Behaviour of dissociated hypoblast cells on the basal lamina and on extracellular fibrils in the gastrulating chicken embryo.

Abstract:

:The spreading behaviour of dissociated hypoblast cells on and besides a band of aligned fibrils associated with the basal lamina of the epiblast was investigated by the use of scanning electron microscopy. A horse-shaped band of aligned fibrils, first demonstrated by Wakely and England (1979), is present during the gastrulation stages of chicken embryos on the ventral side of the epiblast at the cranial and lateral borders of the area pellucida. The basal lamina of the area pellucida situated inside the fibrillar band enables the spreading and probably the locomotion of dissociated cells, which appeared as polarized cells. Numerous cells were also found on the fibrillar band, and these cells lacked distinct lamellae and a polarized shape. Extensions of the cells contacted the extracellular fibrils and, at these sites of contact, the pattern of the fibrils was frequently deformed. From these observations and from previous results emerged the concept that spreading and locomotion of dissociated hypoblast cells, as well as single mesoblast cells and healing hypoblast epithelium, are inhibited by the band of extracellular fibrils, which acts as a physical barrier. The cell biological basis of the mechanism by which extracellular fibrils associated with the basal lamina arrest the migration of hypoblast and mesoblast cells, but guide the migration of primordial germ cells, is discussed.

journal_name

Cell Biol Int

authors

Andries L,Harrisson F,Vakaet L

doi

10.1006/cbir.1994.1102

subject

Has Abstract

pub_date

1994-07-01 00:00:00

pages

729-36

issue

7

eissn

1065-6995

issn

1095-8355

pii

S1065-6995(84)71102-4

journal_volume

18

pub_type

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