Effects of hyaluronan on nitric oxide levels and superoxide dismutase activities in synovial fluid in knee osteoarthritis.
The aim of the present study was to evaluate the effects of hyaluronan (HA) on nitric oxide (NO) levels and superoxide dismutase (SOD) enzyme activities in synovial fluid (SF) in the treatment of patients with knee osteoarthritis (OA). SF samples were aspirated from OA patients before the commencement of the treatment (n=23) and 6 weeks after they were treated with HA products. NO levels and SOD activities were compared between the pre- and post-treatment of OA patients and of the control group (n=10). SF NO levels were significantly higher in patients with OA before the commencement of the treatment compared with the post-treatment (p<0.001) and the control groups. The SF SOD activity of patients before the commencement of the treatment was lower than the values in the controls and post-treatment (p<0.001). There is no significant correlation between SF NO and SOD levels and the radiographic changes of the OA knee according to Kellgren-Lawrence grading (p>0.05). Also, the Western Ontario and McMaster Universities Osteoarthritis index (WOMAC) pain scores and physical function scores were gradually improved. These findings made us think that SF NO was a potent mediator in cartilage damage in OA, whereas SOD was an antioxidant mediator in the same process. Exogenous HA injections might reduce the NO levels and increase SOD activities in synovial fluid. These effects also do not seem to be dependent on the radiographic grading of the OA knee. More comprehensive studies are needed to clarify a possible clinical significance of this topic, and we suggest that this is an important area for further research into new treatment options.
Kalaci
Aydiner
A
Department of Orthopaedics and Traumatology, Faculty of Medicine, Mustafa Kemal University, 31100, Antakya, Hatay, Turkey. orthopedi@gmail.com
Yilmaz
H Ramazan
HR
Aslan
Bahadir
B
Söğüt
Sadik
S
Yanat
Ahmet Nedim
AN
Uz
Efkan
E
D000368:Aged; D000369:Aged, 80 and over; D000893:Anti-Inflammatory Agents / Q000494:pharmacology*; D005260:Female; D006801:Humans; D006820:Hyaluronic Acid / Q000494:pharmacology*; D008297:Male; D008875:Middle Aged; D009569:Nitric Oxide / Q000378:metabolism*; D020370:Osteoarthritis, Knee / Q000188:drug therapy* / Q000201:enzymology; D013482:Superoxide Dismutase / Q000187:drug effects / Q000378:metabolism*; D013582:Synovial Fluid / Q000187:drug effects / Q000201:enzymology
D000893:Anti-Inflammatory Agents; D009569:Nitric Oxide; D006820:Hyaluronic Acid; D013482:Superoxide Dismutase