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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 17 (1990), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A case of signet-ring cell carcinoid of the gallbladder is reported. The tumour diffusely infiltrated the gallbladder wall and extensively ulcerated the mucosa. Neoplastic nests were composed of numerous signet-ring cells mixed with clear endocrine cells. The latter expressed chromogranin A, gastrin and somatostatin and contained neurosecretory granules. The diagnostic problem of differentiating between signet-ring cell carcinomas and composite adenocarcinoma-carcinoid tumours is discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aims:  To investigate whether the expression of interferon (IFN)-inducible gene IFI16 is inversely related to proliferative activity in vivo, we compared immunohistochemical reactivity of IFI16 in a series of head and neck squamous cell carcinomas (HNSCCs) with their proliferation index and the cell cycle regulator pRb. As human papillomavirus (HPV) infection is manifested by changes in the function or expression level of host genes such as IFN-inducible genes, we also investigated the presence of HPV DNA to determine whether head and neck cancers associated with HPV DNA can be distinguished from tumours that are presumably transformed by other mechanisms.Methods:  Thirty-six HNSCCs were evaluated for IFI16, pRb and Ki67 expression by immunohistochemistry. The presence of HPV was also detected by polymerase chain reaction. Nine tumours were located in the oropharynx (tonsillar area) and 27 in the larynx.Results:  HPV DNA was found in 14 of 25 (56%) laryngeal SCCs and in five of nine (56%) tonsillar SCC specimens examined; 17 out of the 19 HPV-DNA-positive cases showed high-grade IFI16 expression. Overall, proliferative activity was significantly related to tumour differentiation and histological grading. IFI16 protein expression was significantly inversely correlated with Ki67 (P = 0.039). Low-proliferating tumours positive for IFI16 staining showed a marked expression of pRb and a better prognosis than those whose tumours had low IFI16, pRb levels and a high proliferation index.Conclusions:  To our knowledge, this is the first expression analysis of the IFN-inducible IFI16 gene in HNSCC. Low-proliferating tumours positive for IFI16 staining showed a marked expression of pRb and a better prognosis than those whose tumours had low IFI16, pRb levels and a high proliferation index.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 24 (1994), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 26 (1970), S. 881-883 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Riassunto Le modalità di secrezione dei granuli contenenti Calcitonina da parte delle cellule C sono state studiate in tiroidi di cane in condizioni normali e in coltura organotipica con alto tenore di calcio. È stata notata la presenza di numerosi microtubuli alla periferia delle cellule e alcune immagini suggeriscono un attacco dei microtubuli ai granuli secretori. Viene prospettato che i microtubuli abbiano importanza nel meccanismo di secrezione delle cellule C e forse delle cellule della serie APUD in generale, e che questo possa essere del tipo «emiocitosi».
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 25 (1969), S. 641-642 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Riassunto Le cellule C (parafollicolari) della tiroide di cane conservano in vitro, in coltura organotipica, i loro caratteri istochimici ed ultrastrutturali. Tali cellule, cui viene attualmente attribuita la funzione di produrre calcitonina, reagiscono ad una elevazione del contenuto in calcio del terreno di coltura, con modificazioni istochimiche (perdita della argirofilia e metacromasia) e ultra-strutturali (diminuzione fino a scomparsa dei granuli di secrezione). Questi studii fanno ritenere possibile che la secrezione di calcitonina venga direttamente regolata dal livello del calcio.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1459
    Keywords: Mitochondrial changes ; Neurogenic atrophies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wird über einen Fall alter Poliomyelitis mit den Zeichen einer Schädigung des peripheren Motoneurons und über zwei Fälle neuraler Muskelatrophie (Charcot-Marie) berichtet. Das histologische Bild zeigte neurogene Veränderungen, welche unterschiedlich angelegt waren. Mittels der NADH-TR-Reaktion wurden in allen Fällen dunkelgefärbte amorphe Massen im subsarkolemmalen Bereich und Vermehrung der oxydativen Enzymaktivität in einzelnen Typ-I-Muskelfasern beobachtet. Elektronenmikroskopisch fanden sich Struktur- und Formanomalien der Mitochondrien, die in einem Fall parakristalline Einschlußkörper enthielten. Der Befund wird an Hand der Literatur diskutiert. Den Mitochondrienveränderungen kommt keine besondere spezifische Bedeutung zu; ihre Stelle bei den neurogenen Muskelatrophien wird erörtert.
