| Myocardial insulin resistance induced by high fat feeding in heart failure is associated with preserved contractile function. | |
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MedLine Citation:
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PMID: 20852054 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Previous studies have reported that high fat feeding in mild to moderate heart failure (HF) results in the preservation of contractile function. Recent evidence has suggested that preventing the switch from fatty acid to glucose metabolism in HF may ameliorate dysfunction, and insulin resistance is one potential mechanism for regulating substrate utilization. This study was designed to determine whether peripheral and myocardial insulin resistance exists with HF and/or a high-fat diet and whether myocardial insulin signaling was altered accordingly. Rats underwent coronary artery ligation (HF) or sham surgery and were randomized to normal chow (NC; 14% kcal from fat) or a high-fat diet (SAT; 60% kcal from fat) for 8 wk. HF + SAT animals showed preserved systolic (+dP/dt and stroke work) and diastolic (-dP/dt and time constant of relaxation) function compared with HF + NC animals. Glucose tolerance tests revealed peripheral insulin resistance in sham + SAT, HF + NC, and HF + SAT animals compared with sham + NC animals. PET imaging confirmed myocardial insulin resistance only in HF + SAT animals, with an uptake ratio of 2.3 ± 0.3 versus 4.6 ± 0.7, 4.3 ± 0.4, and 4.2 ± 0.6 in sham + NC, sham + SAT, and HF + NC animals, respectively; the myocardial glucose utilization rate was similarly decreased in HF + SAT animals only. Western blot analysis of insulin signaling protein expression was indicative of cardiac insulin resistance in HF + SAT animals. Specifically, alterations in Akt and glycogen synthase kinase-3β protein expression in HF + SAT animals compared with HF + NC animals may be involved in mediating myocardial insulin resistance. In conclusion, HF animals fed a high-saturated fat exhibited preserved myocardial contractile function, peripheral and myocardial insulin resistance, decreased myocardial glucose utilization rates, and alterations in cardiac insulin signaling. These results suggest that myocardial insulin resistance may serve a cardioprotective function with high fat feeding in mild to moderate HF. |
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Authors:
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Bridgette A Christopher; Hsuan-Ming Huang; Jessica M Berthiaume; Tracy A McElfresh; Xiaoqin Chen; Colleen M Croniger; Raymond F Muzic; Margaret P Chandler |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2010-09-17 |
Journal Detail:
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Title: American journal of physiology. Heart and circulatory physiology Volume: 299 ISSN: 1522-1539 ISO Abbreviation: Am. J. Physiol. Heart Circ. Physiol. Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2010-12-03 Completed Date: 2011-01-13 Revised Date: 2011-12-21 |
Medline Journal Info:
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Nlm Unique ID: 100901228 Medline TA: Am J Physiol Heart Circ Physiol Country: United States |
Other Details:
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Languages: eng Pagination: H1917-27 Citation Subset: IM |
Affiliation:
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Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, Ohio 44106-4970, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blood Glucose / metabolism Blotting, Western Dietary Fats / administration & dosage, blood, metabolism* Disease Models, Animal Echocardiography, Doppler Energy Metabolism* Glucose Tolerance Test Glycogen Synthase Kinase 3 / metabolism Heart Failure / diagnosis, metabolism, physiopathology* Insulin / metabolism* Insulin Resistance* Male Myocardial Contraction* Myocardium / metabolism* Phosphorylation Positron-Emission Tomography Proto-Oncogene Proteins c-akt / metabolism Rats Rats, Wistar Signal Transduction Time Factors Ventricular Function, Left* Ventricular Pressure |
| Grant Support | |
ID/Acronym/Agency:
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HL-081857/HL/NHLBI NIH HHS; T32-GM-07250/GM/NIGMS NIH HHS; U24 CA 110943/CA/NCI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Dietary Fats; 0/Insulin; EC 2.7.11.1/Proto-Oncogene Proteins c-akt; EC 2.7.11.1/glycogen synthase kinase 3 beta; EC 2.7.11.26/Glycogen Synthase Kinase 3 |
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