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BMC Cancer
Published in: BMC Cancer 1/2022

Open Access 01-12-2022 | Colorectal Cancer | Research

Mir-675-5p supports hypoxia-induced drug resistance in colorectal cancer cells

Authors: Chiara Zichittella, Maria Magdalena Barreca, Aurora Cordaro, Chiara Corrado, Riccardo Alessandro, Alice Conigliaro

Published in: BMC Cancer | Issue 1/2022

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Abstract

Background

The uncontrolled proliferation of cancer cells determines hypoxic conditions within the neoplastic mass with consequent activation of specific molecular pathways that allow cells to survive despite oxygen deprivation. The same molecular pathways are often the cause of chemoresistance. This study aims to investigate the role of the hypoxia-induced miR-675-5p in 5-Fluorouracil (5-FU) resistance on colorectal cancer (CRC) cells.

Methods

CRC cell lines were treated with 5-Fu and incubated in normoxic or hypoxic conditions; cell viability has been evaluated by MTT assay. MiR-675-5p levels were analysed by RT-PCR and loss and gain expression of the miRNA has been obtained by the transfection of miRNA antagomir or miRNA mimic. Total protein expression of different apoptotic markers was analysed through western blot assay. MirWalk 2.0 database search engine was used to investigate the putative targets of the miR-675-5p involved in the apoptotic process. Finally, the luciferase assay was done to confirm Caspase-3 as a direct target of the miR-675-5p.

Results

Our data demonstrated that hypoxia-induced miR-675-5p counteracts the apoptotic signal induced by 5-FU, thus taking part in the drug resistance response. We showed that the apoptotic markers, cleaved PARP and cleaved caspase-3, increased combining miR-675-5p inhibition with 5-FU treatment. Moreover, we identified pro-caspase-3 among the targets of the miR-675-5p.

Conclusion

Our data demonstrate that the inhibition of hypoxia-induced miR-675-5p combined with 5-FU treatment can enhances drug efficacy in both prolonged hypoxia and normoxia, indicating a possible strategy to partially overcome chemoresistance.
Appendix
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Metadata
Title
Mir-675-5p supports hypoxia-induced drug resistance in colorectal cancer cells
Authors
Chiara Zichittella
Maria Magdalena Barreca
Aurora Cordaro
Chiara Corrado
Riccardo Alessandro
Alice Conigliaro
Publication date
01-12-2022
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2022
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-022-09666-2

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