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Updated: Jul 19, 2025
Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation
Published on: May 31, 2016
Exploring molecular profiles of calcification in aortic vascular smooth muscle cells and aortic valvular interstitial
Julie R Kessler1, Theresa S Bluemn1, Samuel A DeCero1
1Department of Pediatrics, Section of Pediatric Cardiology, Medical College of Wisconsin, Milwaukee, WI, USA; The Herma Heart Institute, Children's Wisconsin, Milwaukee, WI, USA.
Insights
Cardiovascular calcification in blood vessels and heart valves differs at the cellular level, despite similar clinical treatment. Understanding these diverse pathways is key to developing targeted therapies for conditions like coronary artery calcification and calcific aortic valve disease.
Area of Science:
- Biochemistry
- Cell Biology
- Cardiovascular Research
Background:
- Cardiovascular calcification, involving calcium deposition and mineralization, stiffens vessels and valves, impairing function.
- Chronic kidney disease and hyperphosphatemia increase risk for coronary artery calcification (CAC) and calcific aortic valve disease (CAVD).
- Despite clinical similarities, vascular and valvular calcification may have distinct underlying pathobiology.
Purpose of the Study:
- To investigate cell-specific molecular and cellular responses to hyperphosphatemia-induced calcification in aortic vascular smooth muscle cells (AVSMCs) and aortic valve interstitial cells (AVICs).
- To compare hyperphosphatemia-induced calcification with calcification induced by osteogenic media (OM).
Main Methods:
- AVSMCs and AVICs were exposed to high phosphate (2.5 mM) or OM in vitro.
- Bulk RNA-sequencing was used to analyze cell-specific gene expression and signaling pathways.
- Cellular responses and osteogenic markers were examined.
Main Results:
- AVSMCs demonstrated higher susceptibility to calcification than AVICs.
- Both cell types activated ossification programs under high phosphate or OM, but with distinct signaling pathways, cellular processes, and markers.
- VIC calcification involved osteo-chondrogenic differentiation and actin cytoskeleton gene downregulation, unlike VSMCs.
- Hyperphosphatemia-induced calcification in both cell types was independent of PI3K signaling, unlike OM-induced calcification.
Conclusions:
- Cardiovascular calcification pathogenesis is more diverse than previously recognized, with distinct cell- and treatment-specific mechanisms.
- Findings highlight the need for tailored therapeutic strategies for vascular versus valvular calcification.
- The study provides valuable insights into the molecular underpinnings of hyperphosphatemia-induced cardiovascular calcification.
Abstract:
Cardiovascular calcification can occur in vascular and valvular structures and is commonly associated with calcium deposition and tissue mineralization leading to stiffness and dysfunction. Patients with chronic kidney disease and associated hyperphosphatemia have an elevated risk for coronary artery calcification (CAC) and calcific aortic valve disease (CAVD). However, there is mounting evidence to suggest that the susceptibility and pathobiology of calcification in these two cardiovascular structures may be different, yet clinically they are similarly treated. To better understand diversity in molecular and cellular processes that underlie hyperphosphatemia-induced calcification in vascular and valvular structures, we exposed aortic vascular smooth muscle cells (AVSMCs) and aortic valve interstitial cells (AVICs) to high (2.5 mM) phosphate (Ph) conditions in vitro, and examined cell-specific responses. To further identify hyperphosphatemic-specific responses, parallel studies were performed using osteogenic media (OM) as an alternative calcific stimulus. Consistent with clinical observations made by others, we show that AVSMCs are more susceptible to calcification than AVICs. In addition, bulk RNA-sequencing reveals that AVSMCs and AVICs activate robust ossification-programs in response to high phosphate or OM treatments, however, the signaling pathways, cellular processes and osteogenic-associated markers involved are cell- and treatment-specific. For example, compared to VSMCs, VIC-mediated calcification involves biological processes related to osteo-chondro differentiation and down regulation of 'actin cytoskeleton'-related genes, that are not observed in VSMCs. Furthermore, hyperphosphatemic-induced calcification in AVICs and AVSMCs is independent of P13K signaling, which plays a role in OM-treated cells. Together, this study provides a wealth of information suggesting that the pathogenesis of cardiovascular calcifications is significantly more diverse than previously appreciated.
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