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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 375 (1977), S. 123-128 
    ISSN: 1432-2307
    Keywords: Esthesioneuroblastoma ; Light microscopy ; Electron microscopy ; Argyrophil reaction ; Formaldehyde-induced fluorescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of esthesioneuroblastoma was examined by histological, histochemical and electron microscopic techniques. The tumour cells showed an argyrophil reaction with the Grimelius technique and contained cytoplasmic secretory granules, but in contrast to previous reports were devoid of histochemically demonstrable biogenic amines. For routine diagnosis the argyrophil technique may be useful in differentiating this type of tumour from epidermoid carcinoma.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2307
    Keywords: Endocrine tumour ; Pancreas ; Argentaffin reaction ; Immunocytochemistry ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An endocrine pancreatic tumour that had not caused any endocrine symptoms was examined by histological, immunocytochemical and electron microscopic techniques. The majority of the tumour cells were argentaffin and contained secretory granules of the enterochromaffin cell type. Immunocytochemically a minority of tumour cells reacted to antisera against β-endorphin, met- and leu-enkephalin, gastrin, somatostatin and ACTH. The tumour was thus multihormonal, and appeared to be more closely related to the classic Carcinoid tumours of the mid-gut than to most pancreatic endocrine tumours.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 394 (1981), S. 151-160 
    ISSN: 1432-2307
    Keywords: Stomach ; Carcinoids ; Achylia ; Pernicious anaemia ; Argyrophil reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Twenty-four patients with gastric carcinoids were examined retrospectively with regard to the presence of achylia and pernicious anaemia (PA). Six patients (25%) had achylia preoperatively and half of these had an associated PA. The gastric carcinoids occurring in an achylic stomach were almost exclusively located to the corpus area and tended to be multiple. Further, the majority of cells in most of them were argyrophil (Sevier-Munger) positive, indicating that they were of the enterochromaffin-like cell type. At present, achylia with or without concomitant PA appears to be the most distinct condition associated with gastric carcinoids. The pathogenesis of these tumours which develop in an achylic stomach is discussed.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé On a obtenu la production de 3 anticorps monoclonaux IgG 2a après immunisation des souris avec des cellules dispersées provenant d'une tumeur carcinoïde de l'intestin grêle humain. Les coupes congelées, fixées à l'acétone, de 57 carcinoïdes primaires et métastatiques, ainsi que 2 tumeurs carcinoïdes rectales ont montré une réaction immune évidente, alors qu'une tumeur carcinoïde d'origine thymique restait non colorée avec les anticorps. Les 3 anticorps produisaient une coloration semblable. La réaction immune intéressait plus de 95% des cellules tumorales carcinoïdes, et était plus uniforme et plus intense dans les tumeurs primitives que dans les tumeurs métastatiques, mésentériques, hépatiques et ovariennes des tumeurs intestinales. L'étude en immunofluorescence des cellules de tumeur carcinoïde suspendues a démontré que les anticorps se fixaient à la membrane de surface de ces cellules. Les anticorps ont coloré les enérocytes du gros et du petit intestin, les cellules de la métaplasie intestinale de la muqueuse de l'estomac, et des cellules des adénocarcinomes colorectaux. Ont été également colorées les cellules des tumeurs pancréatiques endocrines produisant des polypeptides intestinaux vasoactifs, de la gastrine, de la somatostatine et/ou des polypeptides pancréatiques et de l'épithélium des canaux pancréatiques. Au contraire, la plupart des tissus humains normaux et anormaux, y compris ceux des insulinomes bénins et malins, n'ont pas réagi. Ces résultats indiquent que ces anticorps sont capables de reconnaître les antigènes de différenciation sur la surface cellulaire des tumeurs carcinoïdes qui sont préservées également sur les cellules endocrines et non endocrines de la muqueuse intestinale normale. L'activité bien définie des anticorps suggère qu'ils peuvent aider à caractériser histologiquement les tumeurs carcinoïdes. D'autres études sont nécessaires pour savoir s'ils peuvent servir à localiser ces tumeurs et peut-être même faire partie de l'arsenal thérapeutique contre ces néoplasies.
