Chinese Journal of Clinical Anatomy ›› 2022, Vol. 40 ›› Issue (6): 696-703.doi: 10.13418/j.issn.1001-165x.2022.6.12

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Application of silk fibroin / chitosan scaffold combined with total flavonoids of Drynaria fortunei on  repair of articular cartilage injury

Yu Yang, Song Yongcai, Yang Lifeng   

  1. Department of Orthopedic Trauma and Joint Surgery, Hanzhong 3201 Hospital, Hanzhong 723000, Shaanxi Province, China
  • Received:2021-05-18 Online:2022-11-25 Published:2022-12-12

Abstract: Objective   To observe the repair effect of cartilage injury, Drynaria total flavonoids was applied to the cartilage injury site by using silk fibroin/chitosan scaffold as the carrier, and provide experimental data for clinical application.    Methods    Silk fibroin / chitosan scaffolds, Drynaria total flavonoids sustained-release microspheres and silk fibroin / chitosan scaffolds loaded with Drynaria total flavonoids sustained-release microspheres were prepared. The microstructure of scaffolds was observed under scanning electron microscope, and the in vitro sustained-release ability of silk fibroin / chitosan scaffolds loaded with Drynaria total flavonoids sustained-release microspheres was detected. Twenty-four New Zealand white rabbits were randomly divided into three groups. A cartilage injury model with a diameter of 3.5 mm and a depth of 1.5 mm was established in the trochlear region of femur by electric drill. In the blank group, no material was implanted in the cartilage defect. In the control group, a simple Silk Fibroin / chitosan scaffold was implanted. In the experimental group, a silk fibroin / chitosan scaffold loaded with osteoclast total flavonoids sustained-release microspheres was implanted. At 12 and 24 weeks after operation, gross and histological observations were performed. The mRNA expressions of Sox-9, type II collagen and aggrecan were detected by RT-PCR, and the expression of type II collagen was detected by Western blot. Results    Silk fibroin / chitosan scaffolds had good three-dimensional pore structure, and the pores connected with each other. The surface of the microspheres was smooth. The drug loaded microspheres were evenly dispersed in the silk fibroin / chitosan scaffold matrix. Silk fibroin / chitosan scaffolds could release Drynaria flavonoids in vitro. The results of gross and histological observation showed that the cartilage injury repair effect of the experimental group was better than that of the control group, and the corresponding ICRs score and Wakitani histological score were higher than those of the control group (P<0.05). The expressions of Sox-9, collagen II and collagen aggregation in the experimental group were higher than those in the control group (P<0.05), and the expression of collagen II was higher than that in the control group (P<0.05).  Conclusions   The silk fibroin / chitosan scaffold loaded with total flavonoids of osteoclast can release the total flavonoids of osteoclast slowly and continuously after being implanted into the damaged part of cartilage, which provides suitable microenvironment for the growth and differentiation of seed cells and effectively promotes the regeneration of cartilage tissue.

Key words: Silk fibroin / chitosan scaffold; ,  , Articular cartilage tissue; ,  , Damage repair

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