增强葡萄糖分解对心脏衰老的影响
Anna Faakye1,2, Kylene M Harold1,2, Satoshi Matsuzaki1
1Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, 825 N.E. 13 th Street, Oklahoma City, OK, USA.
GeroScience
|May 1, 2025
概括
增强的心脏糖解不会加速老化在小鼠. 年龄较大的GlycoHi小鼠表现出代谢适应,而不是功能障碍,这表明了针对心脏衰老的干预措施的潜在目标.
科学领域:
- 心血管生物学 心血管生物学
- 代谢生理学 代谢生理学
- 衰老研究研究 衰老研究
背景情况:
- 心脏衰老涉及代谢变化,特别是糖分分解的增加,增加心血管疾病的风险.
- 格莱科Hi小鼠模型表现出构成性高心脏糖解,为研究衰老提供了一种独特的工具.
研究的目的:
- 调查增强心脏糖解对与衰老相关的心脏功能和新陈代谢的影响.
- 为了比较老年GlycoHi小鼠与野生类型 (WT) 两性对照,检查心脏功能,新陈代谢,线粒体性能和衰老特征.
主要方法:
- 对老年 (21-24个月) GlycoHi和WT小鼠 (雄性和雌性) 的比较分析.
- 评估心脏功能,全身新陈代谢,线粒体生物能学和氧化应激.
- 蛋白质组,代谢组和组织学分析以评估分子和结构变化.
主要成果:
- 老年GlycoHi小鼠表现出适度的心脏功能减少,心脏大小和原的性别特异性差异.
- 女性的糖糖Hi心脏显示高;男性的原蛋白水平升高. 整个身体的新陈代谢是相似的,女性显示较少的昼夜变化.
- 线粒体功能保持稳健,没有显著的生物能功能障碍或氧化应激;老化正常化了pyruvate脱酶活性.
结论:
- 仅仅心脏糖解升高并不能加速心脏衰老或诱导显著的功能障碍.
- 老年心脏的代谢和功能变化代表了适应性反应,而不是病理性衰老.
- 研究结果为缓解与年龄相关的心脏衰退的代谢目标提供了洞察力.
相关概念视频
00:56What is Glycolysis?
162.3K
Overview
Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...
Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...
162.3K
01:29Pathophysiology of Cardiac Performance
471
Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
471
01:37Mitochondria
8.9K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
8.9K
01:13Outcomes of Glycolysis
98.1K
Nearly all the energy used by cells comes from the bonds that make up complex organic compounds. These organic compounds are broken down into simpler molecules, such as glucose. As a result, cells extract energy from glucose over many chemical reactions—a process called cellular respiration.
Cellular respiration can occur aerobically (with oxygen) or anaerobically (without oxygen). In the presence of oxygen, cellular respiration starts with glycolysis and continues with pyruvate...
Cellular respiration can occur aerobically (with oxygen) or anaerobically (without oxygen). In the presence of oxygen, cellular respiration starts with glycolysis and continues with pyruvate...
98.1K
01:17Pathophysiology of Heart Failure
1.4K
Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
1.4K
01:20Fates of Pyruvate
8.0K
Pyruvate is the end product of glycolysis, where glucose is oxidized to pyruvate, simultaneously reducing NAD+ to NADH. Two molecules of ATP are also produced by substrate-level phosphorylation.
In aerobic organisms, pyruvate is metabolized via the citric acid cycle to produce reduced coenzymes NADH and FADH2. These coenzymes are then oxidized in the electron transport chain to produce ATP and, in the process, regenerate the NAD+ and FAD. As seen in some cell types and organisms, fermentation...
In aerobic organisms, pyruvate is metabolized via the citric acid cycle to produce reduced coenzymes NADH and FADH2. These coenzymes are then oxidized in the electron transport chain to produce ATP and, in the process, regenerate the NAD+ and FAD. As seen in some cell types and organisms, fermentation...
8.0K