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Area of Science:

  • Endothelial cell biology
  • Aging research
  • Vascular homeostasis

Background:

  • Endothelial senescence contributes to age-related cardiovascular disease.
  • Phosphatase 1 Nuclear Targeting Subunit (PNUTS) is implicated in cardiomyocyte aging.
  • The role of PNUTS in endothelial cell aging requires investigation.

Purpose of the Study:

  • To elucidate the function of PNUTS in endothelial cell aging and homeostasis.
  • To identify downstream pathways regulated by PNUTS in endothelial cells.
  • To explore potential therapeutic targets for age-related endothelial dysfunction.

Main Methods:

  • PNUTS silencing in human umbilical vein endothelial cells (HUVECs).
  • Generation and analysis of endothelial-specific inducible PNUTS-deficient mice (PNUTSEC-KO).
  • Transcriptomic analysis (RNA-seq) of silenced HUVECs and mouse lung tissue.
  • Assessment of endothelial senescence, angiogenesis, barrier function, and organ integrity.

Main Results:

  • PNUTS expression is reduced in senescent endothelial cells.
  • PNUTS deficiency in vitro and in vivo recapitulates hallmarks of endothelial aging, including senescence and barrier dysfunction.
  • PNUTS deletion in mice leads to multiorgan failure and vascular leakage.
  • The PNUTS-PP1 complex regulates semaphorin 3B (SEMA3B) expression.
  • SEMA3B knockdown rescues endothelial barrier function following PNUTS loss.

Conclusions:

  • PNUTS plays a critical role in maintaining endothelial cell homeostasis and preventing premature aging.
  • The PNUTS-SEMA3B axis is a key regulator of endothelial barrier integrity.
  • Targeting the PNUTS-SEMA3B pathway offers a potential strategy to combat age-related endothelial dysfunction and vascular diseases.