Complexos derivados do ácido valproico - teratogenicidade embrionária e atividade anticonvulsivante em Zebrafish (Danio rerio)

Abstract

The most important determinant of quality of life in patients with epilepsy is complete seizure control, and therefore this should be the ultimate goal of pharmacological therapy. Unfortunately, around 30% of epileptic patients still suffer with refractory epilepsy. Metal ions have been frequently incorporated into pharmaceuticals for therapeutic or diagnostic purposes and the research. In this study, we access the embryo toxicity and anticonvulsant activity of 4 novel metallodrugs, with Zn+2 and Cu+2, derivative with valproic acid and the N-donor ligand in adult zebrafish pentylenetetrazole epileptic seizure model. [Cu(Valp)2Bipy] LC50 in 48 Hours Post Fertilization (hpf) was 0.22 μM and 0.12 μM in 96 hpf followed by [Zn(Valp)2Bipy] (LC50 = 10 μM). This same metallodrugs ([CuValp)2Bipi] 10 mM/Kg and [Zn(Valp)2Bipi] 30 mM and 100 mM/Kg) displayed a superior activity reducing the seizure intensity compared to Sodium Valproate (175 mM/Kg). As conclusion, among all, the [Cu(Valp)2Bipi] showed the best anticonvulsant effects, but due to its toxic effects on embryos and larvae, the [Zn(Valp)2Bipi] should be considered the most promising for future studies as anticonvulsant drug.