中国病理生理杂志
中國病理生理雜誌
중국병리생리잡지
CHINESE JOURNAL OF PATHOPHYSIOLOGY
2015年
1期
64-68
,共5页
石春花%石明隽%王圆圆%刘丽荣%张昌志%李霜%肖瑛%严瑞%郭兵
石春花%石明雋%王圓圓%劉麗榮%張昌誌%李霜%肖瑛%嚴瑞%郭兵
석춘화%석명준%왕원원%류려영%장창지%리상%초영%엄서%곽병
肾小管上皮细胞%高糖%MG132%SnoN蛋白%Smad泛素化调节因子2%Arkadia蛋白
腎小管上皮細胞%高糖%MG132%SnoN蛋白%Smad汎素化調節因子2%Arkadia蛋白
신소관상피세포%고당%MG132%SnoN단백%Smad범소화조절인자2%Arkadia단백
KEY WORDS] Renal tubular epithelial cells%High glucose%MG132%SnoN protein%Smad ubiquitination regula-tory factor 2%Arkadia protein
目的:观察蛋白酶体抑制剂MG132对高糖培养条件下肾小管上皮细胞核转录共抑制因子SnoN蛋白表达的影响,探讨MG132减轻高糖状态下肾小管纤维化病变的作用及可能机制。方法:将体外培养的NRK-52E细胞分为正常组(NG)、高糖组(HG)和不同浓度MG132预处理后高糖培养组(HG+MG132),采用免疫荧光双染的方法观察E-钙黏蛋白( E-cadherin )和α-平滑肌肌动蛋白(α-SMA )在肾小管上皮细胞中的表达和分布,用Western blotting方法检测SnoN、Samd泛素化调节因子2(Smurf2)、Arkadia、E-cadherin、α-SMA和Ⅰ型胶原(Col-Ⅰ)等目标蛋白的相对表达量。结果:与NG组相比,HG组肾小管上皮细胞E-cadherin和SnoN表达减少(P<0.05),而α-SMA、Col-Ⅰ、Smurf2和Arkadia表达增多( P<0.05);与HG组相比,不同浓度MG132预处理肾小管上皮细胞后高糖培养,可见肾小管上皮细胞中SnoN和E-cadherin蛋白表达显著上调( P<0.05),而α-SMA和Col-Ⅰ蛋白的表达显著下调( P<0.05),并且这种效应呈量效依赖性,但MG132预处理对Smurf2和Arkadia的表达无影响。结论:MG132可对抗高糖介导的肾小管上皮细胞的纤维化效应,其机制可能是通过减少SnoN蛋白的泛素化降解作用实现的。
目的:觀察蛋白酶體抑製劑MG132對高糖培養條件下腎小管上皮細胞覈轉錄共抑製因子SnoN蛋白錶達的影響,探討MG132減輕高糖狀態下腎小管纖維化病變的作用及可能機製。方法:將體外培養的NRK-52E細胞分為正常組(NG)、高糖組(HG)和不同濃度MG132預處理後高糖培養組(HG+MG132),採用免疫熒光雙染的方法觀察E-鈣黏蛋白( E-cadherin )和α-平滑肌肌動蛋白(α-SMA )在腎小管上皮細胞中的錶達和分佈,用Western blotting方法檢測SnoN、Samd汎素化調節因子2(Smurf2)、Arkadia、E-cadherin、α-SMA和Ⅰ型膠原(Col-Ⅰ)等目標蛋白的相對錶達量。結果:與NG組相比,HG組腎小管上皮細胞E-cadherin和SnoN錶達減少(P<0.05),而α-SMA、Col-Ⅰ、Smurf2和Arkadia錶達增多( P<0.05);與HG組相比,不同濃度MG132預處理腎小管上皮細胞後高糖培養,可見腎小管上皮細胞中SnoN和E-cadherin蛋白錶達顯著上調( P<0.05),而α-SMA和Col-Ⅰ蛋白的錶達顯著下調( P<0.05),併且這種效應呈量效依賴性,但MG132預處理對Smurf2和Arkadia的錶達無影響。結論:MG132可對抗高糖介導的腎小管上皮細胞的纖維化效應,其機製可能是通過減少SnoN蛋白的汎素化降解作用實現的。
목적:관찰단백매체억제제MG132대고당배양조건하신소관상피세포핵전록공억제인자SnoN단백표체적영향,탐토MG132감경고당상태하신소관섬유화병변적작용급가능궤제。방법:장체외배양적NRK-52E세포분위정상조(NG)、고당조(HG)화불동농도MG132예처리후고당배양조(HG+MG132),채용면역형광쌍염적방법관찰E-개점단백( E-cadherin )화α-평활기기동단백(α-SMA )재신소관상피세포중적표체화분포,용Western blotting방법검측SnoN、Samd범소화조절인자2(Smurf2)、Arkadia、E-cadherin、α-SMA화Ⅰ형효원(Col-Ⅰ)등목표단백적상대표체량。결과:여NG조상비,HG조신소관상피세포E-cadherin화SnoN표체감소(P<0.05),이α-SMA、Col-Ⅰ、Smurf2화Arkadia표체증다( P<0.05);여HG조상비,불동농도MG132예처리신소관상피세포후고당배양,가견신소관상피세포중SnoN화E-cadherin단백표체현저상조( P<0.05),이α-SMA화Col-Ⅰ단백적표체현저하조( P<0.05),병차저충효응정량효의뢰성,단MG132예처리대Smurf2화Arkadia적표체무영향。결론:MG132가대항고당개도적신소관상피세포적섬유화효응,기궤제가능시통과감소SnoN단백적범소화강해작용실현적。
AIM:To investigate the effects of proteasome inhibitor MG 132 on the expression of SnoN in renal tubule epithelial cells incubated in high glucose , and to explore the possible mechanism and function that MG 132 reduces or slows down renal tubular interstitial injury after incubated in high glucose .METHODS:The NRK-52E cells were divid-ed into normal control group (NG), high glucose group (HG) and high glucose plus pretreatment with different doses of MG132 group (HG+MG132).The immunofluorescence staining was used to detect the protein expression of E-cadherin and α-smooth muscle actin (α-SMA) in NRK-52E cells under different conditions .The relative protein expression levels of SnoN, Smad ubiquitination regulatory factor 2 (Smurf2), Arkadia, E-cadherin, α-SMA and collagen type Ⅰ(Col-Ⅰ) were detected by Western blotting .RESULTS:Compared with NG group , the expression of E-cadherin and SnoN was de-creased (P<0.05), while the expression of α-SMA, Col-Ⅰ, Smurf2 and Arkadia was increased (P<0.05).Compared with HG group, the protein expression of SnoN and E-cadherin was significantly up-regulated in HG+MG132 group ( P<0.05 ) , and the protein expression of α-SMA and Col-Ⅰwas significantly down-regulated in a dose-depended manner ( P<0.05).However, no effect on the protein expression of Smurf2 and Arkadia was observed.CONCLUSION: MG132 in-hibits the degradation of SnoN protein induced by high glucose , thus reducing the renal fibrosis .