By J. M. Foidart, A. Noel, H. Emonard, B. Nusgens, Ch. M. Lapiere (auth.), Alain O. A. Miller (eds.)

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Warner, A. , Guthrie, S. C. and Gllula, N. ) Zimmer, D. , Green, C. , Evans, W. H. and Gllula, N. : Topological analysis of the major protein in isolated intact rat liver gap junctions and gap junction-derived single membrane structures J. BioI. Chem. F. Preat Role played by gap junctions in cell-cell communication Did you study the effects of tumour promoter on your culture system Hulser Tumour promoters have been studied because they with the diacylglycerol signal interact pathway and therefore you always get a downregulation of the permeability.

Actually, this might be the case for most of its interactions with cells, as fibronectin adsorbed to plastic coats or beads, or fibronectin added together with heparin, heparan sulfate or collagen is much more 43 effective in binding to cells than fibronectin in solution (Johansson and Hook, 1984). A particular successful approach used to unravel the structure-function relationships in the fibronectin molecule has been to cleave the molecule in functional domains by limited proteolysis and to isolate the fragments by affinity chromatography on different ligands, This approach localized specific binding interactions of fibronectin to precise regions in the molecule.

Whereas in the first two cases the signal flow is unidirectional (hormone, neurotransmitter; sperm-egg-binding, immune system), in the latter case no rectification is observed. These cell to cell channels - called gap junctions - not only allow an intercellular pathway for the transfer of information between cells but also connect adjacent cells mechanically. They must, therefore, well be discriminated from desmosomes which anchor cells together to form structural or functional units as well as from tight junctions which seal membranes of epithelial cells to each other so that the paracellular path becomes impermeable to molecules and a polarity of apical and basolateral surface is maintained.

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