Tonicity response element binding protein associated with neuronal cell death in the experimental diabetic retinopathy
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- Tonicity response element binding protein associated with neuronal cell death in the experimental diabetic retinopathy
- Kim, Seong-Jae; Kim, Hwajin; Park, Jeongsook; Chung, Inyoung; Kwon, H. Moo; Choi, Wan-Sung; Yoo, Ji-Myong
- aldose reductase; diabetes; tonicity response element binding protein; retinopathy
- Issue Date
- IJO PRESS
- INTERNATIONAL JOURNAL OF OPHTHALMOLOGY , v.7, no.6, pp.935 - 940
- AIM: To study the contribution of tonicity response element binding protein (TonEBP) in retinal ganglion cell (RGC) death of diabetic retinopathy (DR).
METHODS: Diabetes was induced in C57BL/6 mice by five consecutive intraperitoneal injections of 55 mg/kg streptozotocin (STZ). Control mice received vehicle (phosphate -buffered saline). All mice were killed 2mo after injections, and the extent of cell death and the protein expression levels of TonEBP and aldose reductase (AR) were examined.
RESULTS: The TonEBP and AR protein levels and the death of RGC were significantly increased in the retinas of diabetic mice compared with controls 2mo after the induction of diabetes. Terminal deoxynucleotidyl transferase (TdT) -mediated dUTP nick end labeling (TUNEL) -positive signals co -localized with TonEBP immunoreactive RGC. These changes were increased in the diabetic retinas compared with controls.
CONCLUSION: The present data show that AR and TonEBP are upregulated in the DR and TonEBP may contribute to apoptosis of RGC in the DR.
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