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The retinal pigment epithelial response after retinal laser photocoagulation in diabetic mice

  • Sun Young Jang
  • In Hwan Cho
  • Jin Young Yang
  • Ha Yan Park
  • Sang Earn Woo
  • Sanjar Batirovich Madrakhimov
  • Hun Soo Chang
  • Jungmook Lyu
  • Tae Kwann Park
Original Article
  • 29 Downloads

Abstract

To investigate the characteristics of regenerated retinal pigment epithelial (RPE) cells after retinal laser photocoagulation in diabetic mice. C57BL/6J mice were used to induce diabetes using intraperitoneal injection of streptozotocin. The proliferation of RPE cells after laser photocoagulation was determined using the 5-ethynyl-2′-deoxyuridine (EdU) assay in both diabetic and wild-type mice. The morphological changes of RPE cells were evaluated by using Voronoi diagram from immunostaining for ß-catenin. Characteristics of regenerated cells were evaluated by quantifying the mRNA and protein levels of RPE and epithelial-mesenchymal transition (EMT) markers. There were significantly less EdU-positive cells in laser-treated areas in diabetic mice than wild-type mice. Hexagonality was extensively lost in diabetic mice. Many EdU-positive cells were co-localized with Otx2-positive cells in the center of the laser-treated areas in wild-type mice, but only EdU-positive cells were widely distributed in diabetic mice. Quantitative analysis of mRNA and protein levels showed that the expression levels of RPE markers, Pax6, Mitf, and Otx2, were significantly decreased in RPE of diabetic mice compared with that of wild-type mice, whereas the expression levels of EMT markers, vimentin and fibronectin, were significantly increased. The proliferation and hexagonality of regenerating RPE cells were impaired after laser photocoagulation, and the regenerated RPE cells lost their original properties in diabetic mice. Further clinical research is needed to elucidate the RPE response after laser photocoagulation in diabetic patients.

Keywords

Diabetic mouse Laser photocoagulation Retinal pigment epithelium 

Notes

Funding information

This study was supported by grants from the Basic Science Research Program through the National Research Foundation of Korea (NRF) (No. 2016R1A2B4008376; Seoul, Republic of Korea). This work was partially supported by the Soonchunhyang University Research Fund. The funding organization had no role in the design or conducted of this research.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethics approval

The Animal Care Committee of Soonchunhyang University Bucheon Hospital.

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Ophthalmology, Soonchunhyang University Hospital BucheonSoonchunhyang University College of MedicineBucheon-siSouth Korea
  2. 2.Department of Ophthalmology, College of MedicineSoonchunhyang UniversityCheonan-siSouth Korea
  3. 3.Department of OphthalmologySoonchunhyang University Hospital CheonanCheonan-siSouth Korea
  4. 4.Research center for clinical medicineSoonchunhyang University Hospital BucheonBucheon-siSouth Korea
  5. 5.Department of Interdisciplinary Program in Biomedical Science Major, Graduate SchoolSoonchunhyang UniversityBucheon-siSouth Korea
  6. 6.Department of Medical ScienceKonyang UniversityDaejeonSouth Korea

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