Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 76 (1998), S. 413-420 
    ISSN: 1432-1440
    Keywords: Key words Endocrine tumors ; Histochemistry ; Electron microscopy ; Pathology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Recent developments in the field of endocrine cell biology and pathology at both morphological and molecular levels are briefly outlined and discussed as a basis for endocrine tumor characterization. The main tools available for identifying the endocrine nature of the tumors, their pathogenetic interpretation, and experimental reproduction with special emphasis on tumor antecedents are reported. Based on this, classifications of endocrine tumors of the pancreas and gastrointestinal tract are developed, covering most clinical (hyperfunctional syndromes included), pathological, and biological patterns, with special emphasis on tumor prognosis.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 196-197 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In all species examined, enterochromaffin cells of duodenum and stomach fixed with both formaldehyde and glutaraldehyde gave positive diazonium (fast garnet GBC, pH 7-8), Masson-Hamperl and Schmorl reactions. Enterochromaffin substance appeared to be well preserved by both aldehydes, although ...
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Morphometric assessment of gastric antral atrophy: comparison with visual evaluation Aims: As part of a multinational effort to reach a consensus in the definition and evaluation of atrophic gastritis, we applied morphometric techniques to 22 antral biopsy specimens examined visually by 12 experienced gastrointestinal pathologists. Methods and results: Atrophy was defined as loss of glands. Each pathologist graded atrophy with both non-standardized and standardized approaches. Discriminant function analyses of morphometric measurements were conducted to validate and grade atrophy. Kappa statistics were used to compare the performance of each pathologist against the group mode and against the discriminant functions’ grading of atrophy. Three morphometric indexes showed significant differences among categories of atrophy utilizing non-standardized as well as standardized visual atrophy grades: (i) the ratio of glandular length to total mucosal thickness; (ii) the proportion of the secretory compartment area occupied by glands; and (iii) the number of glandular cross sections per 40× microscopic field. The discriminant function analyses verified all cases classified visually as either non-atrophic, or moderately/severely atrophic; it verified as mildly atrophic 40% of the cases classified visually as mildly atrophic; and classified the remaining 60% as moderately or severely atrophic. The κ statistics were good or excellent for the majority of pathologists. Conclusions: The evaluation of antral atrophy, simply defined as loss of glands, can be reliable and reproducible. The visual grading of atrophy as absent, moderate and severe is entirely consistent with objective morphometric observations.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 7 (1993), S. 0 
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In both rodents and humans the development of gastrin-promoted gastric argyrophil enterochromaffin-like cell carcinoids requires the involvement of a genetic factor inherent to multiple endocrine neoplasia syndrome or of type A autoimmune chronic atrophic gastritis. Prolonged severe hypergastrinaemia acting on non-gastritic mucosa, as in Zollinger-Ellison syndrome patients, results in diffuse argyrophil enterochromaffin-like cell hyperplasia but, as a rule, does not produce tumours. Combination of chronic atrophic gastritis (mostly related to Helicobacter pylori infection) with hypergastrinaemia frequently causes linear and micronodular hyperplasia of argyrophil cells, whereas carcinoids are exceptional. No tumours or preneoplastic lesions have been observed in patients treated long-term with proton pump inhibitors, apart from rare cases in patients with combined Zollinger-Ellison and multiple endocrine neoplasia syndromes. A moderate increase in the incidence of argyrophil cell clustering, with or without hyperplasia, probably results from the parallel evolution of ulcer-associated Helicobacter gastritis into chronic atrophic gastritis. Eradication of H. pylori with a combination of proton pump inhibitors and antibiotics suppresses gastritis and prevents ulcer recurrence.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background and aims : Considerable difficulties persist amongst pathologists in agreeing on the presence and severity of gastric atrophy. An international group of pathologists pursued the following aims: (i) to generate an acceptable definition and a simple reproducible classification of gastric atrophy; and (ii) to develop guidelines for the recognition of atrophy useful for increasing agreement among observers.Methods : After redefining atrophy as the ‘loss of appropriate glands’ and examining histological samples from different gastric compartments, three categories were identified: (i) negative; (ii) indefinite; (iii) atrophy, with and without intestinalization. Atrophy was graded on a three-level scale. Interobserver reproducibility of the classification was tested by κ statistics (general and weighted) in a series of 48 cases.Results : The medians of the general agreement and weighted κ values were 0.78 and 0.73, respectively. The weighted κ coefficients, obtained by cross-tabulating the evaluation of each pathologist against all others, were, with only one exception, 〉 0.4 (moderate to excellent agreement).Conclusions : By using the definition of atrophy as the loss of appropriate glands and distinguishing the two main morphological entities of metaplastic and non-metaplastic types, a high level of agreement was achieved by a group of gastrointestinal pathologists trained in different cultural contexts.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...