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Neuromuscul Disord. 2018 Apr;28(4):361-372. doi: 10.1016/j.nmd.2018.01.012. Epub 2018 Feb 2.

Normalization of connexin 43 protein levels prevents cellular and functional signs of dystrophic cardiomyopathy in mice.

Author information

1
Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, NJ, USA.
2
Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, NJ, USA.
3
Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, NJ, USA. Electronic address: nshiroko@njms.rutgers.edu.
4
Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, NJ, USA. Electronic address: contrejo@njms.rutgers.edu.
5
Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, NJ, USA. Electronic address: fraidedi@rutgers.edu.

Abstract

Duchenne muscular dystrophy (DMD) associated cardiomyopathy remains incurable. Connexin 43 (Cx43) is upregulated and remodeled in the hearts of mdx mice, a mouse model of DMD. Hearts from Wild Type, mdx, and mdx:Cx43(+/-) mice were studied before (4-6 months) and after (10-15 months) the onset of cardiomyopathy to assess the impact of decreasing Cx43 levels on cardiac pathology in dystrophic mice. Increased connexin 43 protein levels in mdx hearts were not observed in mdx:Cx43(+/-) hearts. Cx43 remodeling in mdx hearts was attenuated in mdx:Cx43(+/-) hearts. At time-point 4-6 months, isolated cardiomyocytes from mdx hearts displayed enhanced ethidium bromide uptake, augmented intracellular calcium signals and increased production of reactive oxygen species. These pathological features were improved in mdx:Cx43(+/-) cardiomyocytes. Isoproterenol-challenged mdx:Cx43(+/-) mice did not show arrhythmias or acute lethality observed in mdx mice. Likewise, isoproterenol-challenged mdx:Cx43(+/-) isolated hearts were also protected from arrhythmogenesis. At time-point 10-15 months, mdx:Cx43(+/-) mice showed decreased cardiac fibrosis and improved ventricular function, relative to mdx mice. These results suggest that normalization of connexin 43 protein levels in mdx mice reduces overall cardiac pathology.

KEYWORDS:

Calcium handling; Cardiomyopathy; Connexin; Duchenne muscular dystrophy; Oxidative stress

PMID:
29477453
DOI:
10.1016/j.nmd.2018.01.012
[Indexed for MEDLINE]

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