中国癌症杂志
中國癌癥雜誌
중국암증잡지
CHINA ONCOLOGY
2015年
3期
161-166
,共6页
倪晓辰%赵志红%马永良%任宗涛%刘彬%张爱莉
倪曉辰%趙誌紅%馬永良%任宗濤%劉彬%張愛莉
예효신%조지홍%마영량%임종도%류빈%장애리
miR-222%肾癌%DDIT4%自噬
miR-222%腎癌%DDIT4%自噬
miR-222%신암%DDIT4%자서
miR-222%Renal cell carcinoma%DDIT4%Autophagy
背景与目的:微小RNA(microRNA,miRNA,miR)在肿瘤的发生、发展中具有重要的作用。miR-222在多种肿瘤组织中表达上调,而其在肾癌(renal cell carcinoma,RCC)中的表达及其作用机制尚不清楚。本研究拟通过检测RCC组织及相应癌旁组织中miR-222的表达情况,探讨miR-222在RCC中的作用。并在体外条件下,通过检测miR-222的下游作用靶点,探讨miR-222的抗RCC作用机制。方法:采用实时定量聚合酶链反应(quantitative real-time polymerase chain reaction,qRT-PCR)检测RCC组织和癌旁组织中miR-222的表达;采用CCK-8法检测细胞的增殖活力;采用蛋白[质]印迹法(Western blot)检测DDIT4蛋白及LC3-Ⅱ的表达;采用荧光素酶实验验证miR-222的作用靶点;转染EGFP-LC3后在激光共聚焦显微镜下观察细胞自噬状态。结果:qRT-PCR检测结果显示,miR-222在RCC组织中表达明显上调。在人肾透明细胞癌786-O细胞株中敲低miR-222表达后显著抑制细胞的增殖活力,而过表达miR-222可增强786-O细胞的增殖活力(P<0.01)。在786-O细胞中敲低miR-222后,其靶基因DDIT4蛋白的表达显著上调,过表达miR-222后,DDIT4表达明显下调。荧光素酶实验结果表明,DDIT4为miR-222的直接作用靶点。RCC组织的DDIT4表达下调。在786-O细胞中抑制miR-222表达后,LC3-Ⅱ的表达水平显著上调,自噬体数目显著增加。结论:miR-222在RCC中高表达,并可能通过靶向抑制DDIT4的表达参与调控RCC细胞自噬。
揹景與目的:微小RNA(microRNA,miRNA,miR)在腫瘤的髮生、髮展中具有重要的作用。miR-222在多種腫瘤組織中錶達上調,而其在腎癌(renal cell carcinoma,RCC)中的錶達及其作用機製尚不清楚。本研究擬通過檢測RCC組織及相應癌徬組織中miR-222的錶達情況,探討miR-222在RCC中的作用。併在體外條件下,通過檢測miR-222的下遊作用靶點,探討miR-222的抗RCC作用機製。方法:採用實時定量聚閤酶鏈反應(quantitative real-time polymerase chain reaction,qRT-PCR)檢測RCC組織和癌徬組織中miR-222的錶達;採用CCK-8法檢測細胞的增殖活力;採用蛋白[質]印跡法(Western blot)檢測DDIT4蛋白及LC3-Ⅱ的錶達;採用熒光素酶實驗驗證miR-222的作用靶點;轉染EGFP-LC3後在激光共聚焦顯微鏡下觀察細胞自噬狀態。結果:qRT-PCR檢測結果顯示,miR-222在RCC組織中錶達明顯上調。在人腎透明細胞癌786-O細胞株中敲低miR-222錶達後顯著抑製細胞的增殖活力,而過錶達miR-222可增彊786-O細胞的增殖活力(P<0.01)。在786-O細胞中敲低miR-222後,其靶基因DDIT4蛋白的錶達顯著上調,過錶達miR-222後,DDIT4錶達明顯下調。熒光素酶實驗結果錶明,DDIT4為miR-222的直接作用靶點。RCC組織的DDIT4錶達下調。在786-O細胞中抑製miR-222錶達後,LC3-Ⅱ的錶達水平顯著上調,自噬體數目顯著增加。結論:miR-222在RCC中高錶達,併可能通過靶嚮抑製DDIT4的錶達參與調控RCC細胞自噬。
배경여목적:미소RNA(microRNA,miRNA,miR)재종류적발생、발전중구유중요적작용。miR-222재다충종류조직중표체상조,이기재신암(renal cell carcinoma,RCC)중적표체급기작용궤제상불청초。본연구의통과검측RCC조직급상응암방조직중miR-222적표체정황,탐토miR-222재RCC중적작용。병재체외조건하,통과검측miR-222적하유작용파점,탐토miR-222적항RCC작용궤제。방법:채용실시정량취합매련반응(quantitative real-time polymerase chain reaction,qRT-PCR)검측RCC조직화암방조직중miR-222적표체;채용CCK-8법검측세포적증식활력;채용단백[질]인적법(Western blot)검측DDIT4단백급LC3-Ⅱ적표체;채용형광소매실험험증miR-222적작용파점;전염EGFP-LC3후재격광공취초현미경하관찰세포자서상태。결과:qRT-PCR검측결과현시,miR-222재RCC조직중표체명현상조。재인신투명세포암786-O세포주중고저miR-222표체후현저억제세포적증식활력,이과표체miR-222가증강786-O세포적증식활력(P<0.01)。재786-O세포중고저miR-222후,기파기인DDIT4단백적표체현저상조,과표체miR-222후,DDIT4표체명현하조。형광소매실험결과표명,DDIT4위miR-222적직접작용파점。RCC조직적DDIT4표체하조。재786-O세포중억제miR-222표체후,LC3-Ⅱ적표체수평현저상조,자서체수목현저증가。결론:miR-222재RCC중고표체,병가능통과파향억제DDIT4적표체삼여조공RCC세포자서。
Background and purpose:MicroRNA (miRNA, miR) plays an important regulatory role in cancer. miR-222 is reported to be up-regulated in various tumors, but its role in renal cell carcinoma (RCC) remains unclear. In this study, we detected the expression of miR-222 in both RCC and adjacent tissue samples. The aim of this study was to investigate the role of miR-222 in RCC. Methods:The expression levels of miR-222 in RCC tissue samples were quantified by quantitative real-time polymerase chain reaction (qRT-PCR). DDIT4 and LC3-Ⅱ protein expressions were determined by Western blot. Dual luciferase assay was performed to verify the target of miR-222. EGFP-LC3 microscopy assay was performed to assess autophagy. Results:Results from qRT-PCR showed that the expression of miR-222 was up-regulated in RCC tissues. Knockdown of miR-222 with speciifc antagomiR decreased the cell viability of 786-O cells, whereas overexpression of miR-222 increased the cell viability (P<0.01). The levels of DDIT4 were up-regulated in 786-O cells transfected with miR-222 antagomiR, whereas overexpression of miR-222 induced the down-regulation of DDIT4 expression. Data from dual luciferase assay indicated that miR-222 directly targeted the expression of DDIT4. Consistently, the expression of DDIT4 in RCC tissues was down-regulated compared with adjacent tissues. Knockdown of miR-222 in 786-O cells induced a signiifcant increase of autophagosome formation and LC3 lipidation.These results supported that miR-222 could inhibit autophagy in RCC cells, which may affect the clinical characteristcs of RCC. Conclusion: miR-222 is up-regulated in RCC and can inhibit the autophagy of RCC cells through down-regulating the expression of DDIT4.