Experiments on smooth muscles of rat stomach showed that lysophosphatidylcholine in concentrations of 10(-8) and 10(-7) g/ml does not modulate the tonotropic effect of acetylcholine (10(-6) g/ml), in a concentration of 10(-6) g/ml potentiated this effect (similarly to phosphatidylcholine, 10(-6) g/ml), and reduced it in concentrations of 10(-5)-10(-4) g/ml (similarly to hen egg yolk in dilutions of 1:500, 1:100, and 1:500). These data indicate that lysophosphatidylcholine modifies signal transduction from the receptor to G protein.
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