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Dysfunctional APPL1-Mediated Epigenetic Regulation in Diabetic Vascular Injury.

Yunhui Du1, Yanru Duan1, Jianli Zhao2

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Summary

Adiponectin (APN) and APPL1 protect blood vessels, but diabetes impairs this. APN restores APPL1 function, inhibiting HDAC2 and boosting protective genes like Angpt1, Ocln, and Cav1, crucial for preventing diabetic vascular damage.

Keywords:
adiponectinangiopoietinscaveolinsdietvascular system injuries

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Vascular Biology

Background:

  • Adiponectin (APN) and APPL1 are vital for vascular health, but their deficiency contributes to diabetic vascular complications.
  • The precise molecular mechanisms by which APN and APPL1 regulate vasculoprotective genes and how diabetes affects these processes remain unclear.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying APN and APPL1's vasculoprotective effects in the context of diabetes.
  • To identify key genes regulated by APN/APPL1 and their alterations in diabetic conditions.

Main Methods:

  • Utilized diabetic cell models (rat and human aortic endothelial cells) and in vivo models (diabetic vascular injury, hindlimb ischemia).
  • Investigated APN-induced APPL1 nuclear translocation, interaction with HDAC2, and epigenetic modifications (H3Kac27).
  • Employed transcriptomics, bioinformatics, ChIP-qPCR, and gene knockdown/knockout strategies to assess gene regulation and functional outcomes.

Main Results:

  • APN replenishment promoted APPL1 nuclear translocation, leading to HDAC2 inhibition and increased H3K27 acetylation.
  • Angpt1, Ocln, and Cav1 were identified as key diabetes-suppressed, APN-rescued vasculoprotective genes, regulated by APN/APPL1.
  • Cav1 acts upstream of Angpt1/Ocln in the APN-mediated pathway, and APN's protective effects were dependent on APPL1 and Cav1, and inhibited by HDAC2.

Conclusions:

  • Hypoadiponectinemia and disrupted APPL1-mediated epigenetic regulation are novel contributors to diabetes-induced suppression of vasculoprotective gene expression.
  • Interventions that promote APPL1 nuclear translocation and inhibit HDAC2 may prevent diabetes-induced pathological vascular remodeling.