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MiRNA-363-3p/DUSP10/JNK axis mediates chemoresistance by enhancing DNA damage repair in diffuse large B-cell lymphoma.

ABSTRACT: Anthracycline-based chemotherapy resistance represents a major challenge in diffuse large B-cell lymphoma (DLBCL). MiRNA and gene expression profiles (n = 47) were determined to uncover potential chemoresistance mechanisms and therapeutic approaches. An independent correlation between high expression of miRNA-363-3p and chemoresistance was observed and validated in a larger cohort (n = 106). MiRNA-363-3p was shown to reduce doxorubicin-induced apoptosis and tumor shrinkage in in vitro and in vivo experiments by ectopic expression and CRISPR/Cas9-mediated knockout in DLBCL cell lines. DNA methylation was found to participate in transcriptional regulation of miRNA-363-3p. Further investigation revealed that dual specificity phosphatase 10 (DUSP10) is a target of miRNA-363-3p and its suppression promotes the phosphorylation of c-Jun N-terminal kinase (JNK). The miRNA-363-3p/DUSP10/JNK axis was predominantly associated with negative regulation of homologous recombination (HR) and DNA repair pathways. Ectopic expression of miRNA-363-3p more effectively repaired doxorubicin-induced double-strand break (DSB) while enhancing non-homologous end joining repair and reducing HR repair. Targeting JNK and poly (ADP-ribose) polymerase 1 significantly inhibited doxorubicin-induced DSB repair, increased doxorubicin-induced cell apoptosis and tumor shrinkage, and improved the survival of tumor-bearing mice. In conclusion, the miRNA-363-3p/DUSP10/JNK axis is a novel chemoresistance mechanism in DLBCL that may be reversed by targeted therapy.

SUBMITTER: Zhou W

PROVIDER: S-EPMC9252898 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:There is increasing evidence that cancer recurrence and resistance to chemotherapy are linked to a subset of cancer stem cells. However, detecting these cells specifically and targeting them therapeutically remain challenging. As microRNAs (miRNAs) are emerging as key players in cancer biology, we set up to identify miRNAs involved in chemoresistance of breast cancer stem cells. In this study, we enriched populations of chemoresistant cancer stem cells from breast cancer and non-transformed breast cell lines using mammospheres. These mammospheres were treated or not with two chemoreagents, and we profiled surviving cells using miRNA microarray analysis. Comparison of the profiles from treated and untreated mammospheres as well as control and cancer cells yielded a six-miRNAs signature specific for chemoresistant stem cell-enriched subpopulations. From this signature miR-363-3p was found to be most highly overexpressed in various breast cancer cell lines and derived cancer stem cell-enriched populations, whereas non-tumorigenic cells had low levels. Inhibition of miR-363-3p was found to decrease cancer stem cell maintenance and tumorigenicity in vitro. Consistently, miR-363-3p downregulation decreased tumor growth and metastatization by human tumor cells transplanted in mice. Finally, miR363-3p levels in the sera of 38 breast cancer patients enrolled in a neoadjuvant trial correlated well with the response to the chemotherapeutic treatments. Altogether, miR363-3p was identified as a mediator of the breast cancer stem cell phenotype, and it may provide a predictor of the response to chemotherapy from a simple blood test, as well as a potential therapeutic approach for cancer stem cell targeting. This data set aims at identifying differentially expressed miRNAs in chemoresistant mammospheres, by the profiling of miRNA in MCF7 breast cancer cell-derived mammospheres selected to be resistant to 5 Fluorouracil (5FU) or Paclitaxel, as compared to unselected MCF7 mammospheres.

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MiRNA-363-3p/DUSP10/JNK axis mediates chemoresistance by enhancing DNA damage repair in diffuse large B-cell lymphoma.

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