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The use of intradermal carrageenan in calves to estimate the dose of oxindanac, a nonsteroidal anti-inflammatory drug

, : The use of intradermal carrageenan in calves to estimate the dose of oxindanac, a nonsteroidal anti-inflammatory drug. Canadian Journal of Veterinary Research 57(4): 215-222

A simple and humane model of inflammation, induced by the intradermal injection of 0.3 mL of sterile 2% carrageenan, was characterized in calves by measuring the volume of skin swelling plus histological analysis of skin biopsies. Carrageenan produced a biphasic increase in skin swelling, with an early edematous response followed by a more chronic cellular infiltrate. The swelling and sensitivity to pressure observed in the early response were suitable for testing the antiedematous and analgesic activity of a new nonsteroidal anti-inflammatory drug (NSAID), oxindanac. Pretreatment with intravenous oxindanac at doses from 0.5 to 8.0 mg/kg reduced the volume of swelling and this reached statistical significance (p lt 0.05) at 2 mg/kg. The ED-50, and ED-90 values for inhibition of the peak swelling volume (4 h) were estimated to be 1 mg/kg and 2 mg/kg, respectively. These compare with an ED-90 of 2.0 mg/kg for inhibition of serum TxB-2 production, an index of platelet cyclooxygenase activity. The dose of oxindanac required for antiedematous activity correlated, therefore, with maximal inhibition of serum TxB-2. The analgesic activity of oxindanac reached no clear maximum response, but statistically significant difference (p lt 0.05) from placebo was reached with doses of 2 mg/kg and above. It is concluded that intradermal carrageenan produced a simple, humane and useful model for dose estimation of a new NSAID in calves.

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