Issue 24, 2020

Magnetic lanthanum-doped hydroxyapatite/chitosan scaffolds with endogenous stem cell-recruiting and immunomodulatory properties for bone regeneration

Abstract

Generally, the addition of exogenous stem cells and host-to-scaffold immune responses restricts the clinical applications of hydroxyapatite (HA)/chitosan (CS) scaffolds for bone regeneration. To achieve “facilitated endogenous tissue engineering”, magnetic M-type hexagonal ferrite (SrFe12O19) nanoparticles were incorporated into bone scaffolds to recruit endogenous stem cells. Then, lanthanum incorporation was utilized to regulate host-to-scaffold immune responses and to provide a pro-regenerative environment for recruited endogenous stem cells. Here, we first fabricated and characterized magnetic lanthanum-doped HA/CS scaffolds. The MLaHA/CS scaffolds were demonstrated to be effective at recruiting rat bone marrow mesenchymal stem cells (rBMSCs) and modulating host-to-scaffold immune responses by promoting macrophage polarization into the anti-inflammatory phenotype (M2) in vitro. By further examining the underlying mechanism, we found that MLaHA/CS scaffolds could promote the osteogenic differentiation of rBMSCs by upregulating the phosphorylation of the Smad 1/5/9 pathway. When MLaHA/CS scaffolds were implanted into rat calvarial defects, the incorporation of magnetic nanoparticles and lanthanum significantly promoted the new bone regeneration, as revealed by micro-CT assays and histological staining. Our findings suggest that MLaHA/CS shows great potential for use as a cell-free and biocompatible scaffold for bone regeneration.

Graphical abstract: Magnetic lanthanum-doped hydroxyapatite/chitosan scaffolds with endogenous stem cell-recruiting and immunomodulatory properties for bone regeneration

Supplementary files

Article information

Article type
Paper
Submitted
07 fev 2020
Accepted
11 mai 2020
First published
22 mai 2020

J. Mater. Chem. B, 2020,8, 5280-5292

Magnetic lanthanum-doped hydroxyapatite/chitosan scaffolds with endogenous stem cell-recruiting and immunomodulatory properties for bone regeneration

Q. Wang, Y. Tang, Q. Ke, W. Yin, C. Zhang, Y. Guo and J. Guan, J. Mater. Chem. B, 2020, 8, 5280 DOI: 10.1039/D0TB00342E

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