Abstract
Purpose
The Janus tyrosine kinase and signal transducers and activators of transcription (JAK/STAT) pathway is involved in vascular endothelial growth factor (VEGF) expression, but the role of this pathway in diabetic retinopathy (DR) remains unclear. We investigated the role of the JAK/STAT pathway on DR and VEGF expression using a streptozotocin (STZ)-induced DR mouse model.
Methods
Cultured ARPE-19 cells were exposed to high-glucose conditions and treated with JAK/STAT inhibitors (JAK inhibitor I [JAKiI], tofacitinib, STAT3 inhibitor [STAT3i]) for 48 h. Reverse-transcription polymerase chain reaction, western blotting, and enzyme-linked immunosorbent assay were used to investigate p-JAK/STAT and VEGF expression. Diabetes was induced by intraperitoneal injection of STZ (50 mg/kg) in C57BL/6 mice for 5 days. DR development was evaluated every 4 weeks. JAK/STAT inhibitors were administered for 8 weeks. Immunofluorescence was used to measure the activation status of the JAK/STAT pathway and VEGF production in the retinal tissue.
Results
In ARPE-19 cells exposed to high-glucose conditions, the mRNA and secretory protein levels of VEGF, p-JAK1, p-JAK2, p-STAT3, and p-STAT5 levels were significantly increased. Treatment with JAKiI, tofacitinib, and STAT3i significantly suppressed VEGF to basal levels at both the mRNA and secretory levels in vitro. In STZ-induced mice, retinal vascular leakage, p-JAK1, p-JAK2, p-JAK3, p-STAT3, and VEGF were significantly increased after diabetes induction. Diabetes-induced retinal vascular leakage was significantly reduced by treatment with JAKiI and tofacitinib. Increased p-JAK1 and VEGF in STZ-induced mice were significantly reduced by JAKiI (p < 0.05, p < 0.001) and tofacitinib (p < 0.001, respectively).
Conclusion
JAK1 may be more involved in VEGF production and DR progression in mice than JAK2, JAK3, and STAT3.
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Data availability
Yes.
Code availability
Not applicable.
Abbreviations
- DR:
-
Diabetic retinopathy
- JAK:
-
Janus tyrosine kinase
- PCR:
-
Polymerase chain reaction
- RPE:
-
Retinal pigment epithelium
- STAT:
-
Signal transducers and activators of transcription
- STZ:
-
Streptozotocin
- VEGF:
-
Vascular endothelial growth factor
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Funding
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (No.: NRF-2017R1D1A1B03033799).
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All experimental procedures were approved by the Institutional Animal Care and Use Committee of Inje University (protocol no. 2017–011) and adhered to the Association for Research in Vision and Ophthalmology statement for the Use of Animals in Ophthalmic and Vision Research.
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Cho, CH., Roh, KH., Lim, NY. et al. Role of the JAK/STAT pathway in a streptozotocin-induced diabetic retinopathy mouse model. Graefes Arch Clin Exp Ophthalmol 260, 3553–3563 (2022). https://doi.org/10.1007/s00417-022-05694-7
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DOI: https://doi.org/10.1007/s00417-022-05694-7