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- Söz konusu modelde Saponin permeabilize Kardiyak Elyaf Oksidatif Fosforilasyon Değerlendirmesi
- Bilinçli Rat hiperinsülinemik öglisemik Kelepçe
Other Publications (2)
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Articles by Curtis C. Hughey in JoVE
JoVE General
Söz konusu modelde Saponin permeabilize Kardiyak Elyaf Oksidatif Fosforilasyon Değerlendirmesi
1Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Calgary, 2Faculty of Kinesiology, University of Calgary
Söz konusu modelde oksidatif fosforilasyon analizi ile birlikte Saponin-permeabilize elyaf hazırlama, mitokondriyal fonksiyon bütünleştirici değerlendirme sağlar. Mitokondriyal solunum fizyolojik ve patolojik durumlar mitokondriyal etkileşimleri, morfolojisi ve biyokimya da dahil olmak üzere çeşitli düzenleyici etkileri yansıtabilir.
JoVE Clinical and Translational Medicine
Bilinçli Rat hiperinsülinemik öglisemik Kelepçe
1Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Calgary, 2Faculty of Kinesiology, University of Calgary
Hiperinsülinemik öglisemik kelepçe insülin eylem değerlendirmesi için "altın standart". İnsülin, glukoz alımını teşvik sabit bir hızla doluyor. Bu düşüşün karşı aşılanmış eksojen glukoz miktarı insülin duyarlılığını göstermektedir. İşte prosedür bilinçli bir dizginlenmemiş sıçan yapılır.
Other articles by Curtis C. Hughey on PubMed
Exercise Training Does Not Correct Abnormal Cardiac Glycogen Accumulation in the Db/db Mouse Model of Type 2 Diabetes
Substrate imbalance is a well-recognized feature of diabetic cardiomyopathy. Insulin resistance effectively limits carbohydrate oxidation, resulting in abnormal cardiac glycogen accumulation. Aims of the present study were to 1) characterize the role of glycogen-associated proteins involved in excessive glycogen accumulation in type 2 diabetic hearts and 2) determine if exercise training can attenuate abnormal cardiac glycogen accumulation. Control (db(+)) and genetically diabetic (db/db) C57BL/KsJ-lepr(db)/lepr(db) mice were subjected to sedentary or treadmill exercise regimens. Exercise training consisted of high-intensity/short-duration (10 days) and low-intensity/long-duration (6 wk) protocols. Glycogen levels were elevated by 35-50% in db/db hearts. Exercise training further increased (2- to 3-fold) glycogen levels in db/db hearts. Analysis of soluble and insoluble glycogen pools revealed no differential accumulation of one glycogen subspecies. Phosphorylation (Ser(640)) of glycogen synthase, an indicator of enzymatic fractional activity, was greater in db/db mice subjected to sedentary and exercise regimens. Elevated glycogen levels were accompanied by decreased phosphorylation (Thr(172)) of 5'-AMP-activated kinase and phosphorylation (Ser(79)) of its downstream substrate acetyl-CoA carboxylase. Glycogen concentration was not associated with increases in other glycogen-associated proteins, including malin and laforin. Novel observations show that exercise training does not correct diabetes-induced elevations in cardiac glycogen but, rather, precipitates further accumulation.
Mesenchymal Stem Cell Transplantation for the Infarcted Heart: a Role in Minimizing Abnormalities in Cardiac-specific Energy Metabolism
Intense interest has been focused on cell-based therapy for the infarcted heart given that stem cells have exhibited the ability to reduce infarct size and mitigate cardiac dysfunction. Despite this, it is unknown whether mesenchymal stem cell (MSC) therapy can prevent metabolic remodeling following a myocardial infarction (MI). This study examines the ability of MSCs to rescue the infarcted heart from perturbed substrate uptake in vivo. C57BL/6 mice underwent chronic ligation of the left anterior descending coronary artery to induce a MI. Echocardiography was performed on conscious mice at baseline as well as 7 and 23 days post-MI. Twenty-eight days following the ligation procedure, hyperinsulinemic euglycemic clamps assessed in vivo insulin sensitivity. Isotopic tracer administration evaluated whole body, peripheral tissue, and cardiac-specific glucose and fatty acid utilization. To gain insight into the mechanisms by which MSCs modulate metabolism, mitochondrial function was assessed by high-resolution respirometry using permeabilized cardiac fibers. Data show that MSC transplantation preserves insulin-stimulated fatty acid uptake in the peri-infarct region (4.25 ± 0.64 vs. 2.57 ± 0.34 vs. 3.89 ± 0.54 μmol·100 g(-1)·min(-1), SHAM vs. MI + PBS vs. MI + MSC; P < 0.05) and prevents increases in glucose uptake in the remote left ventricle (3.11 ± 0.43 vs. 3.81 ± 0.79 vs. 6.36 ± 1.08 μmol·100 g(-1)·min(-1), SHAM vs. MI + PBS vs. MI + MSC; P < 0.05). This was associated with an enhanced efficiency of mitochondrial oxidative phosphorylation with a respiratory control ratio of 3.36 ± 0.18 in MSC-treated cardiac fibers vs. 2.57 ± 0.14 in the infarct-only fibers (P < 0.05). In conclusion, MSC therapy exhibits the potential to rescue the heart from metabolic aberrations following a MI. Restoration of metabolic flexibility is important given the metabolic demands of the heart and the role of energetics in the progression to heart failure.
