Control of Hepatic Differentiation by Activin/TGFβ Signaling

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Abstract
During liver development, liver progenitors called hepatoblasts differentiate into hepatocytes or biliary cells. Recently, we showed that the segregation between hepatocytes and biliary cells is dependent on a gradient of Activin/TGFβ signaling, and that Activin/TGFβ signaling is controlled in fetal liver by transcription factors of the Onecut family. Here, we discuss candidate factors possibly involved in the formation of the Activin/TGFβ signaling gradient, how this gradient could integrate into a network of signaling pathways modulating hepatoblast differentiation, and the implications for human liver disease and therapy.

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