The function of hepatocytes largely depends on their position in the liver lobule. Although the method of differentiating hepatocytes from human pluripotent stem cells has been largely improved over the past decade, there remains no technique for generating hepatocyte-like cells (HLCs) with zone-specific hepatic properties. In this study, we searched for the factors that promote acquisition of zone-specific properties of HLCs. Here, we identified that WNT7B and WNT8B secreted from hepatocytes and cholangiocytes play important roles in achieving perivenous zone-specific characteristics, such as the enhancement of glutamine secretion, citric acid cycle, cytochrome P450 (CYP) 1A2 metabolism, and CYP1A2 induction capacities. We also found that WNT inhibitory factor (WIF-1) secreted from cholangiocytes was necessary for achieving periportal zone-specific characteristics, such as the enhancement of urea secretion and gluconeogenesis capacities. Therefore, WNT signal modulators secreted from hepatocytes or cholangiocytes conferred zone-specific hepatic properties onto HLCs.
Keywords: WIF-1; WNT7B; WNT8B; adenovirus vector; differentiation; drug metabolizing enzyme; hepatocytes; human ES cells; human iPS cells; liver zonation.
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