The conformational state of hERG1 channels determines integrin association, downstream signaling, and cancer progression

Andrea Becchetti, Silvia Crescioli, Francesca Zanieri, Giulia Petroni, Raffaella Mercatelli, Stefano Coppola, Luca Gasparoli, Massimo D'Amico, Serena Pillozzi, Olivia Crociani, Matteo Stefanini, Antonella Fiore, Laura Carraresi, Virginia Morello, Sagar Manoli, Maria Felice Brizzi, Davide Ricci, Mauro Rinaldi, Alessio Masi, Thomas SchmidtFranco Quercioli, Paola Defilippi, Annarosa Arcangeli

Research output: Contribution to journalArticlepeer-review

Abstract

Ion channels regulate cell proliferation, differentiation, and migration in normal and neoplastic cells through cell-cell and cell-extracellular matrix (ECM) transmembrane receptors called integrins. K+ flux through the human ether-à-gogo- related gene 1 (hERG1) channel shapes action potential firing in excitable cells such as cardiomyocytes. Its abundance is often aberrantly high in tumors, where it modulates integrin-mediated signaling. We found that hERG1 interacted with the β1 integrin subunit at the plasma membrane of human cancer cells. This interaction was not detected in cardiomyocytes because of the presence of the hERG1 auxiliary subunit KCNE1 (potassium voltage-gated channel subfamily E regulatory subunit 1), which blocked the β1 integrin-hERG1 interaction. Although open hERG1 channels did not interact as strongly with β1 integrins as did closed channels, current flow through hERG1 channelswas necessary to activate the integrin-dependent phosphorylation of Tyr397 in focal adhesion kinase (FAK) in both normal and cancer cells. In immunodeficient mice, proliferation was inhibited in breast cancer cells expressing forms of hERG1 with impaired K+ flow, whereas metastasis of breast cancer cells was reduced when the hERG1/β1 integrin interaction was disrupted. We conclude that the interaction of β1 integrins with hERG1 channels in cancer cells stimulated distinct signaling pathways that depended on the conformational state of hERG1 and affected different aspects of tumor progression.

Original languageEnglish
Article numbereaaf3236
JournalScience Signaling
Volume10
Issue number473
DOIs
Publication statusPublished - Apr 4 2017

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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