The transcription factor sex-determining region Y-box 9 (SOX9) is a biliary epithelial marker ectopically expressed in hepatocytes (SOX9 + hepatocytes). SOX9 + hepatocytes are believed to function in ductular reaction (DR), recognized as an essential phenomenon related to liver regeneration; however, the functional role of SOX9 and clinical implications of SOX9 + hepatocytes in DR progression are unclear. Human and mouse liver samples were subjected to immunohistochemical and gene functional analyses to investigate the functional role of SOX9 and the clinical significance of SOX9 + hepatocytes. SOX9 + hepatocytes were observed in a bile duct ligation (BDL) mouse model. Forced Sox9 expression in mouse hepatocytes by hydrodynamic injection converted them into cholangiocyte-like cells. DR progression was slower in liver epithelium-specific Sox9-knockout BDL mice than in wild-type BDL mice. SOX9 + hepatocytes were also observed in rare pediatric liver disease biliary atresia (BA). In patients with BA who underwent liver transplantation (LT), the median number of SOX9 + hepatocytes at LT was significantly lower than that at Kasai portoenterostomy (KP) performed prior to LT (P < 0.001). The high SOX9 + hepatocyte group at KP demonstrated significantly better native liver survival rates than the low SOX9 + hepatocyte group at a cut-off of 390 cells/mm (P = 0.019, log-rank test). Ectopic expression of SOX9 in hepatocytes of chronically injured livers may exert protective effects in DR progression. To our knowledge, this is the first study showing that SOX9 + hepatocyte count at KP can be a promising biomarker to predict native liver survival after KP in patients with BA.
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