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Start Over Author "Miragliotta G." Journal experientia
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2. Platelet aggregation and stimulation of leucocyte procoagulant activity by rickettsial lipopolysaccharides in rabbits and in man

Author

Nicola Semeraro, Donato Fumarola, Mario Colucci, and Miragliotta G

Subjects
Lipopolysaccharides, Platelet Aggregation, Platelet aggregation, Lipopolysaccharide, Stimulation, Thromboplastin, Microbiology, Cellular and Molecular Neuroscience, chemistry.chemical_compound, Tissue factor, Coxiella, Escherichia coli, Leukocytes, Animals, Humans, Platelet, Rickettsia, Rickettsia typhi, Molecular Biology, Pharmacology, biology, Cell Biology, biology.organism_classification, In vitro, Coagulation, chemistry, Molecular Medicine, lipids (amino acids, peptides, and proteins), Rabbits, Bacteria
Abstract

The effects in vitro of 4 purified lipopolysaccharide (LPS) preparations from Rickettsiae on platelets and leucocytes were studied in rabbits and in man. All LPS induced aggregation in rabbit platelet-rich plasma but to differing degrees. This activity was abolished by inactivation of complement. None of the preparations induced aggregation of human platelets. Both rabbit and human leucocytes, when incubated with each of the rickettsial LPS preparations, generated a potent procoagulant activity (tissue factor). These findings add further support to the concept that rickettsial LPS behave as typical LPS from gram-negative bacteria and may be relevant to the understanding of the mechanism(s) responsible for triggering intravascular coagulation in rickettsial diseases.

Published
1981

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