Bibliothek

feed icon rss

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
  • 1
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The influence of the epithelial mucin MUC1 on T cell-mediated lysis was analysed using lymph node lymphocytes (LNL) from patients with colorectal carcinoma. LNL were stimulated with allogeneic, MUC1-transfected B cells and the bulk cultures were cloned. Alloreactive cytotoxic T cell clones were obtained which preferentially lysed MUC1-expressing targets. The majority was CD4+ and MHC-class II-restricted, and a minor group was CD8+ and MHC-class I-restricted. All the clones expressed CD3 and TCRαβ, and were CD56−. The capacity to preferentially kill MUC1-expressing targets was stable in several clones for up to 6 months in culture. The enhancing effect of MUC1 on the lysis was investigated in more detail. It was only seen after inhibition of O-linked glycosylation in the targets. Furthermore, this effect was completely abrogated by the monoclonal antibody 3C9, directed against the Thomsen–Friedenreich antigen (T-antigen, Galβ1–3GalNAc bound α1–3 to Ser/Thr) as well as by the soluble disaccharide Galβ1–3GalNAc, but not by other similar disaccharides. The authors conclude that in their system the preferential killing of MUC1-expressing targets is due to the recognition of an internal carbohydrate epitope accessible on underglycosylated MUC1, possibly T-antigen, by an auxiliary receptor molecule on T cells.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    ISSN: 1432-1440
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary A non-β-cell islet tumor of the pancreas, removed on operation from a sixty year old man with the Zollinger-Ellison-Syndrom has been investigated by pharmacological, histochemical and biochemical methods. The gastrin-like activity of this tumor could be demonstrated by pharmacological assay in the cat. On histochemical and histological investigation large extracellularly situated globules containing mucopolysaccharides, reactive protein-groups and lysosomal enzymes were found among cords of tumorcells separated by connective tissue. On histochemical grounds it is concluded that these granules contain secretory material with some endocrine qualities. The biochemical assay of the tumor tissue corresponded to the histochemical pattern of the tumor; in addition, it revealed a very high activity of the glycolytic enzymes compared with normal pancreas. In contrast to the finding in other tumors a very high activity of the enzyme glycerophosphatedehydrogenase (E.C. 1.1.1.8) in the tumor was found.
    Notizen: Zusammenfassung Es wird über das Krankheitsbild eines 60jährigen Patienten mit Zollinger-Ellison-Syndrom berichtet. Im exstirpierten Tumor ließ sich eine gastrinähnliche Aktivität nachweisen. Histologisch und histochemisch kam neben dem reichlichen Bindegewebe und dem Tumorepithel eine dritte Struktur in Form von Granula, die intralacunär in der Gefäßwand oder intraluminal gelegen waren, zur Darstellung. Neben Mucopolysacchariden und Protein enthielten diese Granula lysosomale Enzyme. Auf Grund dieser Eigenschaften dürfte es sich um Sekret- bzw. Inkretgranula handeln. Ihre Beziehung zur nachgewiesenen gastrinähnlichen Aktivität wird diskutiert. Die ergänzend durchgeführten biochemischen Untersuchungen im Tumorgewebe ergaben mit den histochemischen Befunden übereinstimmende Ergebnisse und zeigten darüber hinaus eine gegenüber dem normalen Pankreas um das fünffache gesteigerte Aktivität der glykolytischen Enzyme. Abweichend von anderen Tumoren fand sich eine ungewöhnlich hohe Aktivität der Glycerophosphatdehydrogenase (E.C.1.1.1.8) im Tumorgewebe.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 48 (1970), S. 1216-1225 
    ISSN: 1432-1440
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary 6 groups of patients with intestinal disturbances and 23 controls were subjected to small-intestinal biopsy. The material was investigated using dissecting microscopical, histological, morphometrical, histochemical, electronmicroscopical and mitotic counting techniques. Dissecting microscopical appearances, morphometrical and cellkinetic data revealed a considerable variation of the normal mucosa and showed changes of a sprue-like pattern in some of the biopsies in 2 of the groups investigated (chronic renal failure and Crohn's disease), however, differed quantitatively in a specific way with respect to the lower degree of mucosal transformation from the changes in idiopathic steatorrhoea. The cytochemical and electronmicroscopical data will be presented separately.
