DUOX1 Silencing in Mammary Cell Alters the Response to Genotoxic Stress

Author(s)

Fortunato, Rodrigo S. ; Gomes, Luciana R. ; Munford, Veridiana ; Pessoa, Carolina Fittipaldi ; Quinet, Annabel ; Hecht, Fabio ; Kajitani, Gustavo S. ; Milito, Cristiane Bedran ; Carvalho, Denise P. ; Martins Menck, Carlos Frederico

• Document type: Journal article
• Source: OXIDATIVE MEDICINE AND CELLULAR LONGEVITY; v. 2018, p. 9-pg., 2018-01-01.

Abstract

DUOX1 is an H2O2-generating enzyme related to a wide range of biological features, such as hormone synthesis, host defense, cellular proliferation, and fertilization. DUOX1 is frequently downregulated in lung and liver cancers, suggesting a tumor suppressor role for this enzyme. Here, we show that DUOX1 expression is decreased in breast cancer cell lines and also in breast cancers when compared to the nontumor counterpart. In order to address the role of DUOX1 in breast cells, we stably knocked down the expression of DUOX1 in nontumor mammary cells (MCF12A) with shRNA. This led to higher cell proliferation rates and decreased migration and adhesion properties, which are typical features for transformed cells. After genotoxic stress induced by doxorubicin, DUOX1-silenced cells showed reduced IL-6 and IL-8 secretion and increased apoptosis levels. Furthermore, the cell proliferation rate was higher in DUOX1-silenced cells after doxorubicin medication in comparison to control cells. In conclusion, we demonstrate here that DUOX1 is silenced in breast cancer, which seems to be involved in breast carcinogenesis. (AU)

• FAPESP's process: 13/21075-9 - Participation of NADPH oxidase 2 induced by estrogen in the formation of DNA damage and autophagy regulation in breast cells
• Grantee: Carlos Frederico Martins Menck
• Support Opportunities: Research Grants - Visiting Researcher Grant - Brazil
• FAPESP's process: 14/15982-6 - Consequences of repair deficiencies in damaged genome
• Grantee: Carlos Frederico Martins Menck
• Support Opportunities: Research Projects - Thematic Grants