STATIONARY PHASE OF CULTURED MAMMALIAN CELLS (L5178Y)

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Abstract
The stationary phase of the mammalian cells L5178Y in culture can be divided into two stages: (a) an early phase characterized by the decline of mitotic index, followed by a stabilization of the cell number, and (b) a late stage, occurring several hours after the flattening of the growth curve, during which dead or dying cells appear in the cultures. The estimates of rates of cell progress showed that the rates from G1 to S and from G2 to M were affected in the early stationary phase. The main cause of cessation of increase in cell number in the early stationary phase is resulted from the decline in mitotic index, which is caused by prolongation of the G2 period. The importance of the G2 stage in regulating the cell growth is discussed in relation to other known situations in the literature.