JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Evaluation of the viability and osteogenic differentiation of cryopreserved human adipose-derived stem cells.

Cryobiology 2008 August
Human adipose-derived stem cells (ASCs) have the ability to differentiate into osteoblasts and thus the potential therapeutic use to tissue-engineer bone, so a reliable method for cell storage is necessary. The aim of this study was to determine whether a simple method of cryopreservation with 10% Me(2)SO as a protectant had an effect on proliferation potential and osteogenic differentiation of ASCs isolated from fresh human adipose tissue. ASCs were harvested from 6 human lipoaspirates and each was halved for either cryopreservation in liquid nitrogen for 2 weeks or for control culture. Cells from the second-passage were plated at a density of 5000cells/well in 24-well plates and cultured with or without osteogenic media for 14 days. Cell surface antigens were used to identify the cryopreserved ASCs by flow cytometry. The proliferation rate of both populations was evaluated using a cell DNA assay. To detect osteogenic differentiation of both the cryopreserved and non-cryopreserved populations, determination of osteoblastic protein production (alkaline phosphatase and osteocalcin) and excellular matrix calcification (calcium content) was applied. The expression of osteoblastic-associated genes was also analyzed using reverse-transcription polymerase chain reaction. These results demonstrate that cryopreservation has no effect on the phenotype, proliferation or osteogenic differentiation of human ASCs, showing cryopreserved human ASCs might be applied for bone tissue engineering.

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