期刊
FRONTIERS IN IMMUNOLOGY
卷 9, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fimmu.2018.00814
关键词
human gamma delta T cells; human natural killer cells; human epidermal growth factor receptor 2; trastuzumab; bispecific antibody; tribody; cancer; CD16
类别
资金
- Werner Klara-Kreitz Stiftung
- DFG [Ka502/16-1, EXC 306 CL VII]
- Mildred-Scheel Professorship program of the Deutsche Krebshilfe
An enhanced expression of human epidermal growth factor receptor 2 (HER2, ErbB2) often occurs in an advanced stage of breast, ovarian, gastric or esophageal cancer, and pancreatic ductal adenocarcinoma (PDAC). Commonly, HER2 expressionis associated with poor clinical outcome or chemoresistance in ovarian and breast cancer patients. Treatment with humanized anti-HER2 monoclonal antibodies, such as trastuzumab or pertuzumab, has improved the outcome of patients with HER2-positive metastatic gastric or breast cancer, but not all patients benefit. In this study, the bispecific antibody [(HER2)(2)xCD16] in the tribody format was employed to re-direct CD16-expressing gamma delta T lymphocytes as well as natural killer (NK) cells to the tumor-associated cell surface antigen HER2 to enhance their cytotoxic anti-tumor-activity. Tribody [(HER2)(2)xCD16] comprises two HER2-specific single chain fragment variable fused to a fragment antigen binding directed to the CD16 (Fc gamma RIII) antigen expressed on gamma delta T cells and NK cells. Our results revealed the superiority of tribody [(HER2)(2)xCD16] compared to trastuzumab in triggering gamma delta T cell and NK cell-mediated lysis of HER2-expressing tumor cells, such as PDAC, breast cancer, and autologous primary ovarian tumors. The increased efficacy of [(HER2)(2)xCD16] can be explained by an enhanced degranulation of immune cells. Although CD16 expression was decreased on gamma delta T cells in several PDAC patients and the number of tumor-infiltrating NK cells and gamma delta T cells was impaired in ovarian cancer patients, [(HER2)(2)xCD16] selectively enhanced cytotoxicity of cells from these patients. Here, unique anti-tumor properties of tribody [(HER2)(2)xCD16] are identified which beyond addressing HER2 overexpressing solid tumors may allow to treat with similar immunoconstructs combined with the adoptive transfer of gamma delta T cells and NK cells refractory hematological malignancies. A major advantage of gamma delta T cells and NK cells in the transplant situation of refractory hematological malignancies is given by their HLA-independent killing and a reduced graft-versus-host disease.
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