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  • IL-2, NK activity  (1)
  • Interleukin-1 (IL-1)  (1)
  • 1
    ISSN: 1432-0851
    Keywords: Cyclophosphamide ; IL-2, NK activity ; Cytolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We investigated the in vivo effects of cyclophosphamide (CY) on interleukin-2(IL-2)-induced cytolytic function and spleen cell immunophenotype. Pretreatment of A/J mice with CY (25 mg/kg or 75 mg/kg) i.p. on days −10 and −15 followed by IL-2 (50 000 U i.p. on days 0 to +3) resulted in increased lysis of YAC-1 target cells compared to the group receiving IL-2 without previous CY therapy. In contrast, when CY was given on day -5, the cytotoxicity against YAC-1 was not enhanced. Phenotypic analysis of splenocytes obtained from mice treated with CY on day −10 or −15 revealed a relative decrease in L3T4- and Lyt2-positive T cells. In vivo depletion of natural killer (NK) cells by anti-asialoGM1, prior to IL-2 therapy, abrogated the enhancing effect of CY on cytolysis while in vivo elimination of T cells by anti-L3T4 and anti-Lyt2 monoclonal antibodies did not, indicating that in the absence of T cell antigenic challenge, the increased cytolytic function after CY administration is probably mediated through NK cells. These findings provide evidence that CY may be used more effectively in IL-2-based immunotherapy protocols, if consideration is given to timing of CY and IL-2 administration.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-2592
    Keywords: Interleukin-1 (IL-1) ; IL-6 ; bone marrow transplantation ; lymphoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We evaluated the cytolytic function, phenotypic characteristics, and cytokine levels of 22 patients with non-Hodgkin's lymphoma and 7 with Hodgkin's disease receiving interleukin-la (IL-1α) following autologous bone marrow or peripheral blood stem cell transplantation. IL-1α was given i.v. over 6 hr, between day 0 and day +13 posttransplant. On day +14, cells from patients receiving high-dose IL-1α (3.0 μg/m2/day) had significantly enhanced killing of natural killer (NK)-sensitive and -resistant lymphoma targets compared to those treated with low-dose IL-1α (0.1, 0.3, or 1.0 μg/m2/day). The differences in cytolytic function between the two groups persisted but were not as striking on day +28. Patients receiving higher-dose IL-1α had a significantly increased proportion of CD3+ T cells on days +14 and +28, while the proportion of CD16+ and CD56+ NK cells was decreased compared to those of patients treated with the lower dose. There were no detectable levels of IL-2, interferon-γ, or tumor necrosis factor-α in the plasma of patients receiving IL-1α posttransplant. However, higher-dose IL-1α therapy was associated with significant increases in serum IL-6 levels in comparison to those in patients receiving low-dose IL-1α. IL-1α may increase cytolytic function post-bone marrow transplantation; it remains to be determined, however, whether this would have an impact on decreasing relapse rates of patients undergoing transplantation for lymphoma.
    Type of Medium: Electronic Resource
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