Document Detail

Benzo[a]pyrene-7,8-dihydrodiol promotes checkpoint activation and G2/M arrest in human bronchoalveolar carcinoma H358 cells.
MedLine Citation:
PMID:  17114299     Owner:  NLM     Status:  MEDLINE    
Polycyclic aromatic hydrocarbons (PAHs) are potent carcinogens that require metabolic activation inside cells. The proximate carcinogens PAH-diols can be converted to o-quinones by aldo-keto reductases (AKRs) or to diol-epoxides by cytochrome P450 (P450) enzymes. We assessed the effect of benzo[a]pyrene-7,8-dihydrodiol (BPD) on proliferation in p53-null bronchoalveolar carcinoma H358 cells. BPD treatment led to a significant inhibition of proliferation and arrest in G2/M in H358 cells. The relative contribution of the AKR and P450 pathways to cell cycle arrest was assessed. Overexpression of AKR1A1 did not affect cell proliferation or cell cycle progression, and benzo[a]pyrene-7,8-dione did not cause any noticeable effect on cell growth, suggesting that AKR1A1 metabolic products were not involved in the antiproliferative effect of BPD. On the other hand, blockade of P450 induction or inhibition of P450 activity greatly impaired the effect of BPD. Moreover, P450 induction by 2,3,7,8-tetrachlorodibenzo-p-dioxin significantly enhanced the antiproliferative effect of BPD. Mechanistic studies revealed that BPD caused a DNA damage response, Chk1 activation, and accumulation of phospho-Cdc2 (Tyr15) in H358 cells, effects that were impaired by an ataxia-telangectasia mutated (ATM)/ATM-related (ATR) inhibitor. Similar results were observed in human bronchoepithelial BEAS-2B cells, arguing for analogous mechanisms in tumorigenic and immortalized nontumorigenic cells lacking functional p53. Our data suggest that a p53-independent pathway operates in lung epithelial cells in response to BPD that involves P450 induction and subsequent activation of the ATR/ATM/Chk1 damage check-point pathway and cell cycle arrest in G2/M.
M Cecilia Caino; Jose L Oliva; Hao Jiang; Trevor M Penning; Marcelo G Kazanietz
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2006-11-17
Journal Detail:
Title:  Molecular pharmacology     Volume:  71     ISSN:  0026-895X     ISO Abbreviation:  Mol. Pharmacol.     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-02-19     Completed Date:  2007-03-22     Revised Date:  2011-11-02    
Medline Journal Info:
Nlm Unique ID:  0035623     Medline TA:  Mol Pharmacol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  744-50     Citation Subset:  IM    
Department of Pharmacology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6160, USA.
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MeSH Terms
Adenocarcinoma, Bronchiolo-Alveolar / pathology*
Cell Division / drug effects*
Cell Line, Tumor
Cell Proliferation / drug effects
Cytochrome P-450 Enzyme System / physiology
DNA Damage
Dihydroxydihydrobenzopyrenes / metabolism,  pharmacology*
Enzyme Activation
G2 Phase / drug effects*
Lung Neoplasms / pathology*
Protein Kinases / physiology*
Grant Support
Reg. No./Substance:
0/Dihydroxydihydrobenzopyrenes; 13345-25-0/benzo(a)pyrene 7,8-dihydrodiol; 9035-51-2/Cytochrome P-450 Enzyme System; EC 2.7.-/Protein Kinases; EC kinase 1

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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