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Published on: April 14, 2010
[Screening of optimal siRNA interference sequence of CIT gene and its inhibition expression in hepatoma SK-Hep-1]
1Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education and Department of Infectious Diseases, Chongqing Medical University, Chongqing 400016, China.
Abstract:
Objective: To construct and screen optimal siRNA interference sequence of CIT gene and to detect its interference efficiency as well as proliferation effect in human hepatoma cell line SK-Hep-1. Methods: Three siRNA target spots were designed and synthesized according to the CIT gene sequence. SK-Hep-1 HCC cells were transfected by liposome transfection. The knockdown efficiency of the target CIT gene was detected by real-time PCR and Western blot. Expressional change of CIT in SK-Hep-1 cells after 48 hours of siRNA interference were observed by immunohistochemistry and confocal microscopy. The proliferation of SK-Hep-1 cells after 48 hours of siRNA interference was detected by EdU cell proliferation assay. A t-test was used to compare the mean of two samples, and one-way ANOVA was used to compare the mean of multiple samples. Results: Western blot results showed that the three interference sequences were targeted at different target spots. The expression level of CIT protein in KD-1,-2, and-3 groups were decreased (P < 0.01) than control, while the protein expression level of KD1 group was the lowest. Real-time PCR results showed that compared with the control group, the expression level of CIT mRNA in KD-1, -2, and -3 groups decreased (P < 0.01), while that in KD1 group was the lowest. Laser confocal microscopy also confirmed that the morphological expression of CIT attenuated significantly after transfection with siRNA. The results of EdU proliferation assay showed that siRNA transfected with CIT significantly attenuated the proliferation of SK-Hep-1 hepatoma cells (P < 0.05). Conclusion: The successful construction and screening of siRNA fragments can effectively inhibit the expression and proliferation of CIT gene in hepatoma SK-Hep-1.
Insights
Researchers developed optimal siRNA interference sequences for the CIT gene. These sequences effectively inhibited both CIT gene expression and proliferation in human hepatoma SK-Hep-1 cells.
Area of Science:
- Molecular Biology
- Hepatocellular Carcinoma Research
- Gene Silencing Therapeutics
Background:
- Hepatocellular carcinoma (HCC) is a significant global health concern.
- The CIT gene's role in HCC progression requires further investigation.
- Targeting specific genes offers a potential therapeutic strategy for HCC.
Purpose of the Study:
- To design and validate optimal small interfering RNA (siRNA) sequences targeting the CIT gene.
- To assess the efficacy of siRNA in reducing CIT gene expression in human hepatoma cells.
- To evaluate the impact of CIT gene inhibition on hepatoma cell proliferation.
Main Methods:
- Synthesis of three distinct siRNA sequences targeting the CIT gene.
- Liposome-mediated transfection of SK-Hep-1 HCC cells.
- Quantification of CIT gene and protein expression using real-time PCR and Western blot.
- Assessment of cell proliferation via EdU assay and morphological changes via confocal microscopy.
Main Results:
- All three siRNA sequences significantly reduced CIT mRNA and protein levels in SK-Hep-1 cells (P < 0.01).
- The KD1 siRNA sequence demonstrated the most potent inhibition of CIT expression.
- siRNA-mediated CIT gene silencing significantly attenuated hepatoma cell proliferation (P < 0.05).
Conclusions:
- Successfully constructed and screened effective siRNA sequences for CIT gene knockdown.
- Demonstrated that inhibiting CIT gene expression reduces proliferation in SK-Hep-1 hepatoma cells.
- Highlights the potential of targeting the CIT gene as a therapeutic approach for HCC.
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