Carbon monoxide enhances early liver regeneration in mice after hepatectomy

Authors

  • Kaori Kuramitsu,

    1. Division of Transplantation, Department of Surgery, Transplant Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA
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  • David Gallo,

    1. Division of Transplantation, Department of Surgery, Transplant Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA
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  • Myunghee Yoon,

    1. Department of Surgery, Goepel Hospital and Kosin University, Busan, Korea
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  • Beek Y. Chin,

    1. Division of Transplantation, Department of Surgery, Transplant Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA
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  • Eva Csizmadia,

    1. Division of Transplantation, Department of Surgery, Transplant Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA
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  • Douglas W. Hanto,

    1. Division of Transplantation, Department of Surgery, Transplant Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA
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    • These authors contributed equally to this study.

  • Leo E. Otterbein

    Corresponding author
    1. Division of Transplantation, Department of Surgery, Transplant Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA
    • Transplant Institute, Center for life Sciences, 3 Blackfan Circle, Boston, MA 02215
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    • These authors contributed equally to this study.

    • fax: (617) 735-2844


  • Potential conflict of interest: Nothing to report.

  • Supported in part by NIH R01GM088666-01 to L.E.O. and the Julie Henry Fund at the Transplant Institute of the BIDMC.

Abstract

Hepatocyte proliferation early after liver resection is critical in restoring liver mass and preserving function as the liver regenerates. Carbon monoxide (CO) generated by heme oxygenase-1 (HO-1) strongly influences cellular proliferation and both HO-1 and CO are accepted hepatoprotective molecules. Mice lacking functional HO-1 were unable to mount an appropriate regenerative response following partial hepatectomy (PHTx) compared to wildtype controls. We therefore hypothesized that exogenous administration of CO at low, nontoxic concentrations would modulate hepatocyte (HC) proliferation and liver regeneration. Animals treated with a low concentration of CO 1 hour prior to 70% hepatectomy demonstrated enhanced expression of hepatocyte growth factor (HGF) in the liver compared to controls that correlated with a more rapid onset of HC proliferation as measured by phospho-histone3 staining, increased expression of cyclins D1 and E, phosphorylated retinoblastoma, and decreased expression of the mitotic inhibitor p21. PHTx also increased activation of the HGF receptor c-Met, which was detected more then 9 hours earlier in the livers of CO-treated mice. Blockade of c-Met resulted in abrogation of the CO effects on HC proliferation. Corresponding with increased HC proliferation, treatment with CO maintained liver function with normal prothrombin times versus a 2-fold prolongation in controls. In a lethal 85% PHTx, CO-treated mice showed a greater survival rate compared to controls. In vitro, CO increased HGF expression in hepatic stellate cells, but not HC, and when cocultured together led to increased HC proliferation. In summary, we demonstrate that administration of exogenous CO enhances rapid and early HC proliferation and, importantly, preserves function following PHTx. Taken together, CO may offer a viable therapeutic option to facilitate rapid recovery following PHTx. (HEPATOLOGY 2011;)

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