Published online by Cambridge University Press: 08 August 2009
Introduction
The intrauterine environment is the first to which the conceptus is exposed and it is strongly influenced by the mother's health. In this chapter we will focus on the development of the endocrine pancreas. A disturbed intrauterine metabolic milieu would contribute to inappropriate β-cell ontogeny, resulting in a population of β cells that does not adequately cope with metabolic or oxidative stress later in life. This hypothesis obviously cannot be verified in humans; therefore various animal models have been established.
Development of the endocrine pancreas in the rodent
The development of the pancreas in rodents shows similarities to that in humans. However, while fetal β cells are functioning as true endocrine cells at the end of the first trimester in humans (Piper et al. 2004), this occurs only during the last third of gestation in the rat. The development of the pancreas is a fascinating event, starting from a pool of common progenitor cells (multipotent endodermal progenitors) which will be committed into the endocrine or exocrine cell lineages or become duct cells. Then, within the endocrine compartment, the cells will have to further differentiate into α, β, δ or PP cells producing glucagon, insulin, somatostatin or the pancreatic polypeptide respectively. This is regulated by the expression of distinct genes, under the control of a hierarchy of various specific networks of transcription factors.
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