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Curcumin suppresses oxidative stress via regulation of ROS/NF-κB signaling pathway to protect retinal vascular endothelial cell in diabetic retinopathy

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Abstract

Background

The retinal vascular endothelial cells can be damaged by oxidative stress even in the early stage of diabetic retinopathy (DR). This study aimed to investigate the protective effect of curcumin on the rat retinal vascular endothelial cells (RRVECs) in high glucose circumstance.

Objective

The cultured RRVECs were identified and characterized by both of vWF and CD31 immunofluorescence expression. The activation of ROS/NF-κB signal pathway was examined by electrophoretic Mobility Shift Assay (EMSA), immunohistochemistry and Western blot; the apoptosis of RRVECs was tested by flow cytometry.

Results

We found that curcumin reduced the reactive oxygen species (ROS) and relieved the apoptosis in RRVECs exposed to the high glucose by flow cytometry. It was revealed that the increased activity of NF-κB and phosphorylated NF-κB in RRVECs induced by high glucose concentration was significantly suppressed by curcumin.

Conclusion

We concluded that curcumin could suppress the oxidative stress via regulation of NF-κB signal to protect the RRVECs in DR.

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Acknowledgements

This work was supported by Jiangsu Province Traditional Chinese Medicine Science and Technology Development Program Project(YB2020060); the Second affiliated hospital of Soochow University Research fund project (SDFEYBS1903 and SDFEYBS1914); National Natural Science Foundation of China (No. 81671270); the Second affiliated hospital of Soochow University preponderant clinic discipline group project funding (XKQ2015002).

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Authors

Contributions

In this work, JH, YL and QY conceived the study and designed the experiments. JH, YL, QY,YC and TN performed the experiments. YC and GX contributed to the data collection; JZ, TN, XJ,WZ and YY performed the data analysis and interpreted the results. JH and WL wrote the manuscript; WL contributed to the critical revision of article.

Corresponding author

Correspondence to Weifeng Luo.

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Conflict of interest

Jiang Huang, Quanyong Yi, Yuhong You,Yao Chen, Tongtong Niu, Yi Li, Ji Zhang, Xiaoyan Ji, Guoxu Xu, Weijie Zou,Fangfang Ji and Weifeng Luo declare that they have no conflict of interest.

Ethics approval

All animal experiments were conducted following the guidelines of China Council on Animal Care and Use. The study was approved by the Ethical Committee of the Second affiliated Hospital of Soochow University.

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Huang, J., Yi, Q., You, Y. et al. Curcumin suppresses oxidative stress via regulation of ROS/NF-κB signaling pathway to protect retinal vascular endothelial cell in diabetic retinopathy. Mol. Cell. Toxicol. 17, 367–376 (2021). https://doi.org/10.1007/s13273-021-00144-7

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