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Suppression of Platelet Aggregation by Bordetella pertussis Adenylate Cyclase Toxin

By Masaaki Iwaki, Kazunari Kamachi, Nikolaus Heveker and Toshifumi Konda


The effect of Bordetella pertussis adenylate cyclase toxin (ACT) on platelet aggregation was investigated. This cell-invasive adenylate cyclase completely suppressed ADP (10 μM)-induced aggregation of rabbit platelets at 3 μg/ml and strongly suppressed thrombin (0.2 U/ml)-induced aggregation at 10 μg/ml. The suppression was accompanied by marked increase in platelet intracellular cyclic AMP (cAMP) content and was diminished by the anti-ACT monoclonal antibody B7E11. A catalytically inactive point mutant of ACT did not show the suppressive effect. Since an increase of cAMP content is a known cause of platelet dysfunction, these results indicate that the observed platelet inactivation was due to the catalytic activity of ACT through increase of intracellular cAMP

Topics: Molecular and Cellular Pathogenesis
Publisher: American Society for Microbiology
Year: 1999
OAI identifier:
Provided by: PubMed Central
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