Osteogenic differentiation of human umbilical cord-derived mesenchymal stem cells promoted by overexpression of osterix

Huang, Shengyun; Jia, Shanshan; Liu, Guijun; Fang, Dong; Zhang, Dongsheng

doi:10.5372/1905-7415.0706.236

Abstract

Background: Umbilical cord-derived mesenchymal stem cells (UC-MSCs) are considered to be multipotent mesenchymal stem cells that are easily induced to differentiate into functional osteoblasts both in vitro and in vivo. Osterix (Osx), a novel zinc-⃞nger-containing transcription factor of the Sp family, is required for osteoblast differentiation and bone formation.

Objective: We investigated the effect of Osx on the proliferation and osteogenic differentiation of the UC-MSCs.

Method: The primary UC-MSCs were isolated and cultured. An Osx-expressing plasmid (pEGFP-Osx) was constructed and transfected into UC-MSCs. Then expression of bone morphogenesis-related genes, proliferation rate, alkaline phosphatase activity, and mineralization were examined to evaluate the osteogenic potential of the Osx gene-modified UC-MSCs.

Result: UC-MSCs transfected with pEGFP-Osx exhibited apparent osteogenic differentiation as determined by increased activity of alkaline phosphatase, the formation of mineralized nodules and the expression of related osteoblastic genes.

Conclusion: These results confirmed the ability of Osx to enhance osteoblast differentiation of UC-MSCs in vitro, and the Osx gene-modified UC-MSCs are potential as novel cell resources of bone tissue engineering.

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Osteogenic differentiation of human umbilical cord-derived mesenchymal stem cells promoted by overexpression of osterix

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