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Journal of Pharmacology and Experimental Therapeutics

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Abstract

The anticonvulsant MK-801 interacts with peripheral and central nicotinic acetylcholine receptor ion channels.

A S Ramoa, M Alkondon, Y Aracava, J Irons, G G Lunt, S S Deshpande, S Wonnacott, R S Aronstam and E X Albuquerque
Journal of Pharmacology and Experimental Therapeutics July 1990, 254 (1) 71-82;
A S Ramoa
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M Alkondon
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Y Aracava
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J Irons
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G G Lunt
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S S Deshpande
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S Wonnacott
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R S Aronstam
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E X Albuquerque
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Abstract

The effects of MK-801 [( +]-5-methyl-10,11-dihydro-5H-di-benzo[a, d]cyclohepten-5,10-imine) on peripheral and central nicotinic receptors were studied using electrophysiological and biochemical techniques. MK-801 depressed the peak amplitude and accelerated the decay of end-plate currents. The drug (1-10 microM) decreased the frequency of activation of acetylcholine (ACh)-induced single-channel currents in addition to shortening the mean open and burst times of channels activated by either ACh or (+)anatoxin-a (AnTX). MK-801 (10-40 microM) depressed the single potentials and trains of ACh and AnTX-induced potentials in chronically denervated rat soleus muscles. MK-801 blocked the twitch responses (20-100 microM) of both frog sartorius and rat diaphragm muscles evoked by stimulation of their respective nerves. Also this drug (less than 1 microM) decreased the frequency of channels activated by AnTX or ACh in outside-out patch membranes of rat retinal ganglion cells with minimal changes in the channel open time. MK-801 (10-25 microM) depressed (-)nicotine-evoked gamma-amino[2,3-3H]butyric acid release from rat hippocampal synaptosomes; however, it failed to affect the binding of [3H](-)nicotine to brain membranes and also failed to interfere with the binding of [125I]alpha-bungarotoxin to either frog muscle or Torpedo membranes. On the other hand, MK-801 inhibited the binding of [3H]perhydrohistrionicotoxin to Torpedo membranes and such an effect was more pronounced in the presence of carbamylcholine. Neither AnTX nor any other nicotinic agonist increased the binding of [3H]MK-801 to the N-methyl-D-aspartate receptor ion channel complex. The actions of MK-801 were evident at concentrations comparable with those needed to block N-methyl-D-aspartate receptors. These results demonstrate the existence of at least three different types of nicotinic AChR, all of which were blocked noncompetitively by MK-801.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 254, Issue 1
1 Jul 1990
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Abstract

The anticonvulsant MK-801 interacts with peripheral and central nicotinic acetylcholine receptor ion channels.

A S Ramoa, M Alkondon, Y Aracava, J Irons, G G Lunt, S S Deshpande, S Wonnacott, R S Aronstam and E X Albuquerque
Journal of Pharmacology and Experimental Therapeutics July 1, 1990, 254 (1) 71-82;

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Abstract

The anticonvulsant MK-801 interacts with peripheral and central nicotinic acetylcholine receptor ion channels.

A S Ramoa, M Alkondon, Y Aracava, J Irons, G G Lunt, S S Deshpande, S Wonnacott, R S Aronstam and E X Albuquerque
Journal of Pharmacology and Experimental Therapeutics July 1, 1990, 254 (1) 71-82;
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