小分子离子通道增强囊性纤维化呼吸道上皮质的宿主防御
Katrina A Muraglia1, Rajeev S Chorghade2, Bo Ram Kim3
1Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
Nature
|March 15, 2019
概括
通过创建离子通道,改善pH和独立于CFTR突变的功能来恢复气道防御. 这为囊性纤维化患者提供了潜在的新治疗策略.
科学领域:
- 细胞生物学
- 呼吸系统医学
- 药理学
背景情况:
- 囊性纤维化转膜导电调节器 (CFTR) 的功能丧失突变损害了上皮离子传输,导致呼吸道表面液体的pH值降低,并损害了囊性纤维化患者的呼吸系统防御能力.
- 目前的治疗常常针对CFTR,但许多突变不能产生功能蛋白质,因此需要替代治疗方法.
研究的目的:
- 探究形成非选择性离子通道的小分子二能否恢复囊性纤维化呼吸道上皮质的上皮功能和宿主防御.
- 要确定这种治疗效果是否取决于CFTR的存在或功能.
主要方法:
- 来自囊性纤维化患者的培养呼吸道上皮质被用角氨基酸B治疗.
- 评估了基侧Na+,K+-ATPase活性,以了解离子运输恢复的机制.
- 使用CFTR-null猪进行了体内研究,以评估安福特里辛B对气道表面液体pH的影响.
主要成果:
- 在囊性纤维化呼吸道上皮质中恢复了HCO3-分泌和增加了呼吸道表面液体pH.
- 这些效应取决于基底侧Na+,K+- ATPase活性,这表明与内源离子运输的功能整合.
- 在 CFTR- null 猪中,安福特里辛B还改善了呼吸道表面液体粘度和抗菌活性,并增加了呼吸道表面液体的pH值.
结论:
- 不选择性小分子离子通道,如安二B,可以恢复囊性纤维化呼吸道上皮质的宿主防御.
- 这种治疗机制独立于CFTR功能和基因型,为所有患有囊性纤维化的人提供潜在的治疗策略.
- 氨基氨酸B是恢复气道表面液体平衡和改善囊性纤维化病的有希望的治疗候选药物.
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