Expression of the Vascular Endothelial Growth Factor and Angiopoietins in Mucoepidermoid Carcinoma of Salivary Gland |
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Authors: | Ana P D Demasi Carolina A B Silva Alessandra D Silva Cristiane Furuse Andresa B Soares Albina Altemani Marcelo H Napimoga Vera C Araújo |
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Affiliation: | 1.Departamento de Patologia Oral, Faculdade de Odontologia e Centro de Pesquisas São Leopoldo Mandic, Rua José Rocha Junqueira, 13, Campinas, SP CEP 13045-755 Brazil ;2.Department of Pathology, State University of Campinas, Campinas, SP Brazil |
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Abstract: | Disrupted coordination of angiogenesis regulating signals, among them the vascular endothelial growth factor (VEGF) and angiopoietins
(Angs), has been associated with abnormal angiogenesis and tumor progression. While VEGF induces endothelial cell proliferation,
thereby initiating vessel formation, Angs are subsequently required for mural cell attachment, thus influencing remodeling
and maturation of this vasculature. In addition to tumor cell, endothelial and mural cells, as well as myofibroblasts may
also contribute to the secretion of these factors. In this study, we have analyzed by immunohistochemistry the expression
of VEGF, Ang-1, Ang-2 and the Angs receptor Tie2 in both the stroma and tumor cells of mucoepidermoid carcinoma (MEC) of salivary
gland. We have demonstrated that when myofibroblasts were detected adjacent to the cancer cells, they were frequently associated
with intense positive staining for Ang-1 and Ang-2, and no reactivity to VEGF and Tie2. These myofibroblast-rich Ang-1 and
Ang-2-stained areas were more commonly found in high-grade MEC cases than in low-grade ones. As for the malignant cells, they
frequently expressed all proteins studied, but Ang-2 and VEGF were detected at higher levels compared to Ang-1 and Tie2. Our
results indicate that the MEC environment favors cooperative activity between Angs and VEGF in modulating vascular growth
and tumor aggressiveness. |
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Keywords: | VEGF Angiopoietins Mucoepidermoid carcinoma Salivary gland Head and neck cancer |
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