Phagocytosis of breast cancer cells mediated by anti-MUC-1 monoclonal antibody, DF3, and its bispecific antibody

被引:0
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作者
Akewanlop, C
Watanabe, M
Singh, B
Walker, M
Kufe, DW
Hayes, DF
机构
[1] Georgetown Univ, Med Ctr, Lombardi Canc Ctr, Breast Canc Program, Washington, DC 20007 USA
[2] Georgetown Univ, Med Ctr, Dept Pathol, Washington, DC 20007 USA
[3] Harvard Univ, Sch Med, Dana Farber Canc Inst, Boston, MA 02115 USA
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R73 [肿瘤学];
学科分类号
100214 ;
摘要
Human epithelial mucin, MUC-1, is commonly expressed in adenocarcinoma including 80% of breast cancers, erbB-2 is overexpressed in similar to 30% of breast cancers. Expression of MUC-1 and erbB-2 may be partially overlapping but discoordinate, Therefore, combined use of antibodies directed against these two antigens might increase the number of patients who benefit from immunotherapy, Monoclonal antibody (MAb) DF3 recognizes the MUC-1 tandem repeat, We investigated phagocytosis and cytolysis of cultured human breast cancer cells by monocyte-derived macrophages mediated by MAb DF3 and its bispecific antibody (BsAb) DF3xH22 with the second epitope directed against the Fe component of phagocytic cells. Purified monocytes from healthy donors were cultured with granulocyte macrophage colony-stimulating factor with or without IFN-gamma, antibody-dependent cellular phagocytosis (ADCP) and antibody-dependent cellular cytotoxicity (ADCC) assays were performed with these macrophages and MUC-1-expressing target cells (ZR75-1) in the presence of MAb DF3 and BsAb DF3xH22. ADCP was measured by two-color fluorescence flow cytometry using PKH2 (green fluorescent dye) and R-phytoerythrin (RPE) (red)-conjugated MAb against human CD14 and CD11b and was confirmed by confocal microscopy, ADCC was measured by Cr-51 release assay. Immunohistochemical staining studies of MUG-I and erbB-2 were performed on 67 primary breast cancer tissues. Expression of MUG-I and erbB-2 was partially overlapping but discoordinate in 67 consecutive breast cancers. Both MAb DF3 and BsAb DF3xH22 mediated ADCP, However, ADCP mediated by MAb DF3 was greater than that mediated by BsAb DF3xH22. ADCC as detected by Cr-51 release was not seen with either antibody. The addition of IFN-gamma to monocyte-derived macrophage cultures inhibited ADCP compared to granulocyte macrophage colony-stimulating factor alone. Given the partially overlapping but discoordinate expression of MUG-I and erbB-2 in breast cancer, therapy directed toward both antigens should be considered. MAb DF3 and the BsAb DF3xH22, can effectively mediate phagocytosis of MUG-I-expressing target cells. Further investigations are needed to determine whether this antibody-induced phagocytosis results in long-term specific T-cell activation against MUC-1.
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页码:4061 / 4065
页数:5
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