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Lum, Hillary D.; Buhtoiarov, Ilia N.; Schmidt, Brian E.; Berke, Gideon; Paulnock, Donna M.; Sondel, Paul M.; Rakhmilevich, Alexander L.
Journal of leukocyte biology, June 2006, Letnik: 79, Številka: 6Journal Article
We have previously demonstrated T cell‐independent antitumor and antimetastatic effects of CD40 ligation that involved natural killer (NK) cells. As CD40 molecules are expressed on the surface of macrophages (Mφ), we hypothesized that Mφ may also serve as antitumor effector cells when activated by CD40 ligation. Progression of subcutaneous NXS2 murine neuroblastomas was delayed significantly by agonistic CD40 monoclonal antibody (anti‐CD40 mAb) therapy in immunocompetent A/J mice, as well as in T and B cell‐deficient severe combined immunodeficiency (SCID) mice. Although NK cells can be activated by anti‐CD40 mAb, anti‐CD40 mAb treatment also induced a significant antitumor effect in SCID/beige mice in the absence of T and NK effector cells, even when noncytolytic NK cells and polymorphonuclear cells (PMN) were depleted. Furthermore, in vivo treatment with anti‐CD40 mAb resulted in enhanced expression of cytokines and cell surface activation markers, as well as Mφ‐mediated tumor inhibition in A/J mice, C57BL/6 mice, and SCID/beige mice, as measured in vitro. A role for Mφ was shown by reduction in the antitumor effect of anti‐CD40 mAb when Mφ functions were inhibited in vivo by silica. In addition, activation of peritoneal Mφ by anti‐CD40 mAb resulted in survival benefits in mice bearing intraperitoneal tumors. Taken together, our results show that anti‐CD40 mAb immunotherapy of mice can inhibit tumor growth in the absence of T cells, NK cells, and PMN through the involvement of activated Mφ.
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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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