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Effects of suberoylanilide hydroxamic acid and trichostatin A on induction of cytochrome P450 enzymes and benzo[a]pyrene DNA adduct formation in human cells.

Authors
Hooven-LA; Mahadevan-B; Keshava-C; Johns-C; Pereira-C; Desai-D; Amin-S; Weston-A; Baird-WM
Source
Bioorg Med Chem Lett 2005 Mar; 15(5):1283-1287
NIOSHTIC No.
20026184
Abstract
In this study, we investigated the effects of histone deacetylase (HDAC) inhibitors suberoylanilide hydroxamic acid (SAHA) and trichostatin A (TSA) on the metabolism of polycyclic aromatic hydrocarbons (PAH) in human mammary carcinoma derived MCF-7 cells in culture. Benzo[a]pyrene (B[a]P) induces cytochrome P450 (CYP) 1A1, CYP1B1 and other xenobiotic metabolizing enzymes. Results from our study indicated a significant increase in CYP activity in comparison to vehicle control in cells treated with SAHA or TSA as measured by ethoxyresorufin-O-deethylase assay. However, co-treatment with 1.0muM SAHA and BP, reduced the mRNA levels of CYP1B1 relative to B[a]P alone. When co-treated with 1.0muM TSA and BP, a reduction in the mRNA levels of both CYP1A1 and CYP1B1 was observed relative to BP alone. We further investigated to ascertain if the differential expression and activity of CYP1A1 and CYP1B1 influenced levels of B[a]P DNA adduct formation. MCF-7 cells co-treated with B[a]P and SAHA or TSA formed DNA adducts, although no significant differences in levels of DNA binding were revealed. These results suggest that while CYP enzyme activity and gene expression were affected by the HDAC inhibitors SAHA and TSA, they had no apparent influence on B[a]P DNA binding.
Keywords
Acids; Enzymes; Polycyclic-aromatic-hydrocarbons; Humans; Cell-cultures; Metabolism; Benzopyrenes
CODEN
BMCLE8
CAS No.
50-32-8
Publication Date
20050301
Document Type
Journal Article
Email Address
william.baird@orst.edu
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Issue of Publication
5
ISSN
0960-894X
NIOSH Division
HELD
Source Name
Bioorganic & Medicinal Chemistry Letters
State
WV; OR; NY
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