延迟关联核抗原 (LANA) 通过抑制Nrf2/GPX4和UpregulatingMDM2促进铁
Yuejia Cao1,2, Shihan Shao1, Yingying Zhang1
1School of Public Health, Hangzhou Normal University, Hangzhou 311121, China.
Pathogens (Basel, Switzerland)
|June 25, 2025
概括
卡波西的肉瘤相关性疹病毒 (KSHV) 与潜伏相关的核抗原 (LANA) 意外地促进了ferroptosis. 拉纳抑制了谷氨过氧化酶4 (GPX4) 和核因素红色素2相关因子2 (Nrf2),导致细胞死亡增加.
科学领域:
- 细胞生物学 细胞生物学
- 病毒学 病毒学
- 癌症研究 癌症研究
背景情况:
- 铁亡是一种依赖于铁的细胞死亡途径,由GPX4和Nrf2.2调节.
- 卡波西的肉瘤相关性疹病毒 (KSHV) 延迟相关核抗原 (LANA) 对于病毒的持续性至关重要.
- 以前的研究表明,KSHV感染会对铁亡产生抗性,但LANA的具体作用尚不清楚.
研究的目的:
- 调查LANA在调节铁亡中的作用.
- 阐明LANA影响铁亡的分子机制.
主要方法:
- 使用了KSHV阳性的iSLK.219细胞和HeLa细胞.
- 进行了LANA敲击和过度表达.
- 使用RSL-3诱导了铁性.
- 量化了ROS积累,GPX4,Nrf2和MDM2的表达水平.
- 使用了药理抑制剂ML385 (Nrf2抑制剂) 和nutlin3a (MDM2抑制剂).
主要成果:
- 拉纳敲除减弱的RSL-3诱导的铁死.
- 拉纳的过度表达使细胞对铁亡产生敏感.
- LANA 枯竭增加了 ROS 积累,而过度表达则减少了它.
- 拉纳抑制了GPX4和Nrf2的表达和核转位.
- 拉纳上调调节了MDM2表达式.
- 抑制Nrf2或MDM2可以逆转LANA对铁亡的作用.
结论:
- 兰娜意外地促进了铁亡.
- 通过抑制Nrf2/GPX4通路并激活MDM2.2,LANA发挥了其亲铁菌作用.
- 这些发现揭示了LANA在KSHV感染期间调节细胞死亡途径方面的新作用.
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