Abstract: ObjectiveTo validate the feasibility of the outer space carrying system in culturing the CHO(dhfr^-)cells in hypothermia, and to observe the effects of this carrying system on the growth characteristics of the CHO(dhfr^-) cells.MethodsThe growth characteristics of the CHO(dhfr^-) cells were observed and analyzed with cell morphological observation, MTT assay, FCM,³H incorporation and chromosome after the cells were cultured for 25 days in the carrying system. ResultsComparing with the control group, the CHO(dhfr^-) cells appeared multiple cell morphological changes, the difference of cell cycle was not significant, the broken chromosome was not seen, the cell growth speed decreased markedly and big molecular biosynthesis increased obviously. ConclusionThe outer space carrying system has no outstanding effects on the survival and heredity of the CHO(dhfr^-) cells, so that it can be used in cell carry.

Key words: hypothermia, outer space carrying system, CHO(dhfr^-) cell, growth characteristics