BACKGROUND Diabetic macular edema(DME)is the most common cause of vision loss in people with diabetes.Tight junction disruption of the retinal pigment epithelium(RPE)cells has been reported to induce DME development.S...BACKGROUND Diabetic macular edema(DME)is the most common cause of vision loss in people with diabetes.Tight junction disruption of the retinal pigment epithelium(RPE)cells has been reported to induce DME development.SMAD-specific E3 ubiquitin protein ligase(SMURF)1 was associated with the tight junctions of cells.However,the mechanism of SMURF1 in the DME process remains unclear.AIM To investigate the role of SMURF1 in RPE cell tight junction during DME.METHODS ARPE-19 cells treated with high glucose(HG)and desferrioxamine mesylate(DFX)for establishment of the DME cell model.DME mice models were constructed by streptozotocin induction.The trans-epithelial electrical resistance and permeability of RPE cells were analyzed.The expressions of tight junction-related and autophagy-related proteins were determined.The interaction between insulin like growth factor 2 mRNA binding protein 2(IGF2BP2)and SMURF1 mRNA was verified by RNA immunoprecipitation(RIP).SMURF1 N6-methyladenosine(m6A)level was detected by methylated RIP.RESULTS SMURF1 and vascular endothelial growth factor(VEGF)were upregulated in DME.SMURF1 knockdown reduced HG/DFX-induced autophagy,which protected RPE cell tight junctions and ameliorated retinal damage in DME mice.SMURF1 activated the Wnt/β-catenin-VEGF signaling pathway by promoting WNT inhibitory factor(WIF)1 ubiquitination and degradation.IGF2BP2 upregulated SMURF1 expression in an m6A modification-dependent manner.CONCLUSION M6A-modified SMURF1 promoted WIF1 ubiquitination and degradation,which activated autophagy to inhibit RPE cell tight junctions,ultimately promoting DME progression.展开更多
目的:分析人乳头瘤病毒16型E6蛋白(Human papillomavirus type 16 E6 protein,HPV16-E6)、细胞分化抑制因子-1(Inhibitor of intracellular differentiation-1,ID-1)及脯氨酰顺反异构酶1(Prolylcis-trans isomerase1,Pin1)在宫颈癌组织...目的:分析人乳头瘤病毒16型E6蛋白(Human papillomavirus type 16 E6 protein,HPV16-E6)、细胞分化抑制因子-1(Inhibitor of intracellular differentiation-1,ID-1)及脯氨酰顺反异构酶1(Prolylcis-trans isomerase1,Pin1)在宫颈癌组织中的表达及相关性。方法:选择2017年3月至2022年3月莆田学院附属医院收治的宫颈癌65例,所有患者均在我院进行手术切除癌组织,并留取宫颈癌组织和距离癌组织边缘2 cm以上癌旁组织。通过免疫组化法对癌组织、癌旁组织标本HPV16-E6、ID-1、Pin1阳性表达率进行检测。分析HPV16-E6、ID-1、Pin1与临床特征的关系。结果:与癌旁组织相比,癌组织中HPV16-E6、ID-1、Pin1阳性率较高(P<0.05)。HPV16-E6、ID-1、Pin1与肌层浸润深度、组织学分级、临床分期、淋巴结转移、肿瘤直径呈正相关(P<0.05)。将年龄、病理类型等因素控制后,HPV16-E6、ID-1、Pin1与肌层浸润深度、组织学分级、临床分期、淋巴结转移、肿瘤直径相关(P<0.05)。结论:HPV16-E6、ID-1、Pin1在宫颈癌患者中均呈高表达,且HPV16-E6、ID-1、Pin1与宫颈癌患者肌层浸润深度、组织学分级、临床分期、淋巴结转移、肿瘤直径相关。展开更多
基金Supported by Natural Science Foundation of Guangdong Province,No.2022A1515012346.
文摘BACKGROUND Diabetic macular edema(DME)is the most common cause of vision loss in people with diabetes.Tight junction disruption of the retinal pigment epithelium(RPE)cells has been reported to induce DME development.SMAD-specific E3 ubiquitin protein ligase(SMURF)1 was associated with the tight junctions of cells.However,the mechanism of SMURF1 in the DME process remains unclear.AIM To investigate the role of SMURF1 in RPE cell tight junction during DME.METHODS ARPE-19 cells treated with high glucose(HG)and desferrioxamine mesylate(DFX)for establishment of the DME cell model.DME mice models were constructed by streptozotocin induction.The trans-epithelial electrical resistance and permeability of RPE cells were analyzed.The expressions of tight junction-related and autophagy-related proteins were determined.The interaction between insulin like growth factor 2 mRNA binding protein 2(IGF2BP2)and SMURF1 mRNA was verified by RNA immunoprecipitation(RIP).SMURF1 N6-methyladenosine(m6A)level was detected by methylated RIP.RESULTS SMURF1 and vascular endothelial growth factor(VEGF)were upregulated in DME.SMURF1 knockdown reduced HG/DFX-induced autophagy,which protected RPE cell tight junctions and ameliorated retinal damage in DME mice.SMURF1 activated the Wnt/β-catenin-VEGF signaling pathway by promoting WNT inhibitory factor(WIF)1 ubiquitination and degradation.IGF2BP2 upregulated SMURF1 expression in an m6A modification-dependent manner.CONCLUSION M6A-modified SMURF1 promoted WIF1 ubiquitination and degradation,which activated autophagy to inhibit RPE cell tight junctions,ultimately promoting DME progression.