Twenty-five dogs were included in a randomized, double-blind trial to assess the efficacy of doxycycline (DOX) orally administered twice a day at 4 mg/kg/day (n = 12) for the treatment of osteoarthritis of the hip. Chondroitin sulfate (CS; 525 mg/day) was used as a positive control (n = 13). Dogs were re-examined monthly for 6 months after initiation of treatment. The assessment protocol included clinical score, radiographic findings and serum osteoarthritis biomarkers. Dogs treated with DOX showed statistically significant improvements (p < 0.05) in lameness, joint mobility, pain on palpation, weight-bearing and overall score at 2, 6, 4, 4 and 4 months, respectively, after treatment. Biomarker levels of CS-WF6 epitope and hyaluronan were significantly increased and decreased (p < 0.05) at 2 and 3 months after treatment compared to pretreatment. These results showed that DOX had a positive therapeutic effect in dogs with osteoarthritis.
Animals ; Biological Markers/blood ; Dog Diseases/*drug therapy ; Dogs ; Doxycycline/*therapeutic use ; Female ; Hyaluronic Acid/blood ; Joints/drug effects ; Lameness, Animal/drug therapy ; Male ; Osteoarthritis, Hip/drug therapy/*veterinary ; Time Factors ; Treatment Outcome

Hip dysplasia (HD) is one of the most important bone and joint diseases in dogs. Making the radiographic diagnosis is sometime possible when the disease has markedly progressed. Chondroitin sulfate (CS) and hyaluronan (HA) are the most important cartilage biomolecules that are elevated in the serum taken from dogs with osteoarthritis. The serum CS and HA can be detected by an ELISA technique, with using monoclonal antibodies against CS epitope 3B3 and WF6 and the HA chain as the primary antibodies. The aim of this study was to compare the levels of serum CS (both epitopes) and HA in non-HD and HD dogs. All 123 dogs were categorized into 2 groups. The non-HD group was composed of 98 healthy dogs, while the HD group was comprised of 25 HD dogs. Blood samples were collected for analyzing the serum CS and HA levels with using the ELISA technique. The results showed that the average serum level of the CS epitope WF6 in the HD group (2,594 +/- 3,036.10 ng/ml) was significantly higher than that in the non-HD group (465 +/- 208.97 ng/ml) (p < 0.01) while the epitope 3B3 in the HD group (105 +/- 100.05 ng/ml) was significantly lower than that in the non-HD group (136 +/- 142.03 ng/ml) (p < 0.05). The amount of serum HA in the HD group (134.74 +/- 59.71 ng/ml) was lower than that in the non HD group (245.45 +/- 97.84 ng/ml) (p < 0.05). The results indicate that the serum CS and HA levels might be used as biomarkers for osteoarthritis in HD dogs.
Animals ; Biological Markers/*blood ; Body Weight ; Chondroitin Sulfates/*blood ; Dog Diseases/*blood ; Dogs ; Enzyme-Linked Immunosorbent Assay ; Female ; Hip Dysplasia, Canine/*blood/epidemiology ; Hyaluronic Acid/*blood ; Male ; Osteoarthritis/blood/*veterinary ; Prevalence ; Sex Characteristics