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系统性红斑狼患者的罕见TRAF5编码变异通过内皮功能障碍加剧肺高血压
Xiaoyue Deng1,2,3,4, Tianyi Yuan5, Junyan Qian1,2,3,4
1Department of Rheumatology and Clinical Immunology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
罕见的TRAF5基因变异与系统性红斑狼 (SLE) 患者的肺动脉高血压 (PAH) 有关. 缺少TRAF5会损害内皮细胞功能,恶化SLE-PAH,并提出新的治疗点.
科学领域:
- 免疫学 免疫学 免疫学
- 遗传学 是一个遗传学.
- 心脏病学 心脏病学
背景情况:
- 肺动脉高血压 (PAH) 是系统性红斑狼 (SLE) 的严重并发症.
- SLE-PAH显著增加死亡率,并与右心力衰竭有关.
- 目前尚不完全了解SLE-PAH的潜在病原体.
研究的目的:
- 调查SLE-PAH的遗传基础和病变发生.
- 确定可能导致SLE-PAH发展的遗传风险因素.
- 探索TRAF5在SLE-PAH病变发生中的作用及其治疗潜力.
主要方法:
- 在患有SLE-PAH的患者,没有PAH的SLE患者和健康对照人群中进行了全外体序列测序.
- 基因负担分析发现了罕见的编码变体.
- 在患者样本和淘汰赛小鼠中评估了TRAF5表达水平.
- 功能性研究包括TRAF5淘汰赛小鼠,单细胞RNA测序和肺动脉内皮细胞 (ECs) 的体外试验.
- 使用一种具有内皮特异性TRAF5过度表达的SLE-PAH小鼠模型.
主要成果:
- 罕见的TRAF5编码变异在SLE-PAH患者中相比于SLE-non-PAH患者和健康对照组中明显更频繁 (分别为p = 0.029和p = 0.008).
- 在SLE-PAH变异载体中,TRAF5表达减少.
- 在TRAF5淘汰的小鼠中,肺高血压恶化,右心室缩以及死亡率呈现出明显的变化.
- 在小鼠中,TRAF5缺乏导致了EC细胞亡和BMP/TGF-β通路的激活.
- 在体外研究证实,由于TRAF5缺乏,肺动脉EC功能受损.
- 在SLE-PAH小鼠模型中,TRAF5的过度表达减弱了肺高血压.
结论:
- 在TRAF5中功能丧失的变体会加剧SLE-PAH.
- 通过BMP/TGF-β信号传递,TRAF5缺乏促进了EC功能障碍和疾病严重程度.
- 对于SLE-PAH来说,TRAF5是一个潜在的治疗点.
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