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Mesenchymal stem cells attenuate hydrogen peroxide-induced oxidative stress and enhance neuroprotective effects in retinal ganglion cells

  • Yi Cui
  • Nuo Xu
  • Wei Xu
  • Guoxing Xu
Article

Abstract

The apoptosis of retinal ganglion cells leads to visual impairment and blindness in ocular neurodegenerative diseases, especially in diabetic retinopathy (DR). Mounting evidence suggests that oxidative stress contributes to the pathogenesis of DR. In the present study, we investigated whether bone mesenchymal stem cells (BMSCs) have protective ability to relieve hydrogen peroxide (H2O2)-induced injury on retinal ganglion cells in vitro. An immortalized retinal ganglion cells, RGC-5 cells, were exposed to an indicated concentration of H2O2 for 24 h. Cell viability was analyzed by CCK-8 assay to find out a certain concentration to build H2O2 oxidative damage model. Morphological changes in RGC-5 cells were observed under optical microscope, and cell apoptosis was detected with Hoechst fluorescence staining. Then, BMSCs were co-cultured with RGC-5 cells in a transwell culture system for 24 h and 48 h. Flow cytometry was performed to qualify the apoptosis rate of RGC-5 cells. Conditioned medium was collected for evaluation the inflammatory cytokines by ELISA. The content of intracellular malondialdehyde (MDA) and superoxide dismutase (SOD) was assayed by thiobarbituric acid and xanthine oxidase method, respectively. qRT-PCR and ELISA were conducted for analysis of the expression changes in brain-derived neurotrophic factor (BDNF) and ciliary neurotrophic factor (CNTF), respectively. After H2O2 exposure, the morphological varieties were observed as cytoplasm shrinking and paramorphia together with nuclear gathering. Meanwhile, the apoptotic cells had hyperfluorescence with Hoechst 33258 staining. Co-culture with BMSCs significantly inhibited retinal cell death. It was found that BMSCs reduced H2O2-induced inflammatory factors IL-1β and TNF-α, down-regulated intracellular oxidant factor MDA, up-regulated intracellular antioxidant factor SOD, and increased neurotrophins BDNF and CNTF expression. BMSCs may enhance protective effect of RGC-5 cells in H2O2-induced damage through improving antioxidant capacity, inhibiting pro-inflammatory cytokine secretion, and promoting neurotrophin expression.

Keywords

Mesenchymal stem cells Retinal ganglion cells Hydrogen peroxide Protective effect 

Notes

Acknowledgements

This work was supported by the Chinese Nature Science Foundation (grant no. 81070715). The authors would like to acknowledge the State Key Laboratory of Ophthalmology, Zhongshan Opthalmic Center (Sun Yat-sen University) for their help to offer RGC-5 cells.

Compliance with ethical standards

Competing interests

The authors declare that they have no competing interests.

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Copyright information

© The Society for In Vitro Biology 2016

Authors and Affiliations

  1. 1.Department of OphthalmologyFujian Medical University Union HospitalFuzhouChina
  2. 2.Department of OphthalmologyFujian Provincial HospitalFuzhouChina
  3. 3.Department of Ophthalmology, Fujian Institute of OphthalmologyThe first Affiliated Hospital of Fujian Medical UniversityFuzhouChina

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