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Autoimmune regulator (AIRE): Takes a hypoxia-inducing factor 1A (HIF1A) route to regulate FOXP3 expression in PCOS.

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Polycystic ovary syndrome (PCOS) involves reduced autoimmune regulator (AIRE) gene expression, leading to increased HIF1A and decreased FOXP3, causing regulatory T cell (Treg) insufficiency in patients.

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Area of Science:

  • Immunology
  • Endocrinology
  • Genetics

Background:

  • Autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED) is linked to autoimmune regulator (AIRE) mutations, causing immune dysregulation.
  • Polycystic ovary syndrome (PCOS) is associated with immune system dysfunction, potentially involving reduced regulatory T cells (Tregs).
  • The specific role of AIRE gene expression and its interaction with the HIF1A-FOXP3 axis in PCOS-related Treg insufficiency remains unclear.

Purpose of the Study:

  • To investigate the expression levels of AIRE and HIF1A in peripheral blood mononuclear cells (PBMCs) of women with PCOS compared to healthy controls.
  • To elucidate the regulatory relationship between AIRE, HIF1A, and FOXP3 in the context of PCOS.
  • To determine the impact of AIRE expression on T cell to Treg conversion in PCOS.

Main Methods:

  • A case-control cohort study involving 40 PCOS patients and 40 healthy volunteers.
  • Quantitative real-time PCR (qRT-PCR) and Western blot analysis to assess AIRE and HIF1A expression.
  • Flow cytometry (FACS) analysis of PBMCs after AIRE silencing to evaluate Treg induction and FOXP3 expression.

Main Results:

  • PCOS patients exhibited significantly reduced AIRE expression (fold change log2 (RQ) = -2.6, P < .01) and increased HIF1A expression (fold change log2 (RQ) = 3.6, P < .02) in PBMCs.
  • AIRE directly regulates HIF1A promoter activity; silencing AIRE in PBMCs upregulated HIF1A (two-fold, P < .0015) and downregulated FOXP3 (three-fold, P < .0017).
  • Silencing AIRE in PBMCs led to a reduction in T cell to Treg conversion.

Conclusions:

  • A novel AIRE-HIF1A-FOXP3 axis is implicated in PCOS pathogenesis.
  • Reduced AIRE expression in PCOS contributes to increased HIF1A, subsequently decreasing FOXP3 expression and leading to Treg insufficiency.
  • This pathway provides a potential molecular mechanism underlying immune dysregulation in PCOS.