Ontogeny, distribution and amine/peptide colocalization of chromogranin A- and B-immunoreactive cells in the chicken gizzard and antrum.
The ontogeny and the distribution of chromogranin A (CgA)- and chromogranin B (CgB)-immunoreactive endocrine cells was studied in the chicken gizzard and gizzard-duodenal junction (also called pylorus or antrum) during embryonic and postnatal life. The same tissue sections were then double-immunostained to identify the CgA-and CgB-immunoreactive cells, with a panel of polyclonal antibodies raised against main gut amine/peptides. In the gizzard, positive cells were observed only in its two diverticula (proximal and distal caeca), where the first CgA- and CgB-immunoreactive cells were found on day 12 of incubation. They always remained moderate in number and co-stored mainly serotonin, gastrin/CCK and neurotensin. A few also co-stored somatostatin, but only during the embryonic period. Others co-stored PYY, but only after hatching. Co-localization with motilin was rare and never occurred with bombesin. In the chicken antrum, the first CgA- and CgB-immunoreactive cells were observed on day 12 of incubation and soon reached very high numbers. Antral positive cells showed almost the same co-localization pattern as the gizzard diverticula. Despite their high chromogranin content, the antral cells had weak argyrophilia, whereas in the gizzard diverticula the two staining patterns corresponded.
Salvi
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E
Institute of Human Anatomy, University La Sapienza, Rome, Italy.
Buffa
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R
Renda
T G
TG
D000588:Amines / Q000276:immunology; D000818:Animals; D000918:Antibody Specificity; D002642:Chick Embryo; D002645:Chickens / Q000033:anatomy & histology*; D053379:Chromogranin A; D002864:Chromogranins / Q000032:analysis* / Q000276:immunology; D003594:Cytoplasmic Granules / Q000737:chemistry*; D005895:Gizzard, Avian / Q000737:chemistry* / Q000166:cytology; D007150:Immunohistochemistry; D010455:Peptides / Q000276:immunology; D011706:Pyloric Antrum / Q000737:chemistry* / Q000166:cytology; D016622:Silver Staining
D000588:Amines; D053379:Chromogranin A; D002864:Chromogranins; D010455:Peptides