Epidermal Growth Factor Potentiates Migration of MDA-MB 231 Breast Cancer Cells by Increasing NaV1.5 Channel Expression.

Abstract:

INTRODUCTION:Breast cancer is one of the leading causes of death worldwide and is the result of dysregulation of various signaling pathways in mammary epithelial cells. The mortality rate in patients suffering from breast cancer is high because the tumor cells have a prominent invasive capacity towards the surrounding tissues. Previous studies carried out in tumor cell models show that voltage-gated ion channels may be important molecular actors that contribute to the migratory and invasive capacity of the tumor cells. METHODS:In this study, by using an experimental strategy that combines cell and molecular biology assays with electrophysiological recording, we sought to determine whether the voltage-dependent sodium channel NaV1.5 regulates the migratory capacity of the human breast cancer cell line MDA-MB 231, when cells are maintained in the presence of epidermal growth factor (EGF), as an inductor of the epithelial-mesenchymal transition. RESULTS:Our data show that EGF stimulates the migratory capacity of MDA-MB 231 cells, by regulating the functional expression of NaV1.5 channels. Consistent with this, the stimulatory actions of the growth factor were prevented by the use of tetrodotoxin, an Na+ channel selective blocker, as well as by resveratrol, an antioxidant that can also affect Na+ channel activity. DISCUSSION:The understanding of molecular mechanisms, such as the EGF pathway in the progression of breast cancer is fundamental for the design of more effective therapeutic strategies for the disease.

journal_name

Oncology

journal_title

Oncology

authors

González-González L,González-Ramírez R,Flores A,Avelino-Cruz JE,Felix R,Monjaraz E

doi

10.1159/000501802

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

373-382

issue

6

eissn

0030-2414

issn

1423-0232

pii

000501802

journal_volume

97

pub_type

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