Mechanical properties and osteogenic potential of hydroxyapatite-PLGA-collagen biomaterial for bone regeneration

Didarul B. Bhuiyan, John C. Middleton, Rina Tannenbaum, Timothy M. Wick

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A bone graft is a complicated structure that provides mechanical support and biological signals that regulate bone growth, reconstruction, and repair. A single-component material is inadequate to provide a suitable combination of structural support and biological stimuli to promote bone regeneration. Multicomponent composite biomaterials lack adequate bonding among the components to prevent phase separation after implantation. We have previously developed a novel multistep polymerization and fabrication process to construct a nano-hydroxyapatite-poly(D,L-lactide-co-glycolide)-collagen biomaterial (abbreviated nHAP-PLGA-collagen) with the components covalently bonded to each other. In the present study, the mechanical properties and osteogenic potential of nHAP-PLGA-collagen are characterized to assess the material’s suitability to support bone regeneration. nHAP-PLGA-collagen films exhibit tensile strength very close to that of human cancellous bone. Human mesenchymal stem cells (hMSCs) are viable on 2D nHAP-PLGA-collagen films with a sevenfold increase in cell population after 7days of culture. Over 5 weeks of culture, hMSCs deposit matrix and mineral consistent with osteogenic differentiation and bone formation. As a result of matrix deposition, nHAP-PLGA-collagen films cultured with hMSCs exhibit 48% higher tensile strength and fivefold higher moduli compared to nHAP-PLGA-collagen films without cells. More interestingly, secretion of matrix and minerals by differentiated hMSCs cultured on the nHAP-PLGA-collagen films for 5weeks mitigates the loss of mechanical strength that accompanies PLGA hydrolysis.

Original languageEnglish (US)
Pages (from-to)1139-1154
Number of pages16
JournalJournal of Biomaterials Science, Polymer Edition
Volume27
Issue number11
DOIs
StatePublished - Jul 23 2016

Keywords

  • Bone tissue engineering
  • PLGA
  • collagen
  • hydroxyapatite
  • mechanical properties

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