Biophysical Characterization of Epigallocatechin-3-Gallate Effect on the Cardiac Sodium Channel Nav1.5.

Amarouch, Mohamed-Yassine; Kurt, Han; Delemotte, Lucie; Abriel, Hugues (2020). Biophysical Characterization of Epigallocatechin-3-Gallate Effect on the Cardiac Sodium Channel Nav1.5. Molecules, 25(4), p. 902. Molecular Diversity Preservation International MDPI 10.3390/molecules25040902

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Epigallocatechin-3-Gallate (EGCG) has been extensively studied for its protective effect against cardiovascular disorders. This effect has been attributed to its action on multiple molecular pathways and transmembrane proteins, including the cardiac Nav1.5 channels, which are inhibited in a dose-dependent manner. However, the molecular mechanism underlying this effect remains to be unveiled. To this aim, we have characterized the EGCG effect on Nav1.5 using electrophysiology and molecular dynamics (MD) simulations. EGCG superfusion induced a dose-dependent inhibition of Nav1.5 expressed in tsA201 cells, negatively shifted the steady-state inactivation curve, slowed the inactivation kinetics, and delayed the recovery from fast inactivation. However, EGCG had no effect on the voltage-dependence of activation and showed little use-dependent block on Nav1.5. Finally, MD simulations suggested that EGCG does not preferentially stay in the center of the bilayer, but that it spontaneously relocates to the membrane headgroup region. Moreover, no sign of spontaneous crossing from one leaflet to the other was observed, indicating a relatively large free energy barrier associated with EGCG transport across the membrane. These results indicate that EGCG may exert its biophysical effect via access to its binding site through the cell membrane or via a bilayer-mediated mechanism.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Biochemistry and Molecular Medicine

UniBE Contributor:

Abriel, Hugues

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

1420-3049

Publisher:

Molecular Diversity Preservation International MDPI

Language:

English

Submitter:

Barbara Järmann-Bangerter

Date Deposited:

26 Aug 2020 08:36

Last Modified:

04 Sep 2020 09:26

Publisher DOI:

10.3390/molecules25040902

PubMed ID:

32085432

Uncontrolled Keywords:

EGCG Nav1.5 cellular electrophysiology ion channels molecular dynamics

BORIS DOI:

10.7892/boris.146121

URI:

https://boris.unibe.ch/id/eprint/146121

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