Developmental hepatotoxicity induced by flusilazole in zebrafish: Mechanistic insights into mitochondrial dysfunction, oxidative stress, ferroptosis, and regenerative impairment

Flusilazole is a triazole-based fungicide that persists in various environments because of its high stability and solubility, raising concerns about its developmental and ecological impacts. Although numerous studies have reported flusilazole-induced toxicity, the specific effects and mechanisms of flusilazole-induced hepatotoxicity during development remain unclear. In this study, we examined the in vivo and in vitro toxicities in Danio rerio (zebrafish) and zebrafish-derived liver (ZFL) cells. Morphological changes in the liver and alterations in liver regeneration were evaluated using fabp10a:dsRed and fabp10a:CFP-NTR transgenic models. Flusilazole exposure was shown to deteriorate hepatic structure and regenerative capacity, with potential long-term consequences for aquatic organisms. Moreover, in ZFL cells, flusilazole treatment induced oxidative stress, mitochondrial malfunction, and disruption of calcium and iron homeostasis, leading to the induction of apoptosis and ferroptosis. Transcriptomic analysis supported these findings. Additionally, disturbances in ERK and Akt signaling indicated interference with pathways central to cell survival, growth, and tissue repair. Together, these findings establish that flusilazole exerts developmental hepatotoxic effects and highlight its potential hazards to ecosystems.