title: A C5a inhibitor in peritoneal fluid.
abstract: Peritoneal fluid was found to contain an inhibitor of neutrophil chemotaxis. The inhibitor was effective only against the chemotactic activity of zymosan-activated serum (including purified C5a) and had no effect when f-met-leu-phe served as chemoattractant. Inhibition was not the result of a direct effect on the neutrophils, since incubation of cells with the peritoneal fluid did not alter their chemotactic response. The inhibitor was found to be a protein with a molecular weight of approximately 40,000 dalton by gel filtration. It resembles the inhibitor previously described by us in synovial fluids, and thus it is proposed to play a role in the regulation of inflammation in serosal tissues.
mesh_terms: D001202:Ascitic Fluid; D002633:Chemotaxis / Q000187:drug effects; D002850:Chromatography, Gel; D003182:Complement C5 / Q000037:antagonists & inhibitors*; D015936:Complement C5a; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology*; D009504:Neutrophils / Q000187:drug effects
chemical_list: D003182:Complement C5; D009240:N-Formylmethionine Leucyl-Phenylalanine; D015936:Complement C5a