Effect of aminobenzotriazole (ABT) and/or 1,3-PBIT on the indomethacin (INDO)-induced changes in serum nitrite levels (A), renal nitrite production (B) and renal inducible nitric oxide synthase (iNOS) protein expression (C) 4 h after saline (vehicle) or endotoxin (ET) injection in conscious rats. Values are expressed as means±S.E.M. from 3-9 rats per treatment group. *ET vs. vehicle (p<0.05). ■INDO vs. vehicle (p<0.05). +ET+INDO vs. ET (p<0.05). ◆ET+INDO+1,3-PBIT vs. ET+INDO (p<0.05). ▲ET+INDO+1,3-PBIT+ABT vs. ET+INDO+1,3-PBIT (p<0.05).