Quantitative analysis of the effect of probenecid on pharmacokinetics of 99mTc-mercaptoacetyltriglycine in dogs.

Abstract

Effect of probenecid on pharmacokinetics of 99mTc-mercaptoacetylytriglycine (99mTc-MAG3) in dogs was investigated before (control), and after 15 min and 24 h of i.v. injection of probenecid (20 mg/kg). Plasma concentration-time profiles of 99mTc-MAG3 were described with a two-compartment open model. Plasma 99mTc-MAG3 clearances (Clp, ml/min/kg) were 7.9 +/- 0.5, 3.3 +/- 0.5 and 4.8 +/- 1.3 in control, 15 min and 24 h after probenecid administration respectively. Similarly, the biological half-lives at elimination phase (t(1/2), h) were 0.61 +/- 0.09, 0.79 +/- 0.11 and 0.74 +/- 0.12, and volumes of distribution at steady state (Vdss, L/kg) were 0.29 +/- 0.04, 0.20 +/- 0.05 and 0.25 +/- 0.06 respectively. The prolonged biological half-life and decreased Vdss decreased Clp significantly. Clp was a function of plasma probenecid concentration based on Michaelis-Menten kinetics. The maximum Clp inhibition (Imax) by probenecid and the plasma probenecid concentration that induced 50% of Imax (I50) were estimated to be 72 +/- 12% and 13 +/- 8 microg/ml respectively. This means that the rest (about 28%) of the Clp is not blocked by probenecid alone, suggesting the possibility of another route(s) of elimination or renal transporters which are independent from probenecid. Moreover, inter-species correlation between Clp of 99mTc-MAG3 and body weight are discussed.

• Authors: T Kakizaki, Y Yokoyama, M Natsuhori, N Yamada, M Hashimoto, K Sato, N Ito, G B Daniel
• Journal: Journal of veterinary pharmacology and therapeutics (J Vet Pharmacol Ther) Vol. 28 Issue 6 Pg. 559-64 (Dec 2005) ISSN: 0140-7783 [Print] England
• PMID: 16343289 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Radiopharmaceuticals
• Uricosuric Agents
• Technetium Tc 99m Mertiatide
• Probenecid

Topics

• Animals
• Area Under Curve
• Dogs (metabolism)
• Female
• Injections, Intravenous (veterinary)
• Kidney Function Tests (veterinary)
• Male
• Probenecid (administration & dosage, pharmacology)
• Radiopharmaceuticals (blood, pharmacokinetics)
• Technetium Tc 99m Mertiatide (blood, pharmacokinetics)
• Uricosuric Agents (administration & dosage, pharmacology)