Subcellular Distribution of p53 by the p53-Responsive lncRNA NBAT1 Determines Chemotherapeutic Response in Neuroblastoma

Neuroblastoma has a low mutation rate for the gene. Alternative ways of p53 inactivation have been proposed in neuroblastoma, such as abnormal cytoplasmic accumulation of wild-type p53. However, mechanisms leading to p53 inactivation via cytoplasmic accumulation are not well investigated. Here we sh...

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Veröffentlicht in:Cancer research (Chicago, Ill.) Ill.), 2021-03, Vol.81 (6), p.1457-1471
Hauptverfasser: Mitra, Sanhita, Muralidharan, Somsundar Veppil, Di Marco, Mirco, Juvvuna, Prasanna Kumar, Kosalai, Subazini Thankaswamy, Reischl, Silke, Jachimowicz, Daniel, Subhash, Santhilal, Raimondi, Ivan, Kurian, Leo, Huarte, Maite, Kogner, Per, Fischer, Matthias, Johnsen, John Inge, Mondal, Tanmoy, Kanduri, Chandrasekhar
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container_issue 6
container_start_page 1457
container_title Cancer research (Chicago, Ill.)
container_volume 81
creator Mitra, Sanhita
Muralidharan, Somsundar Veppil
Di Marco, Mirco
Juvvuna, Prasanna Kumar
Kosalai, Subazini Thankaswamy
Reischl, Silke
Jachimowicz, Daniel
Subhash, Santhilal
Raimondi, Ivan
Kurian, Leo
Huarte, Maite
Kogner, Per
Fischer, Matthias
Johnsen, John Inge
Mondal, Tanmoy
Kanduri, Chandrasekhar
description Neuroblastoma has a low mutation rate for the gene. Alternative ways of p53 inactivation have been proposed in neuroblastoma, such as abnormal cytoplasmic accumulation of wild-type p53. However, mechanisms leading to p53 inactivation via cytoplasmic accumulation are not well investigated. Here we show that the neuroblastoma risk-associated locus 6p22.3-derived tumor suppressor is a p53-responsive lncRNA that regulates p53 subcellular levels. Low expression of provided resistance to genotoxic drugs by promoting p53 accumulation in cytoplasm and loss from mitochondrial and nuclear compartments. Depletion of altered CRM1 function and contributed to the loss of p53-dependent nuclear gene expression during genotoxic drug treatment. CRM1 inhibition rescued p53-dependent nuclear functions and sensitized -depleted cells to genotoxic drugs. Combined inhibition of CRM1 and MDM2 was even more effective in sensitizing aggressive neuroblastoma cells with p53 cytoplasmic accumulation. Thus, our mechanistic studies uncover an -dependent CRM1/MDM2-based potential combination therapy for patients with high-risk neuroblastoma. SIGNIFICANCE: This study shows how a p53-responsive lncRNA mediates chemotherapeutic response by modulating nuclear p53 pathways and identifies a potential treatment strategy for patients with high-risk neuroblastoma.
doi_str_mv 10.1158/0008-5472.CAN-19-3499
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Alternative ways of p53 inactivation have been proposed in neuroblastoma, such as abnormal cytoplasmic accumulation of wild-type p53. However, mechanisms leading to p53 inactivation via cytoplasmic accumulation are not well investigated. Here we show that the neuroblastoma risk-associated locus 6p22.3-derived tumor suppressor is a p53-responsive lncRNA that regulates p53 subcellular levels. Low expression of provided resistance to genotoxic drugs by promoting p53 accumulation in cytoplasm and loss from mitochondrial and nuclear compartments. Depletion of altered CRM1 function and contributed to the loss of p53-dependent nuclear gene expression during genotoxic drug treatment. CRM1 inhibition rescued p53-dependent nuclear functions and sensitized -depleted cells to genotoxic drugs. Combined inhibition of CRM1 and MDM2 was even more effective in sensitizing aggressive neuroblastoma cells with p53 cytoplasmic accumulation. 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subjects Animals
Antineoplastic Combined Chemotherapy Protocols - pharmacology
Antineoplastic Combined Chemotherapy Protocols - therapeutic use
Apoptosis
Cancer and Oncology
Cancer och onkologi
Cell and Molecular Biology
Cell Fractionation
Cell Line, Tumor
Cell Nucleus - genetics
Cell Nucleus - metabolism
Cell- och molekylärbiologi
Cytoplasm - genetics
Cytoplasm - metabolism
DNA Damage - drug effects
Drug Resistance, Neoplasm - drug effects
Drug Resistance, Neoplasm - genetics
Exportin 1 Protein
Farmaceutisk vetenskap
Female
Gene Expression Regulation, Neoplastic - drug effects
Gene Knockdown Techniques
Humans
Karyopherins - antagonists & inhibitors
Karyopherins - metabolism
Läkemedelskemi
Male
Medicin och hälsovetenskap
Medicinal Chemistry
Mice
Mitochondria - genetics
Mitochondria - metabolism
Neuroblastoma - drug therapy
Neuroblastoma - genetics
Neuroblastoma - pathology
Neuroblastoma - surgery
Pharmaceutical Sciences
Proto-Oncogene Proteins c-mdm2 - antagonists & inhibitors
Proto-Oncogene Proteins c-mdm2 - metabolism
Receptors, Cytoplasmic and Nuclear - antagonists & inhibitors
Receptors, Cytoplasmic and Nuclear - metabolism
RNA, Long Noncoding - genetics
RNA, Long Noncoding - metabolism
Tumor Suppressor Protein p53 - genetics
Tumor Suppressor Protein p53 - metabolism
Xenograft Model Antitumor Assays
title Subcellular Distribution of p53 by the p53-Responsive lncRNA NBAT1 Determines Chemotherapeutic Response in Neuroblastoma
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