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Type 2 diabetic rats are sensitive to thioacetamide hepatotoxicity
Sharmilee P Sawant1, Ankur V Dnyanmote, Alan Warbritton
1Department of Toxicology, College of Pharmacy, The University of Louisiana at Monroe, 700 University Avenue, Sugar Hall # 306, Monroe, LA 71209-0470, USA.
Toxicology and Applied Pharmacology
|September 13, 2005
Summary
Type 2 diabetes increases liver injury sensitivity. Impaired tissue repair in diabetic rats leads to progressive liver damage and mortality from hepatotoxicants, unlike in non-diabetic rats.
Area of Science:
- Hepatology
- Toxicology
- Diabetology
Background:
- Type 2 diabetes (DB) confers heightened sensitivity to hepatotoxicants.
- Previous studies showed inhibited compensatory tissue repair in DB rats exposed to CCl4.
- This study investigates the role of impaired tissue repair in diabetes-associated hepatotoxicity using thioacetamide (TA).
Purpose of the Study:
- To determine the importance of compensatory tissue repair in the outcome of liver injury in type 2 diabetic rats.
- To assess the impact of thioacetamide-induced liver injury in type 2 diabetic versus non-diabetic rats.
- To elucidate the mechanisms underlying increased hepatotoxicity in diabetes.
Main Methods:
- Administered a normally nonlethal dose of thioacetamide (TA) to type 2 diabetic (DB) and non-diabetic rats.
- Monitored survival rates, liver injury markers (ALT, AST), and hepatic necrosis over 96 hours.
- Assessed TA bioactivation via radiolabel binding and measured cell proliferation (DNA synthesis, PCNA).
Main Results:
- Thioacetamide caused 100% mortality in DB rats within 24-48 hours, while non-DB rats survived with transient injury.
- Liver injury rapidly progressed in DB rats, leading to hepatic failure.
- Similar TA bioactivation occurred in both groups, but S-phase DNA synthesis and cell cycle progression were inhibited in DB rats.
Conclusions:
- Inhibited compensatory tissue repair and cell division in type 2 diabetic rats lead to progressive liver injury and mortality.
- Type 2 diabetes, like type 1, increases susceptibility to various hepatotoxicants due to impaired tissue repair.
- This heightened hepatotoxicity in diabetes occurs irrespective of insulin presence.