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20(S)-原人参二醇促进CFTR氯离子通道开放

刘军1,2, 那万里3, 辛伟红3, 刘丽丹4, 于波1, 麻彤辉1, 杨红1   

    1. 东北师范大学膜通道研究实验室, 长春 130024;
    2. 吉林大学第二临床医院, 长春 130041;
    3. 吉林大学中日联谊医院, 长春 130031;
    4. 吉林大学护理学院, 长春 130021
  • 收稿日期:2007-06-11 修回日期:1900-01-01 出版日期:2008-04-10 发布日期:2008-04-10
  • 通讯作者: 杨红

Natural Compound 20(S)-Protopanaxadiol Activates Cystic Fibrosis Transmembrane Conductance Regulator Chloride Channel

LIU Jun1,2, NA Wan-Li3, XIN Wei-Hong3, LIU Li-Dan4, YU Bo1, MA Tong-Hui1, YANG Hong1*   

    1. Membrane Channel Research Laboratory, Northest Normal University, Changchun 130024, China;
    2. The Second Affiliated Hospital, Jilin Uniniversity, Changchun 130041, China;
    3. Sino-Japanese Union Hospital, Jilin University, Changchun 130031, China;
    4. Nursing College, Jilin Uniniversity, Changchun 130021, China
  • Received:2007-06-11 Revised:1900-01-01 Online:2008-04-10 Published:2008-04-10
  • Contact: YANG Hong

摘要: 利用氯离子通道细胞荧光测定模型对386种中药单体化合物进行筛选, 发现20(S)-原人参二醇对依赖于cAMP的CFTR氯离子通道具有激活作用. 20(S)-原人参二醇能够以剂量依赖的方式激活野生型CFTR氯离子通道, 其激活作用通过更为可靠的氯离子通道短路电流测定系统得到证实. 20(S)-原人参二醇对CFTR氯离子通道的激活效应具有作用迅速且可逆的特点. 其在发挥激活作用时依赖于腺苷环化酶激动剂Forskolin的存在, 单独与细胞孵育不提高细胞内cAMP的水平, 表明对CFTR氯离子通道的激活作用是通过与CFTR直接结合实现的. 该化合物对ΔF508-CFTR突变氯离子通道的开放也具有特征相似的激活作用.

关键词: 囊性纤维化, CFTR氯离子通道, 突变, 天然化合物, 激活剂

Abstract: In the present study, we identified a natural compound 20(S)-protopanaxadiol as an effective CFTR chloride channel activator by screening of 386 single compounds from Chinese medicinal herbs by cell-based fluorescent assay. The CFTR-stimulating activity was confirmed by an Ussing chamber short-circuit current assay. The activation is rapid, reversible and cAMP-dependent. The compound does not elevate cellular cAMP level, implying that it worked in a direct binding way. 20(S)-Protopanaxadiol can also restore the impaired chloride conductance of ΔF508 mutant CFTR. In our study a new natural compound was identified that may be useful for probing CFTR channel gating mechanisms and as a leading compound to develop pharmacological therapy of CFTR-related disease such as cystic fibrosis, idiopathic chronic pancreatitis, keratoconjunctivitis sicca and habitual constipation.

Key words: Cystic fibrosis, CFTR chloride channel, Mutation, Natural products, Activator

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