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  • 1995-1999  (3)
  • radioimmunoassay  (2)
  • Angioneogenesis  (1)
  • Creutzfeldt-Jakob disease
  • General Chemistry
  • 1
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Cholesteatom ; Perimatrix ; Histologie ; Wachstumsfaktoren ; b-FGF ; Gefäßneubildung ; Key words Cholesteatoma ; Perimatrix ; Histology ; Basic fibroblast growth factor ; Angioneogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The growth of a cholesteatoma requires angioneogenesis in the connective tissue of the perimatrix. Angioneogenesis is also needed for wound healing as a host response to tissue injury. Normal wound repair is conducted through a wide number of growth factors. Basic fibroblast growth factor (b-FGF) plays a pivotal role in wound repair. This cytokine exerts its effects through stimulation of a wide range of target cells. B-FGF is chemotactic and mitogenic for fibroblasts, endothelial cells and keratinocytes. In addition, b-FGF can stimulate the production of collagenase and plasminogen activators to enhance fibroblast proliferation and angioneogenesis. Its necessity for normal wound repair has been confirmed by several workers. Method: In order to demonstrate angioneogenesis in the cholesteatoma perimatrix the distribution of b-FGF as the pivotal cytokine of the process was investigated in the perimatrix of 18 cholesteatoma specimens. Results: B-FGF could be observed in 12 of 18 specimens (66%) in close approximation to histological signs of inflammation and wound healing. Areas with b-FGF also exhibited proliferation of the covering squamous epithelium. Cholesteatoma matrix tissue without inflammation or any sign of wound healing did not express b-FGF (6 of 18). Conclusion: Histological changes and distribution pattern of b-FGF in the perimatrix of cholesteatoma in the present study indicate that the perimatrix cells and substances of the wound healing cascade may play an important role in cholesteatoma development, angiogenesis and growth.
    Notes: Zusammenfassung Entwicklung und Wachstum eines Cholesteatomsackes erfordern Gefäßneubildung in der ernährenden Perimatrix. Im Säugetierorganismus beeinflußt der „basic fibroblast growth factor” (b-FGF) die Angioneogenese bei normalem Größenwachstum und der Wundheilung. Dieses Zytokin wird bei der Wundheilung von Fibroblasten und Makrophagen freigesetzt, Zellen die in großer Zahl in der Perimatrix des Cholesteatoms vorkommen. Der B-FGF wurde bereits im Cholesteatomgewebe untersucht. Bisher ist unklar, wann b-FGF in der Cholesteatomperimatrix nachweisbar wird. Methode und Ergebnisse: Zur Untersuchung wurde der b-FGF in der Perimatrix des Cholesteatomsackes immunhistologisch dargestellt. Zur Auswertung gelangten 18 intraoperativ gewonnene Gewebeproben von klinisch unterschiedlichen Cholesteatomen. Der b-FGF konnte in 12 (66%) der Proben nachgewiesen werden. Dabei wurde b-FGF nicht kontinuierlich exprimiert, sondern war nur in Umgebung von entzündlichem Granulationsgewebe und Wundheilungsvorgängen zu beobachten. Das unmittelbar anliegende Epithel der Matrix zeigte deutliche Hyperproliferationszeichen. In dünner Matrix, ohne erkennbare Invasion von Entzündungszellen, war kein b-FGF nachweisbar. Schlußfolgerung: Die Ergebnisse lassen einen Einfluß von Wundheilungsvorgängen in der Perimatrix auf das Wachstum, die Gefäßneubildung und das Verhalten eines Cholesteatomsackes wahrscheinlich werden.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 30 (1995), S. 165-176 
    ISSN: 0739-4462
    Keywords: Lepidoptera ; radioimmunoassay ; enzyme immunoassay ; equilibrium dialysis ; monoclonal antibody ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Numerous studies have demonstrated regulation of specific lepidopteran proteins by pharmacological doses of insect juvenile hormone (JH). In this study, topical application of a 1 pg dose of JH I to fourth stadium larvae of the black (bl) mutant strain of the tobacco hornworm, Manduca sexta, induced a 50% increase in the titer of hemolymph juvenile hormone binding protein (hJHBP). Radioimmunoassay confirmed that JH titers were lower in bl larvae than in wild-type larvae at the time of JH treatment. Enzyme immunoassay analysis of hJHBP titers demonstrated that regulation by JH I was dose-dependent at doses up to 10 pg and that the response was saturated above 100 pg. Western blotting and equilibrium dialysis confirmed these results and demonstrated that hJHBP from bl larvae had the same molecular mass and displayed the same affinity for JH I as hJHBP isolated from wild-type larvae. Time course studies showed that regulation was complex: 1 2 h after JH I treatment, hJHBP titers were twofold lower in treated than in control bl larvae, while 44 h after treatment they were twofold higher. JH I regulation of hJHBP titers in bl larvae was independent of changes in total hemolymph protein. © 1995 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 30 (1995), S. 295-306 
    ISSN: 0739-4462
    Keywords: radioimmunoassay ; JH I ; JH II ; JH III ; hemolymph ; insect hormone ; Manducasexta sexta ; Hyalophora cecropia ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Recent refinements in juvenile hormone radioimmunoassay technology now make this method significantly more sensitive and easier to use. Rabbit poly-clonal antisera against (10R) JH III and racemic JH II have been developed to determine hemolymph hormone titers in the low picogram range. The antisera display minimal cross-reactivity with JH metabolites, JH analogs, and hemolymph lipids. One antiserum recognizes racemic JH I, II, and (10R) III almost equivalently, exhibiting 50% displacement between 100 and 130 pg per tube. Another antiserum is JH II-specific and exhibits 50% displacement at 35 pg per tube. Assay sensitivity has been enhanced by using (10R,11S) [methyl-3H]-JH II of very high specific activity (〉 80 Ci/mmol) generated with Hyalophora cecropia accessory gland S-adenosylmethionine transferase and S-[methyl-3H]-adenosyl-L-methionine. Preparation of biological samples has been simplified with overall recoveries of JH from hemolymph ranging between 60 and 75%. © 1995 Wiley-Liss, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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