在小鼠中,基体支持的呼吸被阿尔法-谷氨酸增强,并通过神经元SCOT表达得到优化
Xin C Davis1,2, Colin S McCoin1,2,3,4, E Matthew Morris1,2,4
1Department of Cell Biology & Physiology, University of Kansas Medical Center, Kansas City, Kansas, United States.
American journal of physiology. Endocrinology and metabolism
|April 17, 2025
概括
体为大脑提供一种替代燃料. 这项研究发现,α-谷氨酸增强了大脑线粒体中的呼吸,尽管神经元特异性的SCOT删除影响了乙-CoA,但不是能量负荷.
科学领域:
- 神经科学是一个神经科学.
- 线粒体的新陈代谢
- 生物化学 生物化学
背景情况:
- 神经退行性疾病与降低葡萄糖利用率有关.
- 体被探索为替代的大脑燃料来源.
- 顺-CoA-3-oxoacid-CoA转移酶 (SCOT) 在体氧化过程中至关重要.
研究的目的:
- 建立一个协议,以最大限度地提高隔离的大脑线粒体中的体呼吸.
- 量化控制中的乙-CoA和能量负荷与神经元特定的SCOT-Knockout小鼠.
- 研究alpha-ketoglutarate (αKG) 在代谢中的作用.
主要方法:
- 从对照和SCOT淘汰赛小鼠中分离的大脑线粒体的准备.
- 测量乙乙酸盐 (AcAc) 的呼吸速率.
- 使用液体染色学-并联质谱法量化乙-CoA和能量电荷.
- 使用了ADP依赖的呼吸试验和αKG补充剂.
主要成果:
- 最大ADP依赖的AcAc呼吸发生在1mM时,在基数以上的最小增加.
- 阿尔法谷酸盐 (αKG) 在孤立的大脑线粒体中显著增强了依赖AcAc的呼吸.
- 在SCOT淘汰赛中,小鼠表现出较低的AcAc状态3呼吸.
- 尽管降低了乙-CoA,但在SCOT-Knockout小鼠中没有观察到线粒体能量充电的差异.
结论:
- αKG在隔离的大脑线粒体中增强了基支持的呼吸.
- 神经元SCOT删除会影响大脑线粒体的乙-CoA水平,但不会影响能量充电.
- 需要进一步的研究来探索影响子支持呼吸和大脑健康的因素.
相关概念视频
Physiological Control of Respiration
Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Mechanism of Breathing III: The Accessory Muscles
The Role of Accessory Muscles in the Respiratory System
The respiratory system is a complex network that relies on primary respiratory muscles like the diaphragm, but also involves accessory muscles to enhance lung expansion and airflow during both inhalation and exhalation.
Enhancing Inhalation with Accessory Muscles:
Accessory muscles such as the sternocleidomastoid, scalene, intercostal, and abdominal muscles are crucial when additional respiratory effort is required, such as during deep...
The respiratory system is a complex network that relies on primary respiratory muscles like the diaphragm, but also involves accessory muscles to enhance lung expansion and airflow during both inhalation and exhalation.
Enhancing Inhalation with Accessory Muscles:
Accessory muscles such as the sternocleidomastoid, scalene, intercostal, and abdominal muscles are crucial when additional respiratory effort is required, such as during deep...
Alterations in Respiration II
There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
Neural Control of Respiration
The neural regulation of respiration is a meticulously coordinated process primarily controlled by the respiratory centers located within the brainstem. These centers, composed of specialized neurons, transmit nerve impulses that control the contraction and relaxation of our respiratory muscles.
Respiratory Centers in the Brainstem
Two primary areas comprise the respiratory center: the medullary respiratory center in the medulla oblongata and the pontine respiratory group in the pons. The...
Respiratory Centers in the Brainstem
Two primary areas comprise the respiratory center: the medullary respiratory center in the medulla oblongata and the pontine respiratory group in the pons. The...
Chemical Factors Affecting Respiration Centers
Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated. Under...
CO2 has a potent influence on respiration and is strictly regulated. Under...
Physiology of Respiration II: Neurogenic Control of Respiration
The neurogenic control of respiration coordinates various neural networks and pathways to regulate breathing rate and depth, meeting the body's oxygen and carbon dioxide exchange requirements. This system adapts to physiological and environmental conditions, ensuring optimal breathing patterns.
Central Control
The brainstem is the primary site of central control, hosting respiratory centers:
Central Control
The brainstem is the primary site of central control, hosting respiratory centers:


