Cited by 176Ion channel regulation and functionIon Channels and ReceptorsCardiac electrophysiology and arrhythmias

The neonatal splice variant of Nav1.5 potentiates in vitro invasive behaviour of MDA-MB-231 human breast cancer cells

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Brackenbury, William J., Chioni, Athina-Myrto, Diss, James K. J., Djamgoz, Mustafa B. A.·2007·Breast Cancer Research and Treatment

Abstract

Upregulation of functional voltage-gated Na+ channels (VGSCs) occurs in metastatic human breast cancer (BCa) in vitro and in vivo. The present study aimed to ascertain the specific involvement of the "neonatal" splice variant of Nav1.5 (nNav1.5), thought to be predominant, in the VGSC-dependent invasive behaviour of MDA-MB-231 cells. Functional activity of nNav1.5 was suppressed by two different methods targeting nNav1.5: (i) small interfering RNA (siRNA), and (ii) a polyclonal antibody (NESO-pAb); effects upon migration and invasion were determined. nNav1.5 mRNA, protein and signalling were measured using real-time PCR, Western blotting, and patch clamp recording, respectively. Treatment with the siRNA rapidly reduced (by approximately 90%) the level of nNav1.5 (but not adult Nav1.5) mRNA, but the protein reduction was much smaller (approximately 30%), even after 13 days. Nevertheless, the siRNA reduced peak VGSC current density by 33%, and significantly increased the cells' sensitivity to nanomolar tetrodotoxin (TTX). Importantly, the siRNA suppressed in vitro migration by 43%, and eliminated the normally inhibitory effect of TTX. Migrated MDA-MB-231 cells expressed more nNav1.5 protein at the plasma membrane than non-migrated cells. Furthermore, NESO-pAb reduced migration by up to 42%, in a dose-dependent manner. NESO-pAb also reduced Matrigel invasion without affecting proliferation. TTX had no effect on cells already treated with NESO-pAb. It was concluded that nNav1.5 is primarily responsible for the VGSC-dependent enhancement of invasive behaviour in MDA-MB-231 cells. Accordingly, targeting nNav1.5 expression/activity may be useful in clinical management of metastatic BCa.

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Research works printed but not linked: 2

  1. [5]Fraser SP Koyuturk M Djamgoz MB Rouzaire-Dubois B Benoit E Dubois JM Ion channel activity and cancer cell proliferation: A short review with particular reference to prostate cancer Ion Channels and Physiopathologies of Nerve Conduction and Cell Proliferation 2002 Research Signpost 1st edn.
  2. [40]Grimes JA Djamgoz MB Electrophysiological characterization of voltage-gated Na(+) current expressed in the highly metastatic Mat-LyLu cell line of rat prostate cancer J Cell Physiol 1998 175 1 50 58 9491780

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Authors
Brackenbury, W. J., Chioni, A.-M., Diss, J. K. J., & Djamgoz, M. B. A.
Affiliations
  • Imperial College London (GB)
  • University College London (GB)
Corresponding author
Djamgoz, Mustafa B. A.
Venue
Breast Cancer Research and Treatment
Published
2006-07-13
Volume
101
Issue
2
Pages
149-160
ISSN
  • 0167-6806 (ISSN-L)
  • 1573-7217
OpenAlex
W2091102347
Cited by
175
References
69
Citations by year
2026: 4 · 2025: 11 · 2024: 11 · 2023: 10 · 2022: 16 · 2021: 9 · 2020: 11 · 2019: 15 · 2018: 10 · 2017: 5 · 2016: 7 · 2015: 16 · 2014: 7 · 2013: 7 · 2012: 5
FWCI
2.31
Type
journal article
Language
en
Open access
Locations
  • Breast Cancer Research and Treatment (publishedVersion)
  • PubMed (publishedVersion)
  • White Rose Research Online (University of Leeds, The University of Sheffield, University of York) (acceptedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
Keywords
cardiac sodium channel, voltage-gated sodium channels, breast cancer metastasis, MDA-MB-231 cells, cell invasion, cell migration, tetrodotoxin sensitivity, siRNA knockdown, polyclonal antibodies
MeSH terms
Breast Neoplasms, Cell Movement, Female, Humans, Image Processing, Computer-Assisted, Immunohistochemistry, Infant, Newborn, Muscle Proteins, Neoplasm Invasiveness, Tetrodotoxin, Blotting, Western, Sodium Channels, Patch-Clamp Techniques, Microscopy, Confocal, Protein Isoforms, Reverse Transcriptase Polymerase Chain Reaction, Sodium Channel Blockers, RNA, Small Interfering, Cell Line, Tumor, NAV1.5 Voltage-Gated Sodium Channel, In Vitro Techniques

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