    Notizen: Zusammenfassung 6 Patientengruppen mit verschiedenen intestinalen Störungen und ein Kontrollkollektiv werden dünndarmbioptisch untersucht. Das Material wird lupenmikroskopisch, histologisch, morphometrisch, histochemisch, hinsichtlich seiner mitotischen Aktivität und z. T. elektronenmikroskopisch aufgearbeitet und ausgewertet. Die lupenmikroskopischen, morphometrischen und zellkinetischen Befunde zeigen neben einer erheblichen Variabilität des normalen Oberflächenreliefs und Schleimhautaufbaus in 2 Gruppen auch sprue-ähnliche Schleimhautveränderungen. Diese sind quantitativ spezifisch von denen bei der Sprue unterschieden. Die cytochemischen und elektronenmikroskopischen Befunde werden getrennt mitgeteilt.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 49 (1971), S. 1218-1222 
    ISSN: 1432-1440
    Schlagwort(e): Small intestine ; absorption ; methods ; Dünndarm ; Resorption ; Methoden
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Es wird über eine neu entwickelte automatisierte Methode der segmentalen Dünndarmperfusion berichtet, die ein dreilumiges Sondensystem (Ingelfinger et al.) verwendet. Durch die erreichte Vereinfachung der Technik erscheint es möglich, diese Methode jetzt auch in Kliniken, vor allem in der speziellen gastroenterologischen Diagnostik einzusetzen. An Hand von Mehrfachmessungen am gleichen Patienten wird die Reproduzierbarkeit der Ergebnisse und die Validität der Methodik herausgestellt und ihr Vorteil gegenüber bisher gebräuchlichen Verfahren diskutiert.
    Notizen: Summary An automatic perfusion system for segmental measurements of intestinal absorption is described. This makes use of the triple-lumen tube according to Ingelfinger and coworkers. Its application for diagnostic procedures in routine gastroenterology is shown. The reliability of the data obtained is demonstrated by repeated measurements in the same patient. The advantage of this method is discussed in comparison with the techniques hitherto used.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    ISSN: 1432-1440
    Schlagwort(e): Small intestine ; effect of Phenformin ; absorption ; enzymes ; ATP ; histology ; rat ; man ; Dünndarm ; Phenformin ; Resorption ; Enzyme ; ATP ; Histologie ; Ratte ; Mensch
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung In der vorliegenden Studie wird erstmalig der Einfluß von Phenformin (25 mg/kg Ratte) auf die Wasser- und Elektrolytresorption an der Ratte untersucht. Im Hinbliek auf die an Leber- und Nierenmitochondrien nachgewiesene Hemmung der oxydativen Phosphorylierung durch Biguanide wird weiterhin der Einfluß des Phenformins auf die Adeninnucleotide des Rattendünndarms geprüft. Zur Frage nach der cellulären und mukösen Integrität der Dünndarmschleimhaut unter Phenformin werden cytochemische und morphometrische Untersuchungen angestellt. Darüber hinaus wird die Glucoseresorption mittels kontinuierlicher in vivo-Perfusion gemessen. Zur Frage der physiologischen Relevanz der an der Ratte durchgeführten Untersuchungen wird die Glucoseresorption am Menschen mittels der dreilumigen Sonde bei physiologischer Phenforminbelastung (150 mg/d) geprüft. Ergebnisse an der Ratte: 1. Der Wassernettotransport sowie der unidirektionale22Na+-Fluß werden ebenso wie die Glucoseresorption signifikant durch Phenformin gehemmt. 2. Der mittlere ATP-Gehalt der Dünndarmwand wird durch Phenformin um ca. 30% gesenkt. 3. Die in den verschiedenen Kompartimenten des reifen Resorptionsepithels cytochemisch nachgewiesenen Markerenzyme sind insgesamt reduziert. 4. Die morphologische Integrität der Dünndarmschleimhaut ist erhalten. Vermutlich als Ausdruck einer durch die Perfusion bedingten gesteigerten Zellexfoliation sind die Zottenhöhen geringgradig reduziert. Ergebnisse am Menschen: 1. Die Glucoseresorption wird unter physiologischen Phenformingaben signifikant herabgesetzt. Dieser Effekt ist sehr flüchtig. 2. Cytochemische und morphologische Veränderungen sind am Biopsiematerial nicht nachweisbar.
