确定线粒体中对ATP敏感的通道
Angela Paggio1, Vanessa Checchetto2, Antonio Campo1
1Department of Biomedical Sciences, University of Padova, Padova, Italy.
Nature
|August 23, 2019
概括
科学家们发现了一种新的线粒体蛋白质复合体,即依赖ATP的通道 (mitoKATP),对于调节细胞能量和器官功能至关重要. 这一发现影响了对线粒体生理学和疾病的理解.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 生理学 生理学 生理学
背景情况:
- 线粒体对于细胞能量生产至关重要,为细胞功能提供ATP.
- 将线粒体性能与细胞ATP水平联系在一起的机制在很大程度上仍未被定义.
- 假设ATP依赖通道 (mitoKATP) 在这种调节中起作用.
研究的目的:
- 为了确认mitoKATP蛋白质复合体的存在和功能.
- 为了识别构成mitoKATP通道的子单元.
- 阐明 mitoKATP 在线粒体生理学和细胞能量平衡中的作用.
主要方法:
- 在实验室中复制已识别的线粒体子单元 (MITOK和MITOSUR).
- 功能性测试用于评估电流和道特性.
- 在细胞模型中对MITOK进行基因操纵 (过度表达和切除).
- 评估线粒体膜潜力,器官体积和氧化酸化.
- 在小鼠模型中对药理预条件的评估.
主要成果:
- 证实了线粒体蛋白质复合体的存在,该复合体调解着依赖ATP的电流 (mitoKATP).
- 确定了MITOK作为孔形成子单元和MITOSUR作为ATP结合子单元.
- 米托克过度表达导致有机体胀;米托克消去导致线粒体不稳定性和减少氧化酸化.
- 在小鼠模型中,MITOK的丧失取消了二氧化诱导的心脏保护.
结论:
- 由MITOK和MITOSUR组成的MitoKATP通道被证实可以调节线粒体功能.
- 这些通道将细胞能量状态与细胞器体积和活性联系起来.
- 线粒体生理学中,MitoKATP通道起着至关重要的作用,可能会影响病理过程.
相关概念视频
ATP Yield
78.3K
Cellular respiration produces 30 - 32 ATP per glucose molecule. Although most of the ATP results from oxidative phosphorylation and the electron transport chain (ETC), 4 ATP are gained beforehand (2 from glycolysis and 2 from the citric acid cycle).
The ETC is embedded in the inner mitochondrial membrane and is comprised of four main protein complexes and an ATP synthase. NADH and FADH2 pass electrons to these complexes, which pump protons into the intermembrane space. This distribution of...
The ETC is embedded in the inner mitochondrial membrane and is comprised of four main protein complexes and an ATP synthase. NADH and FADH2 pass electrons to these complexes, which pump protons into the intermembrane space. This distribution of...
78.3K
Antiepileptic Drugs: Potassium Channel Activators
640
Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...
Ezogabine has gained approval as an adjunctive treatment...
640
Peroxisomes and Mitochondria
94.4K
Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.
The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within...
The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within...
94.4K
Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers
1.9K
Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of...
1.9K
Hydrolysis of ATP
81.0K
The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids.
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine...
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine...
81.0K
Regulation of Sodium and Potassium
2.0K
The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily...
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily...
2.0K


