Identification of sugar residues in secretory glycoconjugates of the lining and glandular epithelium of the chick embryo gizzard using lectin histochemistry.
Using seven horseradish peroxidase-conjugated lectins we studied the distribution of glycoconjugate sugar residues in the lining and glandular epithelium of the gizzard in chick embryos from day 7 to 21 of incubation. At the outer layer of the lining epithelium all investigated sugar residues were present from day 7 onwards, except alpha-L-fucose, which was detected later. From day 9 some cells, which contained granules characterised by D-galactose-(beta 1--->3)-N-acetyl-D-galactosamine and N-acetyl-D-glucosamine, were observed in the inner part of the lining epithelium. Afterwards, although in different time periods, all investigated oligosaccharides were detected in intercellular spaces filled with mucous material. At first, the cells of the anlage of the tubular glands appeared to be characterised by D-glucosamine and alpha-D-mannose only. Afterwards, all the investigated sugar residues were detected. At hatching, the luminal glandular secretion showed all investigated sugar residues, except alpha-L-fucose, which was typical for the early formation of the tubular glands. Our data suggest that during the development of the gizzard three time periods of mucous release can be distinguished.
Gheri
G
G
Department of Human Anatomy and Histology, University of Florence, Policlinico di Careggi, Italy.
Bryk
S G
SG
Sgambati
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E
D000818:Animals; D050260:Carbohydrate Metabolism; D002240:Carbohydrate Sequence; D002241:Carbohydrates / Q000032:analysis / Q000737:chemistry; D002642:Chick Embryo; D004847:Epithelial Cells; D004848:Epithelium / Q000378:metabolism; D005895:Gizzard, Avian / Q000196:embryology / Q000378:metabolism*; D006001:Glycoconjugates / Q000737:chemistry / Q000378:metabolism*; D006651:Histocytochemistry; D006735:Horseradish Peroxidase / Q000737:chemistry / Q000378:metabolism; D037102:Lectins / Q000737:chemistry* / Q000378:metabolism; D008969:Molecular Sequence Data
D002241:Carbohydrates; D006001:Glycoconjugates; D037102:Lectins; D006735:Horseradish Peroxidase