    Notizen: Summary The influence of Phenformin (25 mg/kg body weight) on the small intestinal absorption of glucose, glycine, water and electrolytes has been investigated in the rat using a continuous perfusion technique. Furtheron, its influence on adenin nucleotides, cytochemical reactivity and morphology of the mucosa of the small intestine was studied. The physiological relevance of the findings obtained in the rat was checked in man by studying glucose absorption after a 150 mg Phenformin load using a triple-lumen perfusion system. Results in the rat: 1. The transport of glucose, glycine and water as well as the unidirectional flux of22Na+ were significantly reduced. 2. ATP-levels were diminished by approximately 30%. 3. The enzymatic activity of the absorptive epithelium was slightly decreased as judged by cytochemical methods. 4. The morphological integrity of the mucosa of the small intestine was in general maintained, but extrusion of absorptive cells at the tips of the villi seemed to be increased. Results in man: 1. Glucose absorption was significantly reduced when a therapeutical load of 150 mg was given as a single dose. This effect was shown briefly after application of the drug but could not be demonstrated 12 hours thereafter. 2. Neither morphological nor cytochemical changes could be observed in the biopsies taken shortly after Phenformin application at the dosage given.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    ISSN: 1432-1440
    Schlagwort(e): Small intestine ; Absorption ; Glucagon ; Man ; Dünndarm ; Resorption ; Glucagon ; Mensch
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Der Einfluß von Glucagon auf die Resorption von Glucose, Wasser, Natrium und Kalium wurde mittels der segmentalen Dünndarmperfusion mit einer dreilumigen Sonde im oberen Jejunum bei 1) stoffwechselgesunden Probanden, 2) Altersdiabetikern mit verminderter Insulinsekretion nach Glucagongabe, 3) insulinbedürftigen Diabetikern vom Typ des juvenilen Diabetes mellitus untersucht. Nach Messung der Resorption über zwei 30 min-Perioden wurde den Probanden 1 mg Glucagon intravenös injiziert und danach die Resorption über vier 15 min-Perioden ermittelt. Ergebnisse: Nach der Glucagongabe trat in allen drei Gruppen zunächst ein kurzdauernder Anstieg der Glucoseresorption auf. Dieser war bei den Diabetikern stärker als bei den stoffwechselgesunden Probanden. Anschließend kam es zu einer signifikanten Resorptionsminderung für Glucose. Die Wasser- und Natriumresorption wurden durch Glucagon gehemmt, Kalium wurde ins Darmlumen sezerniert.
    Notizen: Summary Jejunal absorption of glucose, water, sodium and potassium was investigated under the influence of intravenously injected glucagon. This was done in 1) metabolically healthy adults, 2) patients with growth onset diabetes and reduced insulin secretion after glucagon, 3) patients with juvenile onset diabetes who do not secrete insulin after glucagon injection. A triple lumen perfusion technique was used. Results: There is an initial short lasting increase of glucose absorption after glucagon administration in all three groups investigated. This was more pronounced in the diabetics than in the metabolically healthy adults. In a second phase, which was most marked 30–45 minutes after glucagon administration, a significant decrease of glucose absorption was seen. Sodium and water uptake were reduced after glucagon administration and potassium was found to be secreted into the lumen.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    ISSN: 1432-1440
    Schlagwort(e): Genetics ; Hepatitis-B virus ; Immunogenetics ; Vaccination
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The variation in immune responses to standard inoculation of the hepatitis-B virus vaccine suggest that host factors influence response in ways that are not presently understood. We studied 25 low/nonresponding health care workers (anti-HBs titer 〈50 IU/l) after the third inoculation of an experimental hepatitis-B vaccine to determine their immune status (through lymphocyte phenotypes) and HLA type. After application of a fourth inoculation, the seroconverting subjects showed only low anti-HBs levels; three male subjects remained anti-HBs negative. Twelve months after the fourth inoculation only 9 of 25 subjects (36%) maintained anti-HBs titer 〉10 IU/l. Almost all subjects had normal B-cell and CD-4 and CD-8 counts and ratios. Relative to other European populations HLA-A-10 (P〈0.05), B-12 (P〈0.025), CW-5 (P〈0.05), DR-3 (P〈0.025), and DR-5 (P〈0.025) were increased, whereas DR-2 (P〈0.05) was decreased. However, after correction of theP-values for the number of HLA antigens determined, these differences were no longer significant. Furthermore, these HLA types were not the same as those reported in other studies (except for DR-3). We suggest that larger sample sizes or even not yet available immunogenetic markers will be required to prove an “immunogenetic background” in low/nonresponders, if it exists.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 69 (1991), S. 443-445 
