Competitive antagonism of insect GABA receptors by iminopyridazine derivatives of GABA |
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Authors: | Mohammad Mostafizur Rahman Yuki Akiyoshi Shogo Furutani Kazuhiko Matsuda Kenjiro Furuta Izumi Ikeda Yoshihisa Ozoe |
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Institution: | 1. Division of Bioscience and Biotechnology, United Graduate School of Agricultural Sciences, Tottori University, Tottori 680-8553, Japan;2. Department of Life Science and Biotechnology, Faculty of Life and Environmental Science, Shimane University, Matsue, Shimane 690-8504, Japan;3. Department of Applied Biological Chemistry, Faculty of Agriculture, Kinki University, 3327-204 Nakamachi, Nara 631-8505, Japan |
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Abstract: | A series of 4-(6-imino-3-aryl/heteroarylpyridazin-1-yl)butanoic acids were synthesized and examined for antagonism of GABA receptors from three insect species. When tested against small brown planthopper GABA receptors, the 3,4-methylenedioxyphenyl and the 2-naphthyl analogues showed complete inhibition of GABA-induced fluorescence changes at 100 μM in assays using a membrane potential probe. Against common cutworm GABA receptors, these analogues displayed approximately 86% and complete inhibition of GABA-induced fluorescence changes at 100 μM, respectively. The 4-biphenyl and 4-phenoxyphenyl analogues showed moderate inhibition at 10 μM in these receptors, although the inhibition at 100 μM was not complete. Against American cockroach GABA receptors, the 4-biphenyl analogue exhibited the greatest inhibition (approximately 92%) of GABA-induced currents, when tested at 500 μM using a patch-clamp technique. The second most active analogue was the 2-naphthyl analogue with approximately 85% inhibition. The 3-thienyl analogue demonstrated competitive inhibition of cockroach GABA receptors. Homology modeling and ligand docking studies predicted that hydrophobic 3-substituents could interact with an accessory binding site at the orthosteric binding site. |
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