Abstract
We performed tissue recombination experiments to discover the mesenchymal influences on differentiation of epithelia in chicken digestive organs. Epithelia and mesenchymes were taken from the lung, esophagus, proventriculus, gizzard, small intestine and large intestine of 6-day chicken embryos and recombined in various associations and cultivated in vitro for 6 days. Rather unexpectedly, embryonic chicken pepsinogen (ECPg) gene, a marker of the proventricular epithelium, was induced in the gizzard epithelium, which does not express ECPg in normal development, by the proventricular and lung mesenchymes. In the second half of this study, we investigated the mode of action of mesenchymal cells on ECPg expression in gizzard epithelial cells more precisely using the cell aggregate culture system, in which gizzard epithelial cells were mixed with proventricular, gizzard or lung mesenchymal cells. We found that supporting action of lung mesenchymal cells on ECPg expression was even stronger than that of proventricular mesenchymal cells, and suggest that the action of lung mesenchyme may be due partly to the enhancement of epithelial cell proliferation. According to the results of this study, together with many facts obtained so far, we will discuss a new model for restricted expression of ECPg in the proventricular epithelium in normal development.
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Urase, K., Fukuda, K., Ishii, Y. et al. Analysis of mesenchymal influence on the pepsinogen gene expression in the epithelium of chicken embryonic digestive tract. Roux's Arch Dev Biol 205, 382–390 (1996). https://doi.org/10.1007/BF00377218
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DOI: https://doi.org/10.1007/BF00377218