Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/96439
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Type: Journal article
Title: The potential role of VEGF-induced vascularisation in the bony repair of injured growth plate cartilage
Author: Chung, R.
Foster, B.
Xian, C.
Citation: Journal of Endocrinology, 2014; 221(1):63-75
Publisher: Society for Endocrinology
Issue Date: 2014
ISSN: 0022-0795
1479-6805
Statement of
Responsibility: 
Rosa Chung, Bruce K Foster and Cory J Xian
Abstract: Growth plate injuries often result in undesirable bony repair causing bone growth defects, for which the underlying mechanisms are unclear. Whilst the key importance of pro-angiogenic vascular endothelial growth factor (VEGF) is well-known in bone development and fracture repair, its role during growth plate bony repair remains unexplored. Using a rat tibial growth plate injury repair model with anti-VEGF antibody, Bevacizumab, as a single i.p. injection (2.5 mg/kg) after injury, this study examined the roles of VEGF-driven angiogenesis during growth plate bony repair. Histology analyses observed isolectin-B4-positive endothelial cells and blood vessel-like structures within the injury site on days 6 and 14, with anti-VEGF treatment significantly decreasing blood-vessel-like structures within the injury site (P<0.05). Compared with untreated controls, anti-VEGF treatment resulted in an increase in undifferentiated mesenchymal repair tissue, but decreased bony tissue at the injury site at day 14 (P<0.01). Consistently, microcomputed tomography analysis of the injury site showed significantly decreased bony repair tissue after treatment (P<0.01). RT-PCR analyses revealed a significant decrease in osteocalcin (P<0.01) and a decreasing trend in Runx2 expression at the injury site following treatment. Furthermore, growth plate injury-induced reduced tibial lengthening was more pronounced in anti-VEGF-treated injured rats on day 60, consistent with the observation of a significantly increased height of the hypertrophic zone adjacent to the growth plate injury site (P<0.05). These results indicate that VEGF is important for angiogenesis and formation of bony repair tissue at the growth plate injury site as well as for endochondral bone lengthening function of the uninjured growth plate.
Keywords: growth plate injury; VEGF; angiogenesis; bony repair
Rights: © 2014 Society for Endocrinology
RMID: 0030026054
DOI: 10.1530/JOE-13-0539
Appears in Collections:Medicine publications

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