title: The effect of carbaryl on the arachidonic acid metabolism and superoxide production by mouse resident peritoneal macrophages challenged by zymosan.
abstract: Carbaryl, a broad spectrum insecticide with anticholinesterase activity, was tested for its ability to disturb resident peritoneal macrophages stimulated by opsonized zymosan. The effect of carbaryl on superoxide production and on the release of [1-14C] arachidonic acid and 14C-labelled prostaglandins was dose-dependent. For 2.5 X 10(-6) M of carbaryl, superoxide production and prostaglandin release were not significantly inhibited. At 12.5 X 10(-6) M, the inhibitory effect was apparent for superoxide production (33%) and for the release of 6 KPGF1 alpha (60%), PGE2 (42%), PGF2 alpha (38%), PGD2 (33%). Carbaryl had no effect on the level of free arachidonic acid. Insecticide at 12.5 X 10(-6) M significantly decreased the deacylation of the phosphatidylcholine (20%). Incubation of resident peritoneal macrophages with indomethacin studied conjointly decreased only the prostaglandin release. These results suggest that carbaryl decreases the sequence of events following the binding of a particulate agent to its receptor and leading to the induction of phospholipase activity and the subsequent release of 20:4 and the oxidative burst in the cells. The effect of this pesticide on phospholipid metabolism and its consequences on macrophage stimulation are discussed. Ecto-serine esterase inhibition in the effect mechanism of the pesticide was suggested.
mesh_terms: D000818:Animals; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000378:metabolism*; D012721:Carbaryl / Q000494:pharmacology*; D066298:In Vitro Techniques; D007213:Indomethacin / Q000494:pharmacology; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008264:Macrophages / Q000187:drug effects* / Q000276:immunology / Q000378:metabolism; D008297:Male; D008563:Membrane Lipids / Q000378:metabolism; D051379:Mice; D013481:Superoxides / Q000378:metabolism*; D015054:Zymosan / Q000494:pharmacology
chemical_list: D001095:Arachidonic Acids; D008563:Membrane Lipids; D013481:Superoxides; D016718:Arachidonic Acid; D015054:Zymosan; D007770:L-Lactate Dehydrogenase; D012721:Carbaryl; D007213:Indomethacin