胆红素是核受体的新配体 肝脏受体Homolog-1
bioRxiv : the preprint server for biology
|June 10, 2024
概括
血红素是一种血红素代谢产物,直接结合肝受体同源-1 (LRH-1),影响其功能. 这项研究揭示了LRH-1的存在.
科学领域:
- 肝病学 肝病学是一种肝病学.
- 分子内分泌学分子内分泌学
- 核受体 核受体 核受体
背景情况:
- 肝受体同质-1 (LRH-1,NR5A2) 是肝功能至关重要的核受体,已知与脂相互作用.
- 最近的一项查确定了血红素,一种血红素分解产物,作为潜在的LRH-1配体.
研究的目的:
- 调查 bilirubin 和 LRH-1 之间的直接相互作用.
- 阐明胆红素与LRH-1结合的功能后果.
- 探索LRH-1在感知胆红素水平中的潜在新型作用.
主要方法:
- 胆红素结合测试以确定亲和力 (明显Kd).
- 蛋白酶敏感性测定和分子动力学 (MD) 模拟以评估结合部位.
- 路西法酶记者对HepG2细胞进行了测定,包括对SLCO1B1载体和LRH-1突变物的实验.
- 基因表达概况 (RNA-seq) 和染色体免疫沉测序 (ChIP-seq) 分析.
- LRH-1的淘汰和化学竞争对手研究.
主要成果:
- 非结合性胆红素直接与LRH-1结合,其表面Kd为9.3 uM.
- 胆红素结合改变了LRH-1与转录核心调节器的相互作用,并降低了其蛋白酶敏感性.
- 胆红素激活了依赖于SLCO1B1的SLCO1B1表达和功能性LRH-1联体结合域的LRH-1-依赖转录.
- 基因分析显示,胆红素有选择性地调节内源性LRH-1基因,这些基因参与胆固醇代谢和脂质排放.
结论:
- 胆红素是LRH-1的直接连接体.
- LRH-1 在感知细胞内胆固醇水平方面发挥作用.
- LRH-1和胆红素在胆固醇和脂质代谢中共享调节作用,这表明一种新的生理联系.
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