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Mol. Cell. Biol., Apr 1996, 1335-1341, Vol 16, No. 4
W Poluha, DK Poluha, B Chang, NE Crosbie, CM Schonhoff, DL Kilpatrick and AH Ross
We are employing recent advances in the understanding of the cell cycle to
study the inverse relationship between proliferation and neuronal
differentiation. Nerve growth factor and aphidicolin, an inhibitor of DNA
polymerases, synergistically induce neuronal differentiation of SH- SY5Y
neuroblastoma cells and the expression of p21WAF1, an inhibitor of
cyclin-dependent kinases. The differentiated cells continue to express
p21WAF1, even after removal of aphidicolin from the culture medium. The
p21WAF1 protein coimmunoprecipitates with cyclin E and inhibits cyclin
E-associated protein kinase activity. Each of three antisense
oligonucleotides complementary to p21WAF1 mRNA partially blocks expression
of p21WAF1 and promotes programmed cell death. These data indicate that
p21WAF1 expression is required for survival of these differentiating
neuroblastoma cells. Thus, the problem of neuronal differentiation can now
be understood in the context of negative regulators of the cell cycle.
Copyright © 1996, American Society for Microbiology
The cyclin-dependent kinase inhibitor p21 (WAF1) is required for survival of differentiating neuroblastoma cells
Worcester Foundation for Biomedical Research, Shrewsbury, Massachusetts 01545, USA.
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