内科学
β氧化
酮体
心力衰竭
内分泌学
脂肪酸
射血分数
医学
糖酵解
心脏病学
射血分数保留的心力衰竭
心功能曲线
化学
生物化学
新陈代谢
作者
Qiuyu Sun,Berna Güven,Cory S. Wagg,Amanda Almeida de Oliveira,Heidi Silver,Liyan Zhang,Brandon Chen,Ke Wei,Ezra Belay Ketema,Qutuba G. Karwi,Kaya L. Persad,Jennie Vu,Faqi Wang,Jason R.B. Dyck,Gavin Y. Oudit,Gary D. Lopaschuk
出处
期刊:Cardiovascular Research
[Oxford University Press]
日期:2024-01-09
卷期号:120 (4): 360-371
被引量:2
摘要
Abstract Aims Heart failure with preserved ejection fraction (HFpEF) is a prevalent disease worldwide. While it is well established that alterations of cardiac energy metabolism contribute to cardiovascular pathology, the precise source of fuel used by the heart in HFpEF remains unclear. The objective of this study was to define the energy metabolic profile of the heart in HFpEF. Methods and results Eight-week-old C57BL/6 male mice were subjected to a ‘2-Hit’ HFpEF protocol [60% high-fat diet (HFD) + 0.5 g/L of Nω-nitro-L-arginine methyl ester]. Echocardiography and pressure–volume loop analysis were used for assessing cardiac function and cardiac haemodynamics, respectively. Isolated working hearts were perfused with radiolabelled energy substrates to directly measure rates of fatty acid oxidation, glucose oxidation, ketone oxidation, and glycolysis. HFpEF mice exhibited increased body weight, glucose intolerance, elevated blood pressure, diastolic dysfunction, and cardiac hypertrophy. In HFpEF hearts, insulin stimulation of glucose oxidation was significantly suppressed. This was paralleled by an increase in fatty acid oxidation rates, while cardiac ketone oxidation and glycolysis rates were comparable with healthy control hearts. The balance between glucose and fatty acid oxidation contributing to overall adenosine triphosphate (ATP) production was disrupted, where HFpEF hearts were more reliant on fatty acid as the major source of fuel for ATP production, compensating for the decrease of ATP originating from glucose oxidation. Additionally, phosphorylated pyruvate dehydrogenase levels decreased in both HFpEF mice and human patient’s heart samples. Conclusion In HFpEF, fatty acid oxidation dominates as the major source of cardiac ATP production at the expense of insulin-stimulated glucose oxidation.
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