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Yang, Yutao; Li, Yueting; Liu, Bo; Li, Chenchen; Liu, Zijin; Deng, Jiahui; Luo, Hanjiang; Li, Xiaoxiao; Wu, Jinjin; Li, Hui; Wang, Chuan-Yue; Zhao, Ming; Wu, Haohao; Lallemend, Francois; Svenningsson, Per; Hökfelt, Tomas G M; Xu, Zhi-Qing David
Proceedings of the National Academy of Sciences, 06/2021, Letnik: 118, Številka: 24Journal Article
Galanin receptor1 (GalR1) transcript levels are elevated in the rat ventral periaqueductal gray (vPAG) after chronic mild stress (CMS) and are related to depression-like behavior. To explore the mechanisms underlying the elevated GalR1 expression, we carried out molecular biological experiments in vitro and in animal behavioral experiments in vivo. It was found that a restricted upstream region of the gene, from -250 to -220, harbors an E-box and plays a negative role in the promoter activity. The transcription factor Scratch2 bound to the E-box to down-regulate promoter activity and lower expression levels of the gene. The expression of Scratch2 was significantly decreased in the vPAG of CMS rats. Importantly, local knockdown of Scratch2 in the vPAG caused elevated expression of GalR1 in the same region, as well as depression-like behaviors. RNAscope analysis revealed that GalR1 mRNA is expressed together with Scratch2 in both GABA and glutamate neurons. Taking these data together, our study further supports the involvement of GalR1 in mood control and suggests a role for Scratch2 as a regulator of depression-like behavior by repressing the gene in the vPAG.
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