Differential inhibition of cyclooxygenase isoenzymes in the cat by the NSAID robenacoxib

Robenacoxib is a new nonsteroidal anti-inflammatory drug (NSAID) developed for use in companion animal medicine. The objectives of this study were: to quantify the inhibitory actions of robenacoxib on cyclooxygenase (COX) isoenzymes in feline whole blood assays; to establish blood concentration-time...

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Veröffentlicht in:Journal of veterinary pharmacology and therapeutics 2009-02, Vol.32 (1), p.31-40
Hauptverfasser: GIRAUDEL, J.M, TOUTAIN, P.-L, KING, J.N, LEES, P
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creator GIRAUDEL, J.M
TOUTAIN, P.-L
KING, J.N
LEES, P
description Robenacoxib is a new nonsteroidal anti-inflammatory drug (NSAID) developed for use in companion animal medicine. The objectives of this study were: to quantify the inhibitory actions of robenacoxib on cyclooxygenase (COX) isoenzymes in feline whole blood assays; to establish blood concentration-time profiles of robenacoxib after intravenous and subcutaneous dosing in the cat and; to predict the time courses of inhibition of COX isoforms by robenacoxib. COX-1 and COX-2 activities in heparinized feline whole blood samples were induced with calcium ionophore and lipopolysaccharide, respectively. Inhibition of thromboxane B₂ provided a marker of both COX-1 and COX-2 activities and a nonlinear parametric mixed effects modelling approach was used to establish the pharmacodynamic parameters describing this inhibition. Mean values (and prediction intervals) of IC₅₀ were 28.9 (16.4-51.1) μ m (COX-1) and 0.058 (0.010-0.340) μ m (COX-2). These parameters were used to compute several selectivity indices. Selectivity IC ratios (COX-1:COX-2) were 502.3 (IC₅₀/IC₅₀), 451.6 (IC₉₅/IC₉₅) and 17.05 (IC₂₀/IC₈₀). Based on a clinically recommended dosage regimen of 2 mg/kg, it was predicted that the corresponding mean robenacoxib blood concentration over the first 12 h after drug administration corresponded to 5% inhibition of COX-1 and 90% inhibition of COX-2.
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The objectives of this study were: to quantify the inhibitory actions of robenacoxib on cyclooxygenase (COX) isoenzymes in feline whole blood assays; to establish blood concentration-time profiles of robenacoxib after intravenous and subcutaneous dosing in the cat and; to predict the time courses of inhibition of COX isoforms by robenacoxib. COX-1 and COX-2 activities in heparinized feline whole blood samples were induced with calcium ionophore and lipopolysaccharide, respectively. Inhibition of thromboxane B₂ provided a marker of both COX-1 and COX-2 activities and a nonlinear parametric mixed effects modelling approach was used to establish the pharmacodynamic parameters describing this inhibition. Mean values (and prediction intervals) of IC₅₀ were 28.9 (16.4-51.1) μ m (COX-1) and 0.058 (0.010-0.340) μ m (COX-2). These parameters were used to compute several selectivity indices. Selectivity IC ratios (COX-1:COX-2) were 502.3 (IC₅₀/IC₅₀), 451.6 (IC₉₅/IC₉₅) and 17.05 (IC₂₀/IC₈₀). 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The objectives of this study were: to quantify the inhibitory actions of robenacoxib on cyclooxygenase (COX) isoenzymes in feline whole blood assays; to establish blood concentration-time profiles of robenacoxib after intravenous and subcutaneous dosing in the cat and; to predict the time courses of inhibition of COX isoforms by robenacoxib. COX-1 and COX-2 activities in heparinized feline whole blood samples were induced with calcium ionophore and lipopolysaccharide, respectively. Inhibition of thromboxane B₂ provided a marker of both COX-1 and COX-2 activities and a nonlinear parametric mixed effects modelling approach was used to establish the pharmacodynamic parameters describing this inhibition. Mean values (and prediction intervals) of IC₅₀ were 28.9 (16.4-51.1) μ m (COX-1) and 0.058 (0.010-0.340) μ m (COX-2). These parameters were used to compute several selectivity indices. Selectivity IC ratios (COX-1:COX-2) were 502.3 (IC₅₀/IC₅₀), 451.6 (IC₉₅/IC₉₅) and 17.05 (IC₂₀/IC₈₀). 