Cardiac Electrophysiological Alterations in HeartMuscle-Specific Manganese-Superoxide Dismutase-Deficient Mice : Prevention by a Dietary Antioxidant Polyphenol

Joint Authors

Shirasawa, Takuji
Matsumoto, Akio
Shimizu, Takahiko
Tagashira, Motoyuki
Nakaya, Haruaki
Sunagawa, Tadahiro
Kanda, Tomomasa

Source

BioMed Research International

Issue

Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-12, 12 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2014-03-19

Country of Publication

Egypt

No. of Pages

12

Main Subjects

Medicine

Abstract EN

Cardiac electrophysiological alterations induced by chronic exposure to reactive oxygen species and protective effects of dietary antioxidant have not been thoroughly examined.

We recorded surface electrocardiograms (ECG) and evaluated cellular electrophysiological abnormalities in enzymatically-dissociated left ventricular (LV) myocytes in heart/muscle-specific manganese-superoxide dismutase-deficient (H/M-Sod2−/−) mice, which exhibit dilated cardiomyopathy due to increased oxidative stress.

We also investigated the influences of intake of apple polyphenols (AP) containing mainly procyanidins with potent antioxidant activity.

The QRS and QT intervals of ECG recorded in H/M-Sod2−/− mice were prolonged.

The effective refractory period in the LV myocardium of H/M-Sod2−/− mice was prolonged, and susceptibility to ventricular tachycardia or fibrillation induced by rapid ventricular pacing was increased.

Action potential duration in H/M-Sod2−/− LV myocytes was prolonged, and automaticity was enhanced.

The density of the inwardly rectifier K+ current (IK1) was decreased in the LV cells of H/M-Sod2−/− mice.

The AP intake partially improved these electrophysiological alterations and extended the lifespan in H/M-Sod2−/− mice.

Thus, chronic exposure of the heart to oxidative stress produces a variety of electrophysiological abnormalities, increased susceptibility to ventricular arrhythmias, and action potential changes associated with the reduced density of IK1.

Dietary intake of antioxidant nutrients may prevent oxidative stress-induced electrophysiological disturbances.

American Psychological Association (APA)

Sunagawa, Tadahiro& Shimizu, Takahiko& Matsumoto, Akio& Tagashira, Motoyuki& Kanda, Tomomasa& Shirasawa, Takuji…[et al.]. 2014. Cardiac Electrophysiological Alterations in HeartMuscle-Specific Manganese-Superoxide Dismutase-Deficient Mice : Prevention by a Dietary Antioxidant Polyphenol. BioMed Research International،Vol. 2014, no. 2014, pp.1-12.
https://search.emarefa.net/detail/BIM-491913

Modern Language Association (MLA)

Sunagawa, Tadahiro…[et al.]. Cardiac Electrophysiological Alterations in HeartMuscle-Specific Manganese-Superoxide Dismutase-Deficient Mice : Prevention by a Dietary Antioxidant Polyphenol. BioMed Research International No. 2014 (2014), pp.1-12.
https://search.emarefa.net/detail/BIM-491913

American Medical Association (AMA)

Sunagawa, Tadahiro& Shimizu, Takahiko& Matsumoto, Akio& Tagashira, Motoyuki& Kanda, Tomomasa& Shirasawa, Takuji…[et al.]. Cardiac Electrophysiological Alterations in HeartMuscle-Specific Manganese-Superoxide Dismutase-Deficient Mice : Prevention by a Dietary Antioxidant Polyphenol. BioMed Research International. 2014. Vol. 2014, no. 2014, pp.1-12.
https://search.emarefa.net/detail/BIM-491913

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-491913