Inhibition of human neutrophil activation by the allergic mediator release inhibitor, CI-922: mechanism of inhibitory activity |
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Authors: | C D Wright M D Hoffman D O Thueson M C Conroy |
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Institution: | Pharmacology Department, Parke-Davis Pharmaceutical Research Division, Warner-Lambert Company, Ann Arbor, Michigan 48105. |
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Abstract: | 3,7-Dimethoxy-4-phenyl-N-1H tetrazol-5-yl-4H-furo3,2-b]-indole-2- carboxamide, L-arginate (CI-922) is a potent inhibitory of human neutrophil functions in response to a variety of stimuli. In this report, the effects of CI-922 on specific processes involved in stimulus-response coupling are evaluated. CI-922 does not inhibit human neutrophil phospholipase C or protein kinase C activities. CI-922 is shown to inhibit calmodulin-dependent enzyme activation. The calmodulin antagonist activity is confirmed by calmodulin-Sepharose affinity chromatography. These results suggest that CI-922 inhibits neutrophil activation by preventing the activation of calmodulin-dependent enzymes, implying a critical role for such enzymes in stimulus-response coupling. |
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