Browsing by Subject "Endocrine cells"

Now showing 1 - 6 of 6
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    An immunohistochemical study on the distribution of endocrine cells in the gastrointestinal tract of the musk shrew, Suncus murinus
    (Murcia : F. Hernández, 1990) Nobuo Kitamura; Junzo Yamada; Tohru Watanabe; Tadayuki Yamashita
    The endocrine cells in the gastrointestinal tract of the musk shrew were studied immunohistochemically. Eleven kinds of endocrine cells, immunoreactive for serotonin, somatostatin, gastrin, cholecistokinin, gastric inhibitory polypeptide, motilin, secretin, neurotensin, pancreatic glucagon, enteroglucagon and bovine pancreatic polypeptide, were revealed. In the stomach, serotonin-, somatostatin-, gastrin-, pancreatic glucagon- and enteroglucagon-immunoreactive cells were detected. The first three types of cells predominated and were more abundant in the pyloric glands than in the other stomach regions. In the small intestine, al1 types of endocrine cells were found, each having different distributions and relative frequencies. In the large intestine, 10 types of endocrine cells except cholecystokininimmunoreactive cells were detected. Serotonin- and bovine pancreatic polypeptide-immunoreactive cells were more numerous in the large intestine than in the small intestine.
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    Distribution of serotonin-immunoreactive cells in the mouse pancreas during development
    (Murcia : F. Hernández, 1990) Rodríguez Sánchez, F.; Casar, J.; De Castro, J.M.; Del Águila, F.
    The distribution and time of appearance of 5HT-storing cells were studied in samples from the pancreas of mice embryos from 7 to 19 days of gestation. Additonally, 1- and 15-day-old newborns and adult specimens were also examined. Serotonin-immunoreactive cells appeared for the fist time in the dorsal pancreatic primordium at 10 days of gestation and increased rapidly in number through E15. From this age, the cellular number disminished in the exocrine pancreatic parenchyma, although an increase of endocrine cells in Wirsung's duct can be detected. At day 15 of extrauterine life, we could only observe some cells in the surface epithelium of pancreatic duct of Wirsung. Islet immunoreactive cells could only be detected in adult animals.
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    Effects of unilateral cervical vagotomy on antral endocrine cells in mouse
    (Murcia : F. Hernández, 1999) Qian, B.F.; El-Salhy, M.; Danielsson, A.; Shalaby, A.; Axelsson, H.
    The present study was carried out to investigate the effect of unilateral cervical vagotomy on the antral endocrine cells in mouse. Fifty-four mice were randomly divided into three groups, 18 in each, for left or right cervical vagotomy, or sham operation as controls. The animals were sacrificed 2, 4, and 8 weeks after the operation, respectively. Chromogranin-, gastrin/CCK-, serotonin-, and somatostatin-cells were detected by immunohistochemistry and quantitated by computerised image analysis. The results showed that the number of chromogranin-cells was decreased in both left and right vagotomized mice after 4 weeks and remained at the same level after 8 weeks. The numbers of gastrin-, serotonin- and somatostatin-cells did not change after right vagotomy. However, the numbers of gastrin- and somatostatin-cells were decreased after left vagotomy, whereas no change was found in serotonincells. Endocrine cells with vacuolated cytoplasm and pyknotic nuclei were also observed during the course of time. The alteration in the antral endocrine cells observed in this study seemed to be dynamic and depended on the observation time after the operation as well as the denervated branches of the vagus nerve. This may explain, at least partially the contradictory results obtained earlier by different investigators.
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    Endocrine cells of the gastric mucosa of Rana temporaria L.
    (Murcia : F. Hernández, 1987) Díaz de Rada, O.; Sesma, P.; Vazquez, J.J.
    The endocrine cells of the gastric mucosa of Rana temporaria have been studied according to the ultrastructure, the staining properties of the granules with Masson Fontana's and Grimelius' silver methods, silver impregnation of Davenport on deplasticised semithin sections and immunocytochemical techniques. Seven different types of endocrine cells have been described. Six were regarded as belonging to known types: G, A, EC, ECL, D and P cells. One type was considered as unclassifiable.
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    Gastric and intestinal phenotypic correlation between exocrine and endocrine components in human stomach tumors
    (Murcia : F. Hernández, 2007) Takenaka, Y.; Tsukamoto, T.; Mizoshita, T.; Ogasawara, N.; Hirano, N.; Otsuka, T.; Ban, H.; Nakamura, T.; Yamamura, Y.; Kaminishi, M.; Tatematsu, M.
    We have previously suggested that an origin of a stomach cancer is from a progenitor cell specializing toward exocrine cell (Exo-cell) lineages. To clarify whether our hypothesis is correct or not, we analyzed the expression of Exo-cell and endocrine cell (End-cell) markers in a series of lesions for comparison. We evaluated chromogranin A (CgA) expression in 37 early and 73 advanced stomach cancers, in 30 stomach adenomas, in 8 carcinoid tumors, and in 4 endocrine cell carcinomas (ECCs) with assessment of gastric and/or intestinal (G/I) phenotypes in both Exo-cell and End-cell by immunohistochemistry. CgA expression was observed in 10.8% of the early and 16.4% of the advanced stomach cancers, respectively. The End-cell G/I phenotypes were in line with the Exo-cell counterparts in the CgA-positive stomach cancerous areas, and there was strong association between Cdx2 expression and the intestinal End-cell markers. All of the adenoma cases had the intestinal Exo-cell phenotypic expression, with the positive link between Exo-cell and End-cell G/I phenotypes. All stomach carcinoids had CgA expression but no expression of Exo-cell markers. In conclusion, most stomach cancers might develop from a progenitor cell specializing towards Exo-cell lineages, but some cases possessed both Exo-cell and End-cell markers with maturely differentiated phenotypes. In such cases, Exo-cell and End-cell phenotypes were found to correlate strongly, suggesting the possibility of histogenesis from “cancer stem cells”.
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    Immunolocalization of regulatory peptides and 5-HT in bovine male urogenital apparatus
    (Murcia : F. Hernández, 1998) Arrighi, S.; Domeneghini, C.
    Specimens of testis, excurrent duct including the accessory genital glands and urethra throughout its extension were investigated in adult bovines, in order to imm~~nohistochemicalllyo calize both the peptidergic innervation and the epithelial cell types belonging to [he diffuse endocrine system (DES). Immunoreactivities to GRP, met- and leu-enkephalins, CGRP, NPY, substance P, VIP, somatostatin, l3-endorphin and 5-HT antisera were tested by means of a labelled streptavidin-biotin (LSAB) method. Such regulatory substances were found in components of the peripheral nervous system (nerve fibers in the connective and muscular tissues, sub- and intraepithelial nerve terminals, nerve cell bodies and fibers in intramural ganglia), and in epithelia1 endocrine/ paracrine cells. Bovine urogenital apparatus is supplied by many peptide-containing nerves, which contain in many localizations GRP and enkephalins, and to a lesser extent substance P, CGRP, NPY and VIP. A thin network of peptidergic nerves distributes to the musculature of the canalicular organs and accessory glands. The prostatic complex was especially rich in peptidergic innervation, and also contained somatostatin- and 5-HTsecreting endocrine cells. In addition, 5-HT-immunoreactive endocrine cells were found in the bulbourethral gland and urethral epithelium. CGRP-ir nerves were present contacting striated muscle fibers of urethra (motor end plates). The testis was devoid of any immunoreactivity. These data are compared with those obtained in a companion study carried out the same organs in two species of Equidae (Equus caballus and Equt~sa sinus). Different patterns of immunoreactivities can be outlined in these domestic ungulates.