衰老改变了抗微生物的表达,并诱导了视网膜色素上皮细胞中的粉样β的产生
Jian Liu1, Caijiao Yi2, Jinyan Qi1
1Aier Academy of Ophthalmology, Central South University, Changsha, Hunan, China.
Aging cell
|July 14, 2025
概括
来自视网膜细胞的抗微生物随着年龄的增长而下降,增加失明的风险. 衰老细胞显示细菌防御减少和粉样β增加,导致视网膜退化.
科学领域:
- 眼科医生 眼科 眼科
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
背景情况:
- 与年龄相关的视网膜退化 (例如,糖尿病视网膜病变,与年龄相关的黄斑退化) 是导致失明的主要原因.
- 失生症和细菌转移与视网膜退化有关.
- 血视网膜屏障 (BRB) 可能通过抗微生物 (AMP) 保护神经网膜.
研究的目的:
- 研究BRB细胞,特别是视网膜色素上皮细胞 (RPE) 在产生AMP中的作用.
- 为了确定抗微生物活性是否随着年龄的增长而下降,以及在老化的RPE细胞中.
- 探索AMP生产受损,粉样β (Aβ) 沉积和与年龄相关的视网膜退化之间的联系.
主要方法:
- 在RPE细胞中的量化AMP/前体表达 (APP,RARRES2,FAM3A,HAMP,CAMP,GNLY,PI3).
- 在衰老的RPE细胞中评估了细胞内细菌 (大肠杆菌) 的保留和杀死.
- 通过分泌酶活性 (α,β,γ) 和Aβ生产来研究APP处理.
- 检查了来自老年捐赠眼睛的RPE细胞中的Aβ积累.
主要成果:
- RPE细胞表达各种AMP/前体.
- 衰老的RPE细胞显示APP和RARRES2mRNA减少,细菌清除受损,并且在APP沉默时抗菌活性降低.
- 衰老的RPE细胞表现出改变的分泌酶活性,导致可溶性APPα减少和Aβ (特别是Aβ42) 生产增加.
- 年龄较大的供体眼睛在RPE细胞中Aβ积累较高.
结论:
- RPE细胞具有抗微生物活性,但在衰老细胞中这种活性降低了.
- 衰老的RPE细胞中AMP的产生受损和Aβ沉积增加可能会导致与年龄相关的视网膜副炎症和神经退行.
- 这些发现突出了一个新的机制,有助于与年龄相关的视力丧失.
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