The anesthetic sevoflurane induces tau trafficking from neurons to microglia.

The anesthetic sevoflurane induces tau trafficking from neurons to microglia.
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麻醉剂七氟醚诱导 tau 蛋白从神经元运输到小胶质细胞。

DOI:
10.1038/s42003-021-02047-8
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发表时间:
2021-05-12
影响因子:
5.9
通讯作者:
Xie Z
Xie Z
中科院分区:
生物学2区
文献类型:
--
作者:
Dong Y;Liang F;Huang L;Fang F;Yang G;Tanzi RE;Zhang Y;Quan Q;Xie Z

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在阿尔茨海默病和其他tau病变中,tau蛋白的积累和扩散以朊病毒样方式发生。然而,tau蛋白贩运的机制和下游后果在很大程度上仍然未知。我们假设tau蛋白通过细胞外囊泡(EVs)从神经元转运到小胶质细胞,导致IL-6的产生和认知障碍。我们评估了麻醉剂七氟醚和地氟醚处理的小鼠和神经元,并应用纳米束传感器技术,一种超灵敏的方法,测量tau/p-tau的量。七氟醚(而非地氟醚)增加了血液、神经元培养基或ev中的tau或p-tau含量。七氟醚增加脑间质液中p-tau的含量。tau敲除小鼠的小胶质细胞在七氟醚条件神经元培养液处理下摄取tau和p-tau,导致IL-6的产生。Tau磷酸化抑制剂锂和ev生成抑制剂GW4869减弱Tau转运。GW4869减轻了七氟醚引起的小鼠认知障碍。因此,tau蛋白运输可能发生从神经元到小胶质细胞产生IL-6,导致认知障碍。Yuanlin Dong等人利用他们之前开发的纳米束传感器技术检测血液中的tau蛋白,发现麻醉剂七氟醚诱导小鼠从神经元到小胶质细胞的tau蛋白运输。他们进一步发现,小胶质细胞可以吸收tau蛋白,导致Il-6的产生,总体上为七氟醚介导的认知障碍的机制带来了新的见解。
Accumulation and spread of tau in Alzheimer’s disease and other tauopathies occur in a prion-like manner. However, the mechanisms and downstream consequences of tau trafficking remain largely unknown. We hypothesized that tau traffics from neurons to microglia via extracellular vesicles (EVs), leading to IL-6 generation and cognitive impairment. We assessed mice and neurons treated with anesthetics sevoflurane and desflurane, and applied nanobeam-sensor technology, an ultrasensitive method, to measure tau/p-tau amounts. Sevoflurane, but not desflurane, increased tau or p-tau amounts in blood, neuron culture medium, or EVs. Sevoflurane increased p-tau amounts in brain interstitial fluid. Microglia from tau knockout mice took up tau and p-tau when treated with sevoflurane-conditioned neuron culture medium, leading to IL-6 generation. Tau phosphorylation inhibitor lithium and EVs generation inhibitor GW4869 attenuated tau trafficking. GW4869 mitigated sevoflurane-induced cognitive impairment in mice. Thus, tau trafficking could occur from neurons to microglia to generate IL-6, leading to cognitive impairment. Using their previously developed nanobeam-sensor technology to detect tau protein in the blood, Yuanlin Dong et al. find that the anaesthetic sevoflurane induces trafficking of tau from neurons to microglia in mice. They further see that microglia can take up tau, leading to Il-6 production, overall bringing new insights into the mechanism of sevoflurane-mediated cognitive impairment.
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