Effects of non‐steroidal anti‐inflammatory drugs on canine neutrophil chemotaxis

Strom, H. & Krogsgaard Thomsen, M. Effects of non-steroidal anti-inflammatory drugs on canine neutrophil chemotaxis. J. vet. Pharmacol. Therap. 13, 186–191. Non-steroidal anti-inflammatory drugs exhibit differences in their ability to suppress polymorphonuclear leucocyte (PMN) functions in different species. The present study investigated the in-vitro and ex-vivo effects of phenylbutazone and flunixin on leukotriene-B4-directed migration of canine PMN. Furthermore, in-vitro comparison was made to indomethacin and the 5-lipoxygenase inhibitor, nordihydroguaiaretic acid (NDGA). In vitro, flunixin and NDGA were the most potent inhibitors, with IC50s of 13 and 7 μmol/l, respectively. Phenylbutazone had an IC50 of 42 μmol/l whereas indomethacin did not achieve 50% inhibition at concentrations less than 100 μmol/l. Ex vivo, flunixin almost completely abolished the LTB4 response at 1h, and still possessed significant inhibitory activity 24 h after a dosage of 1mg/kg i.v. Phenylbutazone was less active ex vivo but did suppress chemotaxis by 23% (P<0.05) at 1h following an i.v. dose of 20mg/kg. It is suggested that part of the anti-inflammatory action of flunixin in dogs may be attributed to inhibition of PMN recruitment. M. Krogsgaard Thomsen, Department of Pharmacology, Leo Pharmaceutical Products, DK-2750, Ballerup, Denmark.