from Section I - Pathophysiology of pediatric liver disease
Published online by Cambridge University Press: 05 March 2014
Introduction
Liver development requires two linked processes: differentiation of the various hepatic cell types from their embryonic progenitors and the arrangement of those cells into structures that permit the distinctive circulatory, metabolic, and excretory functions of the liver.
Primarily through the use of rodent, fish, and frog model systems, many essential regulators of liver development have been identified. These include extracellular signaling molecules, intracellular signal transduction pathways, and transcription factors. In recent years, transcriptional regulation by microRNA has also been implicated in liver development. In addition, a class of biliary diseases associated with defects in the cholangiocyte cilium has highlighted the importance of this structure in bile duct morphology and cellular polarity.
This chapter describes the stages of liver development in conjunction with their associated molecular pathways. Whenever relevant, links to pediatric liver disease will be indicated. One important insight that has emerged from the study of liver development is that the process is not complete at birth, because bile duct remodeling is ongoing (see below). In addition, it has become clear that many of the molecular pathways that direct liver development are reactivated during the course of liver regeneration. Therefore insights derived from the embryonic and fetal liver may be relevant in the context of liver injury at any age.
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