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大麻醇促进肠道胆固醇的吸收,由Pregnane X受体介导
Conner Brown1, Wangeci Kariuki1, Haizhen A Zhong2
1Department of Biology, University of Nebraska at Kearney, Kearney, NE, United States.
Frontiers in endocrinology
|July 3, 2024
概括
大麻醇 (CBD) 激活了Pregnane X受体 (PXR),增加了胆固醇水平和失脂症的风险. 这发生在肠道胆固醇吸收增强的过程中,突出了与CBD使用相关的潜在心血管风险.
科学领域:
- 药理学 药理学是指药理学的学科.
- 分子生物学分子生物学
- 心血管科学 心血管科学
背景情况:
- Cannabidiol (CBD) 是一种非精神活性的大麻化合物,具有治疗用途,但对副作用的担忧越来越大.
- 孕妇X受体 (PXR) 在异生菌代谢中发挥作用,并与动脉动脉和失脂性影响有关.
- 了解CBD与PXR的相互作用对于评估心血管风险至关重要,例如失脂症.
研究的目的:
- 研究CBD激活人类PXR的分子机制.
- 为了确定CBD暴露是否会增加失脂血症的风险.
- 阐明CBD在细胞信号传递和潜在心血管影响中的作用.
主要方法:
- 使用基于细胞的转染试验与人类肝脏和肠道细胞来评估CBD的PXR激活活性.
- 采用计算对接和局部定向突变发生,以确定关键的PXR-连接体相互作用.
- 给C57BL/6小鼠注射CBD,有或没有PXR抗体白醇 (RES),以评估血脂质概况和肠道胆固醇吸收.
主要成果:
- CBD在人类PXR上表现出选择性激素活性,促进了PXR与共抑制剂的分离.
- 鉴定出特定的氨基酸残留物 (Met246,Ser247,Phe251,Phe288,Trp299,Tyr306),这些残留物对于CBD的激动作用至关重要.
- 在小鼠中,CBD暴露增加了血总胆固醇,部分原因是通过调节肠道PXR调节的脂质基因并增加胆固醇吸收.
结论:
- CBD是一种选择性的PXR激动剂,激活PXR信号,导致血胆固醇水平升高.
- 提高肠道胆固醇的吸收有助于CBD诱导的脂质不良症.
- 研究结果表明,CBD对心血管疾病,特别是失脂症的潜在风险,需要进一步评估风险.
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