Absence of toll-like receptor 4 (TLR4) signaling in the donor organ reduces ischemia and reperfusion injury in a murine liver transplantation model

Authors

  • Xiu-Da Shen,

    1. Dumont-University of California, Los Angeles (UCLA) Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA
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  • Bibo Ke,

    1. Dumont-University of California, Los Angeles (UCLA) Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA
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  • Yuan Zhai,

    1. Dumont-University of California, Los Angeles (UCLA) Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA
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  • Feng Gao,

    1. Dumont-University of California, Los Angeles (UCLA) Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA
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  • Sei-Ichiro Tsuchihashi,

    1. Dumont-University of California, Los Angeles (UCLA) Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA
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  • Charles R. Lassman,

    1. Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA
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  • Ronald W. Busuttil,

    1. Dumont-University of California, Los Angeles (UCLA) Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA
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  • Jerzy W. Kupiec-Weglinski

    Corresponding author
    1. Dumont-University of California, Los Angeles (UCLA) Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA
    2. Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA
    • Dumont-UCLA Transplant Center 77-120 CHS, 10833 Le Conte Ave, Los Angeles, CA 90095
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    • Telephone: (310) 825-4196; FAX: (310) 267-2358


Abstract

This study analyzes how toll-like receptor 4 (TLR4) signaling in the donor organ affects the ischemia and reperfusion injury (IRI) sequel following liver transplantation. Isogenic orthotopic liver transplantations (OLTs) with rearterialization were performed in groups of wild-type (WT) and TLR4 knockout (KO) mice after donor liver preservation in University of Wisconsin solution at 4°C for 24 hours. Unlike WT OLTs, TLR4-deficient OLTs transplanted to either WT or TLR4 KO recipients suffered significantly less hepatocellular damage, as evidenced by serum alanine aminotransferase levels, and histological Suzuki's grading of liver IRI. Disruption of TLR4 signaling in OLTs decreased local neutrophil sequestration, CD4+ T cell infiltration, interferon (IFN)-γ-inducible protein 10 (CXCL10) and an intercellular adhesion molecule (ICAM-1), as well as tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-2, and IFN-γ, yet increased IL-4 and IL-10 expression. The well-functioning OLTs from TLR4 KO donors revealed attenuated activity of capase-3, and enhanced heme oygenase-1 (HO-1) expression, along with decreased levels of apoptotic endothelial cells/hepatocytes, as compared with WT OLTs with intact TLR4 signaling. Thus, the functional sentinel TLR4 complex in the donor organ plays a key role in the mechanism of hepatic IRI after OLT. Disruption of TLR4 pathway downregulated the early proinflammatory responses and ameliorated hepatic IRI. These results provide the rationale to locally modify innate TLR4 signaling in the donor organ to more efficiently control the adaptive posttransplantation IRI-dependent responses. Liver Transpl 13:1435–1443, 2007. © 2007 AASLD.

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