Abstract
Human mesenchymal stem cells were exposed to diabetic sera for 7 days. Cell viability and apoptosis rate were detected by MTT and flow cytometry assays. The expression of key genes such as CD63, Alix, Rab27a, Rab27b, and Rab8b was monitored by real-time PCR. We also measured acetylcholinesterase activity and size and zeta potential of exosomes in the supernatant form diabetic cells and control. The cellular distribution of CD63 was shown by immunofluorescence imaging and western blotting. Any changes in the ultrastructure of cells were visualized by electron microscopy. Data showed a slight decrease in survival rate and an increased apoptosis in diabetic cells as compared to control (p < 0.05). By exposing cells to diabetic sera, a significant increase in the level of all genes CD63, Alix, Rab27a, Rab27b, and Rab8b was observed (p < 0.05). Flow cytometry analysis and immunofluorescence imaging confirmed increasing CD63 protein content upon treatment with diabetic sera (p < 0.05). We found an enhanced acetylcholinesterase activity in a diabetic condition which coincided with the increasing size of exosomes and decrease in zeta potential (p < 0.05). The fatty acid profile was not significantly affected by diabetic sera. Ultrastructural examination detected more accumulated cytoplasmic lipid vacuoles in diabetic cells.
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Acknowledgments
The authors gratefully thank the personnel of Stem Cell Research Center, Tabriz University of Medical Sciences.
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This work was supported by a grant (no. TBZMED.REC.1394.928) from the Research Council, Tabriz University of Medical Sciences.
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All volunteers were asked to fill out an informed consent. All procedures performed through the current experiment, involving human participants, were in accordance with the local ethics committee of Tabriz University of Medical Sciences (Ethical code no. TBZMED.REC.1394.928) and ethical principles of Declaration of Helsinki.
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Rezaie, J., Nejati, V., Khaksar, M. et al. Diabetic sera disrupted the normal exosome signaling pathway in human mesenchymal stem cells in vitro. Cell Tissue Res 374, 555–565 (2018). https://doi.org/10.1007/s00441-018-2895-x
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DOI: https://doi.org/10.1007/s00441-018-2895-x