在临床前的SUDEP模型中,对超 - 缺氧挑战的改变呼吸系统反应涉及素神经元
Shruthi H Iyer1, Jillian E Hinman1, Ted Warren1
1Department of Pharmacology and Neuroscience, Creighton University School of Medicine, Omaha, NE 68178, USA.
Neurobiology of disease
|July 6, 2024
概括
缺乏Kcna1的小鼠,这是中突然意外死亡 (SUDEP) 的模型,在超 - 缺氧挑战期间显示出异常呼吸. 素系统功能障碍和素神经元敏感性增加有助于这些有害的呼吸反应.
科学领域:
- 神经科学是一个神经科学.
- 呼吸系统生理学 呼吸系统生理学
- 的研究研究.
背景情况:
- 的突然意外死亡 (SUDEP) 可能涉及从高头和低氧化 (HH) 的呼吸功能障碍.
- 氧系统功能障碍与Kcna1-/小鼠的呼吸系统异常有关,这是一个临床前的SUDEP模型.
研究的目的:
- 为了研究Kcna1-/小鼠对重复超-低氧 (HH) 挑战的呼吸系统反应.
- 为了确定素系统在这个SUDEP模型中观察到的呼吸系统异常中的作用.
主要方法:
- 整体囊造影用于评估Kcna1-/和野生类型 (WT) 老鼠在轻度和重度重复的HH挑战期间的呼吸反应.
- 评估了双素受体对抗剂对呼吸器反应的影响.
- 在脑切片中的ex vivo细胞外记录测量了素神经元的化学敏感性.
主要成果:
- 与WT小鼠相比,Kcna1-/小鼠对轻度的HH挑战表现出过度的通风反应.
- 显著的大多数 (71%) 的Kcna1-/小鼠没有在严重的HH挑战中存活下来,而所有WT小鼠都恢复了.
- 素受体对抗剂治疗在轻度HH期间使Kcna1-/小鼠的呼吸系统反应正常化,在严重的HH期间改善了生存率.
- 与WT小鼠相比,Kcna1-/小鼠中的奥雷克辛神经元表现出增加的刺激和增强的化学敏感性.
结论:
- 素神经元的化学敏感活性增加,有助于SUDEP的Kcna1-/小鼠模型中的病态呼吸反应.
- 这些发现表明,患SUDEP高风险的个体可能对HH挑战具有更高的敏感性,从而影响生存概率.
相关概念视频
Hyperpnea and Hyperventilation
1.0K
Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
1.0K
Chemical Factors Affecting Respiration Centers
1.1K
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....
CO2 has a potent influence on respiration and is strictly regulated....
1.1K
Physiological Control of Respiration
2.0K
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...
2.0K
Acute Respiratory Failure-III
170
Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without...
170
Alterations in Respiration II
846
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...
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes...
846


