Abstract
This is the first report on the existence in Drosophila of a protein with properties similar to those of vertebrate fibronectin that we shall refer to as Drosophila fibronectin. Rabbit antibodies against human plasma fibronectin have allowed the detection of this molecule in Drosophila haemolymph; common epitopes are shared by the two proteins. Drosophila fibronectin with a subunit mol. wt of approximately 230 kd is a glycoprotein which binds to denatured mammalian collagen. It is present throughout development and is as abundant in embryos as in larvae and adult flies. Drosophila fibronectin is differentially expressed during embryogenesis, a small amount being present before the blastoderm stage. Its concentration increases at gastrulation and reaches a steady-state value at the end of organogenesis. Drosophila fibronectin is predominantly detected by immunofluorescence on frozen sections of 16 h embryos in the extracellular spaces lying between the different tissues and organs. In mature third instar larvae, most of the staining is concentrated in fat body and imaginal discs, and the pattern strongly supports an extracellular localization of the protein. In addition, it is shown that Drosophila embryonic cells can functionally utilize vertebrate fibronectin for their spreading and differentiation. Finally, injection of antihuman plasma fibronectin antibodies in early embryos leads to the same phenotype as injection of Arg-Gly-Asp-containing peptides. This result suggests that one of the Arg-Gly-Asp-bearing protein(s) involved in gastrulation might be fibronectin.
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