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Calcified Tissue International

Erschienen in:

01.04.2015 | Original Research

Rat Aortic Smooth Muscle Cells Cultured on Hydroxyapatite Differentiate into Osteoblast-Like Cells via BMP-2–SMAD-5 Pathway

verfasst von: Pranjal Nahar-Gohad, Neeraj Gohad, Chen-Chih Tsai, Rajendra Bordia, Naren Vyavahare

Erschienen in: Calcified Tissue International | Ausgabe 4/2015

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Abstract

Vascular calcification is an important pathological condition associated with increased risk of cardiovascular mortality. Hydroxyapatite (HA) found in such deposits is the same polymorph of calcium (Ca) found in bone, indicating calcification may involve mechanisms akin to bone formation. Vascular smooth muscle cells (Vsmcs) have been shown to undergo phenotypic change to osteoblast-like cells. However, the mechanisms underlying this phenotypic change are unclear, and whether the stimulus to become osteogenic is a result of loss of mineralization inhibitors or early mineral deposits is not known. Our aim in this study is to identify mechanisms and signal transduction pathways that cause differentiation of Vsmcs into osteoblast-like cells in the presence of HA. We first characterized vascular origin of Vsmcs by studying the expression of smooth muscle cell markers: myosin heavy chain and smooth muscle actin along with SM22α at both mRNA and protein levels. Vsmcs grown on HA exhibited progressive change in cellular morphology at 3-, 7-, and 14-day time points. Culturing of Vsmcs on HA disc resulted in decrease in media Ca levels and increased expression of Ca-sensing receptor (CaSR) on Vsmcs resulting in upregulation of intracellular CaSR signaling leading to increased BMP-2 secretion. BMP-2 pathway mediated differentiation of Vsmcs to osteoblast-like cells shown by expression of osteogenic markers like runt-related transcription factor 2, osteocalcin, and alkaline phosphatase at mRNA and protein levels. Blocking CaSR by NPS-2143 reduced BMP-2 secretion and blocking the BMP-2 pathway by LDN-193189, a BMP inhibitor, modulated expression of osteogenic markers confirming their role in osteogenesis of Vsmcs.

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Titel: Rat Aortic Smooth Muscle Cells Cultured on Hydroxyapatite Differentiate into Osteoblast-Like Cells via BMP-2–SMAD-5 Pathway
verfasst von: Pranjal Nahar-Gohad
Neeraj Gohad
Chen-Chih Tsai
Rajendra Bordia
Naren Vyavahare
Publikationsdatum: 01.04.2015
Verlag: Springer US
Erschienen in: Calcified Tissue International / Ausgabe 4/2015
Print ISSN: 0171-967X
Elektronische ISSN: 1432-0827
DOI: https://doi.org/10.1007/s00223-015-9962-z

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