Disc large 1 expression is altered by human papillomavirus E6/E7 proteins in organotypic cultures of human keratinocytes

Author(s)

Bugnon Valdano, M. ; Cavatorta, A. L. ; Morale, M. G. ; Marziali, F. ; de Souza Lino, V. ; Steenbergen, R. D. M. ; Boccardo, E. ; Gardiol, D.

• Document type: Journal article
• Source: JOURNAL OF GENERAL VIROLOGY; v. 97, p. 10-pg., 2016-02-01.

Abstract

Loss of cell polarity is a fundamental process in cell transformation. Among polarity proteins, we focused on human disc large (DLG1), which is localized mainly at adherens junctions and contributes to the control of cell proliferation. We previously demonstrated that its expression is altered in HPV-associated cervical neoplastic lesions, but the mechanisms beyond this remain unknown. In this study, we analysed the contribution of HPV proteins to the changes in DLG1 expression in the squamous epithelium. We observed tissue and intracellular misdistribution of DLG1 when high-risk HPV-18 E7 or E6/E7 proteins were expressed in organotypic raft cultures. The viral oncoproteins induce the loss of DLG1 from the cell borders and an increase in the level of DLG1 protein, reflecting the pattern observed in cervical lesions. These findings were corroborated in cultures bearing the entire HPV-18 genome. Interestingly, changes in tissue distribution and abundance of DLG1 were also detected in organotypic cultures expressing the low-risk HPV-11 E7 or E6/E7 proteins, suggesting a conserved function among different HPV types. However, for low-risk HPVs, the subcellular localization of DLG1 at cell-to-cell contacts was predominantly maintained. This report offers new evidence, we believe, of the involvement of HPV proteins in DLG1 expression pattern and our data support previous observations regarding DLG1 expression in cervical lesions. (AU)

• FAPESP's process: 11/14416-9 - Study of E6 and E7 proteins from HPV16 and HPV6 and its effects on Toll like receptors signaling pathways
• Grantee: Mirian Galliote Morale
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 12/51017-8 - Analysis of polarity proteins expression in neoplastic processes associated with human Papillomavirus using organotypic cultures.
• Grantee: Enrique Mario Boccardo Pierulivo
• Support Opportunities: Regular Research Grants