ABSTRACT. The pancreata of four six-month-old dogs of the same mother, two with both the pancreatic and accessory pancreatic ducts (Xtype) and two with only the accessory pancreatic duct (Y-type), were examined in this study. To clarify the relationships between the type of pancreatic duct system and the composition of pancreatic endocrine cells, the pancreata were examined immunohistochemically using antiserum against four types of pancreatic hormones (glucagon, insulin, somatostatin and pancreatic polypeptide). In all areas of the Xand Y-type duct system pancreata, B cells accounted for 52-82% of the total number of islet cells, and D cells accounted for 4-15%. In the X-type ducts system, the percentages of A and PP cells in the right and left lobes of the pancreas differed greatly. It was found that A and PP cells appear in inverse proportion to each other and that there exist A cell-rich and PP cell-rich pancreatic islets. The A cell-rich pancreatic islets appeared in the left lobes along the accessory pancreatic duct, while the PP cell-rich pancreatic islets were observed in the right lobes along the pancreatic duct. The body of the pancreas contained both A cell-rich and PP cell-rich pancreatic islets. In the Y-type duct systems, A cell-rich pancreatic islets appeared in the right lobes. These findings indicate that the composition of A and PP cells in pancreatic islets is closely related to the type of duct system.-KEY WORDS: canine, cell composition, duct system, immunohistochemistry, pancreatic islet.
The morphology of the gland cells in the glandular sac area of the Bactrian camel and the composition of secretory substances were examined by histochemical methods. It was found that the gland cells of the glandular sac area were of the same type and size as those of the cardiac glands. The composition of secretory substances from the glandular sac area was the same as that of secretory substances from the cardiac glands. Moreover, secretory substances from the gland cells of the glandular sac area contained a great deal of acid glycoconjugates, such as sialic acid, in addition to neutral saccharides (fucose, mannose, glucose, N-acetyl-D-glucosamin, galactose and N-acetyl-galactosamin). Furthermore, immunohistochemical examination showed that progastricsin was present in the gland cells of the glandular sac area and the cardiac gland. In this study, histological analysis suggested that the stomach of the Bactrian camel is a single cavity stomach, formed as a result of multiple differentiation and growth of cardiac glands through the process of evolution.
Light and electron microscopic studies were conducted on dermis samples taken from different regions of adult cows and pigs to determine whether there is a correlation between subfibrillar architecture and collagen fibril diameter in dermis tissue. Dermis thicknesses, collagen fibril diameters, subfibrillar architecture diameters, and angles of the helical arrangement of subfibrillar architectures were measured in all dermis samples. The results showed that the differences between subfibrillar architecture diameters in dermis samples from different regions of the same species were not significant and that the diameters of subfibrillar architectures in dermis samples were similar (22-28 nm) in the two species (cow and pig) examined in this study. These findings therefore suggest that the collagen fibril diameter depends on the number of subfibrillar architectures in each fibril.
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