LncRNA HORAS5 Promotes Taxane Resistance in Castration-Resistant Prostate Cancer via a BCL2A1-dependent Mechanism

Pucci, Perla; Venalainen, Erik; Alborelli, Ilaria; Quagliata, Luca; Hawkes, Cheryl; Mather, Rebecca; Romero, Ignacio A; Rigas, Sushila; Wang, Yuzhuo and Crea, Francesco (2020). LncRNA HORAS5 Promotes Taxane Resistance in Castration-Resistant Prostate Cancer via a BCL2A1-dependent Mechanism. Epigenomics (In Press).

DOI: https://doi.org/10.2217/epi-2019-0316

Abstract

Background: Castration-resistant prostate cancer (CRPC) is an incurable malignancy. Long noncoding RNAs (lncRNAs) play key roles in drug resistance. Materials & methods: LncRNA HORAS5 role in cabazitaxel resistance (i.e., cell-count, IC50 and caspase activity) was studied via lentiviral-mediated overexpression and siRNA-based knockdown. Genes expression was analyzed with RNA-sequencing, reverse transcription quantitative PCR (RT-qPCR) and western blot. HORAS5 expression was queried in clinical database. Results: Cabazitaxel increased HORAS5 expression that upregulated BCL2A1, thereby protecting CRPC cells from cabazitaxel-induced apoptosis. BCL2A1 knockdown decreased cell-count and increased apoptosis in CRPC cells. HORAS5-targeting antisense oligonucleotide decreased cabazitaxel IC50. In CRPC clinical samples, HORAS5 expression increased upon taxane treatment. Conclusion:HORAS5 stimulates the expression of BCL2A1 thereby decreasing apoptosis and enhancing cabazitaxel resistance in CRPC cells.

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