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Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation
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Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation

Published on: May 31, 2016

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Restoration of microRNA-30b expression alleviates vascular calcification through the mTOR signaling pathway and

Tian-Hua Xu1, Xiao-Bo Qiu1, Zi-Tong Sheng1

  • 1Department of Nephrology, The First Hospital of China Medical University, Shenyang, P. R. China.

Journal of Cellular Physiology
|February 1, 2019
PubMed

Insights

MicroRNA-30b (miR-30b) inhibits vascular calcification (VC) in chronic kidney disease (CKD) by targeting SOX9 and the mTOR pathway. This finding highlights miR-30b as a potential therapeutic target for reducing VC progression in CKD patients.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Nephrology

Background:

  • Pathological calcification, particularly vascular calcification (VC), significantly increases morbidity and mortality in chronic kidney disease (CKD) patients, often linked to hyperphosphatemia.
  • Epigenomic regulation by microRNAs (miRNAs) is implicated in ectopic calcification, but precise molecular mechanisms remain elusive.
  • Understanding these mechanisms is crucial for developing targeted therapies for CKD-related cardiovascular complications.

Purpose of the Study:

  • To identify specific microRNAs (miRNAs) involved in the development and progression of vascular calcification (VC).
  • To elucidate the molecular mechanisms by which miR-30b influences VC in the context of chronic kidney disease (CKD).
  • To evaluate the therapeutic potential of modulating miR-30b for treating hyperphosphatemia-induced VC.

Main Methods:

  • In vitro studies using vascular smooth muscle cells (VSMCs) to assess autophagy and VC markers following miR-30b manipulation (restoration or knockdown) in response to β-glycerophosphate.
  • In vivo assessment of VC in a rat model of CKD (5/6 nephrectomy and high phosphorus diet), quantified by Alizarin Red staining of aortic calcification.
  • Luciferase reporter assays to confirm SOX9 as a direct target of miR-30b, alongside Western blotting and pathway analysis (mTOR signaling).

Main Results:

  • Restoration of miR-30b significantly decreased SOX9 expression and inhibited the mTOR signaling pathway, thereby reducing VC.
  • Knockdown of miR-30b led to reduced mitochondrial membrane potential (MMP) and autophagy, increased VC, and suppressed the effects of rapamycin (mTOR inhibitor).
  • Upregulated miR-30b expression effectively attenuated in vivo VC in the rat CKD model.

Conclusions:

  • MiR-30b plays a critical inhibitory role in vascular calcification (VC).
  • The miR-30b/SOX9/mTOR signaling pathway is a key regulator of VC in the context of hyperphosphatemia and CKD.
  • MiR-30b represents a promising therapeutic target for mitigating progressive VC in CKD patients.
Keywords:
autophagychronic kidney diseasehigh phosphorusmicroRNA-30bvascular calcification

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