Down-regulation of interphotoreceptor retinoid-binding protein and up-regulation of recoverin expression in rats with N-methyl-N-nitrosourea-induced retinal damages
10.3760/cma.j.issn.1005-1015.2013.05.014
- VernacularTitle:N-甲基-N亚硝脲诱导的大鼠视网膜损伤过程中光感受器间维生素A类结合蛋白和恢复蛋白的达达变化
- Author:
Yang GAO
;
Xinguo DENG
;
Na LI
- Publication Type:Journal Article
- Keywords:
Retinal Diseases/physiopathology;
Methylnitrosourea/poisoning;
Carrier proteins;
Recoverin
- From:
Chinese Journal of Ocular Fundus Diseases
2013;29(5):505-509
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effect of N-methyl-N-nitrosourea (MNU) on expressions of interphotoreceptor retinoid-binding protein (IRBP) and recoverin in rat retinal.Methods Thirty female Sprague-Dawley (SD) rats were randomly divided into five groups,including normal control group,and MNU treatment one day,three days,seven days and 10 days groups,each group had six rats.Rats in MNU-treatment groups received a single intraperitoneal injection of 40 mg /kg MNU,while rats in the normal control group received intraperitoneal injection of saline 5 ml/kg.Reverse transcription-polymerase chain reaction (RT-PCR) and immunofluorescence were used to detect the retinal expression of IRBP and recoverin.Results RT-PCR results indicated that retinal IRBP levels decreased after MNU injection compared with normal control (P＜0.01),while recoverin levels increased (one day:P＞0.05; three days:P＜0.05; seven days:P＜0.5; 10 days:P＜0.05).Immunofluorescence assays demonstrated that normally IRBP protein is mainly in the inner and outer segments of photoreceptors.After MNU treatment,IRBP protein was detected in all retinal layers but much faint.Recoverin was expressed in the inner nuclear layer,inner plexiform layer and ganglion cell layer,and its expression was increased after MNU injection.Conclusion MNU suppresses IRBP expression and promotes recoverin expression in rat retina.
