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  • 1
    ISSN: 1432-1963
    Keywords: Schlüsselwörter HHV-6-Hodgkin-Lymphom ; Kikuchi-Lymphadenitis ; Onkogene ; Antionkogene ; Apoptose ; Key words HHV-6-Hodgkin's disease ; Kikuchi lymphadenitis ; Oncogens ; Antioncogenes ; Apoptosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary HHV-6 infected immature T (HSB 2) and Hodgkin (HDLM 2) cells and biopsy tissues from lymph nodes of patients with Hodgkin's disease (HD) and Kikuchi lymphadenitis (KL) were studied immunohistologically for virus antigen expression and for the oncogene/anti-oncogene products ras, bcl-2 and p 53. Cell proliferation and cell death were tentatively monitored in tissue culture by PCNA staining, by viability testing and in situ end labeling of fragmented DNA. PCNA was also used in biopsy samples. KL is characterized by high incidences of focal cell death (i. e. histiocytic necrotizing lymphadenitis), while HD is apparently more a proliferative disease. The techniques used revealed no significant differences in the cellular expression of viral DNA or antigens among cell lines, HD or KL. The HDLM 2 cell line with the superior survival after HHV-6 infection showed a significantly lower expression of p 53 and PCNA than HSB 2 cells. Biopsy samples from patients with KL did not express p 53, and ras and PCNA were observed in fewer cells than in HD. Bcl-2, however, was significantly more frequently seen than in HD. The interpretation of the data is difficult; they suggest that there are additional regulatory influences in control of cell proliferation and cell death, such as cytokines and growth factors, which are altered after viral infection. Also, virus-induced cell death probably includes other mechanisms besides apoptosis, such as cell damage caused by oxygen radicals.
    Notes: Zusammenfassung HHV-6-infizierte Zellkulturlinien (HSB 2 T-Zellen; HDLM 2-Hodgkin-Zellen) sowie Biopsieproben von HHV-6-positiven Hodgkin(HD)- und Kikuchi-Lymphomen (KL) wurden immunhistologisch auf eine Expression der Genprodukte ras, bcl-2 und p 53 untersucht und die Ergebnisse korreliert mit Markern der Zellproliferation und mit Zeichen apoptotischen Zelltods. Die Ergebnisse der Zellkulturuntersuchungen sind eingeschränkt beurteilbar, da etablierte Zellinien bereits transformiert sind. Dennoch zeigen die Zellen mit geringerer Apoptoserate (HDLM 2) eine 10 fach geringere p 53-Expression und eine um die Hälfte verminderte PCNA-Anfärbung der Zellen. In den Biopsien des stärker nekrotisierenden KL war lediglich 1/6 bis 1/20 der ras-Expression des HD nachweisbar, p 53 fehlte gänzlich, während bcl-2 deutlich gegenüber dem HD gesteigert war. PCNA-positive Zellen waren beim HD etwa 3 mal so häufig, wie beim KL. Es fanden sich keine signifikanten Unterschiede in der Virus-DNS oder Antigenexpression bei den verschiedenen untersuchten Zellen. Die Ergebnisse lassen vermuten, daß weitere exogene Faktoren wie Zytokine und Wachstumsfaktoren in den Regelmechanismus für virusinduzierte Zellproliferation und Apoptose eingreifen, und daß neben der Apoptose andere Formen der viralen Zellyse vorkommen.
    Type of Medium: Electronic Resource
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