Nrf2对甲基苯丙胺诱导小胶质细胞激活和极化的调控作用研究
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国家卫健委毒品依赖和戒治重点实验室/昆明医科大学法医学院

基金项目:

]国家自然科学基金资助项目(NO 82202081),省科技厅基础研究项目(202301AT070269,202301AU070216),省科技厅-昆医联合专项(202301AY070001-234,202201AY070001-021)


Regulation of Nrf2 on activation and polarization of microglia induced by Methamphetamine
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NHC Key Laboratory of Drug Addiction Medicine,School of Forensic Medicine,Kunming Medical University

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    摘要:

    目的 探讨Nrf2对METH诱导小胶质细胞激活和极化的调控作用。方法 体外实验以BV2细胞和HMC3细胞为研究对象;体内实验以野生型小鼠和Nrf2基因敲除鼠为研究对象,分别建立体内外METH诱导的毒性作用模型,应用IF和WesternBlot分别检测各组细胞和小鼠脑组织内小胶质细胞激活和极化的表达情况。结果 给予METH后,BV2和HMC3细胞表达小胶质细胞M1表型标志蛋白iNOS的荧光水平显著性升高,而表达小胶质细胞M2表型标志蛋白Arg1的荧光水平明显降低,结果说明METH可诱导小胶质细胞极化,同时增强小胶质细胞的促炎作用,而降低小胶质细胞的抗炎作用。应用Nrf2基因敲除鼠进一步探讨Nrf2对METH诱导小胶质细胞激活和极化的调控作用。结果显示:给予METH后,小鼠皮质内小胶质细胞明显被激活,同时皮质内IBA1和iNOS的表达水平明显升高,Arg1的表达水平降低。与野生型METH组相比,Nrf2基因敲除后给予METH发现小胶质细胞激活的数量明显增多,同时IBA1和iNOS的表达水平有所升高和Arg1的表达水平有所降低。上述结果表明METH诱导小胶质细胞激活和极化的同时,可增强小胶质细胞的促炎作用和降低其抗炎作用。而Nrf2基因敲除后,METH激活小胶质细胞及METH的促炎作用和降低抗炎作用更加显著。 结论 Nrf2对METH诱导小胶质细胞激活和极化具有的重要调控作用,Nrf2有望成为治疗METH诱导神经炎症的潜在干预靶点。

    Abstract:

    Objective To investigate the regulation of Nrf2 on activation and polarization of microglia induced by METH. Methods BV2 cells and HMC3 cells were studied in vitro. Wild-type mice and Nrf2 knockout mice were studied in vivo.TheStoxicity models induced by METH inSvivoSand inSvitro were established respectively. And the IF and WesternBlot were used to detect the activation and polarization of microglia in each group, respectively. Results After treatment with METH, the fluorescence level of iNOS(Marker protein of polarized M1 phenotype in microglia) increased significantly in BV2 and HMC3 cells, while the fluorescence level of Arg1 (Marker protein of polarized M2 phenotype in microglia) decreased significantly. The results showed that METH could induce microglia polarization, and enhance the pro-inflammatory effect, and reduce the anti-inflammatory effect of microglia. The Nrf2 gene knockout mice were used to further explore the regulation of Nrf2 on the activation and polarization of microglia induced by METH. The results showed that after exposure to METH, microglia in the cortex of mice were obviously activated, and the expression levels of IBA1 and iNOS were obviously increased, while the expression level of Arg1 was decreased. Compared with wild-type METH group, the number of microglia activated after Nrf2 gene knockout was significantly increased, while the expression levels of IBA1 and iNOS were increased and the expression level of Arg1 was decreased. The above results indicated that METH could enhance the pro-inflammatory effect of microglia and reduce its anti-inflammatory effect while inducing the activation and polarization of microglia. However, after Nrf2 gene was knocked out, the effect of METH activated microglia and its pro-inflammatory and anti-inflammatory effects were stronger. Conclusions Nrf2 plays an important role in regulating the activation and polarization of microglia induced by METH, and Nrf2 was expected to be a potential target for the treatment of neuroinflammation induced by METH.

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  • 收稿日期:2024-07-14
  • 最后修改日期:2024-10-12
  • 录用日期:2024-12-26
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