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Contribution of the Lymphotoxin Receptor to Liver Regeneration¹

Robert A. Anders^*, Sumit K. Subudhi, Jing Wang, Klaus Pfeffer and Yang-Xin Fu^2,*

^* Department of Pathology and Committee on Immunology, University of Chicago, Chicago, IL 60637; and Institut fur Medizinische Mikrobiologie, Heinrich-Heine-Universit, Dusseldorf, Germany

The liver has an enormous capacity to regenerate in response to insults, but the cellular events and molecules involved in liver regeneration are not well defined. In this study, we report that ligands expressed on the surface of lymphocytes have a substantial effect on liver homeostasis. We demonstrate that a T cell-restricted ligand, homologous to lymphotoxin, exhibits inducible expression, competes with herpesvirus glycoprotein D for herpesvirus entry mediator on T cells (LIGHT), signaling through the lymphotoxin receptor (LTR) expressed on mature hepatocytes induces massive hepatomegaly. Using genetic targeting and a receptor fusion protein, we further show that mice deficient in LTR signaling have a severe defect in their ability to survive partial hepatectomy with marked liver damage and failure to initiate DNA synthesis after partial hepatectomy. We further show that mice deficient in a LTR ligand, LT, also show decreased ability to survive partial hepatectomy with similar levels of liver damage and decreased DNA synthesis. Therefore, our study has revealed an unexpected role of lymphocyte-restricted ligands and defined a new pathway in supporting liver regeneration.

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