The effect of complexes of lidocaine with zinc, copper and cobalt on histamine release from peritoneal rat mast cells induced by various secretagogues was investigated. The complexes of lidocaine with metal ions inhibited histamine release induced by compound 48/80 and ionophoreous antibiotics: A23187 and X537A. The ionic complex of lidocaine with zinc was found to be the most potent against 48/80--induced histamine release and exerted the significant inhibition in the concentration of 10(-5) M. The action of coordination complex of lidocaine with zinc was somewhat weaker. The significant inhibitory effect on 48/80-induced histamine release of the copper and cobalt lidocaine complexes was observed in concentration of 10(-4) M. Histamine release by ionophores A23187 and X537A was also affected by zinc lidocaine complexes. However, coordination complex had more potent action on histamine release than the ionic one.
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