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[Effects of intestinal flora on the expression of cytochrome P450 3A in the liver].
- Source :
-
Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan [Yakugaku Zasshi] 2012; Vol. 132 (3), pp. 301-10. - Publication Year :
- 2012
-
Abstract
- Living organisms eliminate foreign low-antigenic substances, such as drugs and environmental pollutants, by detoxification mediated by metabolizing cytochrome P450 (CYP). We have examined the possible regulation of CYP expression by enteric bacteria. Cyp mRNA expression levels, Cyp3a protein expression level, and the activity of Cyp3a in hepatic microsomal fractions were compared in germ-free (GF) and specific pathogen-free (SPF) mice. We evaluated hepatic Cyp3a11 mRNA expression levels and Cyp3a metabolic activity in GF and SPF mice after five days of antibiotic administration. The fecal levels of lithocholic acid (LCA)-producing bacteria and hepatic taurolithocholic acid (TLCA) were also measured. Cyp mRNA expression levels, Cyp3a protein expression level, and the activity of Cyp3a in SPF mice were higher than those in GF mice, indicating that enteric bacteria increases hepatic Cyp3a expression. The effects of enteric bacteria-reducing antibiotics on Cyp3a expression were examined. We observed that decreasing enteric bacteria with antibiotics in SPF mice caused a significant decrease in the hepatic Cyp3a11 mRNA expression, TLCA, and fecal LCA-producing bacteria compared to the group that did not receive antibiotics. No change in Cyp3a11 expression was observed in GF mice that were treated with antibiotics. Administration of LCA to GF mice showed an increase in Cyp3a11 expression similar to that of SPF mice. The enzymes of the enteric bacteria are believed to metabolize and detoxify drugs by either reduction or hydrolysis. The results of this study indicate that changes in enteric bacteria may alter the expression and activity of hepatic drug metabolizing enzymes and pharmacokinetics. Therefore, enteric bacteria should be closely monitored to ensure the safe use of drugs.
- Subjects :
- Animals
Anti-Bacterial Agents
Cytochrome P-450 CYP3A genetics
Gene Expression Regulation, Enzymologic
Germ-Free Life
Intestinal Mucosa metabolism
Lithocholic Acid biosynthesis
Liver metabolism
Mice
RNA, Messenger metabolism
Taurolithocholic Acid metabolism
Bacteria metabolism
Bacterial Physiological Phenomena
Cytochrome P-450 CYP3A metabolism
Intestines microbiology
Liver enzymology
Subjects
Details
- Language :
- Japanese
- ISSN :
- 1347-5231
- Volume :
- 132
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan
- Publication Type :
- Academic Journal
- Accession number :
- 22382834
- Full Text :
- https://doi.org/10.1248/yakushi.132.301