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Mitochondrial CypD Acetylation Promotes Endothelial Dysfunction and Hypertension.

Anna Dikalova1, Daniel Fehrenbach1, Vladimir Mayorov2

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Mitochondrial protein CypD acetylation at K166 contributes to hypertension and endothelial dysfunction. Targeting this acetylation pathway may offer new treatments for cardiovascular disease.

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Area of Science:

  • Cardiovascular Science
  • Mitochondrial Biology
  • Hypertension Research

Background:

  • Hypertension affects nearly half of adults, posing a significant cardiovascular disease risk.
  • Mitochondrial hyperacetylation is implicated in hypertension, but specific protein roles remain unclear.
  • This study investigates the role of cyclophilin D (CypD) acetylation at K166 in endothelial dysfunction and hypertension.

Purpose of the Study:

  • To determine if CypD acetylation at K166 contributes to endothelial dysfunction and hypertension.
  • To elucidate the regulatory mechanisms of CypD acetylation involving GCN5L1 and Sirt3.
  • To evaluate potential therapeutic strategies targeting CypD acetylation.

Main Methods:

  • Studied CypD acetylation in hypertensive patients and utilized CypD-K166R mutant and endothelial-specific GCN5L1-deficient mice.
  • Employed an angiotensin II (Ang II) model of hypertension.
  • Assessed mitochondrial protein acetylation, oxidative stress, endothelial function, and vascular metabolism.

Main Results:

  • Hypertensive patients showed increased CypD acetylation, reduced Sirt3, and elevated GCN5L1.
  • CypD-K166R mutant mice were protected against Ang II-induced hypertension and endothelial dysfunction.
  • GCN5L1 depletion in endothelial cells prevented Ang II-induced oxidative stress and preserved endothelial function.

Conclusions:

  • CypD acetylation at K166 plays a pathogenic role in endothelial dysfunction and hypertension.
  • Targeting mitochondrial isolevuglandins and GCN5L1 may reduce CypD acetylation.
  • These findings suggest potential therapeutic benefits for cardiovascular disease.