Journal
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 70, Issue -, Pages 1000-1010Publisher
ELSEVIER
DOI: 10.1016/j.msec.2016.06.097
Keywords
Calcium phosphate ceramics; Osteoinduction; Phase composition; BMP2
Categories
Funding
- National Natural Science Foundation of China [81190131, 31500774]
- Provincial Key Technology Support Program of Sichuan, China [2015SZ0027]
- Sichuan University talent recruitment program start-up funding [YJ201413-2082204174101]
Ask authors/readers for more resources
Phase composition played a key role in the biodegradation of calcium phosphate ceramics (CaP), which in turn influences the osteoinductive ability. The in vivo biological mechanism is still poorly understood. In this study, four types of porous CaP ceramics were investigated, namely, hydroxyapatite (HA), beta-tricalcium phosphate (TCP), and biphasic calcium phosphates BCP1 and BCP2, with HA to beta-TCP ratios of 70/30 and 30/70, respectively. The four types of ceramics were implanted into thigh muscle of mice for 16 weeks. Longitudinal ectopic bone formation process at gene, protein, and tissue level induced by the material was assessed. Histological analysis revealed that BCP2 was the only group that had promoted new bone formation after 16 weeks. In micro-CT analysis of biodegradation, the BCP2 group had the least increment of porosity due to the new bone formation, resulting in a significant elevation in material density. Instead of a steady increase, multiple peaks were observed in most of the temporal gene expression patterns. The gene expression results were further confirmed by immunohistochemical staining of the corresponding proteins. Among the target genes, Osterix and type I collagen were activated successively. The osteoinductive BCP2 group showed earlier and significantly higher peaks in BMP2, BMPRIA, and OPG expressions than non-bone forming groups. These findings revealed that the occurrence time and magnitude of these osteogenetic gene expression peaks can be crucial in the osteoinduction process. (C) 2016 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available