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Teicoplanin metabolism in rats
L F Zerilli1, L Cavenaghi, A Bernareggi
1Merrell Dow Research Institute, Lepetit Research Center, Gerenzano VA, Italy.
Antimicrobial Agents and Chemotherapy
|October 1, 1989
Summary
Teicoplanin shows minimal metabolic transformation in rats, with less than 5% undergoing changes. Most of the antibiotic is excreted unchanged in urine, with some adsorption to sediment affecting activity measurements.
Area of Science:
- Pharmacology
- Drug Metabolism
- Toxicology
Background:
- Teicoplanin is a key glycopeptide antibiotic used to treat serious Gram-positive bacterial infections.
- Understanding the metabolic fate of antibiotics is crucial for optimizing dosing and predicting potential drug interactions.
Purpose of the Study:
- To investigate the extent of metabolic transformation of teicoplanin in vivo.
- To quantify the recovery of radioactivity and microbiological activity in rat urine after intravenous administration.
Main Methods:
- Sprague-Dawley rats received intravenous [14C]teicoplanin.
- Urine samples were collected over 24 hours and analyzed for radioactivity and microbiological activity.
- High-performance liquid chromatography (HPLC) with UV and radioactivity detection was used to identify potential metabolites.
Main Results:
- 73.2% of administered radioactivity and 59.1% of microbiological activity were recovered in 24-h urine.
- The discrepancy in recovery was attributed to teicoplanin adsorption to urinary sediment.
- HPLC analysis indicated that only 3-5% of [14C]teicoplanin underwent metabolic or chemical transformation.
Conclusions:
- Teicoplanin undergoes minimal metabolic transformation in rats.
- The primary route of excretion is via urine, with minimal biotransformation.
- Adsorption to urinary sediment can impact the microbiological assessment of excreted antibiotic activity.