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Fibulin 2 Deficiency Drives Epigenetic Hypertension.

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Fibulin 2 (FBLN2) deficiency drives hypertension by altering histone modifications in kidney cells. FBLN2 treatment restored normal blood pressure and sodium excretion, offering a potential therapeutic strategy for salt-sensitive hypertension.

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Area of Science:

  • Epigenetics
  • Nephrology
  • Cardiovascular Science

Background:

  • Epigenetic modifications of histones are crucial in embryonic development but their role in hypertension pathogenesis is unclear.
  • Histone 3 modification, specifically H3K27me3, in renal tubule cells is investigated for its role in regulating sodium excretion and blood pressure.

Purpose of the Study:

  • To investigate the role of histone 3 modification (H3K27me3) in renal tubule cells in regulating sodium excretion and blood pressure.
  • To explore the mechanistic link between KDM6A, H3K27me3, FBLN2, and epigenetic hypertension.

Main Methods:

  • Generated a mouse model with inducible renal tubule cell-specific deletion of KDM6A (KDM6A cKO).
  • Utilized ChIP-seq analysis to examine H3K27me3 enrichment at the FBLN2 gene promoter.
  • Administered recombinant FBLN2 (rFBLN2) to KDM6A cKO mice to assess its therapeutic potential.

Main Results:

  • KDM6A deletion led to increased H3K27me3 at the FBLN2 promoter, downregulating FBLN2 expression.
  • rFBLN2 treatment attenuated hypertension, improved sodium excretion, and prevented salt-sensitive hypertension in KDM6A cKO mice.
  • rFBLN2 normalized NCC, AQP2, and NKCC2 expression in renal tubules and potentially regulates NCC trafficking.

Conclusions:

  • FBLN2 plays a critical role in regulating renal sodium excretion and blood pressure.
  • FBLN2 deficiency contributes to KDM6A deficiency-induced epigenetic hypertension.
  • FBLN2 treatment presents a potential preventive and therapeutic strategy for salt-sensitive hypertension.