Nat Neurosci: 阿尔兹海默病中,PLCγ2介导小胶质细胞炎症作用

2020-06-28 MedSci原创 MedSci原创

研究人员使用基因工程的人类诱导多能干细胞衍生的小胶质细胞样细胞发现,TREM2通过PLCγ2信号来介导细胞存活、吞噬能力、神经元碎片的处理和脂质代谢。

人类遗传数据表明,小胶质功能障碍会促进阿尔茨海默病(AD)的病理,例如,人们在小胶质细胞表达的TREM2中,以及磷脂酶编码基因PLCG2中发现了编码变异。

虽然在小鼠模型中的研究已经牵涉到AD中特定的Trem2依赖性小胶质细胞功能,但至今为止,其潜在的分子机制和对人类疾病的可转化性仍然不甚明确。

在这项研究中,研究人员使用基因工程的人类诱导多能干细胞衍生的小胶质细胞样细胞发现,TREM2通过PLCγ2信号来介导细胞存活、吞噬能力、神经元碎片的处理和脂质代谢。

TREM2或PLCγ2信号的丢失会导致转录失调的共同特征,这是这些表型的基础。

此外,独立于TREM2,PLCγ2也在Toll样受体下游发出信号,以介导炎症反应。

因此,PLCγ2的活性通过不同的TREM2依赖性和不依赖性信号来调控不同的小胶质细胞功能,并可能参与神经退行性疾病相关的小胶质细胞状态的转化。

 

原始出处:

Benjamin J. Andreone et al.  Alzheimer’s-associated PLCγ2 is a signaling node required for both TREM2 function and the inflammatory response in human microglia, Nature Neuroscience (2020). 

 

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    2020-12-11 liye789132251
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    2020-06-30 lsndxfj
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