CGF-HLC-I repaired the bone defect repair of the rabbits mandible through tight junction pathway

Yalin Mao; Miaoling Hu; Li Chen; Xiao Chen; Maohua Liu; Menglian Zhang; Minhai Nie; Xuqian Liu

doi:10.3389/fbioe.2022.976499

CGF-HLC-I repaired the bone defect repair of the rabbits mandible through tight junction pathway

Front Bioeng Biotechnol. 2022 Sep 20:10:976499. doi: 10.3389/fbioe.2022.976499. eCollection 2022.

Authors

Yalin Mao^{1

2}, Miaoling Hu^{1

2}, Li Chen^{1

2}, Xiao Chen^{3

4}, Maohua Liu^{1

2}, Menglian Zhang^{1

2}, Minhai Nie^{1

2}, Xuqian Liu^{1

2}

Affiliations

¹ Department of Periodontics and Oral Mucosal Diseases, The Affiliated Stomatological Hospital of Southwest Medical University, Luzhou, Sichuan, China.
² Luzhou Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration, Southwest Medical University, Luzhou, China.
³ Department of Stomatology Technology, School of Medical Technology, Sichuan College of Traditional Medcine, Mianyang, China.
⁴ Department of Orthodontics, Mianyang Stomatological Hospital, Mianyang, China.

Abstract

Background: The human-like collagen I (HLC-I) combined concentrated growth factors was used to construct CGF-HLC-I composite biomaterials to repair the critical bone defect disease model of rabbit mandible. This study aimed to research the repair mechanism of CGF-HLC-I/Bio-Oss in rabbit mandibular critical bone defect, to provide a new treatment direction for clinical bone defect repair. Methods: The optimal concentration of HLC-I (0.75%) was selected in this study. Nine New Zealand white rabbits were randomly divided into 3 groups, normal control group, Bio-Gide/Bio-Oss and CGF-0.75%HLC-I/Bio-Oss group (n = 3, each group). CGF-0.75%HLC-I/Bio-Oss and Bio-Gide/Bio-Oss were implanted into rabbit mandibles, then X-ray, Micro-CT, HE and Masson staining, immunohistochemical staining and biomechanical testing were performed with the bone continuity or maturity at 4, 8 and 12 weeks after surgery. The repair mechanism was studied by bioinformatics experiments. Results: As the material degraded, the rate of new bone formation in the CGF-0.75% HLC-I/Bio-Oss group was better than that the control group by micro-CT. The biomechanical test showed that the compressive strength and elastic modulus of the CGF-0.75%HLC-I/Bio-Oss group were higher than those of the control group. HE and Masson staining showed that the bone continuity or maturity of the CGF-0.75%HLC-I/Bio-Oss group was better than that of the control group. Immunohistochemical staining showed significantly higher bone morphogenetic protein 2 (BMP2) and Runt-related transcription factor 2 (RUNX2) in the CGF-0.75%HLC-I/Bio-Oss group than the control group at 8 and 12 W and the difference gradually decreased with time. There were 131 differentially expressed proteins (DEPs) in the Bio-Gide/Bio-Oss and CGF-0.75%HLC-I/Bio-Oss groups, containing 95 up-regulated proteins and 36 down-regulated proteins. KEGG database enrichment analysis showed actinin alpha 1 (ACTN1) and myosin heavy-Chain 9 (MYH9) are the main potential differential proteins related to osteogenesis, and they are enriched in the TJs pathway. Conclusion: CGF-0.75%HLC-I/Bio-Oss materials are good biomaterials for bone regeneration which have strong osteoinductive activity. CGF-0.75%HLC-I/Bio-Oss materials can promote new bone formation, providing new ideas for the application of bone tissue engineering scaffold materials in oral clinics.

Keywords: BMP2; CGF-HLC-I/bio-oss; RUNX2; bio-gide/bio-oss; concentrated growth factors; human-like collagen I.