Journal
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
Volume 1616, Issue 2, Pages 107-111Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbamem.2003.07.001
Keywords
ionic channel; invasion; cancer cell line; MDA-MB-231; MCF-7; MDA-MB-468
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This work reports the finding of a unique fast inward sodium current (I-Na) in MDA-MB-231 cells which is missing in MDA-MB-468 cells and in MCF-7 cells. This current is high-voltage-activated and displays a window current at the membrane potential of MDA-MB-231 cells. This current is blocked by high concentrations of tetrodotoxin (TTX). In MDA-MB-231 cells, which are the most invasive cells among the three cell lines tested, proliferation and migration were not sensitive to TTX while invasion was reduced by approximately 30%. These experiments suggest that I-Na is involved in the invasion process, probably through its participation to the regulation of the intracellular sodium homeostasis. (C) 2003 Elsevier B.V. All rights reserved.
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