Anti-inflammatory testing methods: comparative evaluation of mice and rats

Area of Science:

• Pharmacology
• Inflammation Research
• Drug Discovery

Background:

• Traditional anti-inflammatory screening methods often utilize rats.
• Investigating alternative animal models is crucial for efficiency and ethical considerations in drug development.

Purpose of the Study:

• To evaluate the efficacy of using mice as a substitute for rats in anti-inflammatory screening.
• To compare the responses of mice and rats to standard anti-inflammatory drugs across multiple inflammation models.

Main Methods:

• Carrageenan-induced paw edema, formalin-induced paw edema, adjuvant arthritis, and cotton pellet granuloma models were employed.
• Standard anti-inflammatory drugs including prednisolone, indomethacin, aspirin, flufenamic acid, phenylbutazone, and cyproheptadine were administered orally.
• Drug efficacy was assessed by comparing responses between mice and rats.

Main Results:

• Mice and rats exhibited similar responses to prednisolone and indomethacin across the tested inflammation models.
• Prednisolone, indomethacin, phenylbutazone, and aspirin demonstrated significant anti-inflammatory effects in both species.
• Flufenamic acid showed limited efficacy, while cyproheptadine specifically inhibited formalin and serotonin-induced edema.

Conclusions:

• Mice serve as a viable and effective alternative to rats for anti-inflammatory drug screening.
• The observed similarities in drug response validate the use of mice in preclinical anti-inflammatory assessments, streamlining drug discovery processes.