Comparing distress of mouse models for liver damage

Area of Science:

• Animal welfare and biomedical research
• Toxicology and pharmacology

Background:

• Legal mandates require evaluation of animal experiment severity for welfare and research quality.
• Assessing animal distress typically involves multiple parameters, but optimal methodologies and parameter performance are poorly defined.

Purpose of the Study:

• To quantify the performance of burrowing activity, body weight change, and distress scores in mice models of liver damage.
• To compare the distress levels induced by bile duct ligation versus carbon tetrachloride using multivariate analysis.

Main Methods:

• Receiver operating characteristic (ROC) curve analysis was employed to assess individual parameter performance.
• Support Vector Machine (SVM) classification was utilized for multivariate analysis and comparison of animal models.
• Two distinct mouse models of liver damage were investigated: bile duct ligation and carbon tetrachloride induction.

Main Results:

• ROC analysis quantified the performance of burrowing activity, body weight change, and distress scores.
• SVM classification revealed that bile duct ligation induced significantly greater distress compared to carbon tetrachloride.
• The study provides a prototype for comparing animal models using multiple readout parameters.

Conclusions:

• Multivariate analysis methods, such as ROC and SVM, are effective for assessing and comparing animal model severity.
• Bile duct ligation is a more severe model of liver damage in mice than carbon tetrachloride induction.
• Standardized multivariate approaches are essential for future assessments and comparisons of animal models in research.