Effect of Collagen-I Modified Composites on Proliferation and Differentiation of Human Alveolar Osteoblasts

Yefang Zhou; Dietmar W. Hutmacher; Sae-Lim Varawan; Tit Meng Lim

doi:10.1071/CH06165

RESEARCH ARTICLE

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Effect of Collagen-I Modified Composites on Proliferation and Differentiation of Human Alveolar Osteoblasts

Yefang Zhou ^A , Dietmar W. Hutmacher ^B ^C ^E , Sae-Lim Varawan ^D and Tit Meng Lim ^A

+ Author Affiliations

- Author Affiliations

^A Department of Biological Sciences, National University of Singapore, Singapore.

^B Tissue Engineering Laboratory, Division of Bioengineering, National University of Singapore, Singapore.

^C Department of Orthopaedic Surgery, National University of Singapore, Singapore.

^D Department of Restorative Dentistry, National University of Singapore, Singapore.

^E Corresponding author. Email: biedwh@nus.edu.sg

Australian Journal of Chemistry 59(8) 571-578 https://doi.org/10.1071/CH06165
Submitted: 9 May 2006 Accepted: 14 July 2006 Published: 8 September 2006

Abstract

Collagen modification of scaffolds has been reported to promote matrix mineralization as an effective way to increase osseointegration of implants. The aim of this study was to investigate in vitro proliferation and differentiation of human alveolar osteoblasts (AOs) on medical-grade polycaprolactone–tricalcium phosphate (mPCL-TCP 80:20) scaffolds after collagen modification (mPCL-TCP-c) for 28 days. Collagen modification significantly increased the scaffold’s protein adsorption ability, and improved the initial seeding efficiency and cell attachment at day 1, compared with non-collagen-modified scaffolds. However, the total DNA content of both groups reached similar levels with no significant difference at 28 days’ culture. AOs were observed to spread along the collagen fibres and form extensive collagenous fibres with mineral nodules embedded, while multilayered cell sheets were formed in mPCL-TCP scaffolds. During culture, alkaline phosphatase (ALP) activity increased three- to five-fold in both groups, and collagen modification did not significantly affect either the metabolic rate or ALP activity kinetics of AOs. During osteogenic differentiation, similar gene expression of collagen type-I, osterix, osteopontin, and osteocalcin were detected in both groups. The mPCL-TCP group showed better organized mineralized tissue, but the mPCL-TCP-c showed more scattered and unorganized tissue. These results indicate that collagen modification improved the scaffold’s protein adsorption ability and encouraged initial cell attachment and distribution, but promoted fibrous-like tissue formation rather than mineralized tissue.

Acknowledgments

This study was supported by a Faculty Research Grant from the Faculty of Dentistry, and a Young Investigator Award from the Office of Life Sciences, National University of Singapore.

References

Effect of Collagen-I Modified Composites on Proliferation and Differentiation of Human Alveolar Osteoblasts

Abstract

Acknowledgments

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