PuSH - Publikationsserver des Helmholtz Zentrums München: The miRNA content of bone marrow-derived extracellular vesicles contributes to protein pathway alterations involved in ionising radiation-induced bystander responses.

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Csordás, I.B.* ; Rutten, E.A.* ; Szatmári, T.* ; Subedi, P. ; Cruz-Garcia, L.* ; Kis, D.* ; Jezsó, B.* ; von Toerne, C. ; Forgács, M.* ; Sáfrány, G.* ; Tapio, S. ; Badie, C.* ; Lumniczky, K.*

The miRNA content of bone marrow-derived extracellular vesicles contributes to protein pathway alterations involved in ionising radiation-induced bystander responses.

Int. J. Mol. Sci. 24:25 (2023)

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Extracellular vesicles (EVs), through their cargo, are important mediators of bystander responses in the irradiated bone marrow (BM). MiRNAs carried by EVs can potentially alter cellular pathways in EV-recipient cells by regulating their protein content. Using the CBA/Ca mouse model, we characterised the miRNA content of BM-derived EVs from mice irradiated with 0.1 Gy or 3 Gy using an nCounter analysis system. We also analysed proteomic changes in BM cells either directly irradiated or treated with EVs derived from the BM of irradiated mice. Our aim was to identify key cellular processes in the EV-acceptor cells regulated by miRNAs. The irradiation of BM cells with 0.1 Gy led to protein alterations involved in oxidative stress and immune and inflammatory processes. Oxidative stress-related pathways were also present in BM cells treated with EVs isolated from 0.1 Gy-irradiated mice, indicating the propagation of oxidative stress in a bystander manner. The irradiation of BM cells with 3 Gy led to protein pathway alterations involved in the DNA damage response, metabolism, cell death and immune and inflammatory processes. The majority of these pathways were also altered in BM cells treated with EVs from mice irradiated with 3 Gy. Certain pathways (cell cycle, acute and chronic myeloid leukaemia) regulated by miRNAs differentially expressed in EVs isolated from mice irradiated with 3 Gy overlapped with protein pathway alterations in BM cells treated with 3 Gy EVs. Six miRNAs were involved in these common pathways interacting with 11 proteins, suggesting the involvement of miRNAs in the EV-mediated bystander processes. In conclusion, we characterised proteomic changes in directly irradiated and EV-treated BM cells, identified processes transmitted in a bystander manner and suggested miRNA and protein candidates potentially involved in the regulation of these bystander processes.

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