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MDM2 E3 ligase-mediated ubiquitination and degradation of HDAC1 in vascular calcification

Duk-Hwa Kwon1, Gwang Hyeon Eom1, Jeong Hyeon Ko1

  • 1Department of Pharmacology and Medical Research Center for Gene Regulation, Chonnam National University Medical School, 5 Hak-dong, Dong-ku, Gwangju 501-746, Republic of Korea.

Nature Communications
|February 3, 2016
PubMed

Insights

MDM2-induced ubiquitination of histone deacetylase 1 (HDAC1) drives vascular calcification. Inhibiting this process, by targeting MDM2 or HDAC1, offers a new therapeutic strategy for cardiovascular and metabolic diseases.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Vascular calcification (VC) is linked to cardiovascular and metabolic diseases, but its molecular drivers are unclear.
  • Understanding the mechanisms of VC is crucial for developing effective treatments.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying vascular calcification.
  • To identify novel therapeutic targets for VC.

Main Methods:

  • Investigated the role of histone deacetylase 1 (HDAC1) and MDM2 in VC using cell and animal models.
  • Utilized chemical inhibitors and genetic ablation to study HDAC1 and MDM2 function.
  • Examined HDAC1 ubiquitination at K74 and its proteasomal degradation.

Main Results:

  • Loss of HDAC1 activity exacerbates VC.
  • HDAC1 protein levels decrease in VC models and human calcified arteries.
  • MDM2 E3 ubiquitin ligase mediates HDAC1 ubiquitination at K74, leading to its proteasomal degradation and promoting VC.
  • MDM2 overexpression enhances VC, while MDM2 inhibition or decoy peptides targeting HDAC1 K74 reduce VC.

Conclusions:

  • MDM2-mediated ubiquitination and degradation of HDAC1 is a key pathway in vascular calcification.
  • Targeting the MDM2-HDAC1 ubiquitination axis presents a promising therapeutic strategy for VC and associated diseases.

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