Leukotriene b 4/leukotriene b 4 receptor pathway is involved in hepatic microcirculatory dysfunction elicited by endotoxin

Sohei Ito, Yoshiya Ito, Hiroyuki Katagiri, Tatsunori Suzuki, Sumio Hoka, Takehiko Yokomizo, Takao Shimizu, Masataka Majima

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12 Citations (Scopus)

Abstract

Leukotrienes (LTs), metabolites of arachidonic acid through 5-lipoxygenase (5-LOX), have been known to play a role in leukocyte recruitment. However, the contribution of LTB 4 to liver microcirculatory dysfunction during endotoxemia remains unknown. LTB 4 receptor (BLT1) has been identified as a high-affinity receptor specific for LTB 4. The present study was conducted to examine the roles of LTB 4 and BLT1 in hepatic microcirculatory dysfunction elicited by LPS in mice. The number of leukocytes adhering to the endothelial cells of the hepatic microvessels and perfused sinusoids was determined 4 h after the administration of LPS (0.3 mg/kg, i.v.) to male C57B16 mice by in vivo microscopy. A 5-LOX synthase inhibitor, AA-861 (10 or 100 mg/kg, s.c.), was administered 30 min before LPS injection. BLT1 knockout mice were used to investigate whether LPS-induced hepatic microcirculatory dysfunction is mediated by BLT1 signaling. The expression of 5-LOX, intercellular adhesion molecule (ICAM) 1, and TNF-α in the liver was measured by real-time reverse-transcriptase-polymerase chain reaction. The administration of LPS caused significant accumulation of leukocyte adhesion to the hepatic microvessels and reduced sinusoidal perfusion when compared with saline-treated mice. The hepatic microcirculatory dysfunction elicited by LPS was minimized in mice pretreated with AA-861 or in BLT1 knockout mice. This was associated with the suppression of hepatic expression of 5-LOX, ICAM-1, and TNF-α. These findings suggest that the LTB 4/BLT1 pathway mediates hepatic microcirculatory dysfunction by enhanced expression of ICAM-1 and TNF-α in a murine model of endotoxemia.

Original languageEnglish
Pages (from-to)87-91
Number of pages5
JournalShock
Volume30
Issue number1
DOIs
Publication statusPublished - Jul 2008

All Science Journal Classification (ASJC) codes

  • Emergency Medicine
  • Critical Care and Intensive Care Medicine

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    Ito, S., Ito, Y., Katagiri, H., Suzuki, T., Hoka, S., Yokomizo, T., Shimizu, T., & Majima, M. (2008). Leukotriene b 4/leukotriene b 4 receptor pathway is involved in hepatic microcirculatory dysfunction elicited by endotoxin. Shock, 30(1), 87-91. https://doi.org/10.1097/SHK.0b013e31815d06a1