DAMPs驱动着玻璃眼ONH中的纤维炎变化
Emma K Geiduschek1, Emma K Bricco1, Colleen M McDowell1
1University of Wisconsin-Madison, Madison, Wisconsin, United States.
Investigative ophthalmology & visual science
|October 9, 2024
概括
这项研究揭示了纤维素蛋白额外域A (FN+EDA) 在新型小鼠模型中驱动着青光眼的进展. 增加的FN+EDA和炎症标志物加速视神经损伤和视力丧失.
科学领域:
- 眼科医生 眼科 眼科
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 视神经头部 (ONH) 是青光斑损伤的主要部位,但启动的分子机制仍然不清楚.
- 含有额外域A (FN+EDA) 的纤维菌素是一种与损伤相关的分子模式 (DAMP),通过Toll-like受体4触发纤维炎症反应.
研究的目的:
- 使用新型小鼠模型 (B6.EDA+/+) 调查FN+EDA在引发眼损伤中的作用.
- 描述与FN+EDA表达相关的老化ONH的分子机制和长期病理生理变化.
主要方法:
- B6.EDA+/+和C57BL/6J小鼠在12个月和22个月时被评估视网膜质细胞 (RGC) 死亡,视网膜神经纤维层 (RNFL) 厚度和视神经 (ON) 损伤.
- 视神经头部 (ONH) 组织使用激光捕获微解剖,RNA测序,基因组丰富分析 (GSEA) 和免疫组织化学 (IHC) 染色进行了分析.
主要成果:
- 与对照组相比,EDA+/+小鼠显示眼内压力显著增加,RGC损失,RNFL稀释和ON损伤.
- 在B6.EDA+/+小鼠中观察到FN+EDA和biglycan的蛋白质水平升高.
- GSEA揭示了显著的基因表达变化,IHC证实B6.EDA+/+小鼠的干扰素 (IFN) 和pSTAT1表达增加.
结论:
- 这项研究详细介绍了视网膜,ON和ONH在2年内发生的玻璃眼变化,确定了新的分子通路.
- 这些发现突出了FN+EDA对老化ONH的纤维炎症反应的影响,在一个新的青光眼小鼠模型中.
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