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  • 1
    ISSN: 1435-2451
    Keywords: Liver transplantation ; Spontaneous tolerance ; Suppressor cells ; Macrophage replacement ; Lebertransplantation ; Spontantoleranz ; Suppressorzellaktivierung ; Makrophagenaustausch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Nach orthotoper Rattenlebertransplantation in der voll allogenen BN (RT-1n) -LEW (RT-11) Kombination tritt das Phänomen der Spontantoleranz gegen Spenderantigen auf. Es können zwei verschiedene Immunmechanismen dieser Spontantoleranz gezeigt werden: mit Hilfe von adoptiven Transfer-Versuchen können T-Suppressorlymphocyten in der Milz langzeitüberlebender Lebertransplantatempfänger nachgewiesen werden. Sie verlängern - adoptiv in syngene vorbestrahlte Empfänger übertragen - die überlebenszeit von spenderspezifischen (BN) nicht aber Drittstammnieren-transplantaten auf mehr als 100 Tage (Kontrolle: 11 Tage). Zweitens kann der Austausch von Kupfferschen Sternzellen des Transplantats durch empfängereigene Makrophagen im Verlauf der Toleranzentwicklung gezeigt werden. Dieser Austausch immunkompetenter Zellen könnte zur Transplantatadaptation und damit zur Langzeitakzeptanz des allogenen Gewebes beitragen.
    Notes: Summary After orthotopic rat liver transplantation in the fully allogeneic BN (RT-1n) to LEW (RT-11) combination, the phenomenon of spontaneous tolerance of donor antigen occurs. We demonstrate two different immune mechanisms that may account for this process. Using adoptive transfer assays we show the presence of donor-specific T-suppressor lymphocytes in the spleens of long-term surviving liver graft, recipients. These cells prolong - adoptively transferred into irradiated syngeneic hosts — the survival of donor-specific (BN) but not third-party (DA) renal allografts (I00 days vs 1I days in control groups). Secondly, we demonstrate the replacement of Kupffer cells in the graft by recipient macrophages using polymorphic monoclonal antibodies in an immunoperoxidase technique. This may contribute to graft adaptation and thus to long-term graft acceptance.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 343 (1992), S. 59-65 
    ISSN: 1434-601X
    Keywords: 25.70.B ; 25.70.D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The partition of excitation energy between fragments from reactions of 8 A · MeV116Sn with48Ti was studied. The experimental setup rendered possible the unambiguous identification of primary fragments up to total excitation energies of 50 MeV. Neutron mulitplicities of both projectile-like and target-like fragments were experimentally determined as a function of excitation energy. Comparison of these quantities with the results of numerical calculations of sequential decay including rotation of the fragments allowed the determination of excitation energy partition and the associated fluctuations.
    Type of Medium: Electronic Resource
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