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Uncoupling as initiating event in mitochondrial dysfunction after diuron exposure.

Danielle Gabriel Seloto^1,2, Thania Rios Rossi Lima^1,2, João Lauro Vianna de Camargo^1,2

¹Medical School, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil.

Drug and Chemical Toxicology

|September 19, 2024

Summary

This summary is machine-generated.

Diuron herbicide causes cell damage and tumors. This study shows Diuron and its metabolites are mitotoxic, damaging mitochondria in liver cells, potentially explaining its carcinogenicity.

Keywords:

DCA DCPMU Diuron Mitochondrial damage mitotoxicants toxicity mechanisms

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Area of Science:

Toxicology
Mitochondrial Biology
Carcinogenesis

Background:

Diuron, a urea-based herbicide, is classified as a likely human carcinogen by the USEPA due to its ability to induce urinary bladder tumors in rodents.
Previous studies indicate Diuron's cytotoxic effects on the urothelium, leading to necrosis, hyperplasia, and tumor development.
The proposed mechanism involves mitotoxicity, where Diuron and its metabolites damage mitochondria.

Purpose of the Study:

To investigate the mitotoxic potential of Diuron and its metabolites, 3-(3,4-diclorofenil)-1-metilureia (DCPMU) and 3,4-dichloroaniline (DCA).
To evaluate the effects of these compounds on mitochondria isolated from rat liver, the primary site of Diuron metabolism.

Main Methods:

In vitro exposure of isolated rat liver mitochondria to Diuron, DCPMU, and DCA at concentrations from 0.5 to 500 µM.
Assessment of mitochondrial function, including oxidative phosphorylation, membrane potential, and oxygen consumption.
Morphological evaluation of mitochondria for signs of damage, such as swelling.

Main Results:

Diuron, DCPMU, and DCA at 100 and 500 µM concentrations uncoupled oxidative phosphorylation.
Mitochondrial membrane potential dissipated and basal oxygen consumption decreased.
At 500 µM, DCA induced significant mitochondrial swelling, indicating severe organelle damage.

Conclusions:

Diuron and its metabolites, DCA and DCPMU, exhibit mitotoxicity towards liver cells.
The observed mitochondrial dysfunction provides evidence for Diuron's carcinogenic mode of action.
These findings support the classification of Diuron as a mitotoxic agent contributing to its carcinogenicity.