Exposure to cobalt nanoparticles (CoNPs) has been associated with neurodegenerative disorders, while the mitochondrial-associated mechanisms that mediate their neurotoxicity have yet to be fully characterized. In this study, we reported that CoNPs exposure reduced the survival and lifespan in the nematodes, Caenorhabditis elegans (C. elegans). Moreover, exposure to CoNPs aggravated the induction of paralysis and the aggregation of &#
x3b2;-amyloid (A&#
x3b2;). These effects were accompanied by reactive oxygen species (ROS) overproduction, ATP reduction as well as mitochondrial fragmentation. Dynamin-related protein 1 (
drp-1) activation and ensuing mitochondrial fragmentation have been shown to be associated with CoNPs-reduced survival. In order to address the role of mitochondrial damage and ROS production in CoNPs-induced A&#
x3b2; toxicity, the mitochondrial reactive oxygen species scavenger mitoquinone (Mito Q) was used. Our results showed that Mito Q pretreatment alleviated CoNPs-induced ROS generation, rescuing mitochondrial dysfunction, thereby lessening the CoNPs-induced A&#
x3b2; toxicity. Taken together, we show for the first time, that increasing of ROS and the upregulation of
drp-1 lead to CoNPs-induced A&#
x3b2; toxicity. Our novel findings provide in vivo evidence for the mechanisms of environmental toxicant-induced A&#
x3b2; toxicity, and can afford new modalities for the prevention and treatment of CoNPs-induced neurodegeneration.