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Mitochondrial calcium uniporter blocker prevents cardiac mitochondrial dysfunction induced by iron overload in thalassemic mice.
MedLine Citation:
PMID:  22910858     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Iron-overload induced cardiomyopathy is a major cause of morbidity and mortality in thalassemic patients. Previous studies suggest that cardiac mitochondrial dysfunction may be involved in the pathogenesis of cardiomyopathy in thalassemia. We tested the hypothesis that iron overload causes dysfunction of cardiac mitochondria isolated from thalassemic mice. Cardiac mitochondria were isolated from the heart tissue of genetically-altered, β-thalassemic mice (HT) and adult wild-type mice (WT). Ferrous iron (Fe(2+)) at various concentrations (0-5 μg/ml) was applied to induce iron toxicity. Pharmacological interventions, facilitated by mitochondrial permeability transition pore (mPTP) blocker, CsA, and mitochondrial Ca(2+) uniporter (MCU) blocker, Ru360, were used to study their respective effects on cardiac mitochondrial dysfunction. Cardiac mitochondrial ROS production, mitochondrial membrane potential changes, and mitochondrial swelling were determined. Iron overload caused increased ROS production, mitochondrial depolarization, and mitochondrial swelling in a dose-dependent manner in WT and HT cardiac mitochondria. CsA decreased only ROS production in WT and HT cardiac mitochondria, whereas Ru360 completely prevented the development of cardiac mitochondrial dysfunction by decreasing ROS, mitochondrial depolarization, and swelling in both WT and HT cardiac mitochondria. Ru360, an MCU blocker, provides protective effects by preventing ROS production and mitochondrial depolarization as well as attenuating mitochondrial swelling caused by Fe(2+) overload. These findings indicate that the MCU could be a major portal for Fe(2+) entry into cardiac mitochondria. Therefore, blocking MCU may be an effective therapy to prevent iron-overload induced cardiac mitochondrial dysfunction in patients with thalassemia.
Authors:
Sirinart Kumfu; Siriporn Chattipakorn; Suthat Fucharoen; Nipon Chattipakorn
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-22
Journal Detail:
Title:  Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine     Volume:  -     ISSN:  1572-8773     ISO Abbreviation:  Biometals     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9208478     Medline TA:  Biometals     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand.
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