    ISSN: 1432-1440
    Schlagwort(e): HIV ; AIDS ; Small intestine ; Microsporidiosis ; Enterocytozoon bieneusi
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Since intestinal microsporidiosis might be of importance in the pathogenesis of gastrointestinal symptoms in patients infected with HIV, we examined duodenal biopsies of HIV-infected patients by electron microscopy. Enterocytozoon bieneusi infection of the small intestine was found in one of 23 patients studied, which gives a 95% confidence interval for the prevalence rate between 0.1 % and 22%. The infected patient was a 24-year-old homosexual male with AIDS who underwent upper endoscopy because of acute epigastric pain, nausea, and vomiting. These symptoms were obviously due to mesenterial Kaposi's sarcoma obstructing the duodenal passage, as was later revealed at autopsy. However, microsporidiosis might have caused the patient's eight-month history of diarrhea and weight loss, since infected cells showed signs of degeneration, and no other pathogens were ever detected in stool or biopsy. Our finding of Enterocytozoon bieneusi infection in a German AIDS patient supports the concept of a worldwide distribution of this parasite; further studies are needed to define its exact prevalence in HIV-infected patients and its pathogenic relevance.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 70 (1992), S. 205-209 
    ISSN: 1432-1440
    Schlagwort(e): Pancreatic amphicrine cells ; Neurotransmitter secretion ; Synaptophysin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Secretory vesicles of both the exocrine and the endocrine pancreas have been isolated and characterized in molecular terms from pancreatic tissue and primary cell cultures. Studies on pancreatic secretory processes could be further facilitated by the use of permanent cell lines that respond to secretory stimuli with a regulated secretory response. We now present biochemical, morphological and secretory studies on the rat pancreatic acinar cell line AR42J. This cell line is characterized by the presence of digestive enzyme-containing dense core vesicles, which are released in response to cholecystokinin. In addition, we present evidence that these cells also contain small neuroendocrine-specific vesicles, as evidenced by the expression of the neuroendocrine-specific vesicle proteins synaptophysin and S.V.2. Corresponding to these mixed exocrine-neuroendocrine features, we also found considerable amounts of the neurotransmitters glycine, glutamine and gammaaminobutyric acid (GABA), as well as the rate-limiting enzyme in GABA synthesis, glutamic acid decarboxylase (GAD) (EC 4.1.1.15) expressed in these cells. We demonstrated a specific uptake mechanism for radioactively-labelled GABA by these cells. In addition, GABA was released from intracellular storage pools by nicotinic receptor stimulation or membrane depolarization. In summary, AR42J cells represent the first amphicrine pancreatic cell line with the combined expression of exocrine and neuroendocrine secretory organelles, both of which follow a regulated secretory pathway in response to various secretory stimuli.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 70 (1992), S. 611-613 
    ISSN: 1432-1440
    Schlagwort(e): Ulcerative colitis ; Cyclosporine ; Inflammatory bowel disease ; Infectious diarrhea ; Immunosuppression
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In recent studies, cyclosporine has been used for the treatment of both ulcerative colitis and Crohn's disease. The results of these studies were variable. We report on a patient who was treated for 6 years with cyclosporine after kidney transplantation. He developed chronic distal colitis with all the features of ulcerative colitis. An infectious etiology of the colitis was carefully excluded. High-dose treatment with methylprednisolone was required to induce remission. This report shows that immunosuppressive therapy with cyclosporine did not prevent the development of ulcerative colitis in this patient.
    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...