Immunomodulative Efficacy of Bone Marrow-Derived Mesenchymal Stem Cells Cultured in Human Platelet Lysate
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Human mesenchymal stem cells (hMSCs) are considered to be a promising tool for novel cell-based therapies. Clinical applications in solid organ transplantation were hampered by the dependence on animal serum for hMSCs clinical scale expansion until substitution with human platelet lysate (HPL) became a promising alternative. Therefore we focused on a direct comparison of immunomodulatory properties of hMSCs cultured in HPL or fetal calf serum (FCS). Phenotypic characterization, detection of cytokine secretion and effects on alloantigen- and mitogen-induced lymphocyte proliferation as well as degranulation of cytomegalovirus-specific cytotoxic T cells were applied in potency assays. We demonstrated that HPL-cultured MSCs have comparable immunomodulatory capacities to their FCS-cultured counterparts. The observed immunomodulatory properties include a beneficial inhibitory effect on immune cell proliferation and an unaffected viral T cell immunity. Thus, culturing hMSCs in HPL generates an efficient and safe expansion combined with intriguing immunomodulatory properties making these cells an attractive cell therapeutic tool.
KeywordsImmunomodulation mesenchymal stem cell human platelet lysate cell therapy
This study was supported by the BCRT (Federal Ministry for Education and Research (BMBF) funded), the Austrian Research Foundation (FWF, grant N211-NAN; DS), and The Adult Stem Cell Research Foundation (TASCRF; DS). We gratefully thank Elke Effenberger and Claudia Url for skilful technical assistance and Monica Farrell for editorial assistance. We would also like to thank the FACS core facility of the BCRT led by Desireé Kunkel for excellent technical support.
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