Stellate Cells and the Microcirculation



Activation of hepatic stellate cells (HSCs) within hepatic sinusoids during chronic liver diseases is a key feature of the capillarization of sinusoids. This latter feature likely represents an initial cause of portal hypertension during the early development of hepatic fibrosis. Contraction of activated HSC occurs in vitro in response to different vasoconstrictors, and this feature may have important implications in the pathogenesis of portal hypertension and in the contraction of mature scar tissue. In cirrhotic liver, portal blood flow is largely diverted toward the systemic circulation through portal-central anastomoses. These neoformed vascular structures, although representing direct connections between the portal and the systemic circulation, follow irregular patterns, are site of thrombotic events, and are embedded in developing scar tissue. This tissue is characterized by the presence of different types of ECM-producing cells, all potentially able to contract in response to vasocostrictors (e.g., ET-1) released within cirrhotic liver tissues. It is implicit that cell contraction in response to these agents could be antagonized by autologous vasodilators (e.g., NO) or by drugs provided with vasodilator properties.


Hepatic stellate cells Myofibroblasts Pericytes Cell contraction Liver fibrosis Cirrhosis Portal hypertension 


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© Springer New York 2011

Authors and Affiliations

  1. 1.Dipartimento di Medicina Interna, Center for Research, High Education and Transfer DENOTheUniversità degli Studi di FirenzeFirenzeItaly

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