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1.昆明医科大学第一附属医院神经内科,昆明 650032
2.昆明医科大学第一附属医院心脏大血管外科,昆明 650032
蒋 雯,Email:arainj@126.com, 研究方向:脑血管病。
梅 松,Email:meisong123@126.com。
收稿:2023-05-13,
修回:2023-09-07,
录用:2023-09-14,
纸质出版:2024-02-28
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蒋雯,邓琼花,梅松.M1表型的小胶质细胞外泌体对血脑屏障功能的影响[J].重庆医科大学学报,2024,49(2):153-157.
Jiang Wen,Deng Qionghua,Mei Song.Effects of M1 microglia-derived exosomes on the function of the blood-brain barrier[J].Journal of Chongqing Medical University,2024,49(2):153-157.
蒋雯,邓琼花,梅松.M1表型的小胶质细胞外泌体对血脑屏障功能的影响[J].重庆医科大学学报,2024,49(2):153-157. DOI: 10.13406/j.cnki.cyxb.003419.
Jiang Wen,Deng Qionghua,Mei Song.Effects of M1 microglia-derived exosomes on the function of the blood-brain barrier[J].Journal of Chongqing Medical University,2024,49(2):153-157. DOI: 10.13406/j.cnki.cyxb.003419.
目的
2
研究M1表型的小胶质细胞外泌体(M1 microglia-derived exosome,M1-exo)对体外血脑屏障(blood-brain barrier,BBB)功能及血管内皮细胞间紧密连接蛋白表达的影响。
方法
2
用脂多糖(lipopolysaccharide,LPS)刺激小鼠小胶质细胞来源的细胞系BV2细胞,流式技术检测其向M1型极化情况,分离提取外泌体。用小鼠脑微血管内皮细胞系b.End3细胞与原代培养的小鼠星形胶质细胞构建体外BBB模型,随机分为3组:b.End3细胞正常培养组(b.End3组)、b.End3细胞+25 μg/mL正常BV2细胞来源外泌体(BV2-derived exosome,BV2-exo)组(b.End3+BV2-exo组)、b.End3细胞+25 μg/mL M1表型的小胶质细胞来源外泌体组(b.End3+M1-exo组)。按实验分组将不同来源外泌体与BBB模型共培养,检测各组的跨膜电阻(trans-endothelial electrical resistance,TEER)、荧光黄通过率,免疫印迹法(Western blot,WB)检测紧密连接复合物蛋白Claudin-1、Occludin、ZO-1及JAM蛋白的表达。
结果
2
①小胶质细胞向M1型极化成功,其细胞标志物CD16/32阳性率较对照组明显升高(
P
=0.023);②与M1-exo共培养后,体外BBB模型的TEER明显下降(
P
=0.000),对荧光黄的透过率明显增加(
P
=0.000);③与b.End3组和b.End3 + BV2-exo组相比,b.End3+M1-exo组的Claudin-1、Occludin及ZO-1蛋白的表达水平明显下降。
结论
2
M1-exo可以破坏BBB的完整性,影响其功能。
Objective
2
To investigate the effects of M1 microglia-derived exosomes(M1-exo) on the function of an in-vitro blood-brain barrier(BBB) model and the expression of tight junction proteins between vascular endothelial cells.
Methods
2
Mouse microglia-derived BV2 cells were stimulated with lipopolysaccharide to be polarized towards the M1 phenotype,and exosomes were isolated and extracted after the phenotype was confirmed by flow cytometry. An in-vitro BBB model was constructed using the mouse brain microvascular endothelial cell line b.End3 and primary cultured mouse astrocytes. The BBB model was co-cultured with exosomes of different sources in three groups:normal culture for b.End3 cells(b.End3 group);b.End3 cells + 25 μg/mL exosomes derived from normal BV-2 cells(b.End3+BV2-exo group);and b.End3 cells+25 μg/mL M1-exo(b.End3+M1-exo group). Trans-endothelial electrical resistance(TEER) and Lucifer yellow permeability were examined. The expression of tight junction complex proteins(claudin-1,occludin,zonula occludens-1[ZO-1],and junctional adhesion molecules) was measured by Western blot.
Results
2
Microglia were successfully polarized to the M1 type,and the positivity rate of the M1 marker CD16/32 was significantly increased compared with the control group(
P
=0.023). After co-culture with M1-exo,the TEER of the in-vitro BBB model was significantly decreased(
P
<
0.001),and Lucifer yellow permeability was significantly increased(
P
<
0.001). Compared with the b.End3 group and b.End3+BV2-exo group,the b.End3+M1-exo group showed significantly decreased expression levels of claudin-1,occludin,and ZO-1.
Conclusion
2
M1-exo can disrupt the integrity of BBB and interfere with its normal function.
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