Proceedings of the National Academy of Sciences · 1999 · 175 citations · 40 references
Life SciencesCell BiologyMolecular BiologyCell CycleCell SignalingSignal TransductionCell Cycle TransitionsCell-cycle ArrestCell-cycle PhasesCell-cycle ProgressionMitotic EntryProtein Kinase CascadesCell Cycle DynamicsCell Cycle InhibitionDominant Negative EffectsMapk SignalingMitogen-activated Protein Kinase CascadesMitogen-activated Protein Kinase KinaseMitogen-activated Protein Kinase PathwaysMitogen-activated Protein Kinase Signaling
The mitogen-activated protein kinase (MAPK) cascade is required for mitogenesis in somatic mammalian cells and is activated by a wide variety of oncogenic stimuli. Specific roles for this signaling module in growth were dissected by inhibiting MAPK kinase 1 (MAPKK1) activity in highly synchronized NIH 3T3 cells. In addition to the known role of this kinase in cell-cycle entry from G(0), the level of MAPKK activity was observed to affect the kinetics of progression through both the G(1) and G(2) phases of the cell cycle in NIH 3T3 cells. Ectopic expression of dominant-negative forms of MAPKK1, which was previously shown to inhibit G(0)/G(1) progression, was found to also delay progression of cells through G(2). In addition, treatment of cells with the specific MAPKK inhibitor PD 98059 during a synchronous S phase arrested the cells in the following G(2) phase. These data demonstrate a novel role for the MAPK cascade in progression from G(2) into mitosis in NIH 3T3 cells.
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Transformation of Mammalian Cells by Constitutively Active MAP Kinase Kinase
Sam J. Mansour, Wayne T. Matten, April S. Hermann et al. · Science · 1994 · 1.4K citations