Different pro-angiogenic potential of γ-irradiated PBMC-derived secretome and its subfractions

Tanja Wagner, Denise Traxler, Elisabeth Simader, Lucian Beer, Marie Sophie Narzt, Florian Gruber, Sibylle Madlener, Maria Laggner, Michael Erb, Vera Vorstandlechner, Alfred Gugerell, Christine Radtke, Massimiliano Gnecchi, Anja Peterbauer, Maria Gschwandtner, Erwin Tschachler, Claudia Keibl, Paul Slezak, Hendrik J. Ankersmit, Michael Mildner

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Abstract

Secretomes from various cell sources exert strong regenerative activities on numerous organs, including the skin. Although secretomes consist of many diverse components, a growing body of evidence suggests that small extracellular vesicles (EVs) account for their regenerative capacity. We previously demonstrated that the secretome of γ-irradiated peripheral blood mononuclear cells (PBMCs) exhibits wound healing capacity. Therefore, we sought to dissect the molecular composition of EVs present in the secretome and compared wound healing-related activities of these EVs to other subfractions of the secretome and the fully supplemented secretome (MNCaposec). Compared to EVs derived from non-irradiated PBMCs, γ-irradiation significantly increased the size and number and changed the composition of released EVs. Detailed characterization of the molecular components of EVs, i.e. miRNA, proteins, and lipids, derived from irradiated PBMCs revealed a strong association with regenerative processes. Reporter gene assays and aortic ring sprouting assays revealed diminished activity of the subfractions compared to MNCaposec. In addition, we showed that MNCaposec accelerated wound closure in a diabetic mouse model. Taken together, our results suggest that secretome-based wound healing represents a promising new therapeutic avenue, and strongly recommend using the complete secretome instead of purified subfractions, such as EVs, to exploit its full regenerative capacity.

Original languageEnglish
Article number18016
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - Dec 1 2018

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Wagner, T., Traxler, D., Simader, E., Beer, L., Narzt, M. S., Gruber, F., Madlener, S., Laggner, M., Erb, M., Vorstandlechner, V., Gugerell, A., Radtke, C., Gnecchi, M., Peterbauer, A., Gschwandtner, M., Tschachler, E., Keibl, C., Slezak, P., Ankersmit, H. J., & Mildner, M. (2018). Different pro-angiogenic potential of γ-irradiated PBMC-derived secretome and its subfractions. Scientific Reports, 8(1), [18016]. https://doi.org/10.1038/s41598-018-36928-6