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  • 1
    ISSN: 1432-0428
    Keywords: Pancreatic islets ; A cells ; glucagon ; immuno-histochemistry ; α-granule stains ; xanthydrol ; o-phthalaldehyde ; HCl-basic dye ; phosphotungstic acid ; Grimelius' silver ; electron histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Des cellules stockant du glucagon ont été détectées dans les îlots pancréatiques du cheval, du cobaye, du lapin, du rat, du chien et de l'homme au moyen de procédés immuno-histochimiques indirects utilisant la fluorescéine ou la peroxydase comme marqueurs des sérums anti-glucagon. En colorant les îlots des chevaux avec des techniques de coloration sélectives pour les cellules A, B ou D, il a été directement prouvé que seules les cellules A réagissent aux sérums anti-glucagon. Une comparaison entre les méthodes connues pour colorer les granulesα et les méthodes immuno-histochimiques, ainsi que les expériencesin vitro sur le glucagon naturel et synthétique, ont montré que la méthode au xanthydrol et peut-être également la méthode à l'o-phtalaldéhyde, doivent être considérées comme des tests histochimiques spécifiques pour le glucagon; par contre la technique à l'HCl-colorant basique et l'hématéine phosphotungstique doivent être considérées comme des méthodes de coloration non spécifiques pour le glucagon, et la méthode à l'argent de Grimelius probablement comme ne concernant pas le glucagon. Au cours d'investigations ultrastructurales sur le pancréas humain, le centre des granulesα réagissait fortement à l'acide phosphotungstique et aux anticorps anti-glucagon marqués à la peroxydase, alors qu'il ne réagissait pas à l'argent de Grimelius; inversement le halo périphérique des granulesα réagissait fortement à l'argent de Grimelius, et réagissait peu ou pas à l'acide phosphotungstique et aux anticorps anti-glucagon. Ainsi, les résultats à la fois de microscopie optique et électronique indiquent une hétérogénéité structurale et chimique des granulesα.
    Abstract: Zusammenfassung Die Glucagon enthaltenden Zellen werden in der Bauchspeicheldrüse von Pferd, Meerschweinchen, Kaninchen, Ratte, Hund und Mensch durch immunhistochemische, indirekte Techniken mit Fluorescein-oder Peroxidase-Markierung von Anti-GlucagonAntikörpern lokalisiert. Durch aufeinanderfolgende Färbungen der Langerhansschen Inseln von Pferden mit spezifischen für die A, B und D Zellen histologischen Methoden, wurde bewiesen, daß nur die A Zellen mit AntiGlucagon-Antikörpern reagierten. Eine Gegenüberstellung der für die Färbung desα-Granulums bekannten Methoden, mit den immunhistochemischen Methoden, und den alsin vitro Untersuchungen über synthetisches und natürliches Glucagon, haben bewiesen, daß die Xanthydrol-Methode, und vielleicht auch dieo-Phtalaldehyd Methode, für das Glucagon spezifische Methoden darstellen, während die HCl-basischen Farbstoffe und die Phosphorwolframsäure-Hämatin Methoden, als unspezifische Färbemethoden für das Glucagon angesehen werden müssen; die Silbermethode nach Grimelius scheint nicht zum Glucagon in Beziehung zu stehen. In ultrastrukturellen Untersuchungen über die menschliche Bauchspeicheldrüse, reagierte das Zentrum (core) des Granulums stark auf die Phosphorwolframsäure und auf die mit Peroxidase markierten Anti-Glucagon-Antikörper, dagegen reagierte es nicht mit der Silbermethode nach Grimelius. Andererseits reagierte der periphere Hof desα Granulums wenig, oder überhaupt nicht mit der Phosphorwolframsäure und den Anti-Glucagon-Antikörpern. Daher zeigen die Ergebnisse von Licht-und Elektronenmikroskopie eine chemische und strukturelle Ungleichartigkeit desα-Granulums.
