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Generating in vitro models of NTRK-fusion mesenchymal neoplasia as tools for investigating kinase oncogenic activation and response to targeted therapy
Generating in vitro models of NTRK-fusion mesenchymal neoplasia as tools for investigating kinase oncogenic activation and response to targeted therapy
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Generating in vitro models of NTRK-fusion mesenchymal neoplasia as tools for investigating kinase oncogenic activation and response to targeted therapy
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Generating in vitro models of NTRK-fusion mesenchymal neoplasia as tools for investigating kinase oncogenic activation and response to targeted therapy
Generating in vitro models of NTRK-fusion mesenchymal neoplasia as tools for investigating kinase oncogenic activation and response to targeted therapy

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Generating in vitro models of NTRK-fusion mesenchymal neoplasia as tools for investigating kinase oncogenic activation and response to targeted therapy
Generating in vitro models of NTRK-fusion mesenchymal neoplasia as tools for investigating kinase oncogenic activation and response to targeted therapy
Journal Article

Generating in vitro models of NTRK-fusion mesenchymal neoplasia as tools for investigating kinase oncogenic activation and response to targeted therapy

2023
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Overview
The discovery of neurotrophic tyrosine receptor kinase (NTRK) gene fusions as pan-tumor oncogenic drivers has led to new personalized therapies in oncology. Recent studies investigating NTRK fusions among mesenchymal neoplasms have identified several emerging soft tissue tumor entities displaying various phenotypes and clinical behaviors. Among them, tumors resembling lipofibromatosis or malignant peripheral nerve sheath tumors often harbor intra-chromosomal NTRK1 rearrangements, while most infantile fibrosarcomas are characterized by canonical ETV6::NTRK3 fusions. However, appropriate cellular models to investigate mechanisms of how kinase oncogenic activation through gene fusions drives such a wide spectrum of morphology and malignancy are lacking. Progress in genome editing has facilitated the efficient generation of chromosomal translocations in isogenic cell lines. In this study we employ various strategies to model NTRK fusions, including LMNA::NTRK1 (interstitial deletion) and ETV6::NTRK3 (reciprocal translocation) in human embryonic stem (hES) cells and mesenchymal progenitors (hES-MP). Here, we undertake various methods to model non-reciprocal, intrachromosomal deletions/translocations by induction of DNA double strand breaks (DSBs) exploiting either the repair mechanisms of homology directed repair (HDR) or non-homologous end joining (NHEJ). Expression of LMNA::NTRK1 or ETV6::NTRK3 fusions in either hES cells or hES-MP did not affect cell proliferation. However, the level of mRNA expression of the fusion transcripts was significantly upregulated in hES-MP, and phosphorylation of the LMNA::NTRK1 fusion oncoprotein was noted only in hES-MP but not in hES cells. Similarly, an NTRK1-driven transcriptional profile related to neuronal and neuroectodermal lineage was upregulated mainly in hES-MP, supporting the importance of appropriate cellular context in modeling cancer relevant aberrations. As proof of concept of the validity of our in vitro models, phosphorylation was depleted by two TRK inhibitors, Entrectinib and Larotrectinib, currently used as targeted therapy for tumors with NTRK fusions.