摘要目的:观察骨髓间充质干细胞（BMSC）来源的外泌体上miR-183、视网膜脱氢酶11（RDH11）的表达，初步探讨两者靶向关系以及对视网膜色素上皮（RPE）细胞的影响。方法:分离培养C57BL/6(C57）小鼠BMSC，鉴定BMSC来源的外泌体。将BMSC分为空白组、模拟空白对照组（mimic-NC组）、miR-183模拟组（miR-183-mimic组）。参照文献方法培养C57小鼠、视网膜变性10（rd10）小鼠RPE细胞。来自rd10小鼠的RPE细胞转染BMSC外泌体并共培养后分为对照组、外泌体组、mimic-NC-外泌体组（mimic-NC-exo组）、miR-183-mimic-外泌体组（miR-183-mimic-exo组）。采用实时荧光定量聚合酶链反应、蛋白免疫印迹法检测C57小鼠、rd10小鼠以及各组RPE细胞中miR-183、RDH11 mRNA和蛋白相对表达量。生物信息学网站及双荧光素酶报告分析miR-183与RDH11的靶向关系。细胞计数试剂盒8检测BMSC外泌体上miR-183对RPE细胞增生的影响；原位末端标记法检测RPE细胞凋亡情况。多组间比较采用单因素方差分析。结果:与C57小鼠比较，rd10小鼠RPE中miR-183相对表达量下调，RDH11 mRNA相对表达量上调，差异均有统计学意义（ t=5.230、8.548， P=0.006、0.001）。与空白组、mimic-NC组比较，miR-183-mimic组外泌体中miR-183 mRNA相对表达量显著上升（ F=60.130， P<0.05）。共培养24 h时，外泌体进入RPE细胞。与mimic-NC-exo组比较，miR-183-mimic-exo组RPE细胞中miR-183 mRNA相对表达量显著升高（ t=7.311， P=0.002），细胞增生能力增强（ F=10.949， P＝0.012）、凋亡数量减少（ t=4.571， P=0.002），差异均有统计学意义。生物信息学网站及双荧光素酶报告证实miR-183与RDH11具有靶向关系。与mimic-NC组比较，miR-183-mimic组外泌体中RDH11 mRNA及蛋白相对表达量均降低，差异有统计学意义（ t=5.361、6.591， P=0.006、0.003）。共培养后，与对照组比较，外泌体组RPE细胞中RDH11 mRNA及蛋白相对表达量差异无统计学意义（ t=0.169、1.134， P=0.874、0.320）；与mimic-NC-exo组比较，miR-183-mimic-exo组RPE细胞中RDH11 mRNA及蛋白相对表达量均降低，差异有统计学意义（ t=5.554、5.546， P=0.005、0.005）。 结论:上调BMSC来源的外泌体miR-183通过靶向抑制RDH11的表达促进RPE细胞体外增生，减少细胞凋亡数量。

abstractsObjective:To observe the expressions of miR-183 and retinal dehydrogenase 11 (RDH11) in exosomes derived from bone marrow mesenchymal stem cells (BMSC), and to preliminarily explore their targeting relationship and their effects on retinal pigment epithelial (RPE) cells.Methods:BMSC from C57BL/6 (C57) mice were isolated and cultured, and BMSC-derived exosomes were identified. BMSC were divided into blank group, simulation blank control group (mimic-NC group), miR-183 simulation group (miR-183-mimic group). C57 mice and retinal degeneration 10 (rd10) mouse RPE cells were cultured with reference to literature methods. RPE cells from rd10 mice were transfected with BMSC exosomes and co-cultured and divided into control group, exosome group, mimic-NC-exosome group (mimic-NC-exo group), miR-183-mimic-exosome group (miR-183-mimic-exo group). The relative expression levels of miR-183, RDH11 mRNA and protein in C57 mice, rd10 mice and RPE cells in each group were detected by real-time quantitative polymerase chain reaction and western blotting. The targeting relationship between miR-183 and RDH11 was analyzed by bioinformatics website and dual luciferase reporter. Cell counting kit 8 was used to detect the effect of miR-183 on BMSC exosomes on RPE cell proliferation; in situ labeling end labeling method was used to detect RPE cells apoptosis. One-way ANOVA was used to compare multiple groups.Results:Compared with C57 mouse RPE cells, the relative expression of miR-183 in rd10 mouse RPE cells was down-regulated, and the relative expression of RDH11 mRNA was up-regulated, and the differences were statistically significant ( t=5.230, 8.548; P=0.006, 0.001). Compared with the blank group and the mimic-NC group, the relative expression of miR-183 mRNA in the exosomes of the miR-183-mimics group was significantly increased ( F=60.130, P <0.05 ). After 24 h of co-culture, exosomes entered RPE cells. Compared with the mimic-NC-exo group, the relative expression of miR-183 mRNA in RPE cells in the miR-183-mimic-exo group was significantly increased, the proliferation ability was enhanced ( t=7.311, P=0.002), and the number of apoptotic cells was decreased ( F=10.949, P=0.012), and the differences were statistically significant ( t=4.571, P=0.002). Bioinformatics website and dual-luciferase report confirmed that miR-183 has a targeting relationship with RDH11. Compared with the mimic-NC group, the relative expression of RDH11 mRNA and protein in the exosomes of the miR-183-mimic group was decreased, and the difference was statistically significant ( t=5.361, 6.591; P=0.006, 0.003). After co-culture, compared with the control group, there was no significant difference in the relative expression of RDH11 mRNA and protein in RPE cells in the exosome group ( t=0.169, 1.134; P=0.874, 0.320); The relative expressions of RDH11 mRNA and protein in RPE cells in -183-mimic-exo group were decreased, and the difference was statistically significant ( t=5.554, 5.546; P=0.005, 0.005). Conclusion:Up-regulation of BMSC-derived exosomal miR-183 promote the proliferation of RPE cells in vitro by targeting the expression of RDH11 and reduce the number of apoptosis.