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Article

Hypoxic Conditions Promote the Angiogenic Potential of Human Induced Pluripotent Stem Cell-Derived Extracellular Vesicles

1
Cell Therapy Institute, Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University (PMU), 5020 Salzburg, Austria
2
Department of Transfusion Medicine and SCI-TReCS, Paracelsus Medical University (PMU), 5020 Salzburg, Austria
3
Department of Cardiac, Thoracic, Transplantation and Vascular Surgery, Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Hannover Medical School, 30625 Hannover, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Bruno Bonetti
Int. J. Mol. Sci. 2021, 22(8), 3890; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms22083890
Received: 26 March 2021 / Revised: 6 April 2021 / Accepted: 7 April 2021 / Published: 9 April 2021
(This article belongs to the Special Issue Extracellular Vesicles in Inflammation)
Stem cells secrete paracrine factors including extracellular vesicles (EVs) which can mediate cellular communication and support the regeneration of injured tissues. Reduced oxygen (hypoxia) as a key regulator in development and regeneration may influence cellular communication via EVs. We asked whether hypoxic conditioning during human induced pluripotent stem cell (iPSC) culture effects their EV quantity, quality or EV-based angiogenic potential. We produced iPSC-EVs from large-scale culture-conditioned media at 1%, 5% and 18% air oxygen using tangential flow filtration (TFF), with or without subsequent concentration by ultracentrifugation (TUCF). EVs were quantified by tunable resistive pulse sensing (TRPS), characterized according to MISEV2018 guidelines, and analyzed for angiogenic potential. We observed superior EV recovery by TFF compared to TUCF. We confirmed hypoxia efficacy by HIF-1α stabilization and pimonidazole hypoxyprobe. EV quantity did not differ significantly at different oxygen conditions. Significantly elevated angiogenic potential was observed for iPSC-EVs derived from 1% oxygen culture by TFF or TUCF as compared to EVs obtained at higher oxygen or the corresponding EV-depleted soluble factor fractions. Data thus demonstrate that cell-culture oxygen conditions and mode of EV preparation affect iPSC-EV function. We conclude that selecting appropriate protocols will further improve production of particularly potent iPSC-EV-based therapeutics. View Full-Text
Keywords: extracellular vesicles (EV); induced pluripotent stem cells (iPSC); hypoxia; angiogenesis; regenerative medicine; hypoxia-inducible transcription factor (HIF) extracellular vesicles (EV); induced pluripotent stem cells (iPSC); hypoxia; angiogenesis; regenerative medicine; hypoxia-inducible transcription factor (HIF)
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MDPI and ACS Style

Andrade, A.C.; Wolf, M.; Binder, H.-M.; Gomes, F.G.; Manstein, F.; Ebner-Peking, P.; Poupardin, R.; Zweigerdt, R.; Schallmoser, K.; Strunk, D. Hypoxic Conditions Promote the Angiogenic Potential of Human Induced Pluripotent Stem Cell-Derived Extracellular Vesicles. Int. J. Mol. Sci. 2021, 22, 3890. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms22083890

AMA Style

Andrade AC, Wolf M, Binder H-M, Gomes FG, Manstein F, Ebner-Peking P, Poupardin R, Zweigerdt R, Schallmoser K, Strunk D. Hypoxic Conditions Promote the Angiogenic Potential of Human Induced Pluripotent Stem Cell-Derived Extracellular Vesicles. International Journal of Molecular Sciences. 2021; 22(8):3890. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms22083890

Chicago/Turabian Style

Andrade, André C., Martin Wolf, Heide-Marie Binder, Fausto G. Gomes, Felix Manstein, Patricia Ebner-Peking, Rodolphe Poupardin, Robert Zweigerdt, Katharina Schallmoser, and Dirk Strunk. 2021. "Hypoxic Conditions Promote the Angiogenic Potential of Human Induced Pluripotent Stem Cell-Derived Extracellular Vesicles" International Journal of Molecular Sciences 22, no. 8: 3890. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms22083890

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