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Cell Cycle-specific Measurement of γH2AX and Apoptosis After Genotoxic Stress by Flow Cytometry
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DUOX1 Silencing in Mammary Cell Alters the Response to Genotoxic Stress

Rodrigo S Fortunato1,2, Luciana R Gomes2, Veridiana Munford2

  • 1Laboratório de Radiobiologia Molecular, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.

Oxidative Medicine and Cellular Longevity
|June 1, 2018
PubMed

Insights

Dual oxidase 1 (DUOX1) is downregulated in breast cancer, promoting cell proliferation and hindering apoptosis. Silencing DUOX1 contributes to breast carcinogenesis, highlighting its tumor suppressor role.

Area of Science:

  • Biochemistry
  • Oncology
  • Cell Biology

Background:

  • Dual oxidase 1 (DUOX1) is an H2O2-generating enzyme implicated in various biological processes.
  • DUOX1 downregulation is observed in lung and liver cancers, suggesting a tumor suppressor function.
  • DUOX1 expression is decreased in breast cancer cell lines and tissues compared to non-tumor counterparts.

Purpose of the Study:

  • To investigate the role of DUOX1 in breast cell biology and its potential involvement in breast carcinogenesis.
  • To determine the functional consequences of DUOX1 silencing in non-tumorigenic mammary cells.

Main Methods:

  • Stable knockdown of DUOX1 expression in MCF12A cells using shRNA.
  • Assessment of cell proliferation, migration, and adhesion properties.
  • Evaluation of IL-6 and IL-8 secretion and apoptosis levels following doxorubicin-induced genotoxic stress.

Main Results:

  • DUOX1 knockdown in MCF12A cells resulted in increased cell proliferation rates.
  • Silencing DUOX1 led to decreased migration and adhesion capabilities.
  • DUOX1-silenced cells exhibited reduced IL-6 and IL-8 secretion and elevated apoptosis after doxorubicin treatment.
  • Increased cell proliferation was observed in DUOX1-silenced cells post-doxorubicin exposure compared to controls.

Conclusions:

  • DUOX1 is silenced in breast cancer, suggesting its role as a tumor suppressor.
  • DUOX1 silencing contributes to key features of transformed cells and promotes breast carcinogenesis.

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