Blue light damaged-retinal pigment epithelial cell derived-exosomes activate nod-like receptor protein inflammasome
10.3760/cma.j.issn.1005-1015.2017.05.014
- VernacularTitle:蓝光诱导人视网膜色素上皮细胞分泌外泌体与核苷酸结合寡聚化结构样受体蛋白炎性体的相关性研究
- Author:
Yingxue MA
1
;
Song CHEN
;
Guanghui HE
;
Jing YANG
;
Li CHEN
;
Jianhong JIANG
;
Jian SONG
Author Information
1. 天津市第一中心医院眼科
- Keywords:
Retinal pigment epithelium/physiopathology;
Exosomes;
Inflammasomes;
Photic stimulation/adverse effects
- From:
Chinese Journal of Ocular Fundus Diseases
2017;33(5):498-502
- CountryChina
- Language:Chinese
-
Abstract:
Objective To observe the effect of exosomes secreted by retinal pigment epithelial (RPE) cells which damaged by blue light to Nod-like receptor protein (NLRP3). Methods Cultured ARPE-19 cells were divided into 2 groups; one group of RPE cells were exposed to blue light irradiation for 6 hours, the other group was cultured in routine environment. Total exosomes were extracted from the two groups by differential ultracentrifugation in low-temperature, and examined by transmission electron microscope to identify their forms. The exosomes were then incubated with normal ARPE-19 cells. The expression level of CD63, interleukin (IL)-1β, IL-18 and caspase-1 on the exosome surface were measured by Western blotting. The expressions of NLRP3 mRNA in RPE cells were detected by real-time fluorescence quantitative reverse transcription polymerase chain reaction (RT-PCR). Results Blue light damaged the cellular morphology. Transmission electron microscopy showed that the exosomes were 50-200nm in diameter and like double-concave disks. Blue light damaged cell-derived exosomes had significantly higher expression of IL-1β (t=18.04),IL-18 (t=12.55) and caspase-1 (t=14.70) than the control group (P<0.001). ARPE-19 cells cultured with blue light damaged cell-derived exosomes also had significantly higher expression of IL-1β (t=18.59), IL-18 (t=23.95) and caspase-1 (t=35.27) than control exosomes (P<0.001). RT-PCR showed that the relative expression of NLRP3 mRNA of PRE cells in experimental group and control group were 1.000±0.069 and 0.2±0.01, respectively, the difference was significant (t=12.20, P<0.001). Conclusion The expression IL-1β, IL-18 and caspase-1 and NLRP3 mRNA were upregulated by exosomes secreted by blue light damaged-RPE cells.
