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Quantitative Polymerase Chain Reaction-based Analyses of Murine Intestinal Microbiota After Oral Antibiotic Treatment
08:33

Quantitative Polymerase Chain Reaction-based Analyses of Murine Intestinal Microbiota After Oral Antibiotic Treatment

Published on: November 17, 2018

Antibiotics suppress Cyp3a in the mouse liver by reducing lithocholic acid-producing intestinal flora

Takahiro Toda1, Kanna Ohi, Toshiyuki Kudo

  • 1Department of Clinical Pharmacokinetics, Hoshi University, Tokyo, Japan.

Yakugaku Zasshi : Journal of the Pharmaceutical Society of Japan
|May 8, 2009
PubMed

Insights

Antibiotic use can reduce liver lithocholic acid (LCA) by altering gut bacteria, leading to decreased Cyp3a expression. This suggests antibiotics may impact drug metabolism and individual pharmacokinetic differences.

Area of Science:

  • Pharmacology
  • Microbiology
  • Drug Metabolism

Background:

  • Cyp3a enzymes are crucial for drug metabolism in the liver.
  • Intestinal bacteria produce lithocholic acid (LCA), which influences hepatic Cyp3a levels.
  • Previous studies showed ciprofloxacin (CPX) reduces hepatic LCA and Cyp3a expression.

Purpose of the Study:

  • To investigate if other antibiotics targeting LCA-producing bacteria also decrease hepatic LCA levels.
  • To determine if this leads to reduced Cyp3a11 expression.
  • To explore the impact of gut microbiota alterations on drug metabolism.

Main Methods:

  • Administered various antibiotics (ampicillin, CPX, levofloxacin, vancomycin/imipenem) to specific-pathogen-free (SPF) and germ-free (GF) mice.
  • Measured Cyp3a11 mRNA expression in the liver.
  • Quantified LCA-producing bacteria in feces and hepatic taurine-conjugated LCA levels.

Main Results:

  • Antibiotic administration significantly reduced Cyp3a11 mRNA expression in SPF mice but not in GF mice.
  • LCA-producing bacteria and hepatic taurine-conjugated LCA levels decreased in antibiotic-treated SPF mice.
  • These changes correlated with reduced Cyp3a11 expression, indicating a role for gut microbiota.

Conclusions:

  • Antibiotics active against LCA-producing bacteria reduce hepatic LCA levels by altering gut microbiota.
  • This reduction in LCA is linked to decreased Cyp3a11 expression in mice.
  • Findings suggest potential impacts on human CYP3A4 expression and drug pharmacokinetics, highlighting the role of gut flora in drug response variability.

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