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Updated: Aug 12, 2026

Transcutaneous Assessment of Renal Function in Conscious Rodents
Published on: March 26, 2016
[Sisomicin pharmacokinetics in rat tissues in single and long-term administration]
Sisomicin accumulates more in rat kidney medullary layers with repeated doses, suggesting a stronger link between sisomicin nephrotoxicity and kidney cortical layer concentrations.
Area of Science:
- Pharmacology
- Toxicology
- Nephrology
Background:
- Sisomicin is an aminoglycoside antibiotic.
- Understanding sisomicin pharmacokinetics is crucial for assessing its efficacy and toxicity.
- Kidney accumulation is a known concern for aminoglycosides.
Purpose of the Study:
- To investigate the pharmacokinetics of sisomicin in rats after intramuscular administration.
- To determine sisomicin tissue distribution and accumulation over 30 days.
- To explore the relationship between sisomicin levels and potential nephrotoxicity.
Main Methods:
- Intramuscular administration of sisomicin to rats at 12.5 and 25 mg/kg daily for 30 days.
- Measurement of sisomicin concentrations in kidney cortical and medullary layers, blood serum, liver, lungs, and spleen.
- Analysis of sisomicin levels after single and repeated doses.
Main Results:
- Sisomicin levels were highest in the kidney cortex and lowest in the liver after single doses.
- Tissue antibiotic levels increased with dose and duration of administration.
- Repeated dosing led to stabilization or decrease in kidney cortical layer concentrations but continuous increase in the medullary layer.
Conclusions:
- Sisomicin accumulation differs between kidney cortical and medullary layers with repeated administration.
- The correlation between sisomicin nephrotoxicity and its level is more pronounced in the kidney cortical layer.
- Further studies are warranted to elucidate the precise mechanisms of sisomicin-induced nephrotoxicity.
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