AIM: To investigate the in vitro antitumor effect of adenovirus-mediated small interfering RNAs (siRNAs) on pancreatic cancer and the associated mechanism. METHODS: A 63-nucleotide (nt) oligonucleotide encoding K-rasv...AIM: To investigate the in vitro antitumor effect of adenovirus-mediated small interfering RNAs (siRNAs) on pancreatic cancer and the associated mechanism. METHODS: A 63-nucleotide (nt) oligonucleotide encoding K-rasval12 and specific siRNA were introduced into pSilencer 3.1-H1, then the H1-RNA promoter and siRNA coding insert were subcloned into pAdTrack to get plasmid pAdTrackH1-Avasval12. After homologous recombination in bacteria and transfections of such plasmids into a mammalian packaging cell line 293, siRNA expressing adenovirus Adh1-K-rasval12 was obtained. Stable suppression of K-rasval12 was detected by Northern blot and Western blot. Apoptosis in Panc-1 cells was detected by flow cytometry. RESULTS: We obtained adenovirus AdHl-K-rasval12 carrying the pSilencer 3.1-H1 cassette, which could mediate gene silencing. Through siRNA targeted K-rasval12, the oncogenic phenotype of cancer cells was reversed. Flow cytometry showed that apoptotic index of Panc-1 cells was significantly higher in the AdH1-K-rasval12-treatment group (18.70% at 72 h post-infection, 49.55% at 96 h post-infection) compared to the control groups (3.47%, 3.98% at 72 and 96 h post-infection of AdH1-empty, respectively; 4.21%, 3.78% at 72 and 96 h post-infection of AdHl-p53, respectively) (P<0.05). CONCLUSION: These results demonstrate that adenoviral vectors can be used to mediate RNA interference (RNAi) to induce persistent loss of functional phenotypes. In gene therapy, the selective down-regulation of only the mutant version of a gene allows for highly specific effects on tumor cells, while leaving the normal cells untouched. In addition, the apoptosis of pancreatic cancer cell line Panc-1 can be induced after AdH1-K-rasval12 infection. This kind of adenovirus based on RNAi might be a promising vector for cancer therapy.展开更多
OBJECTIVE To explore the role （HIF-1α） in the proliferation and cells under hypoxic conditions. of hypoxic inducible factor-1α apoptosis of pancreatic cancer METHODS A cassette encoding small interference RNA （si...OBJECTIVE To explore the role （HIF-1α） in the proliferation and cells under hypoxic conditions. of hypoxic inducible factor-1α apoptosis of pancreatic cancer METHODS A cassette encoding small interference RNA （siRNA） targeting HIF-1α mediated by recombinant adeno-associated virus （rAAV） was constructed, giving rAAV-siHIE rAAV-siHIF or rAAV- hrGFP was transfected into exponentially growing MiaPaCa2 cells under hypoxic conditions. Then, the expression of HIF-1α mRNA and protein, the proliferation and apoptosis of MiaPaCa2 cells were examined, using real-time PCR, Western Blot, MTT and TUNEL, respectively. RESULTS Under hypoxic conditions, rAAV-siHIF inhibited the expression of HIF-1α mRNA and protein in MiaPaCa2 cells. At the same time, rAAV-siHIF decreased MiaPaCa2 cell proliferation and induced apoptosis. However, rAAV-hrGFP had no effect on the expression of HIF-1α as well as the proliferation and apoptosis of MiaPaCa2 cells under hypoxic conditions. CONCLUSION Under hypoxic conditions, HIF-1α plays a key role in the proliferation of MiaPaCa2 cells, and inhibition of HIF- 1α expression can lead to MiaPaCa2 cell apoptosis.展开更多
目的:构建表达端粒重复序列结合因子2(TRF2)基因小干扰RNA(siRNA-TRF2)的腺病毒表达载体(rAd-shRNA-TRF2),并检测该载体对人乳腺癌(MCF-7)细胞TRF2基因表达的沉默效应。方法:采用同源重组法构建重组腺病毒rAd-shRNA-TRF2表达载体,鉴定...目的:构建表达端粒重复序列结合因子2(TRF2)基因小干扰RNA(siRNA-TRF2)的腺病毒表达载体(rAd-shRNA-TRF2),并检测该载体对人乳腺癌(MCF-7)细胞TRF2基因表达的沉默效应。方法:采用同源重组法构建重组腺病毒rAd-shRNA-TRF2表达载体,鉴定正确后转染MCF-7细胞,用FQ-RT-PCR和Western blot检测转染后48 h TRF2基因的表达,MTT法和克隆形成实验检测细胞生长状况。结果:重组腺病毒rAd-shRNA-TRF2包装成功,转染MCF-7细胞后,TRF2基因的表达明显被抑制,细胞生长显著抑制,细胞克隆形成能力显著下降。结论:腺病毒介导的TRF2 RNAi表达载体rAd-shRNA-TRF2构建成功,可有效抑制人乳腺癌MCF-7细胞TRF2基因的表达,抑制细胞生长。展开更多
