A role for protein kinase C in the production of free oxygen radicals in response to Nippostrongylus brasiliensis.
The involvement of protein kinase C in the initiation of free oxygen radical generation by rat leukocytes in response to the nematode Nippostrongylus brasiliensis was investigated. Inhibitors of protein kinase C, trifluoperazine and 1-(5-isoquinolinylsulfonyl)-2-methylpiperazine (H-7), inhibited free radical generation in response to N. brasiliensis in vitro. Neither inhibitor affected free radical generation by the cell-free xanthine/xanthine oxidase system, indicating that the agents did not scavenge free radicals; they also failed to affect leukocyte viability. Furthermore, activators of protein kinase C, the calcium ionophore A23187 and the diacylglycerol 1-oleoyl-2-acetyl-rac-glycerol (OAG), enhanced free radical generation by leukocytes in response to N. brasiliensis in vitro. Thus, protein kinase C apparently plays an important role in the initiation of free radical generation in response to N. brasiliensis; since free radicals may play a critical role in worm expulsion, this implies that protein kinase C may also be important in the rejection of N. brasiliensis from the small intestine of the rat.
Smith
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NC
Department of Zoology, Australian National University, Canberra A.C.T.
D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000818:Animals; D000001:Calcimycin / Q000494:pharmacology; D004075:Diglycerides / Q000494:pharmacology; D004789:Enzyme Activation; D005260:Female; D005609:Free Radicals; D007546:Isoquinolines / Q000494:pharmacology; D007962:Leukocytes / Q000276:immunology* / Q000378:metabolism; D009349:Nematode Infections / Q000276:immunology*; D009559:Nippostrongylus / Q000276:immunology*; D010100:Oxygen / Q000378:metabolism*; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D014268:Trifluoperazine / Q000494:pharmacology
D004075:Diglycerides; D005609:Free Radicals; D007546:Isoquinolines; D010879:Piperazines; D014268:Trifluoperazine; D000001:Calcimycin; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; C038237:1-oleoyl-2-acetylglycerol; D011493:Protein Kinase C; D010100:Oxygen