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Publication Type : Journal Article
Publisher : Cent Nerv Syst Agents Med Chem
Source : Cent Nerv Syst Agents Med Chem (2015)
Campus : Kochi
School : School of Pharmacy
Department : Pharmaceutical Chemistry & Analysis
Year : 2015
BACKGROUND: Hydrazone core is a versatile structural linker for the development of various classes of antiepileptic agents. The aim of this study was to investigate the anticonvulsant activity of thiophene based hydrazones according to the antiepileptic drug development program protocol.
METHODS: The maximal electroshock-induced seizure and 6 Hz "Psychomotor" seizure test models in mice were performed. Additionally, the active compounds in the screening test were subsequently subjected to the maximal electroshock-induced seizure test that allowed determination of their median effective doses and median toxic doses. The most active compound was also subjected to the In vitro Hippocampal slice culture neuroprotection assay.
RESULTS: Among the synthesized compounds, 1-(thiophen-2-yl) ethylidene] hydrazine carboxamides (THb) and 1-(thiophen-2-yl) ethylidene] hydrazine carbothioamide (THc) showed a broad-spectrum anticonvulsant activity since they were active in both maximal electroshock-induced seizure and 6Hz-Psychomotor induced seizure models with no neurotoxicity. In the mice maximal electroshock-induced seizure screen, compound THb gave an ED50 of 11.8 mg/kg and a TD50 of 39.47 mg/kg, resulting in a good protection index (PI), that is, TD50/ED50, of 3.3 when compared to Phenobarbital and Valproate. THb (100μM) was also found to be effectively suppressing network hyperexcitability in the in vitro mEC-HC spontaneous bursting model, as determined by effects on spontaneous burst activity and duration.
CONCLUSION: The suggested pharmacophore model for lead compounds from thiophene based hydrazones is explained by the hydrophobic domain-thiophene, electron donor-imine and hydrogen bonding domain-carboxamide or carbothioamide unit.
Cite this Research Publication : Bijo Mathew, Mathew, G. E., Suresh, J., Jaseel, M., Usman, D., Subramanyan, P. N. Shiva, Safna, K. F., and Vilapurathu, J. K., “Psychomotor Seizure Screening and in vitro Neuroprotection Assay of Hydrazones Derived from 2-Acetyl Thiophene.”, Cent Nerv Syst Agents Med Chem, 2015.