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电离辐射通过激活NF-κB/CTCF/p16通路诱导血管光滑肌肉细胞衰老
Xuefeng Zheng1, Zhiwei Liu2, Yawen Bin3
1Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China; The Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou 450008, China.
电离辐射 (IR) 通过NF-κB/CTCF/p16通路促进血管光滑肌细胞 (VSMC) 衰老. 这项研究阐明了辐射诱导动脉样硬化背后的机制,为治疗策略提供了洞察力.
科学领域:
- 血管生物学 血管生物学
- 辐射生物学 辐射生物学
- 细胞衰老 细胞衰老
背景情况:
- 血管辐射损伤 (RIBV) 是放射治疗的严重长期并发症,导致动脉样硬化.
- 血管光滑肌细胞 (VSMC) 衰老与辐射诱导的动脉样硬化有关,但潜在的机制尚不清楚.
研究的目的:
- 研究电离辐射 (IR) 诱导VSMC衰老的机制.
- 探索NF-κB通路,CTCF和HMGB2在IR诱导的VSMC衰老中的作用.
主要方法:
- 使用SA-β-gal染色和p16/p21表达分析在体外和体内评估VSMC衰老.
- 通过p65转位和结合试验 (EMSA) 证实了NF-κB通路的激活.
- 蛋白质表达 (HMGB2,CTCF) 通过西方斑点分析;CTCF聚类使用超分辨率显微镜可视化.
- 染色体免疫沉 (ChIP) 确定了CTCF-p16基因相互作用. 在抑制/过度表达研究中使用了lentiviruses和PDTC.
主要成果:
- 电离辐射显著增加了VSMC衰老,激活了NF-κB通路.
- 红外线导致HMGB2表达减少和CTCF聚类增加,促进CTCF-p16基因相互作用.
- 抑制CTCF或过度表达HMGB2,并抑制NF-κB减少IR诱导的衰老标志物 (SA-β-gal,p16,p21) 和CTCF聚类.
结论:
- 电离辐射通过NF-κB通路诱导VSMC衰老,该通路调节CTCF聚类和p16表达.
- NF-κB/CTCF/p16通路是驱动辐射诱导的VSMC衰老和潜在的动脉样硬化的关键机制.
- 准这种途径可能为减轻辐射诱导的血管并发症提供新的治疗策略.
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