Expression of APC protein during tongue malignant transformation in galectin-3-deficient mice challenged by the carcinogen 4-nitroquniline-n-oxide

Marcus Vinicius Rodrigues de Souza, João Paulo Silva Servato, Adriano Mota Loyola, Sérgio Vitorino Cardoso, Roger Chammas, Fu-Tong Liu, Marcelo José Barbosa Silva, Paulo Rogério de Faria

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Galectin-3 (Gal3) has been implicated in the development of different tumors because of its involvement in the Wnt signaling pathway by promoting beta-catenin translocation into the nucleus. The APC protein, a negative regulator of this pathway, has been strongly implicated in the development of colon cancer, but still has an undetermined role in the formation of oral cancer. Therefore, this study aimed to evaluate the relationship between Gal3, the Wnt signaling pathway, and APC expression in dysplasias and carcinomas developed experimentally in mice. Sixty galectin-3-deficient (Gal3-/-) and 60 wild-type (Gal3+/+) mice were early employed to be treated with the carcinogen 4NQO for 16 weeks and killed at either week 16 or week 32. Tongues were removed, processed and embedded in paraffin blocks. Sections 5 μm thick were made, and then stained by H&E to establish the diagnosis of dysplasia and carcinoma. Sections of 2 μm thickness were made to detect APC expression in these lesions by immunohistochemistry. Oral carcinogenesis occurred in both groups of mice, but no statistical difference was reached. APC expression was exclusively seen in the cytoplasm of all lesions studied. In the intragroup analysis, the majority of dysplasias and carcinomas exhibiting higher APC immunoreactivity was observed in Gal3-/- mice compared to Gal3+/+ mice, but no significant difference was found. However, a statistical difference was only observed between dysplastic lesions from two mice. Our results showed that neither the absence of Gal3 nor the APC protein appears to play a role in malignant transformation of the tongue.

Original languageEnglish (US)
Pages (from-to)3255-3263
Number of pages9
JournalInternational Journal of Clinical and Experimental Pathology
Volume7
Issue number6
StatePublished - 2014

Keywords

  • APC protein
  • Galectin-3
  • Immunohistochemistry
  • Mice
  • Oral carcinogenesis
  • Tongue

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology

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    de Souza, M. V. R., Servato, J. P. S., Loyola, A. M., Cardoso, S. V., Chammas, R., Liu, F-T., Silva, M. J. B., & de Faria, P. R. (2014). Expression of APC protein during tongue malignant transformation in galectin-3-deficient mice challenged by the carcinogen 4-nitroquniline-n-oxide. International Journal of Clinical and Experimental Pathology, 7(6), 3255-3263.