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dosage</subject><subject>Cyclooxygenase Inhibitors - blood</subject><subject>Cyclooxygenase Inhibitors - pharmacokinetics</subject><subject>Cyclooxygenase Inhibitors - pharmacology</subject><subject>Dose-Response Relationship, Drug</subject><subject>enzyme inhibition</subject><subject>enzyme inhibitors</subject><subject>Female</subject><subject>in vitro studies</subject><subject>Inhibitory Concentration 50</subject><subject>Injections, Intravenous - veterinary</subject><subject>Injections, Subcutaneous - veterinary</subject><subject>intravenous injection</subject><subject>Isoenzymes - antagonists &amp; inhibitors</subject><subject>Isoenzymes - blood</subject><subject>isozymes</subject><subject>Life Sciences</subject><subject>lipopolysaccharides</subject><subject>Male</subject><subject>nonsteroidal anti-inflammatory agents</subject><subject>pharmacokinetics</subject><subject>prostaglandin synthase</subject><subject>robenacoxib</subject><subject>subcutaneous injection</subject><subject>temporal variation</subject><subject>Thromboxane B2 - biosynthesis</subject><subject>Thromboxane B2 - blood</subject><subject>Thromboxane B2 - metabolism</subject><issn>0140-7783</issn><issn>1365-2885</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkMtu1DAUQC0EotPCL4C3LBJ84_iRBYvRlD7QqEXqtEVsLMfjdDxk4ioObdKvx2mq6RZvfGWfcxcHIQwkhXi-blOgnCWZlCzNCJEpAUIh7d-g2f7jLZoRyEkihKQH6DCELSGESoD36AAK4JAzOkO_jl1V2dY2ndM1ds3Gla5zvsG-wmYwtff9cGcbHSx2wdvmadjZEDncbSw2usPl8DxeXM3Pj3Hry8ga37vyA3pX6TrYjy_3Ebo--b5anCXLy9PzxXyZGCYKSArJqNFATJ6vpRA5B2ZtQXlZZAQKTSpTGql5bm3F7bq0JWVknQsuiWSZ1JoeoS_T3o2u1X3rdrodlNdOnc2XanwjGecihniAyMqJNa0PobXVXgCixrBqq8Z-auynxrDqOazqo_ppUu__lju7fhVfSkbg2wQ8utoO_71Y_bj5OU7RTybfhc72e1-3fxQXVDB1e3Gqbherk9XqplC_I_954ivtlb5rXVDXV7EZJcBkDsDoP7Ddns8</recordid><startdate>200902</startdate><enddate>200902</enddate><creator>GIRAUDEL, J.M</creator><creator>TOUTAIN, P.-L</creator><creator>KING, J.N</creator><creator>LEES, P</creator><general>Oxford, UK : Blackwell Publishing Ltd</general><general>Blackwell Publishing Ltd</general><general>Wiley-Blackwell</general><scope>FBQ</scope><scope>BSCLL</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>1XC</scope></search><sort><creationdate>200902</creationdate><title>Differential inhibition of cyclooxygenase isoenzymes in the cat by the NSAID robenacoxib</title><author>GIRAUDEL, J.M ; 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Based on a clinically recommended dosage regimen of 2 mg/kg, it was predicted that the corresponding mean robenacoxib blood concentration over the first 12 h after drug administration corresponded to 5% inhibition of COX-1 and 90% inhibition of COX-2.</abstract><cop>Oxford, UK</cop><pub>Oxford, UK : Blackwell Publishing Ltd</pub><pmid>19161453</pmid><doi>10.1111/j.1365-2885.2008.01031.x</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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identifier ISSN: 0140-7783
ispartof Journal of veterinary pharmacology and therapeutics, 2009-02, Vol.32 (1), p.31-40
issn 0140-7783
1365-2885
language eng
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subjects Animals
Anti-Inflammatory Agents, Non-Steroidal - administration & dosage
Anti-Inflammatory Agents, Non-Steroidal - blood
Anti-Inflammatory Agents, Non-Steroidal - pharmacokinetics
Anti-Inflammatory Agents, Non-Steroidal - pharmacology
Area Under Curve
cats
Cats - blood
Cats - metabolism
Cyclooxygenase 1 - metabolism
Cyclooxygenase 2 - metabolism
Cyclooxygenase 2 Inhibitors - administration & dosage
Cyclooxygenase 2 Inhibitors - blood
Cyclooxygenase 2 Inhibitors - pharmacokinetics
Cyclooxygenase 2 Inhibitors - pharmacology
Cyclooxygenase Inhibitors - administration & dosage
Cyclooxygenase Inhibitors - blood
Cyclooxygenase Inhibitors - pharmacokinetics
Cyclooxygenase Inhibitors - pharmacology
Dose-Response Relationship, Drug
enzyme inhibition
enzyme inhibitors
Female
in vitro studies
Inhibitory Concentration 50
Injections, Intravenous - veterinary
Injections, Subcutaneous - veterinary
intravenous injection
Isoenzymes - antagonists & inhibitors
Isoenzymes - blood
isozymes
Life Sciences
lipopolysaccharides
Male
nonsteroidal anti-inflammatory agents
pharmacokinetics
prostaglandin synthase
robenacoxib
subcutaneous injection
temporal variation
Thromboxane B2 - biosynthesis
Thromboxane B2 - blood
Thromboxane B2 - metabolism
title Differential inhibition of cyclooxygenase isoenzymes in the cat by the NSAID robenacoxib
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