Breast Cancer Cell Lines, HER2/Neu Phenotype, and a Higher Propensity to Reactive Oxygen Species Production

Main Article Content

Zahra Mohammadi Abgarmi
Abbas Sahebghadam Lotfi
Saeid Abroun
Masoud Soleimani
Shahla Mohammad Ganji https://orcid.org/0000-0003-2032-8209
Parvaneh Baktash
Arash Moradi https://orcid.org/0000-0002-1038-084X

Keywords

Breast cancer cell lines, HER2/neu, Oxidative stress

Abstract

Background: The reactive oxygen species (ROS) generated in the biological systems play an important role in pathological conditions and specific normal cellular processes, such as signaling pathways and drug sensitivity.
Methods: Intracellular ROS was determined using (2'-7'dichlorofluorescin diacetate) DCFH-DA fluorimetric probe, malondialdehyde as lipid peroxidation index detected by the Thiobarbituric acid reactive substances method. Cells' protein carbonyl contents were assessed with 2,4-Dinitrophenylhydrazine (DNPH) derivatization spectrophotometrically at 360-385 nm.
Results: The oxidative stress induces ROS (p?0.05), MDA (Malondialdehyde) (p?0.05), and protein carbonylation (p?0.01) was significantly higher in HER2-positive BT-474, SK-BR-3, and MDA-MB-453 compared to the HER2-negative MDA-MB-231 and MCF-7 cell lines.
Conclusion: We hypothesized that increased oxidative stress in HER2-positive cell lines is due to the oncogenic function of the HER2 and PI3K/Akt signaling activation, resulting in glycolysis induction. It is assumed that HER2-positive cell lines with high ROS levels are more vulnerable to further damage by increased ROS levels induced by pro-oxidant anticancer agents.

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