Document Detail


Uncoupling protein downregulation in doxorubicin-induced heart failure improves mitochondrial coupling but increases reactive oxygen species generation.
MedLine Citation:
PMID:  20809120     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: Doxorubicin-based chemotherapy is limited by the development of dose-dependent left ventricular dysfunction and congestive heart failure caused by reactive oxygen species (ROS). Uncoupling proteins (UCP) can inhibit mitochondrial ROS production as well as decrease myocyte damage from exogenous ROS. Prior studies have shown that cardiac UCP2 and UCP3 mRNA expression is decreased with acute doxorubicin treatment. However, the expression of UCP protein in hearts with doxorubicin cardiotoxicity and the resultant changes in mitochondrial function and oxidant stress have not been determined.
METHODS: Heart failure was induced in Sprague-Dawley rats with intraperitoneal injections of doxorubicin (2 mg/kg t.i.w., total dose: 18 mg/kg). Mitochondria were isolated from mice receiving doxorubicin or saline injections for determination of UCP2 and UCP3 expression. In addition, mitochondrial respiration, ATP synthesis and ROS production were determined.
RESULTS: Doxorubicin-induced heart failure was associated with significant decreases in UCP2 and UCP3 protein expression compared with nonfailing hearts (P < 0.05). While the rates of state 3 and state 4 respiration and ATP synthesis were lower in mitochondria isolated from failing hearts, the respiratory control ratio was 15% higher (P < 0.05), and the ratio of ATP production to oxygen consumption was 25% higher (P < 0.05) in mitochondria from failing hearts, indicating greater coupling between citric acid cycle flux and mitochondrial ATP synthesis. However, the decrease in UCP expression was associated with 50% greater mitochondrial ROS generation (P < 0.05).
CONCLUSIONS: Downregulation of myocardial UCP2 and UCP3 in the setting of doxorubicin-induced heart failure is associated with improved efficiency of ATP synthesis, which might compensate for abnormal energy metabolism. However, this beneficial effect is counterbalanced by greater oxidant stress.
Authors:
Heiko Bugger; Cinthia Guzman; Christoph Zechner; Monica Palmeri; Kerry S Russell; Raymond R Russell
Publication Detail:
Type:  In Vitro; Journal Article; Research Support, N.I.H., Extramural     Date:  2010-08-31
Journal Detail:
Title:  Cancer chemotherapy and pharmacology     Volume:  67     ISSN:  1432-0843     ISO Abbreviation:  Cancer Chemother. Pharmacol.     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-05-26     Completed Date:  2011-07-22     Revised Date:  2013-05-28    
Medline Journal Info:
Nlm Unique ID:  7806519     Medline TA:  Cancer Chemother Pharmacol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1381-8     Citation Subset:  IM    
Affiliation:
Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, 333 Cedar Street, FMP 3, New Haven, CT 06520, USA.
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MeSH Terms
Descriptor/Qualifier:
Adenosine Triphosphate / biosynthesis
Animals
Antibiotics, Antineoplastic / toxicity*
Down-Regulation
Doxorubicin / toxicity*
Heart Failure / chemically induced,  metabolism*,  physiopathology
Ion Channels / biosynthesis*
Male
Mice
Mitochondria, Heart / drug effects*,  metabolism
Mitochondrial Proteins / biosynthesis*
Myocardium / metabolism,  pathology
Rats
Rats, Sprague-Dawley
Reactive Oxygen Species / metabolism*
Ventricular Function, Left / drug effects
Grant Support
ID/Acronym/Agency:
R01 HL077310/HL/NHLBI NIH HHS; R01 HL077310-05/HL/NHLBI NIH HHS; R01 HL080176-05/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Antibiotics, Antineoplastic; 0/Ion Channels; 0/Mitochondrial Proteins; 0/Reactive Oxygen Species; 0/mitochondrial uncoupling protein 2; 0/mitochondrial uncoupling protein 3; 23214-92-8/Doxorubicin; 56-65-5/Adenosine Triphosphate
Comments/Corrections

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