Document Detail

Attenuation of p53 expression and Bax down-regulation during phorbol ester mediated inhibition of apoptosis.
MedLine Citation:
PMID:  9208127     Owner:  NLM     Status:  MEDLINE    
1. Nitric oxide (NO) caused apoptotic cell death in murine RAW 264.7 macrophages. Associated with apoptotic morphology we observed p53 up-regulation and increased Bax expression. 12-O-tetradecanoylphorbol-13-acetate (TPA), a protein kinase C (PKC) activator potently blocked NO-induced apoptosis. To gain insights into the mechanisms involved we investigated the effect of TPA on apoptotic conveying proteins such as p53 and Bax. 2. TPA (100 nM) attentuated p53 up-regulation elicited by the NO-releasing compounds, S-nitrosoglutathione (1 mM) and sodium nitroprusside (1 mM), and suppressed p53 protein accumulation in response to endogenously generated NO. Hence, TPA appeared to lower the steady state p53 level following its up-regulation by NO. 3. Mezerein, a stage 2 tumour promoter and PKC activating agent was equally active to TPA. Moreover, two potent PKC inhibitors, staurosporine (10 nM) and Go 6976 (50 nM), reversed the inhibitory effect of TPA. However, bisinoylmaleimide I (up to 500 nM) was ineffective. 4. By extending the studies, we revealed a TPA-mediated p53 down-regulation in response to etoposide (50 microM), mitomycin C (5 micrograms ml-1) and actinomycin D (2 micrograms ml-1). 5. With the notion that TPA suppressed apoptotic DNA fragmentation in p53 antisense expressing cells as well, we searched for additional inhibitory actions of TPA. As well as affecting p53, TPA elicited a rapid decline of the steady state level of Bax within 30 min. 6. We concluded that down-regulation of two classical apoptotic promoting proteins contributes to the anti-apoptotic action of mezerein and TPA.
U K Messmer; B Brüne
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of pharmacology     Volume:  121     ISSN:  0007-1188     ISO Abbreviation:  Br. J. Pharmacol.     Publication Date:  1997 Jun 
Date Detail:
Created Date:  1997-09-25     Completed Date:  1997-09-25     Revised Date:  2008-11-20    
Medline Journal Info:
Nlm Unique ID:  7502536     Medline TA:  Br J Pharmacol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  625-34     Citation Subset:  IM    
University of Erlangen-Nürnberg, Faculty of Medicine, Department of Medicine IV-Experimental Division, Erlangen, Germany.
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MeSH Terms
Antineoplastic Agents, Phytogenic / pharmacology
Apoptosis / drug effects*,  genetics
Genes, p53 / drug effects*,  genetics
Nitric Oxide / pharmacology
Nitric Oxide Synthase / metabolism
Proto-Oncogene Proteins / metabolism*
Proto-Oncogene Proteins c-bcl-2*
Terpenes / pharmacology
Tetradecanoylphorbol Acetate / pharmacology*
Tumor Suppressor Protein p53 / metabolism*
bcl-2-Associated X Protein
Reg. No./Substance:
0/Antineoplastic Agents, Phytogenic; 0/Bax protein, mouse; 0/Diterpenes; 0/Proto-Oncogene Proteins; 0/Proto-Oncogene Proteins c-bcl-2; 0/Terpenes; 0/Tumor Suppressor Protein p53; 0/bcl-2-Associated X Protein; 10102-43-9/Nitric Oxide; 16561-29-8/Tetradecanoylphorbol Acetate; 34807-41-5/mezerein; EC Oxide Synthase

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