基金Supported by National Natural Science Foundation of China, No.30271473
文摘AIM: To investigate the in vitro antitumor effect of adenovirus-mediated small interfering RNAs (siRNAs) on pancreatic cancer and the associated mechanism. METHODS: A 63-nucleotide (nt) oligonucleotide encoding K-rasval12 and specific siRNA were introduced into pSilencer 3.1-H1, then the H1-RNA promoter and siRNA coding insert were subcloned into pAdTrack to get plasmid pAdTrackH1-Avasval12. After homologous recombination in bacteria and transfections of such plasmids into a mammalian packaging cell line 293, siRNA expressing adenovirus Adh1-K-rasval12 was obtained. Stable suppression of K-rasval12 was detected by Northern blot and Western blot. Apoptosis in Panc-1 cells was detected by flow cytometry. RESULTS: We obtained adenovirus AdHl-K-rasval12 carrying the pSilencer 3.1-H1 cassette, which could mediate gene silencing. Through siRNA targeted K-rasval12, the oncogenic phenotype of cancer cells was reversed. Flow cytometry showed that apoptotic index of Panc-1 cells was significantly higher in the AdH1-K-rasval12-treatment group (18.70% at 72 h post-infection, 49.55% at 96 h post-infection) compared to the control groups (3.47%, 3.98% at 72 and 96 h post-infection of AdH1-empty, respectively; 4.21%, 3.78% at 72 and 96 h post-infection of AdHl-p53, respectively) (P<0.05). CONCLUSION: These results demonstrate that adenoviral vectors can be used to mediate RNA interference (RNAi) to induce persistent loss of functional phenotypes. In gene therapy, the selective down-regulation of only the mutant version of a gene allows for highly specific effects on tumor cells, while leaving the normal cells untouched. In addition, the apoptosis of pancreatic cancer cell line Panc-1 can be induced after AdH1-K-rasval12 infection. This kind of adenovirus based on RNAi might be a promising vector for cancer therapy.
基金supported by a grant from Nature Science Foundation of Tianjin,China(No.05YFSYSF01300).
文摘OBJECTIVE To explore the role （HIF-1α） in the proliferation and cells under hypoxic conditions. of hypoxic inducible factor-1α apoptosis of pancreatic cancer METHODS A cassette encoding small interference RNA （siRNA） targeting HIF-1α mediated by recombinant adeno-associated virus （rAAV） was constructed, giving rAAV-siHIE rAAV-siHIF or rAAV- hrGFP was transfected into exponentially growing MiaPaCa2 cells under hypoxic conditions. Then, the expression of HIF-1α mRNA and protein, the proliferation and apoptosis of MiaPaCa2 cells were examined, using real-time PCR, Western Blot, MTT and TUNEL, respectively. RESULTS Under hypoxic conditions, rAAV-siHIF inhibited the expression of HIF-1α mRNA and protein in MiaPaCa2 cells. At the same time, rAAV-siHIF decreased MiaPaCa2 cell proliferation and induced apoptosis. However, rAAV-hrGFP had no effect on the expression of HIF-1α as well as the proliferation and apoptosis of MiaPaCa2 cells under hypoxic conditions. CONCLUSION Under hypoxic conditions, HIF-1α plays a key role in the proliferation of MiaPaCa2 cells, and inhibition of HIF- 1α expression can lead to MiaPaCa2 cell apoptosis.
文摘目的:构建表达端粒重复序列结合因子2(TRF2)基因小干扰RNA(siRNA-TRF2)的腺病毒表达载体(rAd-shRNA-TRF2),并检测该载体对人乳腺癌(MCF-7)细胞TRF2基因表达的沉默效应。方法:采用同源重组法构建重组腺病毒rAd-shRNA-TRF2表达载体,鉴定正确后转染MCF-7细胞,用FQ-RT-PCR和Western blot检测转染后48 h TRF2基因的表达,MTT法和克隆形成实验检测细胞生长状况。结果:重组腺病毒rAd-shRNA-TRF2包装成功,转染MCF-7细胞后,TRF2基因的表达明显被抑制,细胞生长显著抑制,细胞克隆形成能力显著下降。结论:腺病毒介导的TRF2 RNAi表达载体rAd-shRNA-TRF2构建成功,可有效抑制人乳腺癌MCF-7细胞TRF2基因的表达,抑制细胞生长。
