• 1. The Second Hospital of Tianjin Medical University, Tianjin 300211, China;
  • 2. Laboratory Medicine, General Hospital of Tianjin Medical University, Tianjin 300052, China;
  • 3. Department of Ophthalmology, General Hospital of Tianjin Medical University, Tianjin 300052, China;
Chen Song, Email: chszyy248@163.com
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Objective To preliminarily investigate the mechanism of MMP-9 blocking CD73 detachment from RPE cells surface and preventing and treating experimental autoimmune pigment membranitis (EAU).Methods RPE cells isolated from wild-type C57BL/6 and CD73 gene knockout (CD73-/-) mice were cultured in vitro, and treated with lipopolysaccharide and TNF-α to induce CD73 detachment from RPE surface. According to whether MMP-9 inhibitor CTK8G1150 was added at the same time (the final concentration was 5.0 mol/L) or not, RPE cells cultured in the two types of mice were respectively set as MMP-9 inhibitor intervention group and non-intervention control group. The cells in each group were treated with the intervention of a solvent, 1 μmol/L adenosine monophosphate (AMP), 1 μmol/L AMP, and 3 μmol/L 5' -α,β-methylene adenosine diphosphate (APCP) (AMP+APCP). The stimulating effect of RPE cells in different groups on CD4+ T cell proliferation was detected by tritiated thymidine incorporation. Adoptive immune induced EAU in wild-type B6 mice and CD73-/- mice, respectively. The receptor mice were randomly divided into the MMP-9 inhibitor intervention group and the non-intervention control group, and CTK8G1150 or the solvent were injected into the subretinal cavity 4, 7 and 10 days after adoptive immunity. CD73 mRNA and protein expression in RPE cells of recipient mice were detected by real-time quantitative PCR (RT-PCR) and Western blot. One-way ANOVA was used to analyze all experimental data.Results When the stimulation mode was AMP, the proliferation of CD4+ T cells in the C57BL/6 MMP-9 inhibitor intervention group decreased significantly compared with the non-intervention group (F=13.28, P<0.01). When the stimulation mode was solvent and AMP+APCP, there was no statistically significant difference in the proliferation capacity of CD4+ T cells between the two groups (F=7.78, 6.58; P>0.05). There was no statistically significant difference in the proliferation capacity of CD4+ T cells between the CD73-/- MMP-9 inhibitor intervention group and the non-intervention group (F=5.24, 6.12, 7.04; P>0.05). RT-PCR results showed that there was no statistically significant difference in the relative expression of CD73 mRNA in RPE cells between the MMP-9 inhibitor group and the non-intervention control group (F=6.54, P>0.05). Western blot results showed that the expression of CD73 protein in RPE cells in the MMP-9 inhibitor group of B6 receptor mice was significantly increased compared with the control group (F=15.24, P<0.01).Conclusion MMP-9 inhibitor blocks CD73 detachment from RPE cells surface and has a protective effect on EAU.

Citation: Zhou Shumin, Kong Fanqiang, Chen Song. Preliminary study on prevention and treatment of experimental autoimmune uveitis by blocking CD73 detachment from the surface of retinal pigment epithelial cells with matrix metalloprotein-9 inhibitor. Chinese Journal of Ocular Fundus Diseases, 2020, 36(4): 289-294. doi: 10.3760/cma.j.cn511434-20180502-00141 Copy

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