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Updated: Aug 23, 2026
Isolation of Regenerating Hepatocytes after Partial Hepatectomy in Mice
Published on: December 2, 2022
Impaired hepatocyte regeneration in toll-like receptor 4 mutant mice
Grace L Su1, Stewart C Wang, Alireza Aminlari
1Medical Service, Veterans Affairs Ann Arbor Health Care Systems, Ann Arbor, Michigan, USA. gsu@umich.edu
Abstract:
Multiple lines of evidence suggest a role for endogenous lipopolysaccharides in toxin-induced liver injury. Toll-like receptor 4 has recently been implicated as a cell surface receptor important for lipopolysaccharide responsiveness. In these experiments, we sought to determine the role of toll-like receptor 4 in acute liver injury by carbon tetrachloride by utilizing the naturally occurring toll-like receptor 4 mutant and wild-type mice strains. Mice were injected with either carbon tetrachloride or the carrier. Serum transaminase levels peaked at 24 hr after carbon tetrachloride administration for both wild-type and mutant mice, with no significant histological difference in initial liver injury between the two groups. However, an overall decrease in hepatocyte proliferation was found in the mutant mice. Examination of the liver tissue revealed significant decreases in intrahepatic expressions of proinflammatory mediators. In conclusion, our results suggest that toll-like receptor 4 is important in the hepatic regenerative response to CCl4 liver injury via its role in modulating the inflammatory response to hepatic injury.
Insights
Toll-like receptor 4 (TLR4) plays a key role in liver regeneration after carbon tetrachloride (CCl4) injury. Modulating the inflammatory response via TLR4 is crucial for hepatocyte proliferation and recovery.
Area of Science:
- Hepatology
- Immunology
- Toxicology
Background:
- Endogenous lipopolysaccharides (LPS) are implicated in toxin-induced liver injury.
- Toll-like receptor 4 (TLR4) is a cell surface receptor crucial for LPS responsiveness.
Purpose of the Study:
- To investigate the role of TLR4 in acute liver injury induced by carbon tetrachloride (CCl4).
- To compare liver injury and regeneration in wild-type and TLR4-mutant mice.
Main Methods:
- Administration of CCl4 or a carrier to wild-type and TLR4-mutant mice.
- Assessment of serum transaminase levels and liver histology.
- Evaluation of hepatocyte proliferation and intrahepatic expression of inflammatory mediators.
Main Results:
- Serum transaminase levels and initial liver injury were similar in both groups at 24 hours post-CCl4.
- TLR4-mutant mice exhibited decreased hepatocyte proliferation.
- Reduced intrahepatic expression of proinflammatory mediators was observed in mutant mice.
Conclusions:
- TLR4 is essential for the hepatic regenerative response following CCl4-induced liver injury.
- TLR4 modulates the inflammatory response, influencing liver repair and regeneration.
