Mutual dependency between a lncRNA and NPM1 is crucial for tumor cell proliferation
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA590634 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR10502320_1.fastq.gz | Fastqsanger.gz | |||
| SRR10502320_2.fastq.gz | Fastqsanger.gz | |||
| SRR10502321_1.fastq.gz | Fastqsanger.gz | |||
| SRR10502321_2.fastq.gz | Fastqsanger.gz | |||
| SRR10502322_1.fastq.gz | Fastqsanger.gz |
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Project description:The nucleolar scaffold protein NPM1 acts as a multifunctional regulator of cellular homeostasis, genome integrity, and stress response. NPM1 mutations, known as NPM1c variants that promote its aberrant cytoplasmic localization, are the most frequent genetic alterations in acute myeloid leukemia (AML). A hallmark of AML cells is their dependency on elevated autophagic flux. In order to identify the proteome changes upon NPM1 and NPM1c overexpression, we performed TMT-labeled mass spectrometry analysis of whole cell lysates.
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Project description:NPM1 is the most frequently mutated gene in cytogenetically normal acute myeloid leukemia (AML). In AML cells, NPM1 mutations result in abnormal cytoplasmic localization of the mutant protein (NPM1c). NPM1 mutations are founding genetic lesions, however it is unknown whether NPM1c is required to maintain the leukemic state. Here, we show that loss of NPM1c from the cytoplasm, either through nuclear relocalization or targeted degradation, results in downregulation of homeobox (HOX) genes, and differentiation and cell growth arrest of AML cells. Additionally, we show that HOX downregulation is the earliest transcriptional event following the loss of NPM1c from the cytoplasm, preceding and promoting differentiation. Finally, we show that XPO1 inhibition efficiently relocalizes NPM1c to the nucleus, enables differentiation and prolongs survival of Npm1c+ leukemic mice. We describe an exquisite dependency of NPM1-mutant AML cells on NPM1c, providing the rationale for the use of nuclear export inhibitors in AML with mutated NPM1.
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Project description:Nucleophosmin (NPM1) is a nucleolar protein and one of the most frequently mutated genes in acute myeloid leukemia (AML). In addition to the commonly detected frameshift mutations in exon12 (NPM1c), previous studies have identified NPM1 gene rearrangements leading to the expression of NPM1-fusion proteins in pediatric AML. However, whether the NPM1-fusions are indeed oncogenic and how the NPM1-fusions cause AML have been largely unknown. In this study, we investigated the subcellular localization and leukemogenic potential of two rare NPM1-fusion proteins, NPM1-MLF1 and NPM1-CCDC28A. NPM1-MLF1 is present in both the nucleus and cytoplasm and occasionally induces AML in the mouse transplantation assay (2/12). NPM1-CCDC28A localizes predominantly to the cytoplasm, immortalizes mouse bone marrow cells in vitro and efficiently (5/6) induces AML in vivo. Mechanistically, both NPM1-fusions bind to the HOX gene cluster and, like NPM1c, cause aberrant upregulation of HOX genes in cooperation with XPO1. The XPO1 inhibitor selinexor suppressed HOX activation and colony formation driven by the NPM1-fusions. Thus, our study provides experimental evidence that both NPM1-MLF1 and NPM1-CCDC28A are oncogenes with functions similar to NPM1c. Inhibition of XPO1 may be a promising strategy for the NPM1-rearranged AML.
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