INDUCING ARSENIC-RESISTANCE CELLS WITH HUMAN BONE MARROW-DERIVED MESENCHYMAL STEM CELLS / 解剖学报

ABSTRACT

Objective To obtain stable arsenic-resistance cells,the fetal bone marrow mesenchymal stem cells(BMSCs)were exposed to low-level arsenite for 18 weeks. Methods Cells from 4 months fetal bone marrow were cultured in ?-MEM medium to obtain BMSCs.After 24h cytotoxicity test of the fetal BMSCs,we chosed 1?mol/L NaAsO_2 to be the dose under which the cell death-rate was 5%-10%.The fetal BMSCs were exposed to low-level arsenite.MTT was used to detect the survival rate and IC_(50) of arsenic-exposed cells and the control cells,which can reflect the change of arsenic tolerance.A hydride generationatomic fluorescence spectrometry method was used to detect arsenic in the arsenic-resistance cells and the control cells.In order to study the mechanism of arsenic-resistance,we also examined the intracellular GSH and GST content in the arsenic-resistance cells and the control cells. Results The fetal BMSCs were continuously exposed to 1?mol/L NaAsO_2.Parallel cells were cultured in medium without arsenic provided passage-matched control.After the fetal BMSCs were continuously exposed to low level NaAsO_2 for 18 weeks,cells exhibited dramatic resistance to acute arsenite toxicity.Compared to control cells,arsenic-resistance cells showed reduction in arsenic accumulation in cells.The GSH levels and GST activity of arsenic-resistance cells were higher than that of control cells.Conclusion Acquisition of stable arsenic-resistance in BMSCs was available by using cell culture and adding low-level arsenic.Our research established a solid basis for further study about the mechanisms of arsenic-resistance in human being.