Bibliothek

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • 1990-1994
  • 1980-1984  (12)
  • 1920-1924
  • 1980  (12)
  • Immunohistochemistry
  • 1
    ISSN: 1432-1440
    Schlagwort(e): Plasmozytom ; Immunhistochemie ; Monoclonalität ; Malignes Lymphom ; Plasmocytoma ; Immunohistochemistry ; Monoclonality ; Malignant lymphoma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary A case of myeloma showed histologically a monotonous pattern of relatively mature myeloma cells and an IgG-kappa paraproteinemia. In contrast to ordinary stains, the immunoperoxidase reactions for kappa and gamma gave inhomogeneous results. Light and heavy chains were formed by clusters of different subpopulations of myeloma cells. Serial sections showed that kappa-positive clusters were gamma-negative and vice versa. Thus, this morphologically homogeneous myeloma turned out to be immunohistochemically heterogeneous. We assume that two subpopulations have developed that produced separately kappa- and gamma-chains. Therefore, these chains might have been circulating separately and not as complete IgG-kappa molecules. Guided by our findings, the results of other investigators are discussed. Some considerations on the validity of immunohistochemical demonstration of tumor cell monoclonality are given implicating the diagnostic equivocation of immunohistochemistry for non-Hodgkin's lymphomas, especially for so-called “immunocytomas”.
    Notizen: Zusammenfassung Ein Plasmozytomfall zeigte histologisch eine monotone, gleichmäßige Proliferation reifer Myelomzellen und eine IgG-Kappa-Paraproteinämie. Im Gegensatz zu histologischen Färbungen erbrachten die Immunperoxidase-Reaktionen für Kappa und Gamma ein inhomogenes Ergebnis. Leichte und schwere Ketten wurden von verschiedenen Subpopulationen der Plasmozytomzellen gebildet. Serienschnitte zeigten, daß Kappa-positive Areale Gamma-negativ waren und umgekehrt. So erwies sich dies morphologisch homogene Plasmozytom als immunhistochemisch heterogen. Wir nehmen an, daß sich zwei Subpopulationen entwickelt haben, die getrennt Kappa- und Gamma-Ketten bilden. Es ist möglich, daß diese Ketten auch getrennt zirkulierten und nicht als vollständige IgG-Kappa-Moleküle. Auf der Grundlage dieser Ergebnisse werden entsprechende Resultate anderer Untersucher diskutiert. Theoretische Überlegungen zum immunhistochemischen Nachweis einer Tumorzellmonoclonalität zeigen die fragwürdige Relevanz dieser Methodik für die Diagnostik der Nicht-Hodgkin-Lymphome auf, insbesondere für die sogenannten Immunozytome der Kiel-Klassifikation.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    ISSN: 1432-2307
    Schlagwort(e): Pituitary adenoma ; Prolactin ; Ultrastructure ; Immunohistochemistry ; Morphometry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Fifteen cases of pituitary adenoma, 14 of which were associated with hyperprolactinemia, were studied by observation and granule morphometry of electron micrographs, immunohistochemistry and sequential observation of in vitro release with regard to hormone production, storage and secretion. Adenoma cells of 6 cases with marked elevation of plasma prolactin were sparsely granulated, showed characteristic ultrastrucures including the presence of small secretory granules, well developed Golgi and rough membranes, misplaced exocytosis, and positive or negative immunostaining for prolactin. These adenomas also showed vigorous release of the hormone into the circulation and/or culture medium. In vitro studies showed that negative immunostaining of adenoma cells did not preclude the production and secretion of the hormone. One densely granulated adenoma containing cells with numerous lactotroph type granules showed moderate release of prolactin into the circulation. In an acromegalic case associated with both high plasma growth hormone and prolactin, some cells were shown by immunohistochemistry to store both hormones. There were 4 adenomas which could not be shown to produce, store and secrete prolactin by any method available.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Virchows Archiv 388 (1980), S. 251-262 
    ISSN: 1432-2307
    Schlagwort(e): Human ; Immunohistochemistry ; Testicular teratoma ; EC-cells ; Somatostatin ; Glucagon ; Pancreatic polypeptide
