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A multitargeting approach rewires cell identity in fusion-negative rhabdomyosarcoma [bulk_ATACseq]

ABSTRACT: Rhabdomyosarcoma (RMS), the most common soft-tissue sarcoma occurring in the pediatric population, arises from the skeletal muscle compartment. Several transcriptional and post-transcriptional regulators lock the tumor in a continuous undifferentiated state and prevent the cells from returning to quiescence. MicroRNAs (miRNAs) are short non-coding RNAs that modulate cell identity by means of post-transcriptional regulation of messenger RNAs. In this study, we aimed at identifying miRNAs that could affect FN-RMS cell identity. Thus, we analyzed publicly available datasets and identified miR-449a and miR-340 as the main regulators of cell cycle and p53 signaling. Using miR-eCLIP technology, we identified the direct effects of miRNAs in FN-RMS cell lines, and an overall rewiring of cell identity at the transcriptomic, epigenetic and metabolic level. We observed that miR-449a+340 directly and indirectly targeted glycolysis and pyruvate entry into mitochondria by inhibiting mitochondrial pyruvate complex (MPC) inhibition. The pharmacological inhibition of MPC resulted in a similar metabolic shift with cell cycle exit and a significant reduction in metastatic potential of FN-RMS models. In conclusion, the combination of miR-449 and miR-340 play a pivotal role in orchestrating the cell identity of FN-RMS, and the modulation of MPC emerges as a key factor in redirecting FN-RMS towards a quiescent, non-tumorigenic state.

ORGANISM(S): Mus musculus Homo sapiens

PROVIDER: GSE275736 | GEO | 2024/09/03

REPOSITORIES: GEO

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Project description:We tested the hypothesis that a panel of placental mammal-specific miRNAs and their targets play important to establish receptivity to implantation and their dysregulated expression may be a feature in women with early pregnancy loss. Relative expression levels of miR-340-5p, −542-3p, and −671-5p all increased following treatment of Ishikawa cells with progesterone (10 μg/ml) for 24 hrs (p < 0.05). RNA sequencing of these P4-treated cells identified co-ordinate changes to 6,367 transcripts of which 1713 were predicted targets of miR-340-5p, 670 of miR-542-3p, and 618 of miR-671-5p. Quantitative proteomic analysis of Ishikawa cells transfected with mimic or inhibitor (48 hrs: n=3 biological replicates) for each of the P4-regulated miRNAs was carried out to identify targets of these miRNAs. Excluding off target effects, mir-340-5p mimic altered 1,369 proteins while inhibition changed expression of 376 proteins (p < 0.05) of which, 72 were common to both treatments. A total of 280 proteins were identified between predicted (mirDB) and confirmed (in vitro) targets. In total, 171 proteins predicted to be targets by mirDB were altered in vitro by treatment with miR-340-5p mimic or inhibitor and were also altered by treatment of endometrial epithelial cells with P4. In vitro targets of miR-542-3p identified 1,378 proteins altered by mimic while inhibition altered 975 a core of 200 proteins were changed by both. 100 protein targets were predicted and only 46 proteins were P4 regulated. miR-671-mimic altered 1,252 proteins with inhibition changing 492 proteins of which 97 were common to both, 95 were miDB predicted targets and 46 were also P4-regulated. All miRNAs were detected in endometrial biopsies taken from patients during the luteal phase of their cycle, irrespective of prior or future pregnancy outcomes Expression of mir-340-5p showed an overall increase in patients who had previously suffered a miscarriage and had a subsequent miscarriage, as compared to those who had infertility or previous miscarriage and subsequently went on to have a life birth outcome. The regulation of these miRNAs and their protein targets regulate the function of transport and secretion, and adhesion of the endometrial epithelia required for successful implantation in humans. Dysfunction of these miRNAs (and therefore the targets they regulate) may contribute to endometrial-derived recurrent pregnancy loss in women.

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A multitargeting approach rewires cell identity in fusion-negative rhabdomyosarcoma [bulk_ATACseq]

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