Fang CH, Cheng B, Fan YF. Biological characteristics of immortalized bone marrow mesenchymal stem cells.
Shijie Huaren Xiaohua Zazhi 2009;
17:882-885. [DOI:
10.11569/wcjd.v17.i9.882]
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Abstract
AIM: To study biological characteristics of immortalizing bone marrow mesenchymal stem cells (BMSCs).
METHODS: Plasmid pCMVSV40T/PUR containing the simian virus 40 large T antigene gene (SV40Tag) was transfected into BMSCs. The cell shape of immortalized BMSCs was observed. Its capacity to differentiate into osteoblast cells was detected through the activity of ALP. Its tumorigenicity was examined using the nude mice experiment. Growth curve of cells in different serum concentration culture was described and its activity was measured.
RESULTS: Untreated BMSCs, after fifteenth passages, could not passage, while immortalized BMSCs of this passage preserved good activity but with contact inhibition. Immortalized BMSCs differentiated into osteoblasts. The cells, which were injected into nude mice, had no tumorigenicity. The immortalized BMSCs, cultured in 20% serum concentration, growed faster than that in other serum concentrations. The activity of immortalized BMSCs, which were frozen by 50% and 90% of serum concentration, were higher than that of 20%.
CONCLUSION: In vitro, the immortalized BMSCs, with pCMVSV40T/PUR, have good activity, but no tumorigenicity. The immortalized BMSCs can provide a large number of cells.
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