Evaluation of cross-linked chitosan microparticles for bone regeneration.

Abstract:

:The objective of this preliminary study was to evaluate the applying of chitosan (CS)-based microparticles (MPs) in bone regeneration in vivo. The CS MPs were fabricated using our scale-up method, as previously described. Mesenchymal stem cells (MSC) were harvested from the femora and tibiae of Dark Agouti (DA) rats and seeded on CS MPs. An in vitro MSCs attachment experiment was conducted by trypsinizing the cells attached to the MPs at 5, 10, 20 and 30 h. Fluorescence images of MSCs attached to the MPs were taken at 24 and 48 h, using a LIVE/DEAD cell assay. The MSC/osteoblasts (OB) seeded on MPs were then cultured in vitro using osteogenic media and implanted into partial thickness bone defects in rat femurs. There were two groups of rats, including experimental animals and controls, for the in vivo studies. The experimental group were implanted with MSC-seeded MPs and observed at 4 and 8 weeks. The control group of rats did not receive any implant material except the stainless steel plate to support the defect. Four rats per group were used for the study. The femurs were extracted at 4 and 8 weeks post-implantation and bone formation at the defect site was analysed using radiography, microcomputed tomography (µCT) and histology. Among all groups, a significant increase in bone formation was observed in the experimental group at 8 weeks implantation. The results of this study suggested that CS MPs prove to be a successful biomaterial for bone regeneration.

journal_name

J Tissue Eng Regen Med

authors

Bhat A,Dreifke MB,Kandimalla Y,Gomez C,Ebraheim NA,Jayasuriya AC

doi

10.1002/term.270

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

532-42

issue

7

eissn

1932-6254

issn

1932-7005

journal_volume

4

pub_type

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