RAC1
CDC42型
GTP酶
细胞生物学
功能(生物学)
信号转导
小型GTPase
髓样
损失函数
受体
化学
癌症研究
神经科学
生物
表型
基因
生物化学
作者
Zhouyi Rong,Baoying Cheng,Li Zhong,Xiaowen Ye,Xin Li,Lin Ji,Yanfang Li,Francis Shue,Na Wang,Yiyun Cheng,Xiaohua Huang,Chia-Chen Liu,John Denis Fryer,Xin Wang,Yunwu Zhang,Honghua Zheng
标识
DOI:10.1096/fj.202000550rr
摘要
Mutation of Triggering receptor expressed on myeloid cells 2 (TREM2) impairs the response of microglia to amyloid-β (Aβ) pathology in Alzheimer's disease (AD), although the mechanism governing TREM2-regulated microglia recruitment to Aβ plaques remains unresolved. Here, we confirm that TREM2 mutation attenuates microglial migration. Then, using Trem2-/- mice and an R47H variant mouse model for AD generated for this study, we show that TREM2 deficiency or the AD-associated R47H mutation results in inhibition of FAK and Rac1/Cdc42-GTPase signaling critical for cell migration. Intriguingly, treatment with CN04, a Rac1/Cdc42-GTPase activator, partially enhances microglial migration in response to oligomeric Aβ42 in Trem2-/- or R47H microglia both in vitro and in vivo. Our study shows that the dysfunction of microglial migration in the AD-associated TREM2 R47H variant is caused by FAK/Rac1/Cdc42 signaling disruption, and that activation of this signaling ameliorates impaired microglial migration response to Aβ42 , suggesting a therapeutic target for R47H-bearing patients with high risk of AD.
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