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Engineered exosomes for targeted co-delivery of miR-21 inhibitor and chemotherapeutics to reverse drug resistance in colon cancer
Abstract
Background: 5-Fluorouracil (5-FU) has been commonly prescribed for patients with colorectal cancer (CRC), but resistance to 5-FU is one of the main reasons for failure in CRC. Recently, microRNAs (miRNAs) have been established as a means of reversing the dilemma by regulating signaling pathways involved in initiation and progression of CRC. However, how to safely and effectively deliver miRNA to target cells becomes a main challenge. Results: In this study, Engineered exosomes were exploited to simultaneously deliver an anticancer drug 5-FU and miR-21 inhibitor oligonucleotide (miR-21i) to Her2 expressing cancer cells. Purified engineered exosomes from the donor cells loaded with 5-FU and miR-21i via electroporation to introduce into 5-FU-resistant colorectal cancer cell line HCT-116 5FR . Furthermore, systematic administration of 5-FU and miR-21i loaded exosomes in tumor bearing mice indicated a significantly anti-tumor effect. The results showed that the engineered exosome-based 5-FU and miR-21i co-delivery system could efficiently facilitate cellular uptake and significantly down-regulate miR-21 expression in 5-FU resistant HCT-116 5FR cell lines. Consequently, the down-regulation of miR-21 induced cell cycle arrest, reduced tumor proliferation, increased apoptosis and rescued PTEN and hMSH2 expressions, regulatory targets of miR-21. Of particular importance was the significant reduction in tumor growth in a mouse model of colon cancer with systematic administration of the targeting miR-21i. More excitedly, the combinational delivery of miR-21i and 5-FU with the engineered exosomes effectively reverse drug resistance and significantly enhanced the cytotoxicity in 5-FU-resistant colon cancer cells, compared with the single treatment with either miR-21i or 5-FU. Conclusion: The strategy for co-delivering the functional small RNA and anticancer drug by exosomes foreshadows a potential approach to reverse the drug resistance in CRC and thus to enhance the efficacy of the cancer treatment.
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“| Colorectal cancer | Target-Her2-LAMP2-GFP, THLG-Exo/5-FU/miR-21i | Effectively reversed drug resistance in colorectal cancer cells | [148] |”
From Emerging role of exosomes in cancer therapy: progress and challenges (2025) · cites this paper as [148]
In the citing paper
“The engineered exosomes caused cell cycle halt, enhanced apoptosis, and inhibited cancer cells proliferation more effectively compared to the single-agent therapy with either miR-21i or 5-FU alone.”
From Emerging role of exosomes in cancer therapy: progress and challenges (2025) · cites this paper as [148]
In the citing paper
“These findings suggest that this exosome-based delivery system holds substantial potential for enhancing the efficacy of conventional chemotherapy, particularly in drug-resistant cancers [148].”
From Emerging role of exosomes in cancer therapy: progress and challenges (2025) · cites this paper as [148]
In the citing paper
“Herein, Gaofeng Liang et al. created a method to generate targeted exosomes for co- transport of a miR-21 inhibitor (miR-21i) and anticancer agents into 5-FU-resistant HCT-116 (HCT-1165FR) cells, a colorectal cancer cell line with high miR-21 expression.”
From Emerging role of exosomes in cancer therapy: progress and challenges (2025) · cites this paper as [148]
In the citing paper
“To efficiently direct the exosomes to HCT-1165FR cells, they fused Her2 with LAMP2, which allowed the Her2-LAMP2 fusion protein to be displayed on the exosome surface, thereby facilitating targeted uptake via EGFR receptor- driven endocytosis in HCT-116 cells.”
From Emerging role of exosomes in cancer therapy: progress and challenges (2025) · cites this paper as [148]
In the citing paper
“Overall, the co-delivery of miR-21i and 5-FU using the engineered THLG-Exo resulted in a synergistic effect that effectively reversed drug resistance in colorectal cancer cells.”
From Emerging role of exosomes in cancer therapy: progress and challenges (2025) · cites this paper as [148]
In the citing paper
“The combination therapy significantly enhanced cytotoxicity in the drug-resistant cells compared to either agent used alone.”
From Emerging role of exosomes in cancer therapy: progress and challenges (2025) · cites this paper as [148]
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Metadata
- Authors
- Liang, G., Zhu, Y., Ali, D. J., Tian, T., Xu, H., Si, K., Sun, B., Chen, B., & Xiao, Z.
- Venue
- Journal of Nanobiotechnology
- Published
- 2020-01-09
- Volume
- 18
- Issue
- 1
- ISSN
- 1477-3155
- PMC
- PMC6950820
- Cited by
- 619
- References
- 6
- Language
- en
- Funders
- Chinese National Postdoctoral Science Foundation (2017M611661)
- National Natural Science Foundation of China (81671807, 81741147)
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