基于胆汁酸的新型FXR调节器的结构基础
D Kydd-Sinclair1, G L Packer2, A C Weymouth-Wilson3
1School of Biological Sciences, Health and Life Sciences Building, Whiteknights Campus, University of Reading, Reading, Berkshire RG6 6EX, UK.
Journal of molecular biology
|August 13, 2025
概括
两种新型胆酸衍生物显示出强有力的和选择性的Farnesoid X受体 (FXR) 激活,为肝脏疾病的基因特异性调节提供了潜力,并克服了当前药物的局限性.
科学领域:
- 肝病学和药理学 肝病学和药理学
- 分子生物学和生物化学 分子生物学和生物化学
- 药物发现和开发 药物发现和开发
背景情况:
- 法内索伊德X受体 (FXR) 调节关键的代谢和炎症途径,与肝脏疾病有关.
- 目前的FXR激应剂,如obeticholic acid,由于系统激活和不良影响而面临挑战.
- 选择性调节FXR信号对于开发更安全,更有效的治疗方法至关重要.
研究的目的:
- 验证和描述两种新的胆酸衍生物作为选择性FXR激动剂.
- 为了研究它们的结合模式,协活性剂的招募,以及下游信号效应,在体外和体内.
- 评估它们克服现有的FXR向药物的局限性的潜力.
主要方法:
- 用X射线晶体学来确定FXR联体结合域 (LBD) 与新型化合物的共晶结构.
- LanthaScreen 协同激活剂招募试验,以评估依赖联体的激活.
- 在体外研究使用肝细胞癌细胞来分析基因表达变化 (RNA测序,RT-qPCR).
- 在C57BL/6小鼠体内研究,以评估化合物对FXR信号通路的影响.
主要成果:
- 新型化合物表现出强大和选择性的FXR激活剂活性,其强度超过了奥贝西可尔酸.
- 观察到不同的结合模式,包括通过受体子口袋的全激活.
- 与obeticholic acid相比,这些化合物在较低剂量下诱导了更大的FXR基因表达变化.
- 在体内观察到不同的基因表达模式,这表明化合物特定的调节效应.
结论:
- 新型胆汁酸衍生物具有独特的结合和激活特性,可实现基因特异性FXR调节.
- 这些化合物有望通过克服系统性FXR激活的不良影响来开发改善肝脏疾病的治疗方法.
- 需要进一步的研究来探索它们的全部治疗潜力.
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