University of Nebraska Medical Center, Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Omaha, NE, USA; University of Nebraska Medical Center, Department of Cellular & Integrative Physiology, Omaha, NE, USA.
University of Nebraska Medical Center, Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Omaha, NE, USA.
Redox Biol. 2019 Oct;27:101146. doi: 10.1016/j.redox.2019.101146. Epub 2019 Feb 25.
Motile cilia on airway cells are necessary for clearance of mucus-trapped particles out of the lung. Ciliated airway epithelial cells are uniquely exposed to oxidants through trapping of particles, debris and pathogens in mucus and the direct exposure to inhaled oxidant gases. Dynein ATPases, the motors driving ciliary motility, are sensitive to the local redox environment within each cilium. Several redox-sensitive cilia-localized proteins modulate dynein activity and include Protein Kinase A, Protein Kinase C, and Protein Phosphatase 1. Moreover, cilia are rich in known redox regulatory proteins and thioredoxin domain-containing proteins that are critical in maintaining a balanced redox environment. Importantly, a nonsense mutation in TXNDC3, which contains a thioredoxin motif, has recently been identified as disease-causing in Primary Ciliary Dyskinesia, a hereditary motile cilia disease resulting in impaired mucociliary clearance. Here we review current understanding of the role(s) oxidant species play in modifying airway ciliary function. We focus on oxidants generated in the airways, cilia redox targets that modulate ciliary beating and imbalances in redox state that impact health and disease. Finally, we review disease models such as smoking, asthma, alcohol drinking, and infections as well as the direct application of oxidants that implicate redox balance as a modulator of cilia motility.
气道细胞上的运动纤毛对于清除肺部中被黏液困住的颗粒是必需的。纤毛气道上皮细胞通过将颗粒、碎片和病原体困在黏液中,以及直接暴露于吸入的氧化气体,而独特地暴露于氧化剂之下。驱动纤毛运动的动力蛋白 dynein ATPase 对每个纤毛内的局部氧化还原环境敏感。几种氧化还原敏感的纤毛定位蛋白调节 dynein 活性,包括蛋白激酶 A、蛋白激酶 C 和蛋白磷酸酶 1。此外,纤毛富含已知的氧化还原调节蛋白和硫氧还蛋白结构域蛋白,这些蛋白对于维持平衡的氧化还原环境至关重要。重要的是,TXNDC3 中的无意义突变最近被确定为原发性纤毛运动障碍的致病原因,这是一种遗传性运动纤毛疾病,导致黏液纤毛清除功能受损。在这里,我们回顾了目前对氧化剂在改变气道纤毛功能中的作用的理解。我们重点介绍了在气道中产生的氧化剂、调节纤毛摆动的纤毛氧化还原靶标以及影响健康和疾病的氧化还原状态失衡。最后,我们回顾了一些疾病模型,如吸烟、哮喘、饮酒和感染,以及氧化剂的直接应用,这些都表明氧化还原平衡是纤毛运动的调节剂。