Exosomes impact survival to radiation exposure in cell line models of nervous system cancer
| Autor: | Oliver D. Mrowczynski, James R. Connor, Elias Rizk, Yuanjun Zhao, Russell Payne, Becky Slagle-Webb, Jeffrey M. Sundstrom, Yuka Imamura Kawasawa, A. B. Madhankumar, Brad E. Zacharia, Christine Mau |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
glioblastoma Cancer exosomes Cell cycle Biology medicine.disease Exosome Microvesicles In vitro radiation resistance 03 medical and health sciences 030104 developmental biology 0302 clinical medicine Oncology Mechanism of action Downregulation and upregulation glioma 030220 oncology & carcinogenesis Cancer cell medicine Cancer research medicine.symptom Research Paper |
| Zdroj: | Oncotarget |
| ISSN: | 1949-2553 |
| Popis: | Radiation is utilized in the therapy of more than 50% of cancer patients. Unfortunately, many malignancies become resistant to radiation over time. We investigated the hypothesis that one method of a cancer cell's ability to survive radiation occurs through cellular communication via exosomes. Exosomes are cell-derived vesicles containing DNA, RNA, and protein. Three properties were analyzed: 1) exosome function, 2) exosome profile and 3) exosome uptake/blockade. To analyze exosome function, we show radiation-derived exosomes increased proliferation and enabled recipient cancer cells to survive radiation in vitro. Furthermore, radiation-derived exosomes increased tumor burden and decreased survival in an in vivo model. To address the mechanism underlying the alterations by exosomes in recipient cells, we obtained a profile of radiation-derived exosomes that showed expression changes favoring a resistant/proliferative profile. Radiation-derived exosomes contain elevated oncogenic miR-889, oncogenic mRNAs, and proteins of the proteasome pathway, Notch, Jak-STAT, and cell cycle pathways. Radiation-derived exosomes contain decreased levels of tumor-suppressive miR-516, miR-365, and multiple tumor-suppressive mRNAs. Ingenuity pathway analysis revealed the most represented networks included cell cycle, growth/survival. Upregulation of DNM2 correlated with increased exosome uptake. To analyze the property of exosome blockade, heparin and simvastatin were used to inhibit uptake of exosomes in recipient cells resulting in inhibited induction of proliferation and cellular survival. Because these agents have shown some success as cancer therapies, our data suggest their mechanism of action could be limiting exosome communication between cells. The results of our study identify a novel exosome-based mechanism that may underlie a cancer cell's ability to survive radiation. |
| Databáze: | OpenAIRE |
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