Osteoinducing scaffolds with multi-layered biointerface

Biomed Mater. 2018 Jun 6;13(5):054103. doi: 10.1088/1748-605X/aac4cb.

Abstract

This study was aimed to design and characterise hybrid tissue-engineered constructs composed of osteoinducing polylactide-based scaffolds with multi-layered cellular biointerface for bone tissue reconstruction. Three-dimensional scaffolds with improved hydrophilic and osteoinducing properties were produced using the surface-selective laser sintering (SSLS) method. The designed scaffold pattern had dimensions of 8 × 8 × 2.5 mm and ladder-like pores (∼700 μm in width). Hyaluronic acid-coated polylactide microparticles (∼100 μm in diameter) were used as building blocks and water was used as the photosensitizer for SSLS followed by photocross-linking with Irgacure 2959 photoinitiator. Resulting scaffolds provided successful adhesion and expansion of human bone marrow mesenchymal stromal cells from a single-cell suspension. Induced calcium deposition by the cells associated with osteogenic differentiation was detected in 7-21 days of culturing in basal medium. The values were up to 60% higher on scaffolds produced at a higher prototyping speed under the experimental conditions. Innovative approach to graft the scaffolds with multi-layered cell sheets was proposed aiming to facilitate host tissue-implant integration. The sheets of murine MS-5 stromal cell line exhibited contiguous morphology and high viability in a modelled construct. Thus, the SSLS method proved to be effective in designing osteoinducing scaffolds suitable for the delivery of cell sheets.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 3T3 Cells
  • Animals
  • Biocompatible Materials / chemistry*
  • Bone Marrow Cells / cytology
  • Bone Substitutes / chemistry*
  • Calcium / chemistry
  • Cell Differentiation / drug effects
  • Collagen / chemistry
  • Culture Media
  • Fibroblasts / cytology
  • Humans
  • Hyaluronic Acid / chemistry
  • Mesenchymal Stem Cells / cytology
  • Mice
  • Microspheres
  • Osteoblasts / cytology
  • Osteogenesis / drug effects
  • Polyesters / chemistry
  • Signal Transduction
  • Tissue Engineering / methods*
  • Tissue Scaffolds / chemistry*

Substances

  • Biocompatible Materials
  • Bone Substitutes
  • Culture Media
  • Polyesters
  • poly(lactide)
  • Hyaluronic Acid
  • Collagen
  • Calcium