treg differentiation.
  • Th1 cell polarization was favored by CD6 targeting.
  • No significant impact was observed on Th2 or Th17 cell differentiation.
  • In vitro findings explain paradoxical dose-dependent outcomes in vivo, where high doses lose anti-inflammatory effects.

Conclusions:

  • Targeting CD6 significantly alters CD4 T cell functional specialization.
  • Therapeutic immune synapse targeting can yield paradoxical dose-dependent effects due to T cell fate modification.
  • Understanding CD6 biology is crucial for optimizing immunomodulatory therapies.