Abstract
A homologous set of low-molecular weight compounds selectively blocking ionic currents were purified from venom from the spiderArgiope lobata with a selective blocking action on ionic currents activated by applying glutamate and its agonist kainic acid (KA) to the membrane of neurons isolated from the rat hippocampus. Three groups of these compounds — argiopine, argiopinines, and pseudoargiopinines, produced voltage-dependent glutamate- and KA-activated ionic currents at concentrations of 10−6-10−4 M, interacting primarily with agonist-activated ionic channels without affecting Kd values of the agonist. The blocking action could be partially reversed by argiopine application but only slightly when argiopinines and pseudoargiopinines were used. Kinetics of toxin effects on Ka-activated ionic currents showed at least two exponential components with different time constants. Simple and reversed rate constants of interaction between toxins and ionic channels were estimated from the plot of the kinetics of ionic current blockade and recovery against toxin concentration. Argiopine, argiopinines, and pseudoargiopinines lend themselves to further research into glutamate receptors of the mammalian CNS employing electrophysiological and biochemical techniques.
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A. A. Bogomolets Institute of Physiology, Academy of Sciences of the Ukrainian SSR, Kiev, M. M. Shemyakin Institute of Bioorganic Chemistry, Academy of Sciences of the USSR, Moscow. Translated from Neirofiziologiya, Vol. 21, No. 6, pp. 748–756, November–December, 1989.
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Kiskin, N.I., Kryshtal', O.A., Tsyndrenko, A.Y. et al. Argiopine, argiopinines, and pseudoargiopinines as glutamate receptor blockers in hippocampal neurons. Neurophysiology 21, 525–532 (1989). https://doi.org/10.1007/BF01051949
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DOI: https://doi.org/10.1007/BF01051949