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Updated: May 15, 2026
DNA Vector-based RNA Interference to Study Gene Function in Cancer
Published on: June 4, 2012
[Construction of let-7d expression vector and its inhibitory effect on HMGA2 and ras expression in human ovarian
Haiyan Ye1, Jianguo Chen, Xiaosui Huang
1Department of Gynecology, Medical Research Center, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou 510080, China. yehaiyan5413@139.com
Objective:
To elucidate the role of let-7d in regulating the biological behavior of ovarian cancer cells and their expressions of HMGA2 and ras proteins.
Methods:
The pre-let-7d sequence was synthesized and inserted into pcDNA6.2GW/EmGFPmiR and transfected into ovarian cancer IGROV1 cells to cause pre-let-7d overexpression. Real-time quantitative RT-PCR was employed to examine the expression levels of let-7d miRNA and HMGA2 mRNA, and Western blotting was performed to detect the expressions of HMGA2 and ras protein in the transfected cells. The effect of pcDNA6.2GW-let-7d transfection on IGROV1 cell proliferation was determined using MTT assay and the cell apoptosis rate was measured using flow cytometry.
Results:
The eukaryotic expression vector containing the target gene let-7d was successfully constructed and transfected into IGROV1 cells. The transfected cells showed a marked reduction of HMGA2 expression but a less obvious down-regulation of ras expression. Transfection with pcDNA6.2GW-let-7d to suppress the expression of HMGA2 caused alterations of the phenotype of IGROV1 cells shown by a reduced proliferative activity and increased cell apoptosis.
Conclusion:
Let-7d plays an important role in altering the malignant cell phenotype of ovarian cancer IGROV1 cells by regulating the expression of HMGA2.
Insights
Let-7d microRNA significantly reduces ovarian cancer cell proliferation and increases apoptosis by downregulating HMGA2 expression. This study highlights let-7d as a key regulator of ovarian cancer cell behavior.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Context:
- Ovarian cancer is a leading cause of cancer-related deaths in women.
- Aberrant expression of microRNAs (miRNAs) and high mobility group AT-hook 2 (HMGA2) are implicated in ovarian cancer progression.
- Understanding the regulatory mechanisms of ovarian cancer cell behavior is crucial for developing effective therapies.
Purpose:
- To investigate the role of let-7d in regulating the biological behavior of ovarian cancer cells.
- To determine the effect of let-7d on the expression of HMGA2 and ras proteins in ovarian cancer cells.
- To assess the impact of let-7d overexpression on ovarian cancer cell proliferation and apoptosis.
Summary:
- Let-7d was overexpressed in IGROV1 ovarian cancer cells using a synthesized pre-let-7d sequence in a pcDNA6.2GW/EmGFPmiR vector.
- Quantitative RT-PCR and Western blotting confirmed that let-7d overexpression significantly reduced HMGA2 mRNA and protein levels, with a less pronounced effect on ras protein.
- MTT assays and flow cytometry demonstrated that let-7d-induced suppression of HMGA2 led to decreased IGROV1 cell proliferation and increased apoptosis.
Impact:
- Let-7d acts as a tumor suppressor in ovarian cancer by regulating HMGA2 expression.
- Overexpression of let-7d can alter the malignant phenotype of ovarian cancer cells, suggesting therapeutic potential.
- This research provides insights into the molecular mechanisms underlying ovarian cancer development and offers a potential target for miRNA-based therapies.
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