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Semin Thromb Hemost 2000; 26(5): 589-594
DOI: 10.1055/s-2000-13215
Copyright © 2000 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA. Tel.: +1(212) 584-4662

The Hepatic Microvascular Responses to Sepsis

Axel Ring, Wolfgang Stremmel
  • Department of Medicine IV, University of Heidelberg, Heidelberg, Germany
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Publikationsdatum:
31. Dezember 2000 (online)

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ABSTRACT

The liver is believed to play a major role in the initiation of multiorgan failure, the most lethal complication in the clinical course of sepsis. Microbes and their virulence factors enter the hepatic circulation where they first activate sinusoidal endothelial cells and Kupffer cells to produce proinflammatory mediators, including TNF-α, IL-1, IL-6, reactive oxygen metabolites, and eicosanoids. These mediators cause not only microbial killing, but also structural and functional liver damage concerning mainly the parenchymal cells. Leukocytes are targeted to the liver sinusoids by chemoattractants and, like platelets, tether to the sinusoidal endothelial cells, which are in a procoagulant state of inflammatory activation. Clogging of the sinusoids by these cells leads to a decrease of blood flow through the sinusoids, which is further aggravated by endothelin-1 effectuating the constriction of hepatic stellate cells in the sinusoids. In contrast, both nitric oxide (NO) and carbon monoxide (CO) act as antagonists of endothelin-1 by mediating relaxation of sinusoidal vessels. By maintaining an adequate sinusoidal perfusion, both NO and CO are hepatoprotective during the early, hyperdynamic phase of sepsis characterized by an increased cardiac output and moderate peripheral vasodilation. However, during the late, hypodynamic phase of sepsis, massive overproduction of NO by the inducible NO synthase leads to circulatory collapse, which inevitably includes breakdown of the liver circulation.

KEYWORD

Liver - sepsis - microcirculation - sinusoids - endothelial cells

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