通过KTN1介导的未折叠蛋白质反应保护质细胞免受电离辐射诱导的DNA损伤
Xinli Niu1, Yi Shen1, Yunhan Wen1
1Department of Radiation Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, NMPA Key Laboratory for Safety Evaluation of Cosmetics, School of Public Health, Southern Medical University, Guangzhou, China.
Journal of dermatological science
|March 6, 2024
概括
电离辐射 (IR) 激活了皮肤细胞中的未折叠蛋白质反应 (UPR). UPR可以防止IR诱导的DNA损伤,KTN1蛋白在这种保护机制中发挥着关键作用.
科学领域:
- 细胞生物学 细胞生物学
- 辐射瘤学 辐射瘤学
- 皮肤病学 皮肤病学
背景情况:
- 展开的蛋白质反应 (UPR) 是一种关键的细胞保护机制,对正常皮肤功能至关重要.
- 电离辐射 (IR) 导致皮肤损伤,这是放射治疗常见的副作用,但其对皮肤的UPR的影响尚不清楚.
研究的目的:
- 调查UPR在缓解红外线诱导的DNA损伤在角质细胞中的作用.
- 探索内细胞网膜 (ER) 蛋白KTN1和在IR之后的UPR激活之间的关系.
主要方法:
- 质细胞模型 (HaCaT,HEK-A) 用于通过电子显微镜和免疫阻塞来评估ER光和UPR通路蛋白质表达 (PERK,IRE1α,ATF6).
- 用UPR抑制 (4-PBA) 和KTN1删除来评估它们对IR后DNA损伤和细胞增殖的影响.
- 用UPR的活性化 (图尼卡米) 来证实其保护作用.
主要成果:
- 红外线激活了角质细胞中的UPR,而UPR抑制则加剧了DNA损伤并减少了细胞增殖.
- IR上调KTN1表达;KTN1枯竭减少了ER扩张和UPR蛋白水平.
- KTN1的枯竭加剧了IR诱导的DNA损伤和抑制的增殖,效应被UPR的重新激活所逆转.
结论:
- 删除KTN1通过抑制UPR.加剧了IR诱导的角质细胞DNA损伤.
- 这些发现阐明了状细胞对红外线诱导损伤的反应的新机制,突出了KTN1在UPR中的作用.
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