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Endotoxin inhibits glucuronidation in the liver. An effect mediated by intercellular communication
11st Institute of Biochemistry, Semmelweis University of Medicine, Budapest, Hungary.
Endotoxin (lipopolysaccharide) impairs liver glucuronidation, an effect preventable by cyclooxygenase inhibitors. This suggests endotoxin-induced inhibition is mediated by intercellular communication involving eicosanoids.
Area of Science:
- Pharmacology
- Hepatology
- Biochemistry
Background:
- Endotoxin (lipopolysaccharide, LPS) is a potent immune activator.
- Liver metabolism, including drug conjugation, can be affected by inflammatory mediators.
- Glucuronidation and sulfation are key Phase II metabolic pathways in the liver.
Purpose of the Study:
- To investigate the effect of endotoxin on p-nitrophenol conjugation in the perfused mouse liver.
- To explore the role of eicosanoids and cyclooxygenase pathway in endotoxin-induced metabolic changes.
- To compare the effects of endotoxin in a whole organ system versus isolated cells.
Main Methods:
- Perfused mouse liver model (recirculating and non-recirculating systems).
- Administration of endotoxin (lipopolysaccharide), cyclooxygenase inhibitors, PGD2, and PGE2.
- Measurement of p-nitrophenol glucuronidation and sulfation.
- Experiments with isolated hepatocytes.
Main Results:
- Endotoxin increased glucose production and inhibited p-nitrophenol glucuronidation in perfused liver, while sulfation remained unchanged.
- Cyclooxygenase inhibitors prevented endotoxin's inhibitory effects on glucuronidation.
- Prostaglandins PGD2 and PGE2 decreased p-nitrophenol glucuronidation in both perfused liver and isolated hepatocytes.
- Endotoxin did not affect p-nitrophenol conjugation in isolated hepatocytes.
Conclusions:
- Endotoxin inhibits hepatic glucuronidation, likely through an intercellular communication pathway.
- Eicosanoids, such as PGD2 and PGE2, appear to mediate endotoxin's inhibitory effects on glucuronidation.
- The liver's response to endotoxin regarding glucuronidation is dependent on intact intercellular communication.
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