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The occurrence of osteoarthritis is closely related to progressive and irreversible destruction of the articular cartilage, which increases the friction significantly and causes further inflammation of the joint. Thus, a scaffold for articular cartilage defects should be developed via lubrication restoration and drug intervention. In this study, we successfully synthesized gelatin-based composite hydrogels, namely GelMA-PAM-PMPC, with the properties of biomimetic lubrication and sustained drug release by photopolymerization of methacrylic anhydride modified gelatin (GelMA), acrylamide (AM), and 2-methacryloyloxyethyl phosphorylcholine (MPC). Tribological test showed that the composite hydrogels remarkably enhanced lubrication due to the hydration lubrication mechanism, where a tenacious hydration shell was formed around the zwitterionic phosphocholine headgroups. In addition, drug release test indicated that the composite hydrogels efficiently encapsulated an anti-inflammatory drug (diclofenac sodium) and achieved sustained release. Furthermore, the in vitro test revealed that the composite hydrogels were biocompatible, and the mRNA expression of both anabolic and catabolic genes of the articular cartilage was suitably regulated. This indicated that the composite hydrogels could effectively protect chondrocytes from inflammatory cytokine-induced degeneration. In summary, the composite hydrogels that provide biomimetic hydration lubrication and sustained local drug release represent a promising scaffold for cartilage defects in the treatment of osteoarthritis.


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Gelatin-based composite hydrogels with biomimetic lubrication and sustained drug release

Show Author's information Kuan ZHANG1,2,Jielai YANG3,4,Yulong SUN1Yi WANG1Jing LIANG4Jing LUO5Wenguo CUI4Lianfu DENG4Xiangyang XU3( )Bo WANG2( )Hongyu ZHANG1( )
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
School of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Department of Orthopedics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint Diseases, Shanghai Institute of Traumatology and Orthopaedics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
Beijing Research Institute of Automation for Machinery Industry Co., Ltd., Beijing 100120, China

Kuan ZHANG and Jielai YANG contributed equally to this work.

Abstract

The occurrence of osteoarthritis is closely related to progressive and irreversible destruction of the articular cartilage, which increases the friction significantly and causes further inflammation of the joint. Thus, a scaffold for articular cartilage defects should be developed via lubrication restoration and drug intervention. In this study, we successfully synthesized gelatin-based composite hydrogels, namely GelMA-PAM-PMPC, with the properties of biomimetic lubrication and sustained drug release by photopolymerization of methacrylic anhydride modified gelatin (GelMA), acrylamide (AM), and 2-methacryloyloxyethyl phosphorylcholine (MPC). Tribological test showed that the composite hydrogels remarkably enhanced lubrication due to the hydration lubrication mechanism, where a tenacious hydration shell was formed around the zwitterionic phosphocholine headgroups. In addition, drug release test indicated that the composite hydrogels efficiently encapsulated an anti-inflammatory drug (diclofenac sodium) and achieved sustained release. Furthermore, the in vitro test revealed that the composite hydrogels were biocompatible, and the mRNA expression of both anabolic and catabolic genes of the articular cartilage was suitably regulated. This indicated that the composite hydrogels could effectively protect chondrocytes from inflammatory cytokine-induced degeneration. In summary, the composite hydrogels that provide biomimetic hydration lubrication and sustained local drug release represent a promising scaffold for cartilage defects in the treatment of osteoarthritis.

Keywords: articular cartilage, hydration lubrication, drug delivery, hydrogel, zwitterionic polymer

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Publication history
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Publication history

Received: 12 June 2020
Revised: 27 July 2020
Accepted: 30 July 2020
Published: 11 January 2021
Issue date: February 2022

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© The author(s) 2020

Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 51675296, 21868011, and 81772372), Shanghai Municipal Science Foundation (No. SYXF011803), Tsinghua University- Peking Union Medical College Hospital Initiative Scientific Research Program (No. 20191080593), the National Key R&D Program of China (No. 2017YFC1103800), Foshan-Tsinghua Innovation Special Fund (FTISF), Research Fund of State Key Laboratory of Tribology, Tsinghua University, China (No. SKLT2020C11), and Ng Teng Fong Charitable Foundation (No. 202-276-132-13).

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