Document Detail

Up-regulation and functional role of p21Waf1/Cip1 during growth arrest of human breast carcinoma MCF-7 cells by phenylacetate.
MedLine Citation:
PMID:  8959328     Owner:  NLM     Status:  MEDLINE    
Phenylacetate (PA) and related aromatic fatty acids constitute a novel class of relatively nontoxic antineoplastic agents. These compounds induce tumor cytostasis and growth inhibition and differentiation of cancer cells, but little is known regarding the molecular events mediating these biological effects. Using human breast carcinoma MCF-7 cells as a model, we show here that PA-induced growth arrest is associated with enhanced expression of the cyclin-dependent kinase inhibitor p21Waf1/Cip1 and dephosphorylation of the retinoblastoma protein (pRB). The induction of p21WAF1/CIP1 mRNA by PA was independent of the cellular p53 status. To directly assess the contribution of p21Waf1/Cip1 to PA-mediated cytostasis, we compared the effects of PA in parental MCF-7 cells and cells expressing reduced levels of p21Waf1/Cip1 protein (clones AS.3 and AS.4), accomplished through constitutive expression of antisense p21Waf1/Cip1 transcripts. In contrast to parental cells, AS.3 and AS.4 cells did not show reduced pRB phosphorylation following PA treatment, indicating that p21Waf1/Cip1 induction by PA is required for dephosphorylation (inactivation) of pRB, a known mediator of cell cycle control. A prominent role for p21Waf1/Cip1 in mediating PA-induced growth arrest was further supported by the demonstration that embryonal fibroblasts derived from a p21WAF1/CIP1 knockout mouse (p21-/- mouse embryonal fibroblasts) did not growth arrest following PA treatment, whereas PA effectively induced p21WAF1/CIP1 mRNA and growth inhibition of the wild-type mouse embryonal fibroblasts. Taken together, our findings strongly support a role for p21Waf1/Cip1 in the PA-mediated inhibition of cell growth.
M Gorospe; S Shack; K Z Guyton; D Samid; N J Holbrook
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Cell growth & differentiation : the molecular biology journal of the American Association for Cancer Research     Volume:  7     ISSN:  1044-9523     ISO Abbreviation:  Cell Growth Differ.     Publication Date:  1996 Dec 
Date Detail:
Created Date:  1997-03-07     Completed Date:  1997-03-07     Revised Date:  2012-06-25    
Medline Journal Info:
Nlm Unique ID:  9100024     Medline TA:  Cell Growth Differ     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1609-15     Citation Subset:  IM    
Laboratory of Cellular and Molecular Biology, Gerontology Research Center, National Institute on Aging, NIH, Baltimore, Maryland 21224, USA.
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MeSH Terms
Antimetabolites, Antineoplastic / pharmacology*
Antisense Elements (Genetics)
Breast Neoplasms
CDC2-CDC28 Kinases*
Calcium-Calmodulin-Dependent Protein Kinases / metabolism
Cell Division / drug effects
Cyclin-Dependent Kinase 2
Cyclin-Dependent Kinase Inhibitor p21
Cyclin-Dependent Kinases / genetics,  metabolism
Cyclins / genetics,  metabolism*
Enzyme Inhibitors / metabolism*
Fibroblasts / cytology,  drug effects,  enzymology
Gene Expression Regulation, Neoplastic / physiology
Mice, Knockout
Phenylacetates / pharmacology*
Protein-Serine-Threonine Kinases / genetics,  metabolism
RNA, Messenger / metabolism
Retinoblastoma Protein / metabolism
Signal Transduction / physiology
Tumor Cells, Cultured / cytology,  drug effects,  enzymology
Up-Regulation / drug effects
Reg. No./Substance:
0/Antimetabolites, Antineoplastic; 0/Antisense Elements (Genetics); 0/CDKN1A protein, human; 0/Cdkn1a protein, mouse; 0/Cyclin-Dependent Kinase Inhibitor p21; 0/Cyclins; 0/Enzyme Inhibitors; 0/Phenylacetates; 0/RNA, Messenger; 0/Retinoblastoma Protein; 103-82-2/phenylacetic acid; EC Kinases; EC Protein Kinases; EC Kinases; EC protein, human; EC protein, mouse; EC Kinase 2; EC Kinases

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