Modulation of VEGF expression and oxidative stress response by iodine deficiency in irradiated cancerous and non-cancerous breast cells

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  • UCL - Université catholique de Louvain

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Abstract

Breast cancer remains a major concern and its physiopathology is influenced by iodine deficiency (ID) and radiation exposure. Since radiation and ID can separately induce oxidative stress (OS) and microvascular responses in breast, their combination could additively increase these responses. Therefore, ID was induced in MCF7 and MCF12A breast cell lines by medium change. Cells were then X-irradiated with doses of 0.05, 0.1, or 3 Gy. In MCF12A cells, both ID and radiation (0.1 and 3 Gy) increased OS and vascular endothelial growth factor (VEGF) expression, with an additive effect when the highest dose was combined with ID. However, in MCF7 cells no additive effect was observed. VEGF mRNA up-regulation was reactive oxygen species (ROS)-dependent, involving radiation-induced mitochondrial ROS. Results on total VEGF mRNA hold true for the pro-angiogenic isoform VEGF165 mRNA, but the treatments did not modulate the anti-angiogenic isoform VEGF165b. Radiation-induced antioxidant response was differentially regulated upon ID in both cell lines. Thus, radiation response is modulated according to iodine status and cell type and can lead to additive effects on ROS and VEGF. As these are often involved in cancer initiation and progression, we believe that iodine status should be taken into account in radiation prevention policies

Details

Original languageEnglish
Article number3963
Pages (from-to)1-18
Number of pages18
JournalInternational Journal of Molecular Sciences
Volume21
Issue number3963
DOIs
Publication statusPublished - 31 May 2020

Keywords

  • Radiation, Iodine deficiency, Breast, VEGF, ROS, Oxidative stress, MCF12A, MCF7

ID: 6824218