Ipconazole Disrupts Mitochondrial Homeostasis and Alters GABAergic Neuronal Development in Zebrafish

• Published in: International journal of molecular sciences 2022-12, Vol.24 (1), p.496
• Main Authors: Lee, Giyoung, Banik, Amit, Eum, Juneyong, Hwang, Byung Joon, Kwon, Seung-Hae, Kee, Yun
• Format: Article
• Language: English
• Subjects: Animals; Antioxidants - metabolism; Embryo, Nonmammalian - metabolism; ipconazole pesticide; Larva - metabolism; Mitochondria - metabolism; mitochondrial dysfunction; neurodevelopmental toxicity; Oxidative Stress; Pesticides - metabolism; Water Pollutants, Chemical - metabolism; zebrafish; Zebrafish - genetics
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms24010496

Ipconazole, a demethylation inhibitor of fungal ergosterol biosynthesis, is widely used in modern agriculture for foliar and seed treatment, and is authorized for use in livestock feed. Waste from ipconazole treatment enters rivers and groundwater through disposal and rain, posing potential toxicity to humans and other organisms. Its metabolites remain stable under standard hydrolysis conditions; however, their neurodevelopmental toxicity is unknown. We investigated the potential neurodevelopmental toxicity of ipconazole pesticides in zebrafish ( ). Our behavioral monitoring demonstrated that the locomotive activity of ipconazole-exposed zebrafish larvae was reduced during early development, even when morphological abnormalities were undetected. Molecular profiling demonstrated that the mitochondrial-specific antioxidants, superoxide dismutases 1 and 2, and the genes essential for mitochondrial genome maintenance and functions were specifically reduced in ipconazole-treated (0.02 μg/mL) embryos, suggesting underlying ipconazole-driven oxidative stress. Consistently, ipconazole treatment substantially reduced expression and increased ERK1/2 phosphorylation in a dose-dependent manner. Interrupted expression confirmed that GABAergic inhibitory neurons were dysregulated at 0.02 μg/mL ipconazole, whereas glutamatergic excitatory and dopaminergic neurons remained unaffected, resulting in an uncoordinated neural network. Additionally, ipconazole-treated (2 μg/mL) embryos exhibited caspase-independent cell death. This suggests that ipconazole has the potential to alter neurodevelopment by dysregulating mitochondrial homeostasis.