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Construction of HCC-targeting artificial miRNAs using natural miRNA precursors
1Institute of Hygiene, Zhejiang Academy of Medical Sciences, Hangzhou, Zhejiang 310013, P.R. China.
Abstract:
Hepatocellular carcinoma (HCC) is one of the most common malignancies worldwide, particularly in developing countries. Despite the achievements in clinical therapeutics, the HCC mortality rate remains high. A number of artificial microRNA (amiRNA)-based HCC gene therapy studies have demonstrated significant inhibition of invasion and induction of apoptosis of HCC cancer cells, indicating that this type of therapy may be a promising alternative to current therapeutics. Since the structure of the amiRNA precursor in the specific intracellular environment is critical for the processing to mature amiRNA, a precursor structure that may be efficiently processed is desired. In this study, we constructed amiRNAs targeting firefly luciferase with the precursor structures of six HCC-abundant microRNAs: miR-18a, miR-21, miR-192, miR-221, miR-222 and miR-224, and evaluated the processing efficiency of these amiRNAs in the HCC cell lines Hep3B and HepG2 using a luciferase reporter system. The results demonstrated that these amiRNA precursors are capable of being expressed in HCC cells, with the miR-221 precursor-based amiRNA exhibiting the most efficient inhibition on firefly luciferase at the levels of mRNA and protein activity. This finding provides a basis for constructing HCC-targeting amiRNAs with potent processing efficiency using the precursor structure of miR-221.
Insights
Artificial microRNAs (amiRNAs) show promise for hepatocellular carcinoma (HCC) gene therapy. The miR-221 precursor structure demonstrated the most efficient processing and inhibition of HCC cells in this study.
Area of Science:
- Oncology
- Molecular Biology
- Gene Therapy
Background:
- Hepatocellular carcinoma (HCC) is a prevalent malignancy with high mortality rates.
- Current therapies have limitations, driving research into novel treatments like gene therapy.
- Artificial microRNAs (amiRNAs) show potential for HCC treatment by inhibiting cancer cell invasion and inducing apoptosis.
Purpose of the Study:
- To evaluate the processing efficiency of amiRNAs derived from HCC-abundant microRNA precursors.
- To identify an optimal precursor structure for efficient amiRNA processing in HCC cells.
- To provide a foundation for developing effective HCC-targeting amiRNAs.
Main Methods:
- Constructed amiRNAs targeting firefly luciferase using precursor structures from six HCC-abundant microRNAs (miR-18a, miR-21, miR-192, miR-221, miR-222, miR-224).
- Assessed amiRNA processing efficiency in Hep3B and HepG2 HCC cell lines using a luciferase reporter system.
- Quantified inhibition of firefly luciferase at mRNA and protein activity levels.
Main Results:
- All tested amiRNA precursors were successfully expressed in HCC cells.
- The amiRNA derived from the miR-221 precursor exhibited the highest processing efficiency.
- The miR-221 precursor-based amiRNA demonstrated the most potent inhibition of firefly luciferase activity.
Conclusions:
- The precursor structure of miR-221 is highly efficient for processing amiRNAs in HCC cells.
- This finding supports the use of the miR-221 precursor for constructing potent HCC-targeting amiRNAs.
- Optimizing amiRNA precursor structures is crucial for effective gene therapy in HCC.
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