A biodegradable, mechanically tunable micro‐arc oxidation AZ91D‐based composite implant with calcium phosphate/chitosan coating promotes long‐term bone tissue regeneration. Issue 10 (16th August 2021)

• Record Type: Journal Article
• Authors: Liu, Tingjiao; Li, Yang; Zhang, Ying; Zhao, Meng; Wen, Zhaohui; Zhang, Liming
• Is Part Of: Biotechnology journal. Volume 16:Issue 10(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-08-16
• Subjects: biocompatibility -- bone regeneration -- calcium phosphate -- magnesium alloy -- Wnt/β‐catenin pathway; Biotechnology -- Periodicals; 660.605
• DOI: 10.1002/biot.202000653
• Languages: English
• ISSNs: 1860-6768

Abstract

Abstract: Background: To reduce the biodegradable rate and develop the long‐term osteogenic ability of magnesium (Mg) alloy, we prepared a new biodegradable micro arc oxidation AZ91D‐based composite implant with calcium phosphate/chitosan coating (CaP‐CS/MAO/AZ91D) and investigated its mechanical property and long‐term bone tissue regeneration ability. Main Methods and Major Results: The results showed that the binding force and bioactivity of CaP‐CS/MAO/AZ91D was better when the ratio of water to ethanol was 4:6 and MAO constant current was 0.1 A cm −2 . Compressive strengths of 4:6 sample were more than 1300 N when the soaking time was increased to 21 days. CaP‐CS/MAO/AZ91D extracts promoted differentiation and proliferation of rat mesenchymal stem cells (RMSC), which achieved higher proliferation rates over 16 days of culture and exhibited early alkaline phosphatase activity and late bone sialoprotein markers. Conclusions and Implications: CaP‐CS/MAO/AZ91D was established to promote RMSC osteogenic differentiation within a proper range for at least 90 days through Wnt/β‐catenin pathway activation, which would allow sufficient time for bone healing. Collectively, our findings suggest that the CaP‐CS/MAO/AZ91D coating could not only reduce the corrosion rate and lead to better long‐term biocompatibility but also promote osteogenic mineralization. Graphical Abstract and Lay Summary: In order to decrease the biodegradable rate, and improve the long‐term biocompatibility and osteogenic ability of magnesium (Mg) alloy, a new biodegradable composite, micro arc oxidation (MAO) AZ91D‐based calcium phosphate/chitosan coating (CaP‐CS/MAO/AZ91D) was investigated. This study showed that the coating of CaP‐CS/MAO/AZ91D could not only reduce the corrosion rate and lead to better long‐term biocompatibility, but also promote osteogenic mineralization.