Changes in hepatic function tests to induced toxicity in the bovine liver

Area of Science:

• Veterinary Medicine
• Hepatology
• Toxicology

Background:

• Dairy cows are susceptible to liver damage.
• Accurate diagnostic tests are crucial for assessing hepatic health in cattle.
• Carbon tetrachloride is a known hepatotoxin used to induce experimental liver injury.

Purpose of the Study:

• To evaluate the sensitivity of various hepatic diagnostic tests in dairy cows.
• To determine the dose-dependent effects of carbon tetrachloride on liver function and histology.
• To identify reliable biomarkers for detecting subclinical and clinical liver damage in cattle.

Main Methods:

• Graded doses of carbon tetrachloride were administered orally to lactating dairy cows.
• Serum enzymes (SDH, GGT, AST, ALP, GPT, LDH), bilirubin, and BSP clearance were measured.
• Liver biopsies were analyzed for histological changes and cytochrome P-450 content.
• Dose escalation led to non-fatal hepatic changes for test sensitivity evaluation.

Main Results:

• Carbon tetrachloride induced dose-dependent hepatic damage, ranging from no pathological changes to mild/moderate necrosis.
• Hepatic cytochrome P-450 content decreased in all treated groups.
• Elevated serum activities of sorbitol dehydrogenase (SDH), gamma-glutamyl transferase (GGT), and glutamic-oxaloacetic transaminase (AST) were observed in higher-dose groups (3 and 4).
• Other tested parameters (ALP, GPT, LDH, bilirubin, urobilinogen, BSP clearance) showed no significant differences.

Conclusions:

• Sorbitol dehydrogenase, gamma-glutamyl transferase, and glutamic-oxaloacetic transaminase are sensitive indicators of hepatic damage in dairy cows.
• Lower doses of carbon tetrachloride may not induce detectable changes in all commonly used liver diagnostic tests.
• Histological evaluation and cytochrome P-450 levels provide further evidence of hepatotoxicity.