    Notes: Summary Glucagon-storing cells were detected in the pancreatic islets of horse, guinea pig, rabbit, rat, dog and man by means of indirect immuno-histochemical procedures using fluorescein or peroxidase as markers of antiglucagon sera. By subsequently staining horse islets with selective staining techniques for A, B or D cells, it was directly ascertained that only A cells reacted to antiglucagon sera. A comparison of methods known to stain a granules with immuno-histochemical methods, as well asin vitro experiments on natural and synthetic glucagon, showed that the xanthydrol method, and perhaps also theo-phthalaldehyde method, should be regarded as specific histochemical tests for glucagon whereas the HCl-basic dye technique and phosphotungstic haematein should be considered as unspecific glucagon-staining methods,and Grimelius' silver as a method likely to be unrelated to glucagon. In ultrastructural investigations on the human pancreas, the core of the a granule heavily reacted to phosphotungstic acid and peroxidase-marked antiglucagon antibodies, while being unreactive to Grimelius' silver; conversely, the peripheral halo of theα granule heavily reacted to Grimelius' silver, while being poorly reactive or unreactive to phosphotungstic acid and anti-glucagon antibodies. Thus, both light and electron microscopy findings point to a structural and chemical hetereogeneity of theα granule.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0890-8508
    Keywords: chromogranin A ; electron microscopy ; immunohistochemistry ; neuroendocrine cells ; neuroendocrine tumours ; protein p38 ; synaptophysin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 4 (1980), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Mucoid carcinoma of the breast is not a single homogeneous entity. It comprises two main variants separable on structural and cytological grounds and a smaller transitional type. The salient pathological differences are detailed. One variant is usually arygrophilic and contains dense core granules of the type seen in endocrine tumours. Both endocrine and amphicrine cells have been identified in this subtype. The relationship of this endocrine variant of mucoid carcinoma to other argyrophil carcinomas (so-called ‘carcinoids’) of the breast is discussed.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Two types of endocrine-paracrine (EP) cells have been detected histochemically and ultrastructurally in normal and hyperplastic prostates; i.e. type 1 cells resembling intestinal EC (enterochromaffin) cells and type 2 cells similar to urethral EP cells previously reported by Casanova et al. (1974). About one-third of the 40 prostatic carcinomas studied contained EP cells. Four tumours showed a very large number of EP cells: two of these were composite tumours exhibiting both adenocarcinomatous and carcinoid patterns. These four tumours have also been studied histochemically and ultrastructurally. ACTH and β-endorphin immuno-reactive cells, ultrastructurally resembling pituitary corticotrophic cells, have been identified in three tumours. Cells identical with type 1 and type 2 cells of the normal prostate were detected in two cases and in a further case, respectively.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 5 (1981), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Eleven cases of primary pancreatic adenocarcinomas have been investigated histochemically, immunohistochemically and with electron-microscopy. Endocrine-paracrine (EP) cells were present in six of these tumours. In one case numerous 5HT-enterochromaffin cells (EC) of the intestinal type and a few somatostatin immunoreactive D cells were found. Two cases contained insulin-immunoreactive cells and another case displayed glucagon-IR elements. In the remaining two cases argyrophilic cells were present. These findings demonstrate that polypeptide hormone or amine production is not restricted to islet cell tumours. It is suggested that both endocrine and exocrine components of the tumours studied might have derived from a common precursor.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Three cases of gastric parietal cell carcinoma are described. Tumour cells are round to polygonal, with abundant eosinophilic, granular cytoplasm reactive with phosphotungstic acid haematoxylin and Luxol Fast Blue. Ultrastructurally the tumour cells are characterized by abundant mitochondria, tubulovesicles, intracellular canaliculi and intercellular lumina filled with undulated microvilli.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 7 (1983), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A series of 15 Merkel cell tumours of skin is reported. They occur dominantly on the head and neck and on the extremities of elderly women, frequently presenting as a reddish nodule. Three cases were associated with squamous carcinoma at the same site, an association deserving further study. There are two main patterns: the commoner one takes the form of a trabecular carcinoma in the dermis mimicking metastatic carcinoma, including oat-cell carcinoma and neuroblastoma: a dissociated-cell form mimicks malignant lymphymphoma. The triad of vesicular nuclei with very small nucleoli, abundant mitotic activity and apoptosis is so characteristic as to be virtually pathognomonic in conjunction with structural features. Argyrophilia is common, but Bourn fixation is necessary to demonstrate it regularly. Small round secretory granules (89 ± 18 nm) with narrow haloes, and an abundance of intermediate size filaments are among the ultrastructural hallmarks. There is a close similarity between better differentiated tumour cells and normal Merkel cells. The neural crest origin of MC is in doubt both on the basis of studies of the development and regeneration of MC and from the study of Merkel cell tumours.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Ultramicroscopy 12 (1983), S. 126-127 
    ISSN: 0304-3991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0196-9781
    Keywords: Electronmicroscopy ; Endocrine cells ; Endocrine tumors ; Glicentin ; Glucagon ; Gut ; Immunocytochemistry ; PP-icosapeptide ; Pancreas ; Pancreatic polypeptide (PP) ; Peptide YY (PYY)
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Peptides 6 (1985), S. 197-202 
    ISSN: 0196-9781
    Keywords: Amphibian skin peptides ; Gonadotroph cells ; Immunohistochemistry ; Pituitary cells ; Rat adenohypophysis ; Tryptophyllins
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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