在ATO中的LncRNA MALAT1/Calpain-1轴诱导的hERG通道缺陷
Caichuan Yan1, Yuexin Li1, Xiaoxu Li1
1Department of Pharmacology, College of Pharmacy, Harbin Medical University, Harbin, People's Republic of China.
三氧化物 (ATO) 通过增加MALAT1,激活calpain-1并减少hERG通道,导致心脏毒性. 坦辛IIA和fexofenadine可以抵消这种作用,为获得的长QT综合征 (acLQTS) 提供潜在的治疗方法.
科学领域:
- 心血管药理学心血管药理学
- 分子生物学分子生物学
- 在瘤学瘤学.
背景情况:
- KCNH2 (与人类以太相关的基因) 编码了hERG通道,对心脏再极化至关重要.
- 获得的长QT综合征 (acLQTS) 是某些药物 (包括三氧化 (ATO)) 的严重副作用,用于治疗急性前兆细胞白血病.
- ATO诱导的心脏毒性会导致危及生命的节律失常,例如torsade de pointes (TdP).
研究的目的:
- 研究长非编码RNAMALAT1在ATO诱导的acLQTS中的作用.
- 阐明ATO心脏毒性作用背后的分子机制.
- 确定潜在的治疗药物,以减轻ATO引起的心脏毒性,并针对ACLQTS进行针对性干预.
主要方法:
- 基因芯片阵列用于识别失调的长非编码RNA (lncRNAs).
- 定量QRT-PCR和RNA结合蛋白免疫沉 (RIP) 用于分析lncRNA表达和相互作用.
- 用于蛋白质分析和全细胞补丁记录的西部抹杀,以评估hERG通道功能.
主要成果:
- 三氧化物 (ATO) 在表达hERG通道的细胞中显著上调MALAT1表达.
- 发现MALAT1与calpain-1相互作用,抑制其降解并增强其对hERG通道的活性.
- 费克索芬纳丁 (FEX) 和坦辛IIA (TAN) 减轻了ATO对MALAT1/calpain-1通路的影响,恢复了hERG蛋白水平.
结论:
- ATO诱导的心脏毒性和hERG通道减少与MALAT1过度表达和加大calpain-1活性有关.
- 坦辛IIA和fexofenadine可以通过减少MALAT1表达和抵消ATO对MALAT1/calpain-1通路的影响来恢复hERG水平.
- 这项研究揭示了ATO诱导的acLQTS的新型调节机制,并确定了MALAT1,calpain-1和潜在的治疗剂作为干预目标.
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