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Lu, Zhichao Department of Orthopaedic Surgery, Okayama University Graduate School
Furumatsu, Takayuki Department of Orthopaedic Surgery, Okayama University Graduate School
Fujii, Masataka Department of Orthopaedic Surgery, Okayama University Graduate School
Maehara, Ami Department of Orthopaedic Surgery, Okayama University Graduate School
Ozaki, Toshifumi Department of Orthopaedic Surgery, Okayama University Graduate School
Abstract
BACKGROUND: The meniscus plays an important role in controlling the complex biomechanics of the knee. Meniscus injury is common in the knee joint. The perimeniscal capillary plexus supplies the outer meniscus, whereas the inner meniscus is composed of avascular tissue. Angiogenesis factors, such as vascular endothelial growth factor (VEGF), have important roles in promoting vascularization of various tissues. VEGF-mediated neovascularization is beneficial to the healing of injured tissues. However, the distribution and angiogenic role of VEGF remains unclear in the meniscus and injured meniscus. We hypothesized that VEGF could affect meniscus cells and modulate the meniscus healing process. METHODS: Menisci were obtained from total knee arthroplasty patients. Meniscal injury was created ex vivo by a microsurgical blade. VEGF mRNA and protein expression were detected by the polymerase chain reaction and immunohistochemical analyses, respectively. RESULTS: In native meniscal tissue, the expression of VEGF and HIF-1α mRNAs could not be detected. However, VEGF and HIF-1α mRNAs were found in cultured meniscal cells (VEGF: outer > inner; HIF-1α: outer = inner). Injury increased mRNA levels of both VEGF and HIF-1α, with the increase being greatest in the outer area. Immunohistochemical analyses revealed that VEGF protein was detected mainly in the outer region and around injured areas of the meniscus. However, VEGF concentrations were similar between inner and outer menisci-derived media. CONCLUSIONS: This study demonstrated that both the inner and outer regions of the meniscus contained VEGF. HIF-1α expression and VEGF deposition were high in injured meniscal tissue. Our results suggest that injury stimulates the expression of HIF-1α and VEGF that may be preserved in the extracellular matrix as the healing stimulator of damaged meniscus, especially in the outer meniscus.
Keywords
vascular endothelial growth factor (VEGF)
meniscus
meniscal injury
hypoxia-inducible factor-1α (HIF-1α)
Note
This is an Accepted Manuscript of an article published by Elsevier
Published Date
2017-07
Publication Title
Journal of Orthopaedic Science
Volume
volume22
Issue
issue4
Publisher
Elsevier
Start Page
715
End Page
721
ISSN
0949-2658
NCID
AA11052566
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.ja
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isVersionOf https://doi.org/10.1016/j.jos.2017.02.006