Add time:09/09/2019         Source:sciencedirect.com

Larval zebrafish (Danio rerio) have been suggested as a high-throughput experimental animal model for epilepsy-related genetic and developmental studies. The behavioral manifestations in response to the seizure-inducing drugs PICROTOXIN (cas 124-87-8) (PTX) (1, 5, 25, 125, or 625 μM) or pentylenetetrazole (PTZ) (1, 2, 4, 8, or 16 mM) under light-dark conditions were studied using zebrafish larvae at 5 days post-fertilization (dpf). Two behavioral parameters, locomotor activity and thigmotaxis behavior, were analyzed. We conclude that high concentrations of PTX treatment increased locomotion and thigmotaxis in 5 dpf zebrafish larvae under continuous illumination and the locomotion of PTX-treated zebrafish was decreased under the dark condition. High concentrations of PTX treatment also increased thigmotaxis (an indicator of increased anxiety levels) in zebrafish larvae under both continuous illumination and dark condition. PTZ treatment increased the locomotion of 5 dpf zebrafish larvae under continuous illumination. However, 2 mM PTZ decreased locomotion, and high concentrations of PTZ decreased the locomotion of larvae under dark conditions. High concentrations of PTZ treatment also increased thigmotaxis in the zebrafish larvae under both continuous illumination and dark condition. Compared with PTZ, PTX leads to higher levels of movement under light conditions and lower levels of movement under dark condition. However, the level of thigmotaxis in the zebrafish larvae was similar between the two drug treatments.

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