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Characterization of human CYP1A1/1A2 induction by DNA microarray and alpha-naphthoflavone
Seiichi Ishida1, Hideto Jinno, Toshiko Tanaka-Kagawa
1Project Team for Pharmacogenetics, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, 158-8501, Tokyo, Japan. ishida@nihs.go.jp
Biochemical and Biophysical Research Communications
|July 31, 2002
Summary
Beta-naphthoflavone and omeprazole induce specific genes in HepG2 cells. While omeprazole uses a protein tyrosine kinase pathway, alpha-naphthoflavone uniquely enhances CYP1A1 and CYP1A2 gene induction.
Area of Science:
- Molecular biology
- Pharmacology
- Hepatocellular carcinoma research
Background:
- CYP1A1 inducers like beta-naphthoflavone and omeprazole are used to study gene regulation.
- HepG2 cells, a human hepatocellular carcinoma line, are a model for studying drug metabolism and gene expression.
Purpose of the Study:
- To analyze the gene induction mechanisms of CYP1A1 inducers, beta-naphthoflavone and omeprazole, in HepG2 cells.
- To investigate the differential regulation of CYP1A1 and CYP1A2 genes compared to other induced genes.
Main Methods:
- DNA microarrays and real-time PCR were employed to analyze gene expression.
- HepG2 cells were treated with beta-naphthoflavone and omeprazole.
Main Results:
- Significant induction of CYP1A1 and CYP1A2 genes was observed, with distinct induction ratios compared to other genes.
- Omeprazole modulated gene expression via a protein tyrosine kinase-mediated pathway.
- Alpha-naphthoflavone inhibited induction of some genes but unexpectedly enhanced CYP1A1 and CYP1A2 induction by beta-naphthoflavone.
Conclusions:
- CYP1A1 and CYP1A2 genes are regulated differently from other induced genes, despite sharing 5' enhancer regions.
- The distinct regulatory mechanisms highlight the complexity of gene induction by CYP1A1 inducers.