Integrating Distribution Kinetics and Toxicodynamics to Assess Repeat Dose Neurotoxicity Using Human BrainSpheres: a Case Study on Amiodarone

Overview

Journal Front Pharmacol

Date 2023 Sep 25

PMID 37745076

Authors

Carolina Nunes

Susana Proenca

Giovanna Ambrosini

David Pamies

Aurelien Thomas

Nynke I Kramer

Marie-Gabrielle Zurich

Affiliations

Soon will be listed here.

Abstract

For ethical, economical, and scientific reasons, animal experimentation, used to evaluate the potential neurotoxicity of chemicals before their release in the market, needs to be replaced by new approach methodologies. To illustrate the use of new approach methodologies, the human induced pluripotent stem cell-derived 3D model BrainSpheres was acutely (48 h) or repeatedly (7 days) exposed to amiodarone (0.625-15 µM), a lipophilic antiarrhythmic drug reported to have deleterious effects on the nervous system. Neurotoxicity was assessed using transcriptomics, the immunohistochemistry of cell type-specific markers, and real-time reverse transcription-polymerase chain reaction for various genes involved in the lipid metabolism. By integrating distribution kinetics modeling with neurotoxicity readouts, we show that the observed time- and concentration-dependent increase in the neurotoxic effects of amiodarone is driven by the cellular accumulation of amiodarone after repeated dosing. The development of a compartmental distribution kinetics model allowed us to predict the change in cell-associated concentrations in BrainSpheres with time and for different exposure scenarios. The results suggest that human cells are intrinsically more sensitive to amiodarone than rodent cells. Amiodarone-induced regulation of lipid metabolism genes was observed in brain cells for the first time. Astrocytes appeared to be the most sensitive human brain cell type . In conclusion, assessing readouts at different molecular levels after the repeat dosing of human induced pluripotent stem cell-derived BrainSpheres in combination with the compartmental modeling of kinetics provides a mechanistic means to assess neurotoxicity pathways and refine chemical safety assessment for humans.

Citing Articles

Novel Strategy to Assess the Neurotoxicity of Organic Solvents Such as Glycol Ethers: Protocol for Combining In Vitro and In Silico Methods With Human-Controlled Exposure Experiments.

Hopf N, Suter-Dick L, Huwyler J, Borgatta M, Hegg L, Pamies D JMIR Res Protoc. 2024; 13:e50300.

PMID: 38236630 PMC: 10835597. DOI: 10.2196/50300.

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