烟雾度的组织特异性线粒体毒性:氧化酸化的后果
Stephen T Decker1, Alexs A Matias1, Adolfo E Cuadra2
1Department of Kinesiology, University of Massachusetts Amherst, Amherst, Massachusetts, United States.
American journal of physiology. Heart and circulatory physiology
|September 15, 2023
概括
香烟烟雾缩物 (CSC) 损害心脏和骨肌肉中的线粒体呼吸,但不影响主动脉,因为线粒体含量各不相同. 这揭示了影响心脏代谢健康的组织特异性毒性机制.
科学领域:
- 线粒体生物学 线粒体生物学
- 毒理学 毒理学 毒理学
- 心血管科学 心血管科学
- 肺部医学 肺部医学
背景情况:
- 香烟烟雾是已知的慢性疾病的风险因素,包括肺部和心脏代谢疾病.
- 在肺外组织中,香烟烟雾毒性的细胞机制尚不清楚.
- 线粒体功能障碍与吸烟相关的疾病有关.
研究的目的:
- 描述香烟烟雾缩物 (CSC) 对线粒体新陈代谢的急性剂量依赖毒性.
- 确定小鼠骨肌,心肌和大动脉中线粒体呼吸对CSC的易感性和敏感性.
- 为了阐明在线粒体水平上暴露于香烟烟雾的特定组织反应.
主要方法:
- 使用高分辨率呼吸计测量了在透的小鼠组织 (胃膜,单体,心脏,大动脉) 中的线粒体呼吸能力.
- 产生剂量反应曲线以评估CSC对组织特异性呼吸的抑制作用.
- 测量了酸盐合成酶活性,以使线粒体含量的呼吸数据正常化.
主要成果:
- 在所有测试组织中,CSC以双相的方式抑制了线粒体呼吸.
- 大动脉对CSC表现出最少的易受性和敏感性,这表明线粒体内在的抗性.
- 心脏肌肉是最易受和最敏感的,但线粒体含量正常化显示,心脏肌肉和骨肌肉具有类似的敏感性.
- 组织特异性的线粒体含量会影响纹肌肉中CSC毒性的程度.
结论:
- 香烟烟雾对肺外组织中的线粒体氧化酸化产生急性,剂量依赖的毒性.
- 大动脉具有对香烟烟雾引起的线粒体毒性的内在保护.
- 线粒体含量在确定心脏和骨肌肉对香烟烟雾毒性的敏感性方面发挥着至关重要的作用,影响心脏代谢疾病的发展.
更多相关视频
10:47Isolation of Mouse Respiratory Epithelial Cells and Exposure to Experimental Cigarette Smoke at Air Liquid Interface
Published on: February 21, 2011
34.2K
06:53Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase COX/SDH Double-labeling Histochemistry
Published on: November 23, 2011
36.8K
相关概念视频
Electron Transport Chain: Complex I and II
14.4K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
14.4K
The Electron Transport Chain
16.9K
The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
16.9K
Mitochondria
13.7K
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,...
13.7K
