Related Experiment Videos
A new assay for antiphlogistic activity: zymosan-induced mouse ear inflammation
1Department of Pharmacology, Institute for Drug Research Ltd., Budapest, Hungary.
Abstract:
A new model of local inflammation has been developed: intradermal zymosan-induced mouse ear edema. The symptoms of inflammation induced by injecting zymosan into one of the ears were followed up for 72 h. The ear edema and the local accumulation of polymorphonuclear leukocytes' (PMN) marker enzyme, myeloperoxidase (MPO), were determined. Edema peaked at 4-6 h, while MPO activity peaked at 24 h after zymosan application. The correlation between inflammatory response and concentration of zymosan was also tested. Of the various concentrations tested, 1% suspension has been found optimal. Anti-inflammatory drugs and mediator antagonists were examined in order to establish the selectivity and sensitivity of the assay. A glucocorticoid (dexamethasone), two cyclooxygenase inhibitors (indomethacin, piroxicam) and an interleukin-1 (IL-1) release inhibitor (IX 207-887, Sandoz) all reduced edema and MPO activity as well. However, a lipoxygenase inhibitor (phenidone), a serotonin receptor antagonist (methysergide) and H1 and H2 receptor antagonists (clemastine and cimetidine, respectively) all failed to inhibit the reaction.
Insights
A novel mouse ear edema model using zymosan effectively simulates local inflammation. This model accurately measures inflammation markers and drug efficacy, showing promise for anti-inflammatory research.
Area of Science:
- Immunology
- Pharmacology
Background:
- Local inflammation models are crucial for studying inflammatory processes.
- Zymosan-induced mouse ear edema offers a reproducible method to investigate inflammation.
Purpose of the Study:
- To develop and characterize a new model of local inflammation using intradermal zymosan injection in mice.
- To assess the model's sensitivity and selectivity using various anti-inflammatory agents.
Main Methods:
- Intradermal injection of zymosan into mouse ears to induce edema and inflammation.
- Measurement of ear edema and myeloperoxidase (MPO) activity over 72 hours.
- Testing the effects of different zymosan concentrations and various anti-inflammatory drugs.
Main Results:
- Edema peaked at 4-6 hours, while MPO activity peaked at 24 hours post-injection.
- A 1% zymosan suspension was found to be optimal for inducing a consistent inflammatory response.
- Dexamethasone, indomethacin, piroxicam, and an IL-1 inhibitor reduced edema and MPO activity, validating the model.
Conclusions:
- The intradermal zymosan-induced mouse ear edema model is a sensitive and selective assay for evaluating local inflammation.
- This model can be utilized to screen potential anti-inflammatory drugs targeting specific pathways.