4-Hydroxy-2-nonenal induces calcium overload via the generation of reactive oxygen species in isolated rat cardiac myocytes.

Abstract:

BACKGROUND:It has been reported that that the amount of 4-hydroxy-2-nonenal (HNE), which is a major lipid peroxidation product and a cytotoxic aldehyde, is increased in the human failing myocardium. This study was designed to determine whether HNE has a pro-oxidant effect in cardiac myocytes and whether HNE causes Ca(2+) overload. METHODS AND RESULTS:Exposure to HNE for 10 minutes in the presence of ferric nitrilotriacetate induced the production of hydroxyl radical (.OH) in the rat myocardium as assessed by electron spin resonance spectroscopy, and HNE induced the generation of reactive oxygen species (ROS) in a dose-dependent manner as assessed by 2', 7'-dichlorofluorescein diacetate fluorescence. HNE increased intracellular Ca(2+) concentration ([Ca(2+)](i)) as assessed by fura-2 ratio in a dose- and time-dependent manner. After 20 minutes of HNE (400 micromol/L) exposure, hypercontracture was induced in 67% of the cells. Catalase, an antioxidative enzyme that can decompose hydrogen peroxide (H(2)O(2)), significantly attenuated the increase in [Ca(2+)](i) and completely inhibited hypercontracture. Carvedilol, a beta-blocker with potent antioxidant activity, also significantly attenuated the increase in [Ca(2+)](i) and completely inhibited hypercontracture, but propranolol had no effect on either [Ca(2+)](i) increase or hypercontracture. CONCLUSIONS:HNE induces the formation of ROS, especially H(2)O(2) and .OH, in cardiomyocytes and subsequently ROS cause intracellular Ca(2+) overload. HNE formation may play an important role as a mediator of oxidative stress in heart failure.

journal_name

J Card Fail

authors

Nakamura K,Miura D,Kusano KF,Fujimoto Y,Sumita-Yoshikawa W,Fuke S,Nishii N,Nagase S,Hata Y,Morita H,Matsubara H,Ohe T,Ito H

doi

10.1016/j.cardfail.2009.04.008

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

709-16

issue

8

eissn

1071-9164

issn

1532-8414

pii

S1071-9164(09)00138-9

journal_volume

15

pub_type

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