瑞克是一种GPNMB受体,驱动MASH
Yue Xi1,2, Waner Zeng1,2, Jie Luo1,2
1State Key Laboratory of Metabolism and Regulation in Complex Organisms, College of Life Sciences, Wuhan University, Wuhan, China.
Nature
|February 18, 2026
概括
代谢功能障碍相关的胆固醇肝炎 (MASH) 的进展是由糖蛋白非转移性黑色素瘤蛋白B (GPNMB) ectodomain (G-ECD) 结合受体氨酸激酶 (RYK) 驱动的. 针对这个GPNMB-RYK轴为MASH提供了一个有前途的治疗策略.
科学领域:
- 肝病学 肝病学是一种肝病学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 与代谢功能障碍相关的脂肪肝炎 (MASH) 的患病率在全球范围内不断增加,有效的治疗选择有限.
- 在受MASH保护的小鼠中,糖蛋白非转移性黑色素瘤蛋白B (GPNMB) 的上调.
研究的目的:
- 调查GPNMB在MASH病变发生中的作用.
- 确定GPNMB外域 (G-ECD) 的受体,并阐明底层的分子机制.
- 探索针对MASH治疗的GPNMB-RYK轴的治疗策略.
主要方法:
- 在饮食诱导的MASH小鼠模型中,系统性或肝细胞特异性的Gpnmb消化.
- 使用细胞表面显示的跨膜蛋白库识别G-ECD受体.
- 肝细胞特异性瑞克切除和MASH进展的评估.
- 对下游信号通路的分析,包括ERK1/2,PPARγ-CD36和SREBP1C.
- 针对GPNMB-RYK轴的治疗干预措施的评估.
主要成果:
- 保护GPNMB消去免受饮食诱导的MASH.
- MASH的进展是由分泌的GPNMB外域 (G-ECD) 驱动的,而不是全长的GPNMB.
- 人类患者的血清G-ECD水平与MASH严重程度正相关.
- 受体氨酸激酶 (RYK) 被确定为G-ECD.的功能受体.
- 肝细胞特异性Ryk切除改善了MASH,并阻止了G-ECD的致病作用.
- G-ECD/RYK相互作用激活了ERK1/2信号,通过PPARγ-CD36和SREBP1C促进肝脏脂质的吸收和脂质生成.
- 针对GPNMB-RYK轴的治疗策略在临床前MASH模型中显示出有效性.
结论:
- GPNMB-RYK轴代表了一种涉及MASH病变的新联体受体通路.
- 针对GPNMB-RYK轴是一个有前途的治疗策略来治疗MASH.
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