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Differentiated teratomas frequently contain the apparent equivalent of gastrointestinal mucosa. 53 testicular teratomas were investigated for the incidence of entero-endocrine cells. Enterochromaffin(EC)-cells were demonstrated by formaldehyde induced fluorescence (FIF), while the other endocrine cells were identified by immunohistochemistry. 11 of 53 teratomas contained endocrine cells associated with the gastrointestinal epithelium. The most frequently found cell type was the EC-cell, followed by somatostatin-, glucagon- and pancreatic polypeptide-immunoreactive cells. The teratoma tissue blocks (20 of 53) also frequently exhibited normal testicular tissue which did not contain any EC-cell or other entero-endocrine cells. The results are of interest in considering the cytogenesis of entero-endocrine cells and the histogenesis of testicular carcinoids, indicating that the entero-endocrine cells derive from the intestinal epithelium arising from undifferentiated stem cells. Furthermore, it seems probable that primary testicular carcinoids can develop from pre-existent teratomas by proliferation of their entero-endocrine cells.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Anatomy and embryology 159 (1980), S. 125-135 
    ISSN: 1432-0568
    Schlagwort(e): Heart conducting system ; Purkinje fibres ; Development ; Immunohistochemistry ; Enzyme histochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In the bovine fetal heart, subendocardial bundles of cells could be distinguished from the main myocardial mass. Their morphological characteristics suggest that they represent bundles of Purkinje fibres. An intense fluorescence after incubation in antisera against the intermediate filament protein skeletin also supports this suggestion. Further, the bundles exhibited different histochemical reactions from the main myocardial mass. During development the histochemical pattern changed. Bundle cells in mitosis were observed. With increasing fetal age, binucleate cells were seen progressively more frequently. Our observations indicate that the Purkinje fibres differentiate along a line separate from the ordinary myocardial cells and that they acquire their adult characteristics gradually.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 211 (1980), S. 241-250 
    ISSN: 1432-0878
    Schlagwort(e): Substance P-related peptides ; Immunohistochemistry ; Hypothalamus ; Amphibia (Triturus cristatus, Xenopus laevis, Rana esculenta)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The occurrence of Substance P-(SP)-related peptides in the hypothalamus of three species of Amphibia (newt, clawed, toad, frog) was studied immunohistochemically employing the indirect immunofluorescence method or a double-step technique (indirect immunofluorescence followed by the peroxidase-antiperoxidase complex method). SP-like immunopositive fibers are seen throughout the hypothalamus. They are especially abundant in the preoptic area and in the outer zone of the median eminence, suggesting a role of SP-related peptides in the hypothalamo-hypophysial regulation in these animals. Some SP-like neurons are seen in the posterior hypothalamus and in the preoptic area. In the newt, such SP-like immunopositive neurons occur frequently in the preoptic periventricular grey.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 209 (1980), S. 161-166 
    ISSN: 1432-0878
    Schlagwort(e): 1,25 (OH)2 vitamin D3 ; Thyrotropes ; Autoradiography ; Immunohistochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary In the anterior pituitary of the rat, target cells of 1,25 (OH)2 vitamin D3 are identified as those that secrete thyroid stimulating hormone by means of a combined technique of thaw-mount autoradiography and immunohistochemistry. The results for the first time provide evidence that suggests a central effect of 1,25 (OH)2 vitamin D3 on the modulation of thyrotropin secretion in a manner similar to that of other steroid hormones at the level of the pituitary.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 205 (1980), S. 187-198 
    ISSN: 1432-0878
    Schlagwort(e): Pancreatic polypeptide (PP) ; Glucagon ; Pancreatic islet ; Xiphophorus helleri ; Immunohistochemistry ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Beschreibung / Inhaltsverzeichnis: Résumé L'étude immunohistochimique de l'îlot pancréatique du poisson téléostéen Xiphophorus helleri, à l'aide de sérums anti-polypeptide pancréatique (PP) et anti-glucagon a permis de montrer que deux populations cellulaires distinctes sont responsables de la sécrétion de ces hormones. L'observation comparée de coupes sériées, ultrafines et semifines, traitées par la technique immunohistochimique, a démontré que les cellules à PP correspondent aux cellules qui avaient été précédemment définies, dans cette espèce, comme “cellules A2 à grains ronds” et que les cellules sécrétrices de glucagon sont les “cellules A2 à grains cristallins”. L'hypothèse de l'existence de deux catégories de cellules à glucagon chez les téléostéens est abandonnée.
