Off-the-shelf availability of human adipose-derived mesenchymal stromal cells (ASCs) for regenerative medicine application requires the development of nontoxic, safe, and efficient protocols for cryopreservation. Favorably, such cell processing protocols should not contain xenogeneic or toxic components, such as fetal bovine serum (FS) and dimethyl sulfoxide (DMSO). The objective of the study was to assess the sensitivity of ASCs to DMSO-free cryopreservation protocol depending on their expansion conditions: conventional, based on the application of FS or xeno-free, using PL as a medium supplement. ASCs expansion was carried out in α-MEM supplemented either with FS or PL. For DMSO- and xeno-free cryopreservation ASCs were pretreated with different concentrations of sucrose during 24 h of culture. Pretreated ASCs were cryopreserved in α-MEM containing 100-300 mM of sucrose with the cooling rate of 1 degree/min. ASCs were tested for survival (Trypan Blue test), viability (MTT test), recovery (Alamar Blue test), proliferation and ability to multilineage differentiation. The optimal concentrations of sucrose for ASCs pretreatment and as an additive in cryoprotective solution, which provided highest cell survival, comprised 100 and 200 mM, correspondingly. Survival and recovery rates of platelet lysate (PL)-expanded ASCs after DMSO-free cryopreservation comprised 59 and 51%, and were higher than in FS-cultured cells. After DMSO-free cryopreservation PL-processed ASCs had a shorter population doubling time and higher capacity for osteogenic differentiation than FS-processed cultures. The described DMSO- and xeno-free processing may form the basis for the development of safe and efficient protocols for manufacturing and banking of ASCs, providing their off-the-shelf availability for regenerative medicine applications.

Department of Biochemistry Institute for Problems of Cryobiology and Cryomedicine of National Academic of Sciences of Ukraine Pereyaslavskaya 23 Kharkiv 61015 Ukraine

Institute of Experimental Medicine AS CR v v i Vídeňská 1083 142 20 Prague 4 Krč Czech Republic

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Novel Cryopreservation Approach Providing Off-the-Shelf Availability of Human Multipotent Mesenchymal Stromal Cells for Clinical Applications