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Invasive Hemodynamic Characterization of the Portal-hypertensive Syndrome in Cirrhotic Rats
Published on: August 1, 2018
Biology of portal hypertension
Matthew McConnell1, Yasuko Iwakiri2
1Department of Internal Medicine, Section of Digestive Diseases, Yale University School of Medicine, 1080 LMP, 333 Cedar St., New Haven, CT, 06520, USA.
Insights
Portal hypertension stems from liver disease, causing increased resistance and complications. This review explores microvascular thrombosis and platelet roles in its development and progression.
Area of Science:
- Hepatology
- Vascular Biology
- Gastroenterology
Background:
- Portal hypertension arises from increased intrahepatic vascular resistance, often due to chronic liver disease.
- Pathological mechanisms include fibrosis, liver sinusoidal endothelial cell (LSEC) dysfunction, and hepatic stellate cell (HSC) activation.
- The roles of microvascular thrombosis and platelet function in portal hypertension pathogenesis are not fully understood.
Purpose of the Study:
- To review the mechanisms of sinusoidal portal hypertension.
- To highlight the significance of microvascular thrombosis and platelet function.
- To discuss the mesenteric vasculature and future research directions in portal hypertension.
Main Methods:
- Literature review of existing studies on portal hypertension.
- Focus on HSC and LSEC biology.
- Analysis of microvascular thrombosis and platelet roles.
Main Results:
- Chronic liver disease causes structural distortion and increased resistance in the liver vasculature.
- Dysregulation of LSECs and HSCs, along with microvascular thrombosis and platelet activation, contribute to portal hypertension.
- Portal hypertension leads to splanchnic vasodilation, hyperdynamic circulation, and severe complications.
Conclusions:
- Further research is needed to clarify the role of microvascular thrombosis and platelets in portal hypertension.
- Understanding these mechanisms is crucial for developing targeted therapies.
- Future research should focus on vascular biology aspects of portal hypertension.
Abstract:
Portal hypertension develops as a result of increased intrahepatic vascular resistance often caused by chronic liver disease that leads to structural distortion by fibrosis, microvascular thrombosis, dysfunction of liver sinusoidal endothelial cells (LSECs), and hepatic stellate cell (HSC) activation. While the basic mechanisms of LSEC and HSC dysregulation have been extensively studied, the role of microvascular thrombosis and platelet function in the pathogenesis of portal hypertension remains to be clearly characterized. As a secondary event, portal hypertension results in splanchnic and systemic arterial vasodilation, leading to the development of a hyperdynamic circulatory syndrome and subsequently to clinically devastating complications including gastroesophageal varices and variceal hemorrhage, hepatic encephalopathy from the formation of portosystemic shunts, ascites, and renal failure due to the hepatorenal syndrome. This review article discusses: (1) mechanisms of sinusoidal portal hypertension, focusing on HSC and LSEC biology, pathological angiogenesis, and the role of microvascular thrombosis and platelets, (2) the mesenteric vasculature in portal hypertension, and (3) future directions for vascular biology research in portal hypertension.
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