    Abstract: Resumen Se produjeron 3 anticuerpos monoclonales IgG 2a mediante la inmunización de ratones con células dispersas de un tumor carcinoide humano del intestino medio. Criosecciones fijadas con acetona de 57 tumores carcinoides del intestino medio primarios y metastásicos, y de 2 carcinoides del intestino distal (recto), demostraron conspicua inmunoreacción, en tanto que un carcinoide tímico apareció esencialmente no coloreado con los anticuerpos. Los 3 anticuerpos produjeron un patrón similar de inmunocoloración. La inmunoreacción incluyó más de 95% de las células del tumor carcinoide y fue más uniforme e intensa en los tumores primarios que en las metástasis mesentéricas, hepáticas, y ováricas de los tumores carcinoides del intestino medio. Estudios de inmunofluorescencia en células tumorales suspendidas demostraron que los anticuerpos se ligan a la membrana de superficie de las células. Los anticuerpos también inmunocolorearon enterocitos del intestino delgado y del intestino grueso, metaplasia intestinal de la mucosa estomacal, así como adenocarcinomas colorrectales. Tumores pancreáticos endocrinos productores de polipéptido vasoactivo intestinal, gastrina, somatostatina y/o polipéptido pancreático, así como el epitelio de los canales pancreáticos, también resultaron coloreados por los anticuerpos, en tanto que un gran número de otros tejidos humanos normales y anormales, incluyendo insulinomas benignos y malignos, aparecieron no reactivos. Los hallazgos indican que los anticuerpos reconocen los antígenos de diferenciación sobre la superficie de la célula tumoral carcinoide, preservados también en células endocrinas y no endocrinas de la mucosa normal del intestino. La restringida reactividad tisular de los anticuerpos sugiere que éstos pueden constituir instrumentos útiles para la diferenciación histológica de tumores carcinoides. Estudios ulteriores pueden revelar si son aplicables para inmunolocalización y aún para inmunoterapia de estos tumores.
    Notes: Abstract Three monoclonal IgG 2a antibodies were produced after immunization of mice with dispersed cells from a human mid-gut carcinoid tumor. Acetone-fixed cryosections of 57 primary and metastatic mid-gut carcinoid tumors as well as 2 hind-gut (rectal) carcinoids showed a conspicuous immunoreaction while a thymic carcinoid was essentially unstained with the antibodies. The 3 antibodies yielded a similar pattern of immunostaining. The immunoreaction comprised more than 95% of the carcinoid tumor cells, and it was more uniform and intense in primary tumors than in mesenteric, hepatic, and ovarian metastases of the mid-gut carcinoid tumors. Immunofluorescence studies on suspended carcinoid tumor cells showed that the antibodies bound to the surface membrane of the cells. The antibodies immunostained enterocytes of the small and large bowel, intestinal metaplasia of the stomach mucosa as well as colorectal adenocarcinomas. Endocrine pancreatic tumors producing vasoactive intestinal polypeptide, gastrin, somatostatin, and/or pancreatic polypeptide as well as the epithelium of pancreatic ducts were also stained with the antibodies, whereas a large number of other normal and abnormal human tissues, including benign and malignant insulinomas, were unreactive. The findings indicate that the antibodies recognize differentiation antigens on the carcinoid tumor cell surface preserved also on endocrine and nonendocrine cells of the normal bowel mucosa. The restricted tissue reactivity of the antibodies suggests that they may constitute useful tools in the histological characterization of carcinoid tumors. Further studies may reveal if they are applicable for immunolocalization and perhaps even immunotherapy of these neoplasms.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 367 (1975), S. 27-33 
    ISSN: 1432-2307
    Keywords: Chinese hamsters ; Mice ; Pancreatic islets ; 3H-N-nitrosomethylurea ; Whole-body autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Labelled N-nitrosomethylurea was injected intravenously into mice (C57/Bl strain) and Chinese hamsters. In whole-body autoradiograms the isotope was found to accumulate heavily in the islet tissue of the Chinese hamsters but not in that of the mice. The selective uptake in the islet tissue of Chinese hamsters was most pronounced after one hour. A dose of 50 mg/kg body weight of non-labelled N-nitrosomethylurea caused hyperglycemia in the Chinese hamsters while no hyperglycemia occurred in the mice at a dose of 150 mg/kg body weight. The results indicated that the diabetogenic effect of N-nitrosomethylurea is related to the ability of this substance, or a metabolite of it, to accumulate in the pancreatic islets.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 168 (1976), S. 33-43 
    ISSN: 1432-0878
    Keywords: Human fetal pancreas ; Endocrine cells ; Argyrophil reactions ; Light microscopy ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The endocrine cells in the pancreas of five human fetuses with gestational ages of 18–20 weeks were examined by light and electron microscopy with special regard to argyrophil reactions. B-cells and typical A and D-cells were easily identified electron microscopically on the basis of their typical secretory granules. In the Grimelius argyrophil silver stain, a concentration of silver grains over the less electron dense peripheral mantle of the A-cell secretory granules was observed by electron microscopy. In the Hellerström and Hellman modification of the argyrophil Davenport alcoholic silver stain, silver grains were concentrated over the internal structures of the D-cell secretory granules. With this stain an accumulation of silver grains was also seen at the surface of the A-cell secretory granules. The argyrophil reaction of the A-granules was less pronounced than in the D-cells. In addition to B-cells and A- and D-cells, two other types of endocrine cell were observed by electron microscopy. These cells were argyrophil with the silver impregnation method of Grimelius. The electron microscopic findings at least partly explain the frequent overlapping between the two staining methods observed at the light microscope level.
    Type of Medium: Electronic Resource
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