Plumbagin-induced oxidative stress leads to inhibition of Na+/K+-ATPase (NKA) in canine cancer cells

Abstract The Na+/K+-ATPase (NKA) complex is the master regulator of membrane potential and a target for anti-cancer therapies. Here, we investigate the effect of drug-induced oxidative stress on NKA activity. The natural product, plumbagin increases oxygen radicals through inhibition of oxidative ph...

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Main Authors: Yousef Alharbi, Arvinder Kapur, Mildred Felder, Lisa Barroilhet, Timothy Stein, Bikash R. Pattnaik, Manish S. Patankar
Format: Article
Language:English
Published: Nature Publishing Group 2019-08-01
Series:Scientific Reports
Online Access:https://doi.org/10.1038/s41598-019-47261-x
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spelling doaj-711cb0ad0da842b3aed61841711db73e2020-12-08T09:51:48ZengNature Publishing GroupScientific Reports2045-23222019-08-019111010.1038/s41598-019-47261-xPlumbagin-induced oxidative stress leads to inhibition of Na+/K+-ATPase (NKA) in canine cancer cellsYousef Alharbi0Arvinder Kapur1Mildred Felder2Lisa Barroilhet3Timothy Stein4Bikash R. Pattnaik5Manish S. Patankar6Department of Obstetrics and Gynecology, University of Wisconsin-MadisonDepartment of Obstetrics and Gynecology, University of Wisconsin-MadisonDepartment of Obstetrics and Gynecology, University of Wisconsin-MadisonDepartment of Obstetrics and Gynecology, University of Wisconsin-MadisonDepartment of Comparative Biosciences, School of Veterinary Medicine, University of Wisconsin-MadisonDepartment of Pediatrics and Ophthalmology and Visual Sciences, University of Wisconsin-MadisonDepartment of Obstetrics and Gynecology, University of Wisconsin-MadisonAbstract The Na+/K+-ATPase (NKA) complex is the master regulator of membrane potential and a target for anti-cancer therapies. Here, we investigate the effect of drug-induced oxidative stress on NKA activity. The natural product, plumbagin increases oxygen radicals through inhibition of oxidative phosphorylation. As a result, plumbagin treatment results in decreased production of ATP and a rapid increase in intracellular oxygen radicals. We show that plumbagin induces apoptosis in canine cancer cells via oxidative stress. We use this model to test the effect of oxidative stress on NKA activity. Using whole-cell patch-clamp electrophysiology we demonstrate that short-term exposure (4 min) to plumbagin results in 48% decrease in outward current at +50 mV. Even when exogenous ATP was supplied to the cells, plumbagin treatment resulted in 46% inhibition of outward current through NKA at +50 mV. In contrast, when the canine cancer cells were pre-treated with the oxygen radical scavenger, N-acetylcysteine, the NKA inhibitory activity of plumbagin was abrogated. These experiments demonstrate that the oxidative stress-causing agents such as plumbagin and its analogues, are a novel avenue to regulate NKA activity in tumors.https://doi.org/10.1038/s41598-019-47261-x
collection DOAJ
language English
format Article
sources DOAJ
author Yousef Alharbi
Arvinder Kapur
Mildred Felder
Lisa Barroilhet
Timothy Stein
Bikash R. Pattnaik
Manish S. Patankar
spellingShingle Yousef Alharbi
Arvinder Kapur
Mildred Felder
Lisa Barroilhet
Timothy Stein
Bikash R. Pattnaik
Manish S. Patankar
Plumbagin-induced oxidative stress leads to inhibition of Na+/K+-ATPase (NKA) in canine cancer cells
Scientific Reports
author_facet Yousef Alharbi
Arvinder Kapur
Mildred Felder
Lisa Barroilhet
Timothy Stein
Bikash R. Pattnaik
Manish S. Patankar
author_sort Yousef Alharbi
title Plumbagin-induced oxidative stress leads to inhibition of Na+/K+-ATPase (NKA) in canine cancer cells
title_short Plumbagin-induced oxidative stress leads to inhibition of Na+/K+-ATPase (NKA) in canine cancer cells
title_full Plumbagin-induced oxidative stress leads to inhibition of Na+/K+-ATPase (NKA) in canine cancer cells
title_fullStr Plumbagin-induced oxidative stress leads to inhibition of Na+/K+-ATPase (NKA) in canine cancer cells
title_full_unstemmed Plumbagin-induced oxidative stress leads to inhibition of Na+/K+-ATPase (NKA) in canine cancer cells
title_sort plumbagin-induced oxidative stress leads to inhibition of na+/k+-atpase (nka) in canine cancer cells
publisher Nature Publishing Group
series Scientific Reports
issn 2045-2322
publishDate 2019-08-01
description Abstract The Na+/K+-ATPase (NKA) complex is the master regulator of membrane potential and a target for anti-cancer therapies. Here, we investigate the effect of drug-induced oxidative stress on NKA activity. The natural product, plumbagin increases oxygen radicals through inhibition of oxidative phosphorylation. As a result, plumbagin treatment results in decreased production of ATP and a rapid increase in intracellular oxygen radicals. We show that plumbagin induces apoptosis in canine cancer cells via oxidative stress. We use this model to test the effect of oxidative stress on NKA activity. Using whole-cell patch-clamp electrophysiology we demonstrate that short-term exposure (4 min) to plumbagin results in 48% decrease in outward current at +50 mV. Even when exogenous ATP was supplied to the cells, plumbagin treatment resulted in 46% inhibition of outward current through NKA at +50 mV. In contrast, when the canine cancer cells were pre-treated with the oxygen radical scavenger, N-acetylcysteine, the NKA inhibitory activity of plumbagin was abrogated. These experiments demonstrate that the oxidative stress-causing agents such as plumbagin and its analogues, are a novel avenue to regulate NKA activity in tumors.
url https://doi.org/10.1038/s41598-019-47261-x
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