Effect of microglial derived extracellular vesicles on neuronal damage after heat stress

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Effect of microglial derived extracellular vesicles on neuronal damage after heat stress

Neuroscience | 更新时间：2026-01-09

- Effect of microglial derived extracellular vesicles on neuronal damage after heat stress
- Journal of Army Medical University Vol. 46, Issue 18, Pages: 2029-2035(2024)
- 作者机构：
  
  400038 重庆，陆军军医大学(第三军医大学)军事预防医学系热带医学教研室
- 作者简介：
- 基金信息：
  
  the General Project of Natural Science Foundation of Chongqing(cstc2020jcyj-msxmX1020)
- DOI：10.16016/j.2097-0927.202403095
  CLC： R338.1;R339.52;R363.21
- Received：23 March 2024，
  
  Revised：2024-05-19，
  
  Published：30 September 2024
- 稿件说明：
移动端阅览
Ping LI, Xue LUO, Zhen LUO, et al. Effect of microglial derived extracellular vesicles on neuronal damage after heat stress[J]. Journal of Army Medical University, 2024, 46(18): 2029-2035.
DOI：

Ping LI, Xue LUO, Zhen LUO, et al. Effect of microglial derived extracellular vesicles on neuronal damage after heat stress[J]. Journal of Army Medical University, 2024, 46(18): 2029-2035. DOI： 10.16016/j.2097-0927.202403095.

摘要

目的

2

探究热刺激后小胶质细胞细胞外囊泡对神经元损伤的影响。

方法

2

热刺激BV2小胶质细胞后收集上清，通过不同的超速离心速度获取细胞外大囊泡和小囊泡。利用纳米粒度分析仪检测粒径，利用Western blot检测囊泡上TSG101、CD63和flotillin-1的表达。PKH67标记BV2来源的囊泡后与N2a细胞共孵育，检测神经元对小胶质细胞细胞外囊泡的摄取情况。分别将热刺激后BV2来源的大囊泡和小囊泡与N2a共孵育，通过CCK-8、细胞外乳酸脱氢酶(lactate dehydrogenase

LDH)、台盼蓝染色和TUNEL染色法评价热刺激后N2a的损伤情况。

结果

2

小囊泡粒径介于30~120 nm，高表达TSG101和CD63，大囊泡粒径介于90~1 000 nm，高表达flotillin-1；BV2来源的细胞外囊泡可被N2a细胞摄取并参与热刺激对N2a细胞损伤的调节，其中CCK-8检测结果表明小胶质细胞来源的大小囊泡均能降低热刺激后N2a细胞的活力(

P

<

0.05)。LDH检测、台盼蓝染色及TUNEL检测结果表明大囊泡(

P

<

0.05)和小囊泡(

P

<

0.01)均能显著提高热刺激后N2a细胞LDH的释放水平、N2a细胞的蓝染水平及凋亡程度，且小囊泡处理组中N2a细胞的LDH释放水平、蓝染和凋亡水平高于大囊泡处理组。

结论

2

热刺激后小胶质细胞通过细胞外囊泡加剧了神经元的损伤。

Abstract

Objective

2

To investigate the effect of microglial derived extracellular vesicles on neuronal damage in the context of heat stress.

Methods

2

After BV2 microglial cells were exposed to heat stress

the supernatant was collected and subjected to ultracentrifugation at different speeds to obtain large and small vesicles

respectively. Nano Particle Tracking and Zeta Potential Distribution Analyzer was used to measure and analyze the size distribution of the large vesicles and small vesicles. Western blotting was used to detect the expression of specific vesicle surface markers

TSG101

CD63 and flotillin-1. Microglial extracellular vesicles were labeled with PKH67 dye and then co-cultured with N2a cells to examine the uptake by capacity the neurons. After large and small vesicles derived from microglia after heat stress stimulation were co-cultured with N2a cells

respectively

CCK-8 assay

lactate dehydrogenase (LDH) assay

Trypan blue staining and TUNEL assay were employed to evaluate heat stress induced neuronal damage.

Results

2

The small vesicles were in a particle size of 30~120 nm

and highly expressed TSG101 and CD63

whereas the large vesicles

in a size of 90~1 000 nm

highly expressed flotillin-1. The BV2-derived extracellular vesicles could be taken up by N2a cells and were proved to be involved in the modulation of N2a cell injury caused by heat stress. CCK-8 assay showed that both large and small vesicles of microglial cells inhibited the viability of N2a cells after heat exposure (

P

<

0.05). The results of LDH assay

Trypan blue staining and TUNEL assay showed that both large (

P

<

0.05) and small vesicles (

P

<

0.01) significantly enhanced the LDH release

blue stain intensity and apoptosis of N2a cells after heat exposure

and the release

intensity and apoptosis were stronger in the cells treated with small vesicles than those group of large vesicles.

Conclusion

2

Microglia aggravate heat stress-induced neuronal damage through releasing extracellular vesicles.

关键词

Keywords

references

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