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31 May 2019 : Laboratory Research  

Lithium Chloride-Releasing 3D Printed Scaffold for Enhanced Cartilage Regeneration

Jiayi Li12CEFG, Qingqiang Yao123AEG, Yan Xu12BCG, Huikang Zhang2BCD, Liang-liang Li12BCF, Liming Wang14AG*

DOI: 10.12659/MSM.916918

Med Sci Monit 2019; 25:4041-4050

Abstract

BACKGROUND: We synthetized a 3D printed poly-ε-caprolactone (PCL) scaffold with polydopamine (PDA) coating and lithium chloride (LiCl) deposition for cartilage tissue engineering and analyzed its effect on promoting rabbit bone marrow mesenchymal stem cells (rBMSC) chondrogenesis in vitro.

MATERIAL AND METHODS: PCL scaffolds were prepared by 3D printing with a well-designed CAD digital model, then modified by PDA coating to produce PCL-PDA scaffolds. Finally, LiCl was deposited on the PDA coating to produce PCL-PDA-Li scaffolds. The physicochemical properties, bioactivity, and biocompatibility of PCL-PDA-Li scaffolds were accessed by comparing them with PCL scaffolds and PCL-PDA scaffolds.

RESULTS: 3D PCL scaffolds exhibited excellent mechanical integrity as designed. PDA coating and LiCl deposition improved surface hydrophilicity without sacrificing mechanical strength. Li⁺ release was durable and ion concentration did not reach the cytotoxicity level. This in vitro study showed that, compared to PCL scaffolds, PCL-PDA and PCL-PDA-Li scaffolds significantly increased glycosaminoglycan (GAG) formation and chondrogenic marker gene expression, while PCL-PDA-Li scaffolds showed far higher rBMSC viability and chondrogenesis.

CONCLUSIONS: 3D printed PCL-PDA-Li scaffolds promoted chondrogenesis in vitro and may provide a good method for lithium administration and be a potential candidate for cartilage tissue engineering.

Keywords: Cartilage, Lithium Chloride, Printing, Tissue Scaffolds, Biocompatible Materials, Bone Marrow, Caproates, Chondrogenesis, Indoles, Lactones, Mesenchymal Stem Cells, Osteogenesis, Polyesters, Polymers, Printing, Three-Dimensional, Regeneration, Tissue Engineering

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750