Fluchloralin

Fluchloralin is a dinitroaniline herbicide that effectively controls annual grassy and broadleaf weeds by inhibiting tubulin synthesis and cell division. It exhibits cytotoxic and genotoxic properties, promoting apoptosis through mechanisms such as the activation of apoptosis signaling proteins, formation of DNA ladder patterns, and induction of cell shrinkage and nuclear fragmentation.

Fluchloralin exhibits dose and time-dependent cytotoxic effects in CHO and MEF cells at concentrations of 5-20 μg/mL over 24-72 hours. At 2.5-20.0 μg/mL for 4-12 hours, it induces statistically significant, time-dependent chromosomal aberrations in CHO cells. Additionally, Fluchloralin increases sister chromatid exchange levels in CHO cells at 1.0-20.0 μg/mL after 12 hours. In synchronized MEF cells, Fluchloralin impair DNA synthesis in a dose-dependent manner at 5-20 μg/mL over 30 hours, without affecting thymidine transport. Furthermore, after treatment with 5-20 μg/mL for 6 hours, there is a nearly 50% reduction in DNA synthesis in synchronized MEF cells 12 hours post-exposure, again without affecting thymidine transport. Finally, Fluchloralin prompts apoptosis in CHO cells at 5-20 μg/mL for 24-72 hours, evidenced by DNA laddering and characteristic nuclear changes.

Fluchloralin (0.5-2 mg/L; water immersion; 4 days) exhibits dose-dependent developmental toxicity in zebrafish embryos, which includes reduced survival rate (LC 50 = 2.004 mg/L), morphological defects, neurotoxicity, cardiotoxicity, liver damage, and increased brain cell apoptosis.