Guozhu Y, yihua W, Zhu Y, li D, Tianqi Z, Jia L, Shizhou Z. Adenovirus mediated gene delivery of α-calcitonin gene-related peptide facilitates osseointegration of implant in ovariectomized rat.
Regen Ther 2025;
29:140-147. [PMID:
40162020 PMCID:
PMC11952862 DOI:
10.1016/j.reth.2025.02.016]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2024] [Revised: 02/12/2025] [Accepted: 02/27/2025] [Indexed: 04/02/2025] Open
Abstract
Background
Osteoporosis, which adversely affected osseointegration of dental implants, became prevalent with the entry of ageing era. Recent studies indicated that α-calcitonin gene-related peptide (α-CGRP) played a role in modulating osteoporosis. However, due to the plasma half-life of α-CGRP being estimated at merely 7-10 min, it was difficult to utilize a conventional method that administered sufficient α-CGRP to the implant site. This present study aimed to investigate the efficacy of an α-CGRP transgene in promoting implant osseointegration in ovariectomized (OVX) rats.
Method
The osteoporosis rat model was established through bilateral ovariectomy, following which the subjects were categorized into three distinct groups: the α-CGRP transgene group, the empty virus vector group, and the blank control group. Ad-CGRP-EGFP was locally administered into the bone defect site prior to implant placement in the OVX rats. 7 and 28 days after implantation, the femurs were isolated for molecular and histological analyses, micro-CT analysis and biomechanical test.
Result
Bone marrow stromal cells (BMSCs) transduced with Ad-CGRP-EGFP could continuously express α-CGRP more than 28 days in vitro. Successful transgene expression was confirmed through cryosectioning and Western blot analysis 7 days after implantation in vivo. The results indicated a substantial decrease in the quantity of TRAP + cells in the α-CGRP transgene group. Additionally, quantitative real-time RT-PCR and Western blot analysis revealed a significant elevation in the expression levels of Runx2 and ALP, coupled with a notable reduction in the expression of cathepsin K and RANKL (P<0.05). Moreover, the α-CGRP transgene group exhibited a significant enhancement in osteointegration and restoration of implant stability in OVX rats (P<0.01) 28 days after implantation.
Conclusion
This study implied a great therapeutic potential of α-CGRP in osseointegration of titanium implants in OVX-relative osteoporosis rats, offering valuable insights for guiding bone regeneration strategies under osteoporotic conditions.
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