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P2Y2R deficiency attenuates experimental autoimmune uveitis development.

Lia Judice M Relvas1, Maya Makhoul2, Remi Dewispelaere1

  • 1Dpt of Ophthalmology, CHU St-Pierre and Brugmann, Brussels, Belgium; The Institute of Interdisciplinary Research, IRIBHM, Brussels, Belgium; Université Libre de Bruxelles, Brussels, Belgium.

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Mice lacking the P2Y2 receptor (P2Y2-/-) showed reduced experimental autoimmune uveitis (EAU) severity. This suggests P2Y2 receptor plays a key role in autoimmune responses and EAU development.

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Area of Science:

  • Immunology
  • Ophthalmology
  • Molecular Biology

Background:

  • Experimental autoimmune uveitis (EAU) is an immune-mediated disease affecting the eye.
  • The nucleotide receptor P2Y2R's role in EAU pathogenesis is not fully understood.

Purpose of the Study:

  • To investigate the involvement of the P2Y2 receptor (P2Y2R) in the development of experimental autoimmune uveitis (EAU).

Main Methods:

  • EAU was induced in P2Y2+/+ and P2Y2-/- mice via immunization or adoptive T cell transfer.
  • Disease severity was assessed using clinical and histological scores.
  • T cell proliferation and cytokine secretion were analyzed.
  • Flow cytometry was used for cell phenotype analysis.

Main Results:

  • P2Y2-/- mice exhibited significantly decreased clinical and histological scores for EAU.
  • Adoptive transfer of T cells from P2Y2-/- mice also reduced EAU severity in recipient mice.
  • Restimulated P2Y2-/- T cells showed reduced proliferation and cytokine secretion compared to P2Y2+/+ T cells.
  • Antigen-presenting cells from P2Y2-/- mice were identified as responsible for the proliferation defect.

Conclusions:

  • Mice deficient in P2Y2R are less susceptible to developing autoimmune responses against IRBP.
  • The P2Y2 receptor plays a critical role in the development of EAU.
  • Findings align with the danger model, linking autoreactive lymphocyte activation, migration, and danger signals like extracellular nucleotides.