Diflubenzuron Induces Cardiotoxicity in Zebrafish Embryos

Area of Science:

• Environmental Toxicology
• Aquatic Toxicology
• Insecticide Ecotoxicology

Background:

• Diflubenzuron is a chitin inhibitor insecticide used against various larvae.
• Diflubenzuron residues are found in aquaculture, but its aquatic toxicity is not well understood.
• Zebrafish embryos are a sensitive model for assessing developmental toxicity.

Purpose of the Study:

• To investigate the cardiotoxicity of diflubenzuron in zebrafish embryos.
• To elucidate the mechanisms underlying diflubenzuron-induced cardiac damage.
• To assess the impact of diflubenzuron on zebrafish embryo development and survival.

Main Methods:

• Zebrafish embryos were exposed to varying concentrations of diflubenzuron (0-4.5 mg/L).
• Morphological changes, mortality, hatchability, and heart rate were assessed.
• Oxidative stress markers (ROS, MDA), antioxidant enzyme activity (SOD, CAT), apoptosis (AO staining), and gene expression (Q-PCR) were analyzed.

Main Results:

• Diflubenzuron exposure led to increased venous sinus-bulbar artery distance, inhibited myocardial cell proliferation, and impaired vascular development.
• Increased reactive oxygen species and malondialdehyde levels, alongside inhibited antioxidant enzyme activity, were observed.
• Diflubenzuron induced apoptosis in cardiac cells and altered the expression of apoptosis-related and heart-related genes.

Conclusions:

• Diflubenzuron exposure induces significant cardiotoxicity in zebrafish embryos.
• Oxidative stress and apoptosis are key mechanisms mediating diflubenzuron-induced cardiac damage.
• Findings contribute to understanding the ecological safety of diflubenzuron in aquatic environments.