AGING CELL:老化细胞中积累核外DNA,加剧衰老和炎症

2019-02-10 海北 MedSci原创

研究人员之前已经确定了一种细胞自主途径,通过该途径将受损的核DNA转运到胞质中,在那里它激活引发炎症的先天细胞溶质DNA传感器。

全身炎症是衰老相关疾病的核心。然而,诱导炎症的内在因素尚不清楚。

研究人员之前已经确定了一种细胞自主途径,通过该途径将受损的核DNA转运到胞质中,在那里它激活引发炎症的先天细胞溶质DNA传感器。

这些结果使研究人员进一步假设,累积损伤后释放的DNA通过类似的机制导致衰老细胞中的持续炎症。

与这一概念一致,研究人员发现,老年细胞与年轻细胞相比,其核外核DNA含量更高。DNA通过细菌素B敏感途径输出核外,通过自噬体-溶酶体途径降解,并通过DNA感应cGAS-STING途径触发先天免疫应答。

来自衰老疾病共济失调和早衰的患者细胞中也显示出核外DNA的积累,pIRF3和pTBK1的增加,以及STING依赖性p16表达。

使用DNASE2A去除衰老细胞中的核外DNA,可以降低先天免疫反应和衰老相关(SA)β-gal酶活性。具有DNA降解缺陷的Dnase2a -/- 小鼠的细胞和组织表现出生长缓慢,β-gal活性增加,以及HP-1β和p16蛋白表达增加,而Dnase2a -/- ; Sting -/- 的细胞和组织则不受这些表型干扰。这支持了核外DNA在衰老中的作用。

研究人员假设核外DNA在衰老相关炎症和复制衰老中起直接作用,并提出DNA降解作为一种治疗方法,以去除内在DNA,并恢复与衰老相关的炎症。


原始出处:

Yuk Yuen Lan et al. Extranuclear DNA accumulates in aged cells and contributes to senescence and inflammation. Aging Cell, 2019; doi: https://doi.org/10.1111/acel.12901


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