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Detection of malotilate toxicity in vitro with peripheral blood mononuclear cells as targets. A preliminary report
1First Department of Medicine, Chiba University School of Medicine, Japan.
Abstract:
An in vitro assessment of susceptibility to malotilate was made with peripheral blood mononuclear cells (PBMCs) as targets. PBMCs were incubated with malotilate in the presence or absence of the NADPH generating system and hepatic microsomes. Malotilate cytotoxicity to PBMCs, assessed by trypan blue dye exclusion and lactate dehydrogenase (LDH) release into the culture media, was found to be markedly increased by the addition of the NADPH generating system, indicating that metabolites play a significant role in toxicity. Once the significant role of malotilate metabolites in cytotoxicity was established, we applied this system to patients with suspected malotilate-induced liver injury. It was demonstrated that cytotoxicity was greater in PBMCs which were obtained from patients with chronic active hepatitis with a parallel malotilate-induced liver injury than in those from two different control groups; normal volunteers and patients with chronic active hepatitis who had had long-term malotilate treatment without any adverse reactions. This in vitro system seems to be of value in predicting potential malotilate toxicity in subjects who might be susceptible to this drug.
Insights
Malotilate toxicity in peripheral blood mononuclear cells (PBMCs) is driven by its metabolites. This in vitro method can predict susceptibility to malotilate-induced liver injury in patients.
Area of Science:
- Pharmacology
- Toxicology
- Immunology
Background:
- Malotilate is a drug used for liver conditions.
- Assessing drug-induced toxicity is crucial for patient safety.
- The role of malotilate metabolites in toxicity was previously unclear.
Purpose of the Study:
- To investigate the role of malotilate metabolites in drug-induced cytotoxicity.
- To develop an in vitro system for predicting malotilate toxicity.
- To assess the utility of this system in patients with suspected malotilate-induced liver injury.
Main Methods:
- Peripheral blood mononuclear cells (PBMCs) were used as target cells in vitro.
- PBMCs were incubated with malotilate, with and without a NADPH generating system and hepatic microsomes.
- Cytotoxicity was measured using trypan blue dye exclusion and lactate dehydrogenase (LDH) release.
- The system was applied to PBMCs from patients with suspected malotilate-induced liver injury and control groups.
Main Results:
- Malotilate-induced cytotoxicity to PBMCs was significantly enhanced by the addition of the NADPH generating system, indicating a role for metabolites.
- PBMCs from patients with chronic active hepatitis and malotilate-induced liver injury showed greater cytotoxicity compared to controls.
- Normal volunteers and patients with chronic active hepatitis on long-term malotilate without adverse effects served as controls.
Conclusions:
- Malotilate metabolites play a significant role in its cytotoxicity.
- An in vitro system using PBMCs can predict susceptibility to malotilate toxicity.
- This assay may be valuable for identifying individuals at risk for malotilate-induced liver injury.