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Identification of effective siRNA against K-ras in human pancreatic cancer cell line MiaPaCa-2 by siRNA expression cassette

查看全文 作　　者：[1]WeiWang;Chun-[1]YouWang;Ju-[2]HuaDong;[3]XiongChen;[4]MinZhang;[1]GangZhao 高影响力作者 机构地区：[1]DepartmentofPancreasSurgeryCenter,XieheHospital,TongjiMedicalCollege,HuazhongUniversityofScienceandTechnology,Wuhan430022,HubeiProvince,China;[2]DepartmentofCenterLab,XieheHospital,TongjiMedicalCollege,HuazhongUniversityofScienceandTechnology,Wuhan430022,HubeiProvince,China;[3]DepartmentofENT,XieheHospital,longj1MedicalCollege,HuazhongUniversityofScienceandTechnology,Wuhan430022,HubeiProvince,China;[4]DepartmentofNeurology,XieheHospital,TongjiMedicalCollege,HuazhongUniversityofScienceandTechnology,Wuhan430022,HubeiProvince,China高影响力机构 出　　处：《World Journal of Gastroenterology》索引2005年第11卷第13期,共6页高影响力期刊 摘　　要：AIM: We shall construct the small interfering RNA (siRNA)expression cassette (SEC) targeting activated K-ras gene sequence, identify more effective siRNA sequence against K-ras gene in human pancreatic cancer cell line MiaPaCa-2 by SEC and reveal the anti-cancer effects of RNA interference (RNAi) and its therapeutic possibilities.WETHODS: Three different sites of SECs were constructed by PCR. K1/siRNA, K2/siRNA and K3/siRNA are located at sites 194, 491 and 327, respectively. They were transfected into MiaPaCa-2 cells by liposome to inhibit the expression of activated K-ras. In the interfering groups of sites 194 and 491, we detected the apoptosis in cells by FACS after they were incubated for 48 h, then we tested the alternation of K-ras gene in MiaPaCa-2 cells by RT-PCR immunofluorescence, respectively.RESULTS: Introduction of the K1/siRNA and K2/siRNA against K-ras into MiaPaCa-2 cells leads to increased apoptosis, and the number of apoptotic cells is increased compared with control cells. The tests of RT-PCR immunofluorescence show the effects of inhibiting expression of activated K-ras gene by RNA interference in the K1/siRNA and K2/siRNA groups. We also find that the introduction of K3/siRNA has no effect on MiaPaCa-2 cells.CONCLUSION: K1/siRNA and K2/siRNA can inhibit the expression of activated K-fas but K3/siRNA has no effect,demonstrating that K1/siRNA and K2/siRNA are effective sequences against K-ras gene and K3/siRNA are not. We conclude that specific siRNA against K-ras expression may be a powerful tool to be used therapeutically against human pancreatic cancer. 关 键 词：SIRNA K-RAS 胰腺肿瘤 肿瘤细胞 MIAPACA-2 基因表达
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