Influence of the extracellular matrix and integrins on volume-sensitive osmolyte anion channels in C2C12 myoblasts.

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Output type: Other

Author list: Neveux I, Doe J, Leblanc N, Valencik ML

Publication year: 2010

Journal acronym: Am J Physiol Cell Physiol

Volume number: 298

Issue number: 5

Start page: C1006

End page: 17

ISSN: 1522-1563

eISSN: 1522-1563

Languages: English-Great Britain (EN-GB)

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Open access status: green

Full text URL: https://europepmc.org/articles/pmc2867394

Abstract

The purpose of this study was to determine whether extracellular matrix (ECM) composition through integrin receptors modulated the volume-sensitive osmolyte anion channels (VSOACs) in skeletal muscle-derived C2C12 cells. Cl(-) currents were recorded in whole cell voltage-clamped cells grown on laminin (LM), fibronectin (FN), or in the absence of a defined ECM (NM). Basal membrane currents recorded in isotonic media (300 mosmol/kg) were larger in cells grown on FN (3.8-fold at +100 mV) or LM (8.8-fold at +100 mV) when compared with NM. VSOAC currents activated by cell exposure to hypotonic solution were larger in cells grown on LM (1.72-fold at +100 mV) or FN (1.75-fold at +100 mV) compared with NM. Additionally, the kinetics of VSOAC activation was approximately 27% quicker on FN and LM. These currents were tamoxifen sensitive, displayed outward rectification, reversed at the equilibrium potential of Cl(-) and inactivated at potentials >+60 mV. Specific knockdown of beta(1)-integrin by short hairpin RNA interference strongly inhibited the VSOAC Cl(-) currents in cells plated on FN. In conclusion, ECM composition and integrins profoundly influence the biophysical properties and mechanisms of onset of VSOACs.

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