Data on Wistar Hannover rats from a general toxicity study

Area of Science:

• Toxicology
• Pharmacokinetics
• Animal Models

Background:

• Understanding age-related physiological changes and sex-based differences is crucial for accurate toxicological assessments.
• Wistar Hannover rats are a common model organism in preclinical drug development.
• Hepatic drug-metabolizing enzymes play a key role in drug clearance and toxicity.

Purpose of the Study:

• To document chronological changes in clinical laboratory tests, pathological examinations, and hepatic drug-metabolizing enzymes in Wistar Hannover rats.
• To identify sex differences in these parameters across different age points (8, 10, 19, and 32 weeks).
• To provide reference data for assessing drug-related toxicity in this specific rat strain.

Main Methods:

• Longitudinal data collection from Wistar Hannover rats at four age points (8, 10, 19, 32 weeks).
• Analysis of serum biochemistry (triglycerides, LDL cholesterol, total protein, creatinine), cholinesterase activity, and pituitary weight.
• Measurement of hepatic cytochrome P450 enzyme activities (CYP3A2, CYP2C11).

Main Results:

• Males exhibited higher serum triglyceride and LDL cholesterol levels compared to females across all ages.
• Females showed higher serum total protein and creatinine concentrations, and cholinesterase activity than males.
• Significant sex differences were observed in pituitary weight and hepatic CYP3A2 and CYP2C11 activities.

Conclusions:

• Chronological and sex-specific data from clinical laboratory tests, pathology, and hepatic enzymes in Wistar Hannover rats are established.
• These reference values are valuable for interpreting drug-induced toxicity in preclinical studies.
• The findings support the utility of this rat strain for toxicological evaluations, considering age and sex variables.