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  • 1
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Eleven non-producer lines were tested. Three were derived from Burkitfs lymphoma (Raji12, Namalwa13, Rael14), three were independently established somatic cell hybrids of Raji and Namalwa (RN2, RN17, RN21) (ref. 15), four were EBV-carrying lymphoblastoid cell lines of non-neoplastic origin (303L ...
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0584
    Keywords: Bone marrow transplantation ; Epstein ; Barr virus ; Infection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The relationship between Epstein-Barr virus (EBV) and the host is profoundly disturbed by allogeneic bone marrow transplantation (BMT) because EBV resides in the recipient's hematopoietic system, which has to be destroyed in the majority of cases, and in the donor's hematopoietic system, i.e., the marrow graft. We have shown that EBV may be eradicated from some BMT recipients and that the virus may be transferred with the marrow graft. During the immediate post-transplant period oropharyngeal EBV excretion may occur which, by infecting passing B lymphocytes, may act as co-factor for acute graft-versus-host disease and help the virus to survive, despite the temporary depletion of its reservoir. The coexistence of totally different EBV strains in BMT recipients but not in healthy, untransfused controls, suggests that superinfection may by possible in case of immunodeficiency; alternatively, transfer of the virus by the reservoir itself (the B lymphocytes) might be the only effective route for superinfection. The generation of ‘variant’ strains during viral replication may form the basis of the vast polymorphism between wild-type EBV isolates in the population.
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  • 3
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary.  Epstein-Barr virus (EBV) episomal DNA is extensively methylated in Burkitt lymphoma derived cell lines. In this study we examined whether lytic viral cycle reactivation is dependent on demethylation of critical viral genes. Viral replication was induced in the Burkitt’s lymphoma cell line Daudi by the combination of 12-O-tetradecanoylphorbol-13-acetate (TPA) and sodium-butyrate. Two regions necessary for EBV replication, the BZLF1 immediate early region and the origin of lytic cycle replication (ori Lyt) were demethylated during the early phase of the lytic virus cycle. Demethylation was observed while production of new (unmethylated) viral DNA was blocked by phosphonoformic acid (PFA). This suggests that demethylation, which may be instrumental for the onset of the lytic cycle, is an active process independent of viral DNA repli- cation.
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  • 4
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 56 Patienten mit klinisch und durch Laborparameter gesicherter infektiöser Mononukleose und Krankheitsdauer von nicht mehr als sieben Tagen wurde im Rahmen einer Doppelblindstudie entweder eine orale Therapie mit 800 mg Aciclovir fünfmal täglich oder mit Placebo über sieben Tage durchgeführt. Bei allen Patienten wurden sechs Monate lang klinische, virologische und immunologische Parameter überwacht. Unter der Therapie war bei 36 überprüften Patienten die Ausscheidung von Epstein-Barr-Virus signifikant vermindert (p〈0,001). Eine Woche nach Therapieende war die Virusproduktion im Oropharynx jedoch wieder so ausgeprägt wie vor der Therapie. Bei Aufnahme in die Studie wurde bei 35 der 36 Patienten der Therapiegruppe Epstein-Barr-Virus nachgewiesen, sechs Monate nach Therapieende bei 28 Patienten. Ein Einfluß der Therapie auf den klinischen Verlauf der Erkrankung konnte nicht festgestellt werden. Die spezifische Antikörperantwort auf das Virus war ebenfalls unbeeinflußt. 180 Tage nach Therapieende fand sich bei vier der mit Aciclovir behandelten und bei sechs der Patienten der Kontrollgruppe eine signifikante Verminderung des spontanen Wachstums von mit Epstein-Barr-Virus infizierten Lymphozytenin vivo (p〈0,001). Bei drei weiteren Patienten mit schwersten klinischen Symptomen mit Atemwegsverlegung und/oder disseminierter intravasaler Koagulopathie wurde eine kombinierte Therapie mit dreimal täglich 10 mg Aciclovir/kg i. v. und 0,7 mg Prednisolon/kg täglich über zehn Tage durchgeführt. Die Virusausscheidung sistierte vorübergehend unter der Behandlung, kehrte jedoch innerhalb einer Woche nach Therapie wieder zu den Anfangswerten zurück. Die Kombinationstherapie führte bei zwei der Patienten mit Atemwegsobstruktion zu einer dramatischen Besserung des Pharynxödems und des Allgemeinzustandes, bei dem Patienten mit intravasaler Koagulopathie war die Wirkung sehr viel weniger ausgeprägt.
    Notes: Summary Fifty-six patients with a clinical and laboratory diagnosis of infectious mononucleosis who had not been ill for more than seven days, were randomised for peroral treatment with acyclovir (800 mg five times daily) or placebo for seven days in a double blind trial. Clinical, virological and immunological parameters were monitored in each patient for six months. During treatment, shedding of Epstein-Barr virus' as assessed in 36 patients, was significantly reduced (p〈0.001). However, virus production in the oropharynx returned to pre-treatment levels one week after the cessation of therapy. Virus was detected in 35 patients at enrollment and in 28 of 36 patients at the six-month control. No effect on the clinical course of the disease was noticed. The virus-specific antibody response was also unaffected. A significant reduction in spontaneous outgrowth ofin vivo Epstein-Barr virus-infected B-lymphocytes was found at 180 days after treatment in four acyclovir-treated patients compared to six controls (p〈0.001). In another three patients with over-whelming clinical symptoms causing airway obstruction and/or disseminated intravascular coagulopathy, treatment with intravenous acyclovir (10 mg/kg three times daily) was combined with prednisolone (0.7 mg/kg daily) for ten days. Virus shedding ceased transiently during treatment, but returned to initial levels within one week. A dramatic clinical effect on the pharyngeal oedema and general health of the two patients with airway obstruction was noticed, but was much less evident in a patient with intravascular coagulopathy.
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