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Determination of aminoglycosides in rat renal tissue by enzyme immunoassay
Abstract:
The enzyme-multiplied immunoassay technique for the determination of gentamicin or amikacin in serum was evaluated for use in rat renal tissue. After the addition of either gentamicin or amikacin to tissue homogenate, the assay of the supernatant showed a reduced recovery, depending on the amount of renal tissue present per milliliter of homogenate. The recovery was independent of the amount of aminoglycoside added. This reduction could be due to either protein binding or interference with the enzyme-multiplied immunoassay technique by substances released from the renal tissue. When the enzyme-multiplied immunoassay technique is used for aminoglycoside assay in renal tissue, care should be taken to minimize the amount of tissue present in the homogenate or to correct for the decreased recovery.
Insights
Evaluating gentamicin and amikacin levels in rat renal tissue using enzyme-multiplied immunoassay technique (EMIT) requires careful consideration. Reduced recovery in EMIT assays is linked to renal tissue concentration, not drug amount.
Area of Science:
- Pharmacology and Toxicology
- Biochemistry
- Analytical Chemistry
Background:
- Enzyme-multiplied immunoassay technique (EMIT) is a common method for quantifying drug concentrations.
- Accurate measurement of aminoglycoside antibiotics like gentamicin and amikacin in biological tissues is crucial for therapeutic drug monitoring and research.
- Previous studies have focused on serum analysis, with limited data on tissue homogenates.
Purpose of the Study:
- To evaluate the suitability of the EMIT for determining gentamicin and amikacin concentrations in rat renal tissue homogenates.
- To identify potential factors affecting assay accuracy in renal tissue samples.
Main Methods:
- Rat renal tissue was homogenized, and known concentrations of gentamicin or amikacin were added.
- The supernatant was analyzed using the EMIT.
- Recovery rates were assessed in relation to varying amounts of renal tissue and aminoglycoside concentrations.
Main Results:
- A significant reduction in aminoglycoside recovery was observed in the EMIT assay of renal tissue homogenates.
- This reduced recovery was dependent on the concentration of renal tissue per milliliter of homogenate.
- The observed reduction was independent of the specific amount of gentamicin or amikacin added to the samples.
Conclusions:
- The presence of renal tissue components interferes with the EMIT assay for gentamicin and amikacin.
- Potential interference mechanisms include protein binding or the release of inhibitory substances from the tissue.
- When using EMIT for aminoglycoside analysis in renal tissue, it is essential to minimize tissue concentration or adjust for decreased recovery.