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. 1994 Dec 15;13(24):5922–5928. doi: 10.1002/j.1460-2075.1994.tb06937.x

Proliferative inhibition by dominant-negative Ras rescues naive and neuronally differentiated PC12 cells from apoptotic death.

G Ferrari 1, L A Greene 1
PMCID: PMC395567  PMID: 7813431

Abstract

We have used the nerve growth factor (NGF)-responsive PC12 cell line as a model to examine the role of cell cycle progression in apoptotic neuronal cell death triggered by withdrawal of trophic support. Because p21 Ras plays a key role in mitogenic signaling, we tested whether interference with the activity of this protein would affect cell cycle progression and thereby apoptotic death after trophic factor deprivation. For this purpose, we exploited PC12 cells transfected with an inducible form of dominant-inhibitory Ras. In contrast to non-transfected and uninduced cells, which continue to synthesize DNA when deprived of trophic support, PC12 cells induced to express dominant-inhibitory Ras showed little thymidine incorporation. When non-transfected and uninduced cells were deprived of trophic support, these underwent rapid apoptotic death that could be prevented by NGF. However, cells in which dominant-inhibitory Ras was induced and which were consequently quiescent did not die upon withdrawal of trophic support and showed long-term survival in the absence of NGF or other trophic factors. Moreover, induction of dominant-inhibitory Ras also rescued non-dividing, neuronally differentiated PC12 cells from death caused by NGF withdrawal. These findings suggest a relationship between proliferative capacity and neuronal apoptosis and raise the hypothesis that following withdrawal of trophic support, neurons undergo an unsuccessful and fatal attempt to re-enter the cell cycle.

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Selected References

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