TGFβ-1 and Healing of Bone Defects in Large Animal and Rabbit Models: A Systematic Review
Publication: Tissue Engineering Part A
Abstract
Long bone and craniofacial bone fractures amount to an overwhelming expenditure for patients and health care systems each year. Overall, 5–10% of all bone fractures result in some form of delayed or nonunion fractures. Nonunions occur from insufficient mechanical stabilization or a compromised wound environment lacking in vasculature and progenitor cells. The current standard for treating these critical-sized fractures and defects is the use of autologous bone grafts. However, advancements in tissue engineering have cultivated a shift in scientific efforts toward harnessing the body’s own regenerative resources. As such, research on fracture healing has shifted as well. Transforming growth factor-beta 1 (TGFβ-1) has been studied in fracture healing for over 25 years, though many of these studies have been in vitro or in small animal models. The few studies in large animals have disagreement due to the heterogeneity within the experimental design. Because TGFβ-1 plays such a crucial role in the bone healing process, this systematic review investigates the application of TGFβ-1 in various carrier vehicles for repairing bone injuries in large animal and rabbit models. A systematic search was conducted in PubMed, Embase, and Web of Science (from database construction—October 2024). A total of 244 articles were screened, and 24 studies were included for review. Most large animal long bone studies used coated titanium implants, while most rabbit long bone studies used some form of degradable polymer constructs. TGFβ-1 doses in large animal long bone studies range from 0.005 to 750 µg, doses in large animal calvaria and mandible studies range from 1 to 5000 µg, and doses in rabbit long bone studies range from 0.05 to 120 µg. Nineteen out of 24 articles reviewed indicate successful use of TGFβ-1 for bone regeneration compared with experimental controls. It is clear that dose and controlled release of growth factor play a crucial role in defect closure, but outcome measures and success criteria were inconsistent across studies. More studies with consistent experimental designs are critical for understanding the therapeutic potential of TGFβ-1 in fracture repair, but overall, this review indicates that TGFβ-1 can be used alone or in conjunction with other growth factors to accelerate successful bone repair.
Abstract
Impact Statement
Studies using TGFβ-1 to enhance successful long bone fracture and defect repair in large animals are limited, preventing therapeutic advancements from reaching clinical translation. Experimental design has also been heterogeneous, leading to contrasting results and a lack of insight into the potential benefits that TGFβ-1 may offer. This review summarizes much of the in vivo research utilizing TGFβ-1 in both large animal and rabbit long bone repair, as well as in large animal calvaria and mandible repair to capture the most up-to-date perspectives on its advantages and deficiencies. This review can serve as a guideline for future exploration and innovation.
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Information & Authors
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Published In
Tissue Engineering Part A
PubMed: 39723971
Copyright
Copyright 2024, Mary Ann Liebert, Inc., publishers.
History
Published online: 26 December 2024
Accepted: 18 November 2024
Received: 29 July 2024
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Authors’ Contributions
S.T., A.J.A., and J.M.T.: Conceptualization, data analysis, interpretation, and article writing. All authors revised and approved the final report.
Disclosure Statement
No competing financial interests exist.
Funding Information
This work was supported by the National Institute of Health (R01DE030296, F31DE031967-01A1) and the Department of Defense (W81XWH-16–1-0793).
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