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The formation of proximal and distal definitive endoderm populations in culture requires p38 MAPK activity.

Authors
  • Yap, Charlotte
  • Goh, Hwee Ngee
  • Familari, Mary
  • Rathjen, Peter David
  • Rathjen, Joy
Type
Published Article
Journal
Journal of Cell Science
Publisher
The Company of Biologists
Publication Date
May 15, 2014
Volume
127
Issue
Pt 10
Pages
2204–2216
Identifiers
DOI: 10.1242/jcs.134502
PMID: 24481813
Source
Medline
Keywords
License
Unknown

Abstract

Endoderm formation in the mammal is a complex process with two lineages forming during the first weeks of development, the primitive (or extraembryonic) endoderm, which is specified in the blastocyst, and the definitive endoderm that forms later, at gastrulation, as one of the germ layers of the embryo proper. Fate mapping evidence suggests that the definitive endoderm arises as two waves, which potentially reflect two distinct cell populations. Early primitive ectoderm-like (EPL) cell differentiation has been used successfully to identify and characterise mechanisms regulating molecular gastrulation and lineage choice during differentiation. The roles of the p38 MAPK family in the formation of definitive endoderm were investigated using EPL cells and chemical inhibitors of p38 MAPK activity. These approaches define a role for p38 MAPK activity in the formation of the primitive streak and a second role in the formation of the definitive endoderm. Characterisation of the definitive endoderm populations formed from EPL cells demonstrates the formation of two distinct populations, defined by gene expression and ontogeny, that were analogous to the proximal and distal definitive endoderm populations of the embryo. Formation of the proximal definitive endoderm was found to require p38 MAPK activity and is correlated with molecular gastrulation, defined by the expression of brachyury (T). Distal definitive endoderm formation also requires p38 MAPK activity but can form when T expression is inhibited. Understanding lineage complexity will be a prerequisite for the generation of endoderm derivatives for commercial and clinical use.

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