    Notizen: Summary Correlative immunohistochemical and electron microscopical studies on the pancreatic islet of the teleost fish Xiphophorus helleri using antibodies to pancreatic polypeptide (PP) and glucagon show that separate cell types are responsible for the production of these peptides. The PP-cells correspond to the previously described “A2-cells with round granules”, while the “A2-cells with crystalline granules” are the true glucagon cells. An earlier suggestion that there are two types of glucagon cells in teleost islets is therefore withdrawn.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 205 (1980), S. 327-331 
    ISSN: 1432-0878
    Schlagwort(e): Somatostatin ; Cortical cells and fibers ; Immunohistochemistry ; Rat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Using light microscopic immunohistochemistry, somatostatinpositive structures were observed in the cortex of the rat. These structures, including cells and fibers, are widely distributed in all cortical laminae and are also found in the basal ganglia. The positive results were obtained exclusively in two groups of animals sacrificed during two different months of two subsequent years. The reason for this variability in the immunocytochemical stainability of cortical structures remains enigmatic.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 209 (1980), S. 239-256 
    ISSN: 1432-0878
    Schlagwort(e): Hamster ; LHRH ; Immunohistochemistry ; Olfactory systems ; Feedback loops
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Vibra tome sections of male hamster brains were treated immunohistochemically with LHRH antiserum, and the anatomical distribution of LHRH immunoreactive cells and nerve fibers was assessed. LHRH-cell bodies are found in the ventral hypothalamus that includes its preoptic, anterior and central parts, in the septum, the olfactory tubercle, the main and accessory olfactory bulb, and the prepiriform cortex. In addition, extracerebral LHRH-neurons and ganglia exist in LHRH-positive nerves at the ventromedial surface of the olfactory tubercle and bulb as well as in olfactory nerves. Dense networks of LHRH-immunoreactive fibers are found in all regions where LHRH-cell bodies exist. Intraseptal connections reach the organum vasculosum of the lamina terminalis, the subfornical organ, and the lateral ventricle. Dorsolateral projections from the septum can be traced via the fimbria hippocampi and alveus to the ventral hippocampus, via the stria terminalis to the amygdala and piriform cortex. Ventrolateral projections extend from the level of the olfactory tubercle and preoptic-anterior hypothalamic area via the ventral amygdalofugal pathway to the prepiriform and piriform cortex as well as the amygdala. Dorsal supracallosal projections via the stria longitudinalis are seen in the induseum griseum and the cingulate cortex. Caudal efferents reach the habenula, interpeduncular nucleus, midbrain raphe, and central gray of the rostral fourth ventricle via the stria medullaris and fasciculus retroflexus and by a ventral projection via the periventricular and subventricular hypothalamus. A major portion of this ventrocaudal projection gives rise to a dense network in the median eminence. Anatomical relationships of LHRH-fibers to certain regions of the inner ventricular and outer brain surface are noted.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 209 (1980), S. 455-472 
    ISSN: 1432-0878
    Schlagwort(e): Hypothalamus ; Somatostatin ; Immunohistochemistry ; Adrenalgland ; Garden dormouse
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Cells and fibers containing somatostatin (SRIF) or SRIF-like peptides were detected immunocytochemically in the brain of the garden dormouse (Eliomys quercinus L.). The periventricular preoptic nucleus and the paraventricular nucleus encompass a component of the SRIF-immunoreactive hypothalamoinfundibular and hypothalamo-neurohypophyseal systems. The suprachiasmatic, ventromedial and arcuate nuclei contain a number of SRIF-positive cells and receive a rich SRIF innervation. The extrahypothalamic systems containing SRIF can be subdivided into the following groups: (1) Afferents, the cellular origin of which is not always clearly evident, i.e., fibers of the septum, the lateral preoptic area, the thalamus, the superior olivary nucleus, the mesencephalic gray matter, and the subfornical organ; (2) dispersed cells with short projections (neocortex, caudate nucleus, putamen); (3) scattered cells with short projections (nucleus accumbens) or innervating remote territories (nucleus interpeduncularis); (4) vascular organ of the lamina terminalis, a neurohemal area comparable to the median eminence. These observations lead to a theory of a functional bipotentiality of the somatostatin molecule. Immunocytological results depend on the antisera employed, the type of fixation and the experimental conditions. Adrenalectomy is followed by an accumulation of immunoreactive material in all SRIF-containing systems of the brain. These results clearly indicate that SRIF participates in the function of the CRF-ACTH-adrenal axis. The endocrine disturbance induced by adrenalectomy appears to modify the activity of both the neurohormonal and neuromodulator components of the SRIF system.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 11
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 211 (1980), S. 1-4 
    ISSN: 1432-0878
    Schlagwort(e): Pars distalis ; Immunohistochemistry ; Prolactin ; LH gonadotroph ; Acidophil
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The fine structure of some oval anterior pituitary cells of the adult male rats immunostained with an antiserum to rat prolactin was investigated electron microscopically on the adjacent thin sections. Their fine structural appearance is identical with that of acidophils of the small granule type (Yoshimura et al. 1974) resembling the Kurosumi-Oota LH gonadotrophs. The secretory granules of the oval cells are spherical in shape, ranging from 130 to 200 nm in diameter. Large polymorphic granules, which are generally believed to be characteristic of prolactin cells, are absent from their cytoplasm. It is concluded that the acidophil of the small granule type with a similar fine structure to the Kurosumi-Oota LH gonadotroph is a prolactin secreting cell.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 12
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 213 (1980), S. 465-474 
    ISSN: 1432-0878
    Schlagwort(e): LHRH ; Immunohistochemistry ; Light and electron microscopy ; Median eminence ; Hypothalamus ; Perinatal rat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The appearance and localization of LHRH were studied in the developing hypothalamus of perinatal rats using the unlabelled antibody method. By light microscopy, immunoreactive LHRH was first detected as brown dots on day 18.5 of gestation in the OVLT and on day 19.5 in the median eminence, respectively. When the median eminence was examined by the preembedding immunohistochemistry technique for electron microscopy, the occurrence of immunoreactive LHRH fibers could be demonstrated on day 18.5. These fibers were thin and very occasionally encountered near the surface of the lateral regions of the median eminence. The axoplasm contained a few immunopositive secretory granules and also extragranular immunoreactive products. With development, a gradual increase was noted both in number and size of nerve fibers with a concomitant accumulation of secretory granules within the axoplasm. A possible physiological significance of LHRH is discussed in relation to the onset of hypothalamo-hypophysial system in fetal life.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...