    Notes: Summary A case of late motor neuron degeneration following poliomyelitis with abnormal mitochondria in muscle fibers is presented with two additional cases of systemic neurogenic muscular atrophy (Charcot-Marie-Tooth disease). Muscle biopsy revealed a neurogenic pattern of variable severity in all cases. Subsarcolemmal zones of hyperactivity and hyperpositive intermyofibrillar collections of granular material present in a variable proportion of type I fibers were demonstrated by oxidative enzymes. Ultrastructurally they corresponded to abnormal mitochondria, with paracrystalline inclusions in one case. The finding is discussed in the light of the previous literature on mitochondrial myopathies. Mitochondrial alterations are not specific and their significance in neurogenic conditions is debated.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 234 (1987), S. 52-54 
    ISSN: 1432-1459
    Keywords: Muscle amyloidosis ; Myeloma ; Muscle biopsy ; Muscle fibre conduction velocity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Weakness and stiffness appeared in a 65-year-old man affected by multiple myeloma. Muscle fibre conduction velocity was recorded in situ in the biceps brachii and found to be significantly decreased. Muscle biopsy, performed in the same muscle, showed amyloid deposition and moderate atrophy of muscle fibres, which was not sufficient to explain the reduction in muscle fibre conduction velocity. The results of the study suggest that amyloid interferes with conduction along the sarcolemma and that this plays a pathogenetic role mainly in the early stages of the disease.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 211 (1976), S. 125-133 
    ISSN: 1432-1459
    Keywords: Histochemistry ; Ultrastructure (tubular aggregates) ; Muscle ; Paramyotonia ; Myotonia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei einem Fall von kongenitaler Paramyotonie wurde eine Muskelbiopsie lichtmikroskopisch, histochemisch und elektronenoptisch untersucht. Typische Veränderungen ergaben sich in der ATPase-Färbung und in bezug auf oxydative Enzyme. Bei der elektronenoptischen Untersuchung wurden sogenannte „tubuläre Aggregate“ festgestellt. Es wird die Beziehung der zwei Gruppen von Veränderungen zueinander diskutiert sowie auch die Bedeutung derselben im Rahmen der periodischen Lähmungen und der myotonen Phänomene.
    Notes: Summary In a case of congenital paramyotonia a muscle biopsy was performed and studied morphologically, histochemically and ultrastructurally. A clearcut pattern of changes has been observed with ATPase and oxidative enzymes. On electron microscopy special changes known as “tubular aggregates” were found. The relationship between the two findings, as well as the significance of such alterations in the range of periodic paralyses and myotonic phenomena, are discussed.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-1459
    Keywords: Central core disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Aus einer Familie, in welcher die Erkrankung autosomal dominant vererbt wird, werden Vater und Tochter mit Central Core Disease beschrieben. Bei einem Fall besteht außerdem eine bilaterale congenitale Hüftgelenksluxation. Die in beiden Fällen durchgeführte Muskelbiopsie ergab folgendes: Dargestellt durch den histochemischen Nachweis oxydativer Enzyme fanden sich ausschließlich Typ-I-Fasern, von welchen die meisten ein und nicht selten sogar mehrere „Central Core“ aufwiesen. In der Elektronenmikroskopie erschienen die „Cores“ allgemein gut von den umgebenden Fibrillen abgegrenzt und waren durch das Fehlen von Mitochondrien und Anomalien der Z-Linien charakterisiert. Es wurden Übergänge zwischen normalen Fasern einerseits und vollständig unstrukturierten „Cores“ andererseits beobachtet, wie auch Übergänge von gut strukturierten und unstrukturierten „Cores“. Die Befunde werden unter Berücksichtigung der einschlägigen Literatur diskutiert. Es wird besonders eingegangen auf das Problem der Unterscheidung zwischen „Central Core“ und „Multiple Core“ und „Multiple Core Disease“. Die Pathogenese der Muskelveränderung wird im besondern auch im Hinblick auf die mögliche neurogene Verursachung diskutiert. Es wird im weitern auf die histochemischen und ultrastrukturellen Gemeinsamkeiten zwischen „Central Cores“ und „Target Fibers“ eingegangen.
    Notes: Summary Two cases of central core disease, father and daughter, of a family with dominant autosomal inheritance, are presented, one with bilateral congenital dislocation of the hip. Muscle biopsy was performed in both cases. Oxidative enzymes evidenced only type I fibers, most of them presenting a central core and not uncommonly more than one. On electron microscopy the cores generally appeared well demarcated from the surrounding fibrils and were characterized by lack of mitochondria and abnormalities of the Z line. Transitional aspects from normal fibers to completely unstructured cores were observed, as well as from well structured and unstructured cores. These findings are discussed in the light of the previous literature and particular attention is paid to the problem of differentiation between central core and multicore disease. The pathogenesis of the muscular alteration is also discussed in relation with the possibility of their neurogenic origin. Eventually, the histochemical and ultrastructural similarities between central cores and target fibers are focused.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular histology 6 (1974), S. 559-565 
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Synopsis Cholinesterase activity (similar to that described by others in some cell types of the APUD series) has been detected by light microscopy in several cells of the rat oxyntic mucosa: because of their shape and distribution they were interpreted as corresponding to the argyrophilic endocrine cells. Using the Karnovsky-Roots' procedure, cholinesterase activity was detected at the electron microscope level in the enterochromaffin-like (ECL) cells. The other endocrine cell type present in this area, the A-like cells, were devoid of specific acitivity. The possible significance of this enzymic activity with respect to lipid metabolism, membrane permeability and mechanism of secretion is discussed.
    Type of Medium: Electronic Resource
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