| PKCβ inhibition with ruboxistaurin reduces oxidative stress and attenuates left ventricular hypertrophy and dysfunction in rats with streptozotocin-induced diabetes. | |
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MedLine Citation:
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PMID: 21892921 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Oxidative stress plays critical roles in the development of diabetic cardiovascular complications, including myocardial hypertrophy. The β isoform of PKC (protein kinase C) is preferentially overexpressed in the myocardium of diabetic subjects accompanied with increased activation of the pro-oxidant enzyme NADPH oxidase, which may exacerbate oxidative stress. We hypothesized that myocardial PKCβ is a major upstream mediator of oxidative stress in diabetes and that PKCβ inhibition can attenuate myocardial hypertrophy and dysfunction. Control or streptozotocin-induced diabetic rats were treated with the selective PKCβ inhibitor RBX (ruboxistaurin; 1 mg/kg of body weight per day) or the antioxidant NAC (N-acetylcysteine) for 4 weeks. LV (left ventricular) dimensions and functions were detected by echocardiography. 15-F2t-isoprostane (a specific index of oxidative stress) and myocardial activities of superoxide dismutase as well as protein levels of NADPH oxidase were assessed by immunoassay or Western blotting. Echocardiography revealed that the LV mass/body weight ratio was significantly increased in diabetic rats (P<0.01 compared with the control group) in parallel with the impaired LV relaxation. A significant increase in cardiomyocyte cross-sectional area was observed in diabetic rats accompanied by an increased production of O2- (superoxide anion) and 15-F2t-isoprostane (all P<0.05 compared with the control group). RBX normalized these changes with concomitant inhibition of PKCβ2 activation and prevention of NADPH oxidase subunit p67phox membrane translocation and p22phox overexpression. The effects of RBX were comparable with that of NAC, except that NAC was inferior to RBX in attenuating cardiac dysfunction. It is concluded that RBX can ameliorate myocardial hypertrophy and dysfunction in diabetes, which may represent a novel therapy in the prevention of diabetic cardiovascular complications. |
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Authors:
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Yanan Liu; Shaoqing Lei; Xia Gao; Xiaowen Mao; Tingting Wang; Gordon T Wong; Paul M Vanhoutte; Michael G Irwin; Zhengyuan Xia |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Clinical science (London, England : 1979) Volume: 122 ISSN: 1470-8736 ISO Abbreviation: Clin. Sci. Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2011-10-27 Completed Date: 2011-12-19 Revised Date: 2012-01-05 |
Medline Journal Info:
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Nlm Unique ID: 7905731 Medline TA: Clin Sci (Lond) Country: England |
Other Details:
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Languages: eng Pagination: 161-73 Citation Subset: IM |
Affiliation:
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Department of Anesthesiology, The University of Hong Kong, China. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acetylcysteine
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pharmacology,
therapeutic use Animals Diabetes Mellitus, Experimental / complications Diabetic Cardiomyopathies / prevention & control* Drug Evaluation, Preclinical Enzyme Activation / drug effects Free Radical Scavengers / pharmacology, therapeutic use Hypertrophy, Left Ventricular / etiology, prevention & control*, ultrasonography Indoles / pharmacology, therapeutic use* Isoprostanes / blood Male Maleimides / pharmacology, therapeutic use* Myocytes, Cardiac / drug effects, enzymology NADPH Oxidase / antagonists & inhibitors, metabolism Oxidative Stress / drug effects* Protein Kinase C / antagonists & inhibitors* Rats Rats, Sprague-Dawley Superoxides / metabolism |
| Chemical | |
Reg. No./Substance:
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0/15-F2t-isoprostane; 0/Free Radical Scavengers; 0/Indoles; 0/Isoprostanes; 0/Maleimides; 11062-77-4/Superoxides; 169939-94-0/ruboxistaurin; 616-91-1/Acetylcysteine; EC 1.6.3.1/NADPH Oxidase; EC 2.7.1.-/protein kinase C beta; EC 2.7.11.13/Protein Kinase C |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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