Ectopic bone formation in and soft‐tissue response toP(CL/DLLA)/bioactive glass composite scaffolds

• DOI: 10.1111/clr.12051
• Publication Date: 2012-10-29T19:49:26Z
• Authors: Ville V. Meretoja; Teemu Tirri; Minna Malin; Jukka V. Seppälä; Timo O. Närhi
• Keywords: 0301 basic medicine; Biopsy; Polyesters; 0206 medical engineering; ta220; Biocompatible Materials; 02 engineering and technology; Choristoma; Skin Diseases; Bone and Bones; Rats, Sprague-Dawley; 03 medical and health sciences; 0302 clinical medicine; Materials Testing; Animals; ta216; ta215; ta999; ta313; Tissue Scaffolds; Foreign-Body Reaction; Rats, Inbred F344; Rats; Bone Substitutes; Glass; Porosity

AbstractObjectivesTo characterize biological response to subcutaneously implanted macroporous poly(ε‐caprolactone/D,L‐lactide)‐based scaffolds, and to evaluate the effect of bioactive glass (BAG) filler and osteogenic cells to the tissue response and ectopic bone formation.Material and methodsIn the first part of this study, six different scaffold types were screened in a rat subcutaneous implantation model. The polymer scaffolds with 70/30 caprolactone/lactide ratio and corresponding composites with < 45 μmBAGfiller size were chosen for the further ectopic bone formation assay. The scaffolds were loaded with differentiating bone marrow stromal cells and implanted subcutaneously in syngeneic rats.ResultsWith plain scaffolds, only mild foreign body reaction with no signs of gross inflammation was observed after 4 weeks of implantation. Furthermore, the scaffolds were fully invaded by well‐vascularized soft connective tissue. Overall, all the tested scaffold types showed an appropriate host response. With cell‐seeded scaffolds, several loci of immature mineralizing tissue and small amounts of mature bone were observed after 4 weeks. The incidence of mature bone formation was two and four in polymer scaffolds and composites, respectively (n = 8). After twelve weeks, mature bone was observed in only one polymer scaffold but in seven composites (n = 8). Excluding bone formation, the host response was considered similar to that with cell‐free scaffolds.ConclusionsPlain scaffolds supported the ingrowth of well‐vascularized fibroconnective tissue. Furthermore, cell seeded composites withBAGfiller showed enhanced ectopic bone formation in comparison with corresponding neat polymer scaffolds.