在人类呼吸道平滑肌细胞中以细胞为基础测量线粒体功能
Sanjana Mahadev Bhat1, Jane Q Yap1, Oscar A Ramirez-Ramirez1
1Department of Physiology & Biomedical Engineering, Mayo Clinic, Rochester, MN 55905, USA.
International journal of molecular sciences
|July 29, 2023
概括
研究人员开发了一种新的方法来测量人类个体呼吸道光滑肌肉细胞中的线粒体功能. 这种技术量化了酸脱酶 (SDH) 酶活性,为细胞呼吸提供了精确的见解.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 线粒体生理学线粒体生理学
背景情况:
- 高分辨率呼吸计通过氧气消耗率 (OCR) 评估细胞线粒体功能.
- 线粒体酶活性的直接测量提供了更深入的生理洞察力.
- 酸脱酶 (SDH) 是三碳酸 (TCA) 循环和电子运输链 (ETC) 中的关键酶,作为复合II.
研究的目的:
- 建立一种定量体化学技术,用于测量人类呼吸道光滑肌肉 (hASM) 单个细胞中的SDH活性.
- 为了确定hASM细胞中SDH反应的最大速度 (SDHmax).
- 为了验证该技术的严谨性,可重现性和可靠性,以评估细胞水平上的线粒体功能.
主要方法:
- 使用定量体化学方法测量单个hASM细胞中的SDHmax.
- 暴露在hASM细胞中的苏酸盐 (80 mM) 和酸蓝 (NBT) (1.5 mM).
- 使用共聚焦显微镜测量了NBT减小到二形,并在570nm时测量了光密度 (OD),并控制了光斑长度.
主要成果:
- 在单个hASM细胞中成功确定SDHmax.
- 表示SDHmax为mmol烟酸/升细胞/分钟.
- 证明了该技术能够精确测量线粒体酶动力学的能力.
结论:
- 开发的定量组织化学技术是严格的,可重复的,可靠的.
- 这种方法提供了有价值的,直接测量线粒体功能在单个细胞.
- 该技术为细胞呼吸和SDH活动提供了重要的生理洞察力.
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