Induction of p21 (WAF-1/CIP1) during differentiation - PubMed (original) (raw)
. 1994 Nov;9(11):3389-96.
Affiliations
- PMID: 7936667
Induction of p21 (WAF-1/CIP1) during differentiation
R A Steinman et al. Oncogene. 1994 Nov.
Abstract
The recently cloned protein, p21 (WAF1/CIP1) is a downstream effector of p53, and mediates growth arrest by inhibiting the action of G1 cyclin-dependent kinases. Since cellular differentiation is frequently characterized by G1 arrest, we examined whether p21 upregulation occurs in differentiation. We show that p21 expression is triggered by multiple differentiation-inducing agents in hematopoietic and hepatoma cells through a p53-independent pathway. The dramatic rise in p21 levels occurs as an immediate early response to differentiation inducers. The induction of p21 is coupled to the expression of early differentiation markers, and is uncoupled from apoptosis. Finally, evidence is presented that p21 expression is uncoupled from G1 arrest in the presence of deregulated c-myc.
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