Ontogeny of endocrine cells in the gut of the insect Periplaneta americana |
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Authors: | Dr. Yasuhisa Endo |
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Affiliation: | (1) Shionogi Research Laboratories, Shionogi & Co., Ltd., Osaka, Japan;(2) Shionogi Research Laboratories, Shionogi & Co., Ltd., Fukushima-ku, 553 Osaka, Japan |
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Abstract: | Summary The ontogeny of the endocrine cells of the gut of the cockroach Periplaneta americana was studied by immunohistochemistry. During embryogenesis, the midgut begins to be formed as an outgrowth of the foregut and hindgut invaginations. Gut endocrine cells with pancreatic polypeptide (PP)-like immunoreactivity begin to appear at the anterior and posterior ends of the forming midgut. These cells are restricted to the midgut epithelium, and no mitotic cells with PP-like immunoreactivity are observed. These results strongly suggest that the gut endocrine cells, at least those with PP-like immunoreactivity, are derived from precursor cells they have in common with other epithelial cells of the midgut. |
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Keywords: | Gut endocrine cells Ontogeny Immunohistochemistry Pancreatic polypeptide Insect |
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