Influence of oxidative stress-induced exosomes on Akt and vascular endothelial growth factor-A of retinal ;pigment epithelium cells
10.3760/cma.j.issn.1005-1015.2017.01.015
- VernacularTitle:氧化应激下视网膜色素上皮细胞外泌体对视网膜色素上皮细胞血管内皮生长因子A及丝氨酸/苏氨酸激酶表达的影响
- Author:
Wei ZHANG
;
Jing YANG
;
Song CHEN
;
Guanghui HE
;
Yingxue MA
;
Li CHEN
;
Jianhong JIANG
;
Jian SONG
- Keywords:
Vascular endothelial growth factor A;
Protein-serine-threonine kinases;
Exosomes;
Retinal pigment epithelium cell;
Cells,cultured;
Oxidative stress
- From:
Chinese Journal of Ocular Fundus Diseases
2017;33(1):57-61
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effects of exosomes from cultured human retinal pigment epithelium (ARPE-19) cells affected by oxidative stress on the proliferation and expression of vascular endothelial growth factor-A (VEGF-A) and Akt of ARPE-19 cells. Methods Culture ARPE-19 cells. The concentration of 2.5μmol/L rotenone was selected to simulate oxidative stress and isolated ARPE-19-exosome. Exosomes were isolated by ExoQuick exosome precipitation solution. Transmission electron microscopy was used to identify the morphology of exosomes. Western blot was used to detect exosomes’ surface-specific maker protein CD63. ARPE-19 cells affected by oxidative stress were cultured with exosome as experimental group, normal ARPE-19 cells were cultured with exosome as control group. The cell proliferation was examined by methyl thiazolyl tetrazolium assay. Western blot and immunofluorescence assay were used to detect the expression levels of VEGF-A and Akt protein. Real-time quantitative polymerase chain reaction (RT-PCR) was used to detect the levels of VEGF-A mRNA and Akt mRNA. Results The diameter of normal ARPE-19-exosomes ranged from 50 to 150 nm. The isolated exosomes expressed CD63. AREP-19 cells were cultured with ARPE-19 (affected by rotenone)-exosome, the cell viability in experimental group was significantly reduced than in the control group. Green fluorescence was observed in the cytoplasm under fluorescence microscope. Compared with the control group, VEGF-A was up-regulated expressed and Akt was down-regulated expressed. Western blot results showed that, VEGF-A protein expression in the experimental group were higher than the control group. Akt protein expression in the experimental group were less than the control group. The difference was statically significant (t=3.822, 6.527;P<0.05). RT-PCR results showed that VEGF-A mRNA expression levels was higher in the experimental group than the control group. Akt mRNA expression levels was lower in the experimental group than the control group. The difference was statically significant (t=8.805,?7.823;P<0.05). Conclusions Exosomes from ARPE-19 cells affected by oxidative stress inhibit the proliferation of normal ARPE-19 cells, increase the expression of VEGF-A and reduce the expression of Akt.
