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Intercellular Contacts Between the Embryonic or Extraembryonic Ectoderm and the Primitive Endoderm in Rat Egg Cylinders Prior to the Formation of Primitive Streak
Author(s) -
TAKEUCHI IKUO K.,
TAKEUCHI YOSHIKO K.
Publication year - 1981
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.1981.00157.x
Subject(s) - ectoderm , primitive streak , endoderm , microbiology and biotechnology , embryonic stem cell , biology , microfilament , anatomy , cell junction , cytoplasm , gastrulation , embryogenesis , embryo , cell , cytoskeleton , biochemistry , gene , genetics
In pre‐primitive streak‐stage rat egg cylinders, both the embryonic and extraembryonic ectodermal cells projected cytoplasmic protrusions through gaps in the basal lamina and formed intimate cell‐to‐cell contact with the primitive endodermal cells. The 70 Å microfilaments were considered to participate in the production of these cytoplasmic protrusions. However, direct cell contact mediated by adherent junctions was occasionally found between the embryonic or extraembryonic ectodermal cells and the primitive endodermal cells. It has been proposed that these cell‐to‐cell contacts may play a role either in the supporting effect of primitive endodermal cells in the maintenance of cellular organization of the ectodermal cells, or in the facilitation of transport of nutritive materials from the primitive endodermal cells to both types of ectodermal cells.