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Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation
Published on: May 31, 2016
Nitric oxide regulates vascular calcification by interfering with TGF- signalling
Yosuke Kanno1, Takeshi Into, Charles J Lowenstein
1Department of Oral Disease Research, National Center for Geriatrics and Gerontology, 36-3 Gengo, Morioka-cho, Obu, Aichi 474-8511, Japan.
Cardiovascular Research
|November 17, 2007
Summary
Nitric oxide (NO) inhibits vascular calcification by preventing smooth muscle cells from becoming bone-like cells. This NO-mediated pathway, involving cyclic guanosine monophosphate (cGMP), may reduce cardiovascular disease risk.
Area of Science:
- Vascular Biology
- Cellular Signaling
- Cardiovascular Research
Background:
- Vascular calcification is linked to aging, atherosclerosis, diabetes, and kidney disease, increasing cardiovascular mortality.
- Nitric oxide (NO) is vital for vascular health, but its role in vascular calcification is not fully understood.
Purpose of the Study:
- To investigate the effect of nitric oxide (NO) on vascular calcification.
- To elucidate the molecular mechanisms underlying NO's influence on vascular smooth muscle cell (VSMC) differentiation.
Main Methods:
- Murine VSMCs were used to assess calcification and osteoblastic differentiation.
- Measurements included calcium concentration, alkaline phosphatase activity, and gene expression.
- Smad2/3 phosphorylation and TGF-beta signaling pathway components were analyzed via RT-PCR and Western blotting.
Main Results:
- Nitric oxide (NO) significantly inhibited VSMC calcification and osteoblastic differentiation.
- Inhibition of NO's effect was observed when a cGMP-dependent protein kinase inhibitor was used.
- NO suppressed transforming growth factor-beta (TGF-beta)-induced Smad2/3 phosphorylation and target gene expression, including ALK5.
Conclusions:
- NO prevents VSMC osteoblastic differentiation and calcification via a cGMP-dependent inhibition of TGF-beta signaling.
- These findings suggest a protective role for NO in limiting vascular calcification and potentially mitigating atherogenesis.
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