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02.Characterization of Human Adipose-Derived Stem Cells Cultured in Autologous Serum after Subsequent Passaging and Long Term Cryopreservation
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Characterization of Human Adipose-Derived Stem Cells Cultured in Autologous Serum after Subsequent Passaging and Long Term Cryopreservation $45.00
Authors:  Ance Bogdanova, Uldis Berzins, Sergey Nikulshin, Dace Skrastina, Agnese Ezerta, Diana Legzdina, and Tatjana Kozlovska
Abstract:
The aim of this study was to evaluate human adipose-derived stem cells (ASCs) from passage 2 (P2) to P8 cultured in medium containing 5% autologous serum (AS) after a long-term cryopreservation with regards to their surface marker expression, differentiation potential, and immunosuppressive effect in vitro. 8-color flow cytometry and real time PCR were used to determine mesenchymal stem cell (MSC) surface marker expression on ASCs from various passages. In vitro differentiation ability and immunomodulatory properties of ASCs were also tested. Flow cytometry showed that all ASCs express typical
MSC markers CD29, CD44, CD73, CD90, CD105 simultaneously, but do not express such markers as HLA-DR, CD34, CD14, CD19, and CD45. Furthermore, median fluorescence intensity of positive cell surface markers increased with each subsequent passage indicating the accumulation of protein expression. The multilineage differentiation demonstrated the ability of ASCs from P6 to efficiently differentiate into adipocytes and chondrocytes, but their potential of osteogenic differentiation was diminished. Data from co-culture of ASCs and autologous peripheral blood mononuclear cells (PBMNCs) indicated that ASCs from P3, P6, and P9 significantly reduce the proliferation of PBMNCs at ASCs:PBMNCs ratio 1:1 and this suppression is dose dependent. This study demonstrated that ASCs from P2 to P8, cultured in the presence of AS, represent a highly homogeneous cell population with a peak accumulation of MSC surface proteins at P5 possessing multilineage differentiation ability and significant immunosuppressive properties after double freezing and more than 4 years of cryopreservation. 


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Characterization of Human Adipose-Derived Stem Cells Cultured in Autologous Serum after Subsequent Passaging and Long Term Cryopreservation