Extracellular matrix protein mediated regulation of the osteoblast differentiation of bone marrow derived human mesenchymal stem cells.

Mathews, Smitha and Bhonde, Ramesh and Gupta, PawanKumar and Totey, Satish (2012) Extracellular matrix protein mediated regulation of the osteoblast differentiation of bone marrow derived human mesenchymal stem cells. Differentiation, 84 (2). pp. 185-192. ISSN 1432-0436.

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The biomimetic approach of tissue engineering exploits the favorable properties of the extracellular matrix (ECM), to achieve better scaffold performance and tissue regeneration. ECM proteins regulate cell adhesion and differentiation through integrin mediated signal transduction. In the present study, we have examined the role of ECM proteins such as collagen type I, fibronectin, laminin and vitronectin in regulating the proliferation and osteogenic differentiation of bone marrow derived human mesenchymal stem cells (hMSCs). hMSCs were grown on selected ECM protein treated tissue culture plates. The growth kinetics was assessed by calculating the doubling time of the cells on different ECM treated plates. The cells were directed to osteoblast lineage by growing them in osteogenic induction media for 21 day. Differentiation was evaluated at different time points by osteoblast differentiation associated gene expression, alkaline phosphatase (ALP) activity, histochemical staining for mineralized matrix and calcium quantification. The doubling time of hMSCs cultured on collagen type I was significantly low, which was followed by laminin and fibronectin treated plates. However, doubling time of hMSCs cultured on vitronectin treated plate was not significantly different than that of the untreated control. High ALP gene (ALPL) expression and associated enhancement of mineralization were observed on collagen type I, fibronectin and vitronectin treated plates. Collagen type I showed early onset of mineralization with high ALP activity and up-regulation of osteopontin, ALPL, bone sialoprotein and osteocalcin genes. Vitronectin also up-regulated these genes and showed the highest amount of calcium in the secreted mineral matrix. Therefore, we conclude that, ECM proteins indeed modified the growth patterns and induced the osteoblast differentiation of hMSCs. Our findings have significant implication for bone tissue engineering applications.

Item Type: Article
Additional Information: Copy right of this article is belongs to John Wiley and Sons.
Uncontrolled Keywords: Mesenchymal stemcells;Extracellular matrix; Osteoblast;differentiation;Alkaline phosphatase;Collagen; Vitronectin.
Subjects: Regenerative Medicine > MIRM Bangalore
Depositing User: MCON Library
Date Deposited: 13 Apr 2013 09:23
Last Modified: 13 Apr 2013 09:23
URI: http://eprints.manipal.edu/id/eprint/79652

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