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Small‐for‐size syndrome (SFSS) is a common complication following partial liver transplantation and extended hepatectomy. SFSS is characterized by postoperative liver dysfunction caused by insufficient regenerative capacity and portal hyperperfusion and is more frequent in patients with preexisting liver disease. We explored the effect of the Mesenchymal‐epithelial transition factor (MET)‐agonistic antibody 71D6 on liver regeneration and functional recovery in a mouse model of SFSS. Male C57/BL6 mice were exposed to repeated carbon tetrachloride injections for 10 weeks and then randomized into 2 arms receiving 3 mg/kg 71D6 or a control immunoglobulin G (IgG). At 2 days after the randomization, the mice were subjected to 70% hepatectomy. Mouse survival was recorded up to 28 days after hepatectomy. Satellite animals were euthanized at different time points to analyze liver regeneration, fibrosis, and inflammation. Serum 71D6 administration significantly decreased mouse mortality consequent to insufficient regeneration of the cirrhotic liver. Analysis of liver specimens in satellite animals revealed that 71D6 promoted powerful activation of the extracellular signal‐regulated kinase pathway and accelerated liver regeneration, characterized by increased liver‐to‐body weight, augmented mitotic index, and higher serum albumin levels. Moreover, 71D6 accelerated the resolution of hepatic fibrosis as measured by picrosirius red, desmin, and α–smooth muscle actin staining, and suppressed liver infiltration by macrophages as measured by CD68 and F4/80 staining. Analysis of gene expression by reverse‐transcription polymerase chain reaction confirmed that 71D6 administration suppressed the expression of key profibrotic genes, including platelet‐derived growth factor, tissue inhibitor of metalloproteinase 3, and transforming growth factor‐β1, and of key proinflammatory genes, including tumor necrosis factor‐α, interleukin‐1β, chemokine (C‐C motif) ligand 3, and chemokine (C‐C motif) ligand 5. These results suggest that activating the MET pathway via an hepatocyte growth factor–mimetic antibody may be beneficial in patients with SFSS and possibly other types of acute and chronic liver disorders.

liver transplantation

A Mesenchymal‐Epithelial Transition Factor‐Agonistic Antibody Accelerates Cirrhotic Liver Regeneration and Improves Mouse Survival Following Partial Hepatectomy