Heparanase and vascular endothelial growth factor expression in the progression of oral mucosal melanoma

Rivera, R.S. and Nagatsuka, H. and Siar, C.H. and Gunduz, M. and Tsujigiwa, H. and Han, P.P. and Katase, N. and Tamamura, R. and Ng, K.H. and Naomoto, Y. and Nakajima, M. and Nagai, N. (2008) Heparanase and vascular endothelial growth factor expression in the progression of oral mucosal melanoma. Oncology Reports, 19 (3). pp. 657-661. ISSN 1021-335X,

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Abstract

Oral mucosal melanoma is an aggressive neoplasm with poor prognosis. Heparanase is an endo-beta-d-glucuronidase, which cleaves heparan sulphate chains. The vascular endothelial growth factor (VEGF) is the most potent angiogenic mitogen and interaction with its receptor (VEGFR) has been associated with angiogenesis. We investigated the expression of these molecules in the progression of oral mucosal melanoma. Immunohistochemistry was carried out in 15 oral melanotic macules and 19 oral melanomas using heparanase, VEGF, VEGFR-2, CD34 and Ki-67. Microvessel density was determined and subjected to statistical analysis. Heparanase and VEGFR-2 were not expressed in the oral melanotic macule. Atypical melanocytes and melanoma cells expressed heparanase, VEGF and VEGFR-2. An intense expression was noted in the early invasive phase, which marks the crucial transition from in situ to the invasive phase. In the invasive component, heparanase was intense but selective in the invasive fronts and at the periphery of nests unlike the extensive expression of VEGF and VEGFR-2. However, hot spots were only observed at the periphery of the nests. In conclusion, melanoma cells expressed heparanase, VEGF and VEGFR-2. The coexpression of these molecules in atypical melanocytes and melanoma cells suggests their function in cell migration and invasion. Moreover, the intense expression in the crucial transition from in situ to the invasive phase suggests their role in the progression of the tumor. The role of VEGF and VEGFR-2 in angiogenesis was evident only at the periphery of the nests in the invasive components.

Item Type: Article
Funders: UNSPECIFIED
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Uncontrolled Keywords: Oral mucosal melanoma heparanase vascular endothelial growth factor vascular endothelial growth factor-receptor microvessel density breast-cancer angiogenesis metastasis activation receptors patterns survival cells vegf
Subjects: R Medicine > RK Dentistry
Divisions: Faculty of Dentistry > Dept of Oral Pathology & Oral Medicine & Periodontology
Depositing User: Ms Nursyafiqah Abd Malek
Date Deposited: 10 Jan 2013 00:15
Last Modified: 10 Jan 2013 00:15
URI: http://eprints.um.edu.my/id/eprint/4311

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