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Isolation of Cancer Stem Cells From Human Prostate Cancer Samples
Published on: March 14, 2014
miR-3648 Promotes Prostate Cancer Cell Proliferation by Inhibiting Adenomatous Polyposis Coli 2
1Department of Urology, Affiliated Weihai Second Municipal Hospital of Qingdao University, Weihai 264200, China.
Abstract:
Prostate cancer is one of the most common malignancy among men, previous reports suggest that microRNA regulates prostate cancer progression. In present study, we found a novel miRNA, miR-3648, was to be overexpressed in prostate cancer tissues. Its overexpression promoted proliferation of the prostate cancer cell line, LNCaP, as determined by MTT, colony formation and soft agar growth assays. Consistently, knockdown of miR-3648 inhibited LNCaP proliferation. The tumor suppressor, adenomatous polyposis coli 2 (APC2), which negatively regulates the Wnt/β-catenin pathway, was the target of miR-3648. The results of the luciferase reporter assay suggested that miR-3648 binds directly to the 3'UTR of APC2. The Wnt/β-catenin pathway promotes G1/S transition. We evaluated whether miR-3648 regulated the expression of key regulatory proteins involved in G1/S transition, and found that miR-3648 promoted cyclin D1 and cyclin E1 expression while inhibiting p21 expression. This suggested that miR-3648 promoted LNCaP proliferation by targeting APC2, which in turn activates the Wnt/β-catenin pathway to produce the observed effects on cyclin D1, cyclin E1 and p21 expression. Moreover, there was a negative correlation between miR-3648 and APC2 expression in prostate cancer tissues.
Insights
A novel microRNA, miR-3648, is overexpressed in prostate cancer, promoting cancer cell proliferation. It targets APC2, activating the Wnt/β-catenin pathway and affecting cell cycle regulators.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Prostate cancer is a prevalent malignancy in men.
- MicroRNAs (miRNAs) are implicated in regulating prostate cancer progression.
- Understanding novel miRNA roles is crucial for therapeutic development.
Purpose of the Study:
- To identify and characterize novel microRNAs involved in prostate cancer.
- To elucidate the mechanism of action of miR-3648 in prostate cancer cell proliferation.
- To investigate the relationship between miR-3648, APC2, and the Wnt/β-catenin pathway.
Main Methods:
- Overexpression and knockdown of miR-3648 in LNCaP prostate cancer cells.
- Cell proliferation assays (MTT, colony formation, soft agar).
- Luciferase reporter assay to confirm direct targeting of APC2.
- Western blotting to assess protein expression of cell cycle regulators (cyclin D1, cyclin E1, p21).
- Analysis of miR-3648 and APC2 expression correlation in patient tissues.
Main Results:
- miR-3648 was found to be overexpressed in prostate cancer tissues.
- Overexpression of miR-3648 significantly promoted LNCaP cell proliferation, while its knockdown inhibited proliferation.
- miR-3648 directly targets adenomatous polyposis coli 2 (APC2), a negative regulator of the Wnt/β-catenin pathway.
- miR-3648 upregulated cyclin D1 and cyclin E1, and downregulated p21, consistent with Wnt/β-catenin pathway activation.
- A negative correlation was observed between miR-3648 and APC2 expression in prostate cancer tissues.
Conclusions:
- miR-3648 acts as an oncogenic miRNA in prostate cancer by promoting cell proliferation.
- The mechanism involves direct targeting of APC2, leading to activation of the Wnt/β-catenin pathway.
- These findings highlight miR-3648 as a potential therapeutic target for prostate cancer.
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