title: In vivo effect of celecoxib and tenoxicam on oxidant/ anti-oxidant status of patients with knee osteoarthritis.
abstract: The aim of this study was to compare the in vivo effects on free radical metabolism of 2 non-steroidal anti-inflammatory drugs (NSAIDs): tenoxicam, an oxicam preferentially cyclooxygenase-1 (COX-1) inhibitor, and celecoxib, a sulfonamide selective COX-2 inhibitor. The serum levels of oxidative stress-related enzymes (ie, xanthine oxidase (XO), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px)), of a lipid peroxidation marker (malondialdehyde (MDA)), and of nitric oxide (NO) in patients with knee osteoarthritis were studied at baseline and after a 4-wk course of treatment with celecoxib (n = 11) and tenoxicam (n = 12). Celecoxib-treated patients had significant decrease in nitrite levels (p = 0.043), whereas SOD, XO, GSH-Px enzyme activities, and MDA levels did not change significantly compared to baseline. Tenoxicam-treated patients had significant decrease in nitrite levels (p = 0.036) and XO activity (p = 0.01), but their SOD, GSH-Px enzyme activities, and MDA levels were unchanged from baseline. There was significant correlation between the patients' (n = 23) Western Ontario and McMaster Universities (WOMAC) LK3.0 Osteoarthritis Index, WOMAC-pain scores, and MDA levels (r = 0.50, p = 0.014) and the patients' WOMAC-stiffness scores and XO enzyme activity (r = 0.46, p = 0.027) at baseline. Significant improvement was found in pain-VAS, patients' global assessment, and WOMAC pain, stiffness, and physical function scores in celecoxib and tenoxicam-treated groups. In summary, our study revealed that tenoxicam may have antioxidant effects, and that celecoxib and tenoxicam may reduce nitrite levels, indicating an alteration of NO pathways.
authors.affiliation: Division of Rheumatology, Department of Physical Medicine and Rehabilitation, Firat University Faculty of Medicine, Elazig, Turkey. sozgocmen@hotmail.com
authors.forename: Salih
authors.initials: S
authors.lastname: Ozgocmen
authors.forename: Ozge
authors.initials: O
authors.lastname: Ardicoglu
authors.forename: Hasan
authors.initials: H
authors.lastname: Erdogan
authors.forename: Ersin
authors.initials: E
authors.lastname: Fadillioglu
authors.forename: Huseyin
authors.initials: H
authors.lastname: Gudul
mesh_terms: D000328:Adult; D000368:Aged; D000068579:Celecoxib; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008297:Male; D008565:Membrane Proteins; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000188:drug therapy / Q000378:metabolism*; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000187:drug effects; D010894:Piroxicam / Q000031:analogs & derivatives* / Q000627:therapeutic use*; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism; D011720:Pyrazoles / Q000627:therapeutic use*; D017382:Reactive Oxygen Species / Q000097:blood; D013449:Sulfonamides / Q000627:therapeutic use*
chemical_list: D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D008565:Membrane Proteins; D011720:Pyrazoles; D017382:Reactive Oxygen Species; D013449:Sulfonamides; D010894:Piroxicam; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; C496511:PTGS1 protein, human; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D000068579:Celecoxib; C032801:tenoxicam