1. MIR21 Drives Resistance to Heat Shock Protein 90 Inhibition in Cholangiocarcinoma.
- Author
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Lampis A, Carotenuto P, Vlachogiannis G, Cascione L, Hedayat S, Burke R, Clarke P, Bosma E, Simbolo M, Scarpa A, Yu S, Cole R, Smyth E, Mateos JF, Begum R, Hezelova B, Eltahir Z, Wotherspoon A, Fotiadis N, Bali MA, Nepal C, Khan K, Stubbs M, Hahne JC, Gasparini P, Guzzardo V, Croce CM, Eccles S, Fassan M, Cunningham D, Andersen JB, Workman P, Valeri N, and Braconi C
- Subjects
- Animals, Bile Duct Neoplasms genetics, Bile Duct Neoplasms metabolism, Bile Duct Neoplasms pathology, Cell Line, Tumor, Cell Survival drug effects, Cholangiocarcinoma genetics, Cholangiocarcinoma metabolism, Cholangiocarcinoma pathology, DNA-Binding Proteins, Dose-Response Relationship, Drug, Gene Expression Regulation, Neoplastic, HSP40 Heat-Shock Proteins genetics, HSP40 Heat-Shock Proteins metabolism, HSP90 Heat-Shock Proteins genetics, HSP90 Heat-Shock Proteins metabolism, Humans, Isocitrate Dehydrogenase genetics, Mice, Inbred NOD, Mice, SCID, MicroRNAs genetics, Mutation, Nuclear Proteins genetics, Organoids, Signal Transduction drug effects, Time Factors, Transcription Factors genetics, Transfection, Tumor Cells, Cultured, Xenograft Model Antitumor Assays, Antineoplastic Agents pharmacology, Bile Duct Neoplasms drug therapy, Cholangiocarcinoma drug therapy, Drug Resistance, Neoplasm genetics, HSP90 Heat-Shock Proteins antagonists & inhibitors, MicroRNAs metabolism
- Abstract
Background & Aims: Cholangiocarcinomas (CCA) are resistant to chemotherapy, so new therapeutic agents are needed. We performed a screen to identify small-molecule compounds that are active against CCAs. Levels of microRNA 21 (MIR21 or miRNA21) are increased in CCAs. We investigated whether miRNA21 mediates resistance of CCA cells and organoids to HSP90 inhibitors., Methods: We performed a high-throughput screen of 484 small-molecule compounds to identify those that reduced viability of 6 human CCA cell lines. We tested the effects of HSP90 inhibitors on cells with disruption of the MIR21 gene, cells incubated with MIR21 inhibitors, and stable cell lines with inducible expression of MIR21. We obtained CCA biopsies from patients, cultured them as organoids (patient-derived organoids). We assessed their architecture, mutation and gene expression patterns, response to compounds in culture, and when grown as subcutaneous xenograft tumors in mice., Results: Cells with IDH1 and PBRM1 mutations had the highest level of sensitivity to histone deacetylase inhibitors. HSP90 inhibitors were effective in all cell lines, irrespective of mutations. Sensitivity of cells to HSP90 inhibitors correlated inversely with baseline level of MIR21. Disruption of MIR21 increased cell sensitivity to HSP90 inhibitors. CCA cells that expressed transgenic MIR21 were more resistant to HSP90 inhibitors than cells transfected with control vectors; inactivation of MIR21 in these cells restored sensitivity to these agents. MIR21 was shown to target the DnaJ heat shock protein family (Hsp40) member B5 (DNAJB5). Transgenic expression of DNAJB5 in CCA cells that overexpressed MIR21 re-sensitized them to HSP90 inhibitors. Sensitivity of patient-derived organoids to HSP90 inhibitors, in culture and when grown as xenograft tumors in mice, depended on expression of miRNA21., Conclusions: miRNA21 appears to mediate resistance of CCA cells to HSP90 inhibitors by reducing levels of DNAJB5. HSP90 inhibitors might be developed for the treatment of CCA and miRNA21 might be a marker of sensitivity to these agents., (Copyright © 2018. Published by Elsevier Inc.)
- Published
- 2018
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