Mucus-associated antigen in epithelial cells of the chicken digestive tract: Developmental change in expression and implications for morphogenesis-function relationships

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Abstract
The embryonic chicken digestive tract consists of endodermal epithelium and mesenchyme derived from splanchnic mesoderm. Interactions between these two tissues are important for the establishment of regionality and the subsequent differentiation of digestive organs. In the present study we obtained a monoclonal antibody that reacted with mucus‐associated antigen and named it the MA antibody. From 6 days of incubation, this antibody reacted with the esophageal, proventricular and gizzard epithelia. In the proventriculus, the MA antigen was expressed in luminal epithelial cells, while pepsinogen‐producing gland cells became MA antigen‐negative. The intestinal goblet cells, which secrete mucus, became positive to the antibody from day 13 of incubation. When the esophageal, proventricular or gizzard epithelium of a 6 day embryo was associated and cultivated with the proventricular mesenchyme, the luminal epithelial cells remained reactive to the MA antibody while gland cells were negative or only weakly positive. If the small‐intestinal epithelium was cultivated with the proventricular or gizzard mesenchyme, the antigen was detected on the apical surface of the epithelium, suggesting that the expression of the MA antigen was induced by mesenchymal influences in the small‐intestinal epithelium. These results suggest that spatio‐temporally regulated expression of the MA antigen is controlled by the epithelial‐mesenchymal interactions.

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