在电离辐射皮肤炎中,希斯变体H2A.J的免疫调节作用
Gargi Tewary1, Benjamin Freyter1, Mutaz Abd Al-Razaq1
1Department of Radiation Oncology, Saarland University Medical Center, Homburg/Saar, Germany.
International journal of radiation oncology, biology, physics
|September 27, 2023
概括
在小鼠皮肤中缺少组素变体H2A.J会导致更严重的辐射皮肤炎. 这是由于衰老的增加,分泌表型的改变和炎症的增加,辐射暴露后皮肤损伤恶化.
科学领域:
- 表观遗传学和辐射生物学
- 皮肤病学和炎症反应
背景情况:
- 基因组突变H2A.J与过早衰老有关,并在电离辐射 (IR) 后调节与衰老相关的分泌表型 (SASP).
- 在辐射性皮肤炎中H2A.J的特定作用尚未完全阐明.
研究的目的:
- 为了研究基因组变异H2A.J在辐射皮肤炎的发展中的作用.
- 分析H2A.J缺乏对皮肤对电离辐射反应的影响.
主要方法:
- 构成H2A.J的淘汰 (KO) 和野生型 (WT) 老鼠接受了不同剂量的皮IR.
- 进行了宏观,显微和分子分析 (免疫组织化学,RNA测序,流细胞计),以评估皮肤反应,衰老,DNA损伤,增殖和免疫细胞透.
主要成果:
- 与WT皮肤相比,照射KO皮肤表现出更严重的炎症反应,表皮厚化和毛囊损失.
- 缺乏H2A.J导致了辐射诱导的衰老,特别是毛囊干细胞的衰老,以及SASP因子释放的增强.
- 转录和流细胞测量分析显示,KO皮肤中的免疫细胞透和中性粒细胞招募加剧,加剧了辐射诱导的毒性.
结论:
- 在皮细胞中缺乏辐射诱导的H2A.J表达,通过增加衰老,调节SASP和加剧炎症反应,加剧了辐射皮肤炎.
- 作为对IR的反应,H2A.J的表观遗传调节对于角质细胞免疫功能和在辐射皮肤炎中保持平衡的炎症反应至关重要.
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