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Sinusoidal circulatory disturbance by microthrombosis as a cause of endotoxin-induced hepatic injury
Abstract:
The present study was undertaken in rats to examine the significance of sinusoidal circulatory disturbance by microthrombosis in the pathogenesis of hepatic damage and dysfunction due to endotoxin. Administration of endotoxin induced fibrin deposits and infiltration of polymorphonuclear leukocytes in the sinusoids, focal random coagulative hepatocellular necrosis and elevation of serum transaminase activities. When heparin was given simultaneously with endotoxin, the formation of fibrin thrombus in the sinusoids was prevented, and the endotoxin-induced morphological and functional changes in the liver were markedly inhibited. Infusion of thrombin into the portal vein induced a large amount of fibrin thrombi in the sinusoids, focal random necrotic foci resembling the lesions produced by endotoxin and elevation of levels of serum transaminases. These experimental data suggest that disturbance of hepatic microcirculation by sinusoidal thrombosis is the necessary and sufficient condition for the development of endotoxin-induced hepatic injury.
Insights
Endotoxin causes liver damage by creating blood clots in liver sinusoids. Preventing these clots with heparin significantly reduces liver injury, indicating microcirculatory disturbance is key to endotoxin-induced hepatic damage.
Area of Science:
- Hepatology
- Pathophysiology
- Microcirculation
Background:
- Endotoxin administration is known to cause liver injury.
- The precise mechanisms underlying endotoxin-induced hepatic damage are not fully understood.
- Sinusoidal circulatory disturbance has been implicated in liver dysfunction.
Purpose of the Study:
- To investigate the role of sinusoidal microthrombosis in endotoxin-induced liver damage and dysfunction.
- To elucidate the pathogenic significance of microcirculatory disturbances in the liver.
Main Methods:
- Rats were administered endotoxin to induce hepatic injury.
- Heparin was administered concurrently with endotoxin to assess its protective effects.
- Thrombin was infused into the portal vein to model sinusoidal thrombosis.
- Liver morphology, sinusoid patency, and serum transaminase levels were analyzed.
Main Results:
- Endotoxin administration led to fibrin deposits, leukocyte infiltration in sinusoids, hepatocellular necrosis, and elevated serum transaminases.
- Concurrent heparin administration prevented fibrin thrombus formation and markedly inhibited endotoxin-induced liver damage.
- Thrombin infusion induced sinusoidal fibrin thrombi and liver lesions similar to those caused by endotoxin.
Conclusions:
- Sinusoidal microthrombosis is a critical factor in the pathogenesis of endotoxin-induced hepatic injury.
- Disturbance of hepatic microcirculation by thrombosis is both necessary and sufficient for endotoxin-induced liver damage.
- Targeting sinusoidal thrombosis may offer a therapeutic strategy for endotoxin-related liver dysfunction.