谷氨酸受体
生物
兴奋毒性
下调和上调
星形胶质细胞
细胞生物学
神经科学
生物化学
中枢神经系统
受体
基因
作者
Xingxing Xu,Jiaojiao Wang,Siyu Du,Xiya Shen,Jiashu Lian,Jian Zhou,Mianxian Wang,Wenjin Feng,Zhaoting Lv,Junzhe Zhu,Lingting Jin,Huankun Sun,Lihao Wu,Xiaoning Wang,Haoyu Qiu,Wei Wang,Hui Teng,Ying Wang,Zhihui Huang
出处
期刊:Glia
[Wiley]
日期:2023-01-08
卷期号:71 (5): 1197-1216
被引量:2
摘要
The homeostasis of glutamate is mainly regulated by the excitatory amino acid transporters (EAATs), especially by EAAT2 in astrocytes. Excessive glutamate in the synaptic cleft caused by dysfunction or dysregulation of EAAT2 can lead to excitotoxicity, neuronal death and cognitive dysfunction. However, it remains unclear about the detailed regulation mechanism of expression and function of astrocytic EAAT2. In this study, first, we found increased neuronal death and impairment of cognitive function in YAPGFAP -CKO mice (conditionally knock out Yes-associated protein [YAP] in astrocytes), and identified EAAT2 as a downstream target of YAP through RNA sequencing. Second, the expression of EAAT2 was decreased in cultured YAP-/- astrocytes and the hippocampus of YAPGFAP -CKO mice, and glutamate uptake was reduced in YAP-/- astrocytes, but increased in YAP-upregulated astrocytes. Third, further investigation of the mechanism showed that the mRNA and protein levels of β-catenin were decreased in YAP-/- astrocytes and increased in YAP-upregulated astrocytes. Wnt3a activated YAP signaling and up-regulated EAAT2 through β-catenin. Furthermore, over-expression or activation of β-catenin partially restored the downregulation of EAAT2, the impairment of glutamate uptake, neuronal death and cognitive decline that caused by YAP deletion. Finally, activation of EAAT2 also rescued neuronal death and cognitive decline in YAPGFAP -CKO mice. Taken together, our study identifies an unrecognized role of YAP signaling in the regulation of glutamate homeostasis through the β-catenin/EAAT2 pathway in astrocytes, which may provide novel insights into the pathogenesis of brain diseases that closely related to the dysfunction or dysregulation of EAAT2, and promote the development of clinical strategy.
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