Abstract:
BACKGROUND:Cardiomyopathy in Duchenne muscular dystrophy (DMD) is an increasing cause of death in patients. The absence of dystrophin leads to loss of membrane integrity, cell death and fibrosis in cardiac muscle. Treatment of cardiomyocyte membrane instability could help prevent cardiomyopathy. METHODS:Three month old female mdx mice were exposed to the β(1) receptor agonist isoproterenol subcutaneously and treated with the non-ionic tri-block copolymer Poloxamer P188 (P188) (460 mg/kg/dose i.p. daily). Cardiac function was assessed using high frequency echocardiography. Tissue was evaluated with Evans Blue Dye (EBD) and picrosirius red staining. RESULTS:BL10 control mice tolerated 30 mg/kg/day of isoproterenol for 4 weeks while death occurred in mdx mice at 30, 15, 10, 5 and 1 mg/kg/day within 24 hours. Mdx mice tolerated a low dose of 0.5 mg/kg/day. Isoproterenol exposed mdx mice showed significantly increased heart rates (p < 0.02) and cardiac fibrosis (p < 0.01) over 4 weeks compared to unexposed controls. P188 treatment of mdx mice significantly increased heart rate (median 593 vs. 667 bpm; p < 0.001) after 2 weeks and prevented a decrease in cardiac function in isoproterenol exposed mice (Shortening Fraction = 46 ± 6% vs. 35 ± 6%; p = 0.007) after 4 weeks. P188 treated mdx mice did not show significant differences in cardiac fibrosis, but demonstrated significantly increased EBD positive fibers. CONCLUSIONS:This model suggests that chronic intermittent intraperitoneal P188 treatment can prevent isoproterenol induced cardiomyopathy in dystrophin deficient mdx mice.
journal_name
BMC Cardiovasc Disordjournal_title
BMC cardiovascular disordersauthors
Spurney CF,Guerron AD,Yu Q,Sali A,van der Meulen JH,Hoffman EP,Nagaraju Kdoi
10.1186/1471-2261-11-20subject
Has Abstractpub_date
2011-05-16 00:00:00pages
20issn
1471-2261pii
1471-2261-11-20journal_volume
11pub_type
杂志文章abstract:BACKGROUND:To help patients with coronary artery disease (CAD) benefit from the positive health effects attained by exercise-based cardiac rehabilitation (CR), adherence to these programmes according to international guidelines is important. Strategies to increase adherence to exercise-based CR are mainly an unexplored...
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pub_type: 杂志文章,多中心研究,随机对照试验
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pub_type: 杂志文章,meta分析
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pub_type: 杂志文章
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pub_type: 杂志文章,多中心研究,随机对照试验
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pub_type: 杂志文章
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更新日期:2008-07-26 00:00:00
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pub_type: 杂志文章
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