Insights into the Proteome of Gastrointestinal Stromal Tumors-Derived Exosomes Reveals New Potential Diagnostic Biomarkers*
| Autor: | Daniel W. Wilkey, Michael L. Merchant, Andrew K. Godwin, Mohammed M. Milhem, Safinur Atay |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Proteome Gastrointestinal Stromal Tumors Biology Exosomes Biochemistry Exosome Analytical Chemistry Metastasis 03 medical and health sciences 0302 clinical medicine Cell Line Tumor medicine Biomarkers Tumor Humans Stromal tumor Molecular Biology Gastrointestinal Neoplasms GiST Research medicine.disease Microvesicles Neoplasm Proteins 030104 developmental biology Imatinib mesylate 030220 oncology & carcinogenesis Cancer research Female Tyrosine kinase |
| Popis: | Developing tumors continuously release nano-sized vesicles that represent circulating “fingerprints” of the tumor's identity. In gastrointestinal stromal tumor (GIST), we have previously reported that these tumors release “oncosomes” carrying the constitutively activated tyrosine kinase (TK) receptor KIT. Despite the clinical utility of TK inhibitors, such as imatinib mesylate (IM), recurrence and metastasis are clinical problems that urge the need to identify new tumor-derived molecules. To this aim, we performed the first high quality proteomic study of GIST-derived exosomes (GDEs) and identified 1,060 proteins composing the core GDE proteome (cGDEp). The cGDEp was enriched in diagnostic markers (e.g. KIT, CD34, ANO1, PROM1, PRKCQ, and ENG), as well as proteins encoded by genes previously reported expressed in GIST (e.g. DPP4, FHL1, CDH11, and KCTD12). Many of these proteins were validated using cell lines, patient-derived KIT(+) exosomes, and GIST tissues. We further show that in vitro and in vivo-derived GDE, carry proteins associated with IM response, such as Sprouty homolog 4 (SPRY4), surfeit 4 (SURF4), ALIX, and the cGMP-dependent 3′,5′-cyclic phosphodiesterase 2A (PDE2A). Additionally, we report that the total exosome levels and exosome-associated KIT and SPRY4 protein levels have therapeutic values. In fact, molecular characterization of in vivo-derived KIT(+) exosomes indicate significant sorting of p-KIT(Tyr719), total KIT, and SPRY4 after IM-treatment of metastatic patients as compared with the pre-IM levels. Our data suggest that analysis of circulating exosomes levels and molecular markers of IM response in GIST patients with primary and metastatic disease is suitable to develop liquid based biopsies for the diagnosis, prognosis, and monitoring of response to treatment of these tumors. In summary, these findings provide the first insight into the proteome of GIST-derived oncosomes and offers a unique opportunity to further understand their oncogenic elements which contribute to tumorigenesis and drug resistance. Data are available via ProteomeXchange with identifier PXD007997. |
| Databáze: | OpenAIRE |
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