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Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation
08:43

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

Published on: May 31, 2016

Statins protect human aortic smooth muscle cells from inorganic phosphate-induced calcification by restoring Gas6-Axl

Bo-Kyung Son1, Koichi Kozaki, Katsuya Iijima

  • 1Department of Geriatric Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan.

Circulation Research
|March 25, 2006
PubMed

Insights

Statins prevent vascular calcification by inhibiting apoptosis in human aortic smooth muscle cells. This effect is mediated by restoring the Gas6-Axl pathway, crucial for cell survival.

Area of Science:

  • Cardiovascular Biology
  • Cellular and Molecular Medicine
  • Pharmacology

Background:

  • Vascular calcification is a key factor in cardiovascular disease development.
  • Statins (HMG CoA reductase inhibitors) show potential in inhibiting vascular calcification, but mechanisms remain unclear.
  • Apoptosis is increasingly recognized as a regulator of vascular smooth muscle cell (VSMC) calcification.

Purpose of the Study:

  • To investigate the effect of statins on VSMC calcification.
  • To elucidate the role of apoptosis and the Gas6-Axl pathway in statin-mediated inhibition of vascular calcification.

Main Methods:

  • Used human aortic smooth muscle cells (HASMC) treated with inorganic phosphate (Pi) and statins.
  • Assessed calcification, apoptosis, sodium-dependent phosphate cotransporter (NPC) activity, and Gas6/Axl pathway expression.
  • Utilized small interfering RNA (siRNA) to suppress Gas6 and Axl function.

Main Results:

  • Statins significantly inhibited Pi-induced HASMC calcification in a dose-dependent manner.
  • Statin's inhibitory effect was linked to preventing Pi-induced apoptosis, not altering NPC activity.
  • Statins restored Gas6 expression, which was downregulated by Pi, via mRNA stabilization.
  • Suppression of Gas6 or Axl abolished the protective effects of statins.

Conclusions:

  • Statins protect HASMC from Pi-induced calcification by inhibiting apoptosis.
  • The mechanism involves the restoration of the Gas6-Axl survival pathway.
  • Targeting the Gas6-Axl pathway may offer therapeutic strategies for vascular calcification.

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