J. Czyz et al., Anchorage-dependent chick embryo fibroblasts synthesise DNA and proliferate when cultured in multilayered sheets suspended among glass fibres, FOL BIOLOG, 49(1-2), 2001, pp. 1-12
Chick embryo fibroblasts (CEFs) spontaneously form multicellular and multil
ayered sheets suspended on the network of glass fibres which are stabilized
by fibronectin containing protein deposits located at cell-to-cell contact
s. The cells situated within the sheets are surrounded by the neighbouring
cells and their mechanical equilibrium is stabilised by intercellular "para
baric" effects. It was found that CEFs in the sheets retain relatively high
mitotic activity corresponding to that observed in sparse monolayer cultur
es. These cells grew up to much higher local density than in confluent and
contact-inhibited monolayer cultures and developed an abundance of microfil
ament bundles that terminated at vinculin-containing protein complexes. The
results presented demonstrate that direct contact with solid substratum, c
ell-to-cell contacts, local cell density, and intercellular exchange of hum
oral factors are not directly involved in the density-dependent inhibition
of growth observed in monolayer cultures. They also support the concepts co
ncerning the role of mechanical equilibrium of cell membrane and sub-membra
nous cytoskeleton in the regulation of proliferation of non-transformed cel
ls.