Dynamic organ culture of precision liver slices for in vitro toxicology
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Abstract:
The lack of a reproducible method for the production of thin tissue slices has hindered the use of liver slices as an in vitro tool for hepatotoxicity studies. Fresh human, rat, and rabbit liver was processed using a mechanical slicer. With this instrument, precision (5% of thickness) liver slices in the submillimeter range could be produced at a rapid rate. Slices were prepared from fresh livers in chilled, oxygenated buffer to minimize trauma. Following incubation for up to 20 h in a dynamic organ culture system, histology of incubated slices suggested that 250 m precision-cut slices were optimum in regard to morphology relative to liver slices incubated under conventional organ culture conditions. Addition of bromobenzene to the culture showed time-dependent hepatotoxicity based on two classic parameters of cell degeneration. Histological evidence is presented which suggests the usefulness of this system for hepatotoxicity studies and the production of focal necrosis in vitro.
Insights
A new mechanical slicer enables rapid production of precise liver slices for in vitro hepatotoxicity studies. This method preserves tissue morphology and demonstrates reproducible toxicity, aiding drug safety assessments.
Area of Science:
- Toxicology
- In Vitro Models
- Hepatology
Background:
- Reproducible liver slice production is crucial for in vitro hepatotoxicity testing.
- Existing methods limit the utility of liver slices in toxicological studies.
- Standardized liver slice preparation is needed for reliable drug safety evaluations.
Purpose of the Study:
- To develop and validate a reproducible method for producing precision liver slices.
- To assess the suitability of these slices for in vitro hepatotoxicity studies.
- To evaluate the morphological integrity and toxicological response of the prepared liver slices.
Main Methods:
- Utilized a mechanical slicer to process fresh human, rat, and rabbit liver.
- Prepared submillimeter precision liver slices (±5% thickness) in chilled, oxygenated buffer.
- Incubated slices for up to 20 hours in a dynamic organ culture system.
- Assessed morphology via histology and induced toxicity using bromobenzene.
Main Results:
- The mechanical slicer rapidly produced precision liver slices with minimal trauma.
- 250 µm precision-cut slices exhibited optimal morphology after 20-hour incubation.
- Bromobenzene exposure induced time-dependent hepatotoxicity, evidenced by cell degeneration and focal necrosis.
- Histological analysis confirmed the utility of the system for in vitro toxicity assessment.
Conclusions:
- A reproducible method for generating precision liver slices using a mechanical slicer was established.
- This technique supports reliable in vitro hepatotoxicity studies by maintaining tissue viability and morphology.
- The system effectively models in vitro focal necrosis, proving valuable for drug-induced liver injury research.