Development of the endocrine cells in the rat pancreatic and bile duct system |
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Authors: | In-Sun Park and Mo?se Bendayan |
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Institution: | (1) Department of Anatomy, Université de Montréal, CP6128, succ. ‘A’, H3C 3J7 Montréal, Québec, Canada |
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Abstract: | Summary Morphological features of the endocrine cells in the duct system of the pancreas and the biliary tract have been recently
characterized in the adult animal with respect to their physiological roles. In the present study, we have investigated their
chronological appearance as well as their developmental progress at various stages of the rat fetal and postnatal life. On
day 12 of gestation, glucagon and insulin, as well as CCK cells, were identified in the pancreatic primordium. On day 14,
glucagon and CCK cells were first detected in the epithelial lining of the common hepatic and the hepatic ducts. These cells
remained the dominant endocrine type in the duct system during the fetal period. Insulin and pancreatic polypeptide cells
were first observed in the common hepatic duct only on days 16 and 18 of gestation respectively. In spite of their presence
in the islets, somatostatin cells were not detected in the duct system during fetal life. They started to appear in the accessory
pancreatic duct of the neonate, and subsequently in the common hepatic duct as well as in the small pancreatic ones on day
7 after birth. During postnatal development, the endocrine cells showed progressive or retrogressive changes in different
portions of the duct system according to the cell type. In general, somatostatin, CCK and pancreatic polypeptide cells showed
an increase, while glucagon and insulin cells gradually dwindled in number up to the adult stage. Somatostatin cells exhibited
a significant increase in number, becoming the highest population among the duct endocrine cells in the adult. Throughout
the developmental progress, the endocrine cells appear to be allocated in regions relevant to their possible influence modulating
the exocrine secretion as well as the drainage of the pancreatic and bile fluid.
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