Summary
A method utilizing microinjection of glycosaminoglycan-degrading enzymes in the chicken blastoderm prior to embryo culture and immunostaining for fibronectin have been applied to demonstrate an interaction between glycosaminoglycans and fibronectin in the basement membrane of the epiblast. Fixation of tissue in a mixture of formaldehyde and cetylpyridinium chloride allows detection of fibronectin only in those zones of the embryo that are not colonized by mesoblast cells. The epithelial-mesenchymal interface thus remains unstained. After degradation of glycosaminoglycans in the living organism, it is shown that this particular site, in fact, also contains fibronectin that is masked in vivo by, at least, hyaluronate. This interaction between both compounds is, during gastrulation, constantly correlated with mesoblast migration. Since previous studies have shown that the degradation of hyaluronate determines the behaviour of mesoblast cells, it is proposed that remodelling of the interaction between these compounds is necessary for mesoblast migration to occur.
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Harrisson, F., Van Hoof, J. & Foidart, J.M. Demonstration of the interaction between glycosaminoglycans and fibronectin in the basement membrane of the living chicken embryo. Wilhelm Roux' Archiv 193, 418–421 (1984). https://doi.org/10.1007/BF00848234
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DOI: https://doi.org/10.1007/BF00848234