Animals will be given intra-articular injections into one tibia-tarsal (ankle) joint with 10 µl (mice) or 30 µl (rats) of monosodium urate (MSU) crystals (25 mg/ml) or PBS.
Significant swelling in the ankle is seen by 12 hour post injection and remains elevated out to 3 days post injection. An increase in foot sensitivity, as measured by von Frey filaments, occurs by 24 hours post injection and continues to day 3. Weight differences are also seen in the MSU injected paw versus PBS.
Animals are observed daily for significant clinical signs, moribundity and mortality. Body weights and caliper measurements will be taken. Von Frey assessment of pain can be performed.
Histopathology may also be done.
Current treatments of gout include nonsteroidal anti-inflammatory drugs (NSAIDSs), steroids, or colchicine. For some patients these treatments may not be effective in treating gout or have adverse side effects1,2. The MSU-induced inflammation model provides a good, simple screening tool to test compounds, and to further understand the complex interplay of inflammation and pain.
For more information about MSU-Induced Arthritis (Mice and Rats), contact us here.