Phosphoproteomic analysis identifies TYRO3 as a mediator of sunitinib resistance in metastatic thymomas
Background: After initially responding to empiric radio-chemotherapy, most advanced thymomas (TH) and thymic carcinomas (TC) become refractory and require second-line therapy. The multi-target receptor tyrosine kinase (RTK) inhibitor, sunitinib, is one of the few options, especially in patients with...
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
29 September 2022
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| In: |
Cancers
Year: 2022, Volume: 14, Issue: 19, Pages: 1-14 |
| ISSN: | 2072-6694 |
| DOI: | 10.3390/cancers14194762 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.3390/cancers14194762 Verlag, kostenfrei, Volltext: https://www.mdpi.com/2072-6694/14/19/4762 
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| Author Notes: | Stefan Küffer, Jessica Grabowski, Satoru Okada, Nikolai Sojka, Stefan Welter, Alexander von Hammerstein-Equord, Marc Hinterthaner, Lucia Cordes, Xenia von Hahn, Denise Müller, Christian Sauer, Hanibal Bohnenberger, Alexander Marx and Philipp Ströbel |
MARC
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| 245 | 1 | 0 | |a Phosphoproteomic analysis identifies TYRO3 as a mediator of sunitinib resistance in metastatic thymomas |c Stefan Küffer, Jessica Grabowski, Satoru Okada, Nikolai Sojka, Stefan Welter, Alexander von Hammerstein-Equord, Marc Hinterthaner, Lucia Cordes, Xenia von Hahn, Denise Müller, Christian Sauer, Hanibal Bohnenberger, Alexander Marx and Philipp Ströbel |
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| 520 | |a Background: After initially responding to empiric radio-chemotherapy, most advanced thymomas (TH) and thymic carcinomas (TC) become refractory and require second-line therapy. The multi-target receptor tyrosine kinase (RTK) inhibitor, sunitinib, is one of the few options, especially in patients with thymic carcinomas, and has resulted in partial remissions and prolonged overall survival. However, sunitinib shows variable activity in thymomas, and not all patients benefit equally. A better understanding of its mode of action and the definition of predictive biomarkers would help select patients who profit most. Methods: Six cell lines were treated with sunitinib in vitro. Cell viability was measured by MTS assay and used to define in vitro responders and non-responders. A quantitative real-time assay simultaneously measuring the phosphorylation of 144 tyrosine kinase substrates was used to correlate cell viability with alterations of the phospho-kinome, calculate a sunitinib response index (SRI), and impute upstream tyrosine kinases. Sunitinib was added to protein lysates of 29 malignant TH and TC. Lysates were analyzed with the same phosphorylation assay. The SRI tentatively classified cases into potential clinical responders and non-responders. In addition, the activation patterns of 44 RTKs were studied by phospho-RTK arrays in 37 TH and TC. Results: SRI application separated thymic epithelial tumors (TET) in potential sunitinib responders and resistant cases. Upstream kinase prediction identified multiple RTKs potentially involved in sunitinib response, many of which were subsequently shown to be differentially overexpressed in TH and TC. Among these, TYRO3/Dtk stood out since it was exclusively present in metastatic TH. The function of TYRO3 as a mediator of sunitinib resistance was experimentally validated in vitro. Conclusions: Using indirect and direct phosphoproteomic analyses to predict sunitinib response in malignant TET, we have shown that TH and TC express multiple important sunitinib target RTKs. Among these, TYRO3 was identified as a potent mediator of sunitinib resistance activity, specifically in metastatic TH. TYRO3 may thus be both a novel biomarker of sunitinib resistance and a potential therapeutic target in advanced thymomas and thymic carcinomas. | ||
| 650 | 4 | |a biomarker | |
| 650 | 4 | |a drug response | |
| 650 | 4 | |a phosphoproteomics | |
| 650 | 4 | |a sunitinib | |
| 650 | 4 | |a thymic carcinoma | |
| 650 | 4 | |a thymoma | |
| 650 | 4 | |a TYRO3 | |
| 650 | 4 | |a tyrosine kinase | |
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