Abstract
Background
RNA (ribonucleic acid) antisense is developing as a possible treatment option. As an RNA, miR-34a is involved in P53 function and cancer cell apoptosis. Although the therapeutic applications of miRNAs have several limitations, such as structural instability and susceptibility to nucleases. To resolve these issues, this study aims to apply exosomes as a delivery vehicle for miR-34a.
Aims
This study aims to create a cell factory to generate miR34a-enriched exosomes. The produced nanoparticles act as a delivery system and improve the structural stability of miR34a.
Methods
First exosome specific sequences were inserted into miR34a. The resulting miR34a oligonucleotide was transduced HEK293T cells genome with a lentiviral system. In the structure of miR34a oligonucleotide, six nucleotides were substituted to increase its packaging rate into exosomes. To maintain the secondary structure, stability, and expression of the miRNA gene, changes to the miR34a oligonucleotide were made using PCR (polymerase chain reaction) Extension. The forward-34a (5-TGGGGAGAGGCAGGACAGG-3) and Reverse-34a primers (5-TCCGAAGTCCTGGCGTCTCC-3) were used for amplification of the miR34a gene from DNA.
Results
The results confirmed that the changes in miR34a oligonucleotide do not affect its secondary structure. The energy level of the manipulated miR34a oligonucleotide was kept the same compared to the original one. Moreover, the loading of miR34a to the exosomes was increased.
Conclusion
Our findings revealed that normal HEK293T did not express miR34a. However, lentiviral transduced miR34a oligonucleotide induced the loading of miR34a into the exosome. Moreover, replacing six nucleic acids in the 3’ end of miR34a increased the loading of miR34a to exosome.
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Data Availability
All the data are reported as they were obtained. And the original data will be presented upon a reasonable request. The RNA folding (Fig. 1) was obtained from http://rna.tbi.univie.ac.at/cgi-bin/RNAWebSuite/RNAfold.cgi website.
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Acknowledgements
This study was supported financially by Grant No. #2837 from Mazandaran University of Medical Sciences, Sari, Iran.
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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All animal experiments were approved by the Research and Ethical Committee of Mazandaran University of Medical Sciences, Sari, Iran.
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Sarkami, S.A., Molavipordanjani, S., Abediankenari, S. et al. Engineering HEK293T cell line by lentivirus to produce miR34a-loaded exosomes. Mol Biol Rep 50, 8827–8837 (2023). https://doi.org/10.1007/s11033-023-08754-1
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DOI: https://doi.org/10.1007/s11033-023-08754-1