Retargeting NK-92 for anti-melanoma activity by a TCR-like single-domain antibody.
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| Abstract |
The efficacy of immunotherapy based on natural killer (NK) cells is hampered by intrinsic non-specific cytotoxicity and insufficient activation of NK cells. Here, we confer the T-cell receptor-like (TCR-like) specificity on NK cells, taking advantage of both the innate and adaptive immune arms of the immune response to generate enhanced anti-melanoma activity. The TCR-like antibody (Ab