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Post-transcriptional destabilization of p21cip1 by protein kinase C in fibroblasts. | LitMetric
p21(cip1) inhibits S phase entry by binding to cyclin-cdk2 (cyclin-dependent kinase-2) complexes. The levels of p21(cip1) are rapidly induced after mitogenic stimulation of quiescent fibroblasts and then down-regulate as the cells reach late G(1) phase and activate cyclin E-cdk2. In this study, we have shown that pharmacological inhibition of protein kinase C (PKC), expression of dominant negative PKCdelta, or knockdown of PKCdelta with small interfering RNA elevates p21(cip1) protein levels in mouse embryo fibroblasts. This effect is selective, post-transcriptional, and proteasome-dependent but distinct from previously identified post-transcriptional control mechanisms involving cyclin D1 and Skp2. PKCdelta inhibition results in a reduced entry into S phase, and this effect is not detected in p21(cip1)-null cells. Thus, post-transcriptional destabilization of p21(cip1) appears to be a major mitogenic effect of PKCdelta in fibroblasts.
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