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: 1432-1440
    Keywords: Haarzelleukämie ; IFN-Therapie ; Zellmarker ; Thymidineinbau
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In einer multizentrischen „open label“ Studie mit IFN-α2b wurden 85 Patienten mit Haarzell-Leukämie behandelt und ausgewertet. Die Induktionsbehandlung bestand in 2 × 106 E IFN-α2b/m2, 3 × wöchentlich, s.c. Die Ergebnisse zeigen die hohe Effektivität der Substanz, wobei unter den verwendeten Dosierungen geringe, gut tolerierbare und passagere Nebenwirkungen im Sinne eines grippeähnlichen Syndroms auftraten. Die Prozentzahl der Remissionen (CR + PR + MR) nach sechsmonatiger Behandlungszeit lag bei 89%, der Anteil von CR betrug 4%, von PR 69%. An einer kleinen Gruppe (4 Patienten) wurde nach Erzielen einer CR oder PR der Effekt unterschiedlicher Formen der Erhaltungstherapie getestet. Die bisherigen, statistisch noch nicht auswertbaren Resultate sprechen dafür, daß bei Auftreten eines Rückfalles nach Aussetzen oder Verringerung der IFN-Dosis (3 × 106 I.E., s.c., 1 × wöchentlich) durch Wiedereinsetzen oder Erhöhung von IFN-α2 neuerlich Remissionen erzielt werden können. Zur Erhaltung der Remissionen dürfte eine IFN-Dauertherapie notwendig sein. Mittels eines Kurzzeit in vitro Tests werde der Effekt von Interferon α2 auf die Inkorporation von H3-Thymidin und H3-Uridin in Haarzellen bestimmt. Für beide Präkursoren ergab sich keine Hemmung des Einbaues. Allerdings zeigte eine Langzeitinkubation (48 h) einen signifikant vermehrten H3-Uridin Einbau, während der H3-Thymidin Einbau unbeeinflußt blieb. Diese Resultate sprechen gegen einen unmittelbaren antiproliferativen Effekt von IFN-α2 auf Haarzellen, sie weisen aber auf eine Induktion der RNS-Synthese hin. Eine Zellmarker-Analyse der Haarzellen mit monoklonalen Antikörpern vor und während einer 7tägigen in vitro Behandlung mit IFN-α2 ergab keine Änderung des Phänotyps, so daß eine differenzierende Wirkung des IFN auf Haarzellen nicht beobachtet werden konnte.
    Notes: Summary Eighty-five patients with hairy-cell leukemia were treated in a multicentric “open label” study with IFN-α2b and evaluated. Induction therapy was 2 × 106 U IFN-α2b/m2, 3 times a week, s.c. The results show this regimen to be highly effective with only a few tolerable and transient side effects consisting mainly of flu-like symptoms. After 6 months of therapy 4% CR, 69% PR, and 16% MR, were noted. In a small group of four patients who had achieved CR or PR, we tested the effect of varying doses for maintenance therapy. Our preliminary results indicate that a relapse caused by interruption of IFN therapy or dose reduction to 3 × 106 U given once a week, o.c. could be successfully treated by readministration, or escalating the dosage of IFN. It seems that remission maintenance requires long-term treatment with IFN. In a short-term in vitro test we studied the effect of IFN-α2 on the incorporation of3H-thymidine and3H-uridine into hairy cells of five patients. Fort both precursors no appreciable effect was detected. However, after prolonged incubation for 48 h, a significant enhancement of3H-uridine incorporation was observed, while3H-thymidine incorporation remained unaffected. Cell marker analysis performed with monoclonal antibodies before and after incubation of hairy cells with IFN-α2 for up to 7 days did not reveal any change of the phenotype of hairy cells.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Cancer Genetics and Cytogenetics 56 (1991), S. 189-195 
    ISSN: 0165-4608
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Analytical Biochemistry 188 (1990), S. 335-337 
    ISSN: 0003-2697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1432-1777
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. We have determined the canine and feline N-, K-, and H-ras gene sequences from position +23 to +270 covering exons I and II which contain the mutational hot spot codons 12, 13, and 61. The results were used to assess the degree of similarity between ras gene DNA regions containing the critical domains affected in neoplastic disorders in different mammalian species. The comparative analyses performed included human, canine, feline, murine, rattine, and, whenever possible, bovine, leporine (rabbit), porcelline (guinea pig), and mesocricetine (hamster) ras gene sequences within the region of interest. Comparison of feline and canine nucleotide sequences with the corresponding regions in human DNA revealed a sequence similarity greater than 85% to the human sequence. Contemporaneous analysis of previously published ras DNA sequences from other mammalian species showed a similar degree of homology to human DNA. Most nucleotide differences observed represented synonymous changes without effect on the amino acid sequence of the respective proteins. For assessment of the phylogenetic evolution of ras gene family, a maximum parsimony dendrogram based on multiple sequence alignment of the common region of exons I and II in the N-, K-, and H-ras genes was constructed. Interestingly, a higher substitution rate among the H-ras genes became apparent, indicating accelerated sequence evolution within this particular clade. The most parsimonious tree clearly shows that the duplications giving rise to the three ras genes must have occurred before the mammalian radiation.
    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...