2017
DOI: 10.1038/srep45332
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Activation of ERK1/2 Causes Pazopanib Resistance via Downregulation of DUSP6 in Synovial Sarcoma Cells

Abstract: Synovial sarcoma (SS) is a rare high-grade malignant mesenchymal tumour with a relatively poor prognosis despite intensive multimodal therapy. Although pazopanib, a multi-kinase inhibitor, is often used for advanced SS, most cases eventually become resistant to pazopanib. In the present study, we investigated the mechanisms of acquired pazopanib resistance in SS. To examine acquired pazopanib resistance, two SS cell lines, SYO-1 and HS-SY-II, were isolated after multiple selection steps with increasing concent… Show more

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Cited by 9 publications
(8 citation statements)
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“…To address the role of ERKs activation in pazopanib resistant MoJo cells, we analyzed expression of the ERK-specific phosphatase MKP3 (DUSP6). Indeed, enhanced ERK activation has been recently associated with in vitro acquired SS resistance to pazopanib as a consequence of MKP3 downregulation [21]. Conversely, we found MKP3 markedly overexpressed in MoJo compared to SYO-1 cells and not detectable in CME-1 cells (Figure 4A).…”
Section: Resultsmentioning
confidence: 48%
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“…To address the role of ERKs activation in pazopanib resistant MoJo cells, we analyzed expression of the ERK-specific phosphatase MKP3 (DUSP6). Indeed, enhanced ERK activation has been recently associated with in vitro acquired SS resistance to pazopanib as a consequence of MKP3 downregulation [21]. Conversely, we found MKP3 markedly overexpressed in MoJo compared to SYO-1 cells and not detectable in CME-1 cells (Figure 4A).…”
Section: Resultsmentioning
confidence: 48%
“…Moreover, the high levels of the ERK-specific MKP3 phosphatase, which is transcriptionally induced by ERK, reflected an enhanced negative feedback required to avoid growth arrest or cell death caused by excessive ERK activation [47]. It is noteworthy that, in apparent contrast with our data, reduced MKP3 levels, also enhancing ERK activation, have been associated with in vitro acquired pazopanib resistance [21]. Convergence on ERK pathway activation of different mechanisms of intrinsic and acquired resistance underlines the relevance of this signaling axis in the modulation of SS cell sensitivity to the drug.…”
Section: Discussionmentioning
confidence: 55%
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“…Erk1/2 is an important component of the cascade of Ras-Raf-MEK-ERK signaling pathway, which has received extensive attention in tumor resistance and tumor therapy [27][28][29]. It is activated in many cisplatin treated cell lines [30][31][32][33]. In the resting state, ERK1/2 binds to MEK in the cytoplasm.…”
Section: Discussionmentioning
confidence: 99%
“…Another possible strategy for cancer treatment is to reverse or replace DUSP6 function. For example, Yokoyama et al 118 demonstrated that increased ERK1/2 expression and downregulated DUSP6 caused pazopanib resistance in synovial sarcoma cells. Hence, simultaneous treatment with pazopanib and a MEK inhibitor would be a good strategy to overcome resistance.…”
Section: Frontiersmentioning
confidence: 99%