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Inhibition of MiR-155 Using Exosomal Delivery of Antagomir Can Up-Regulate PTEN in Triple Negative Breast Cancer
Javad Razaviyan1, Majid Sirati-Sabet1, Ali Tafti2
1Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Background:
The most aggressive form of breast cancer (BC) is Triple-Negative BC (TNBC), with the poorest prognosis, accounting for nearly 15% of all cases. Since there is no effective treatment, novel strategies, especially targeted therapies, are essential to treat TNBC. Exosomes are nano-sized microvesicles derived from cells and transport various intracellular cargoes, including microRNAs (miRNAs). MiRNAs, small non-coding RNA, are an influential factor in the development of cancerous transformations in cells.
Method:
Bioinformatics analysis of genes related to TNBC revealed that PTEN plays a crucial role in the disease. Relative expression of this gene was analyzed with RT-qPCR in 14 TNBC clinical samples. Electroporation was used to load miRNA antagomir into exosomes extracted from the conditioned medium. Then, the expression of miR-155 and PTEN was evaluated in MDA-MB-231 cells treated with antagomir-loaded exosomes.
Results:
Based on the bioinformatics analysis, miR-155 is a potent inhibitor of PTEN. Following treatment with antagomir-loaded exosomes, RT-qPCR showed significantly reduced miR- 155 and increased PTEN levels in MDA-MB-231 cells.
Conclusion:
Based on the results of this study, exosomes can be effectively used as a cargo of oligonucleotides like miRNA mimics and antagomirs in targeted therapies.
Insights
Exosomes effectively deliver antagomirs to inhibit miR-155, increasing PTEN expression in Triple-Negative Breast Cancer (TNBC) cells. This offers a promising targeted therapy strategy for TNBC treatment.
Area of Science:
- Oncology
- Molecular Biology
- Nanomedicine
Background:
- Triple-Negative Breast Cancer (TNBC) is an aggressive form of breast cancer with limited treatment options.
- MicroRNAs (miRNAs) play a significant role in cancer development and progression.
- Exosomes are natural nanocarriers capable of transporting biomolecules like miRNAs between cells.
Purpose of the Study:
- To investigate the role of miR-155 in Triple-Negative Breast Cancer (TNBC).
- To explore the potential of exosome-mediated delivery of miRNA antagomirs for TNBC targeted therapy.
- To assess the effect of inhibiting miR-155 on PTEN expression in TNBC cells.
Main Methods:
- Bioinformatic analysis identified PTEN as a crucial gene in TNBC and miR-155 as its inhibitor.
- Exosomes were isolated and loaded with a miR-155 antagomir using electroporation.
- Quantitative real-time PCR (RT-qPCR) was used to measure miR-155 and PTEN expression in MDA-MB-231 cells treated with antagomir-loaded exosomes.
Main Results:
- Bioinformatics confirmed miR-155 as a potent inhibitor of PTEN.
- Treatment with antagomir-loaded exosomes significantly reduced miR-155 levels in TNBC cells.
- A significant increase in PTEN expression was observed in TNBC cells following treatment.
Conclusions:
- Exosomes serve as effective delivery vehicles for oligonucleotide therapeutics, such as miRNA antagomirs.
- Exosome-mediated delivery of miR-155 antagomirs represents a viable targeted therapy approach for TNBC.
- This strategy holds potential for improving treatment outcomes in Triple-Negative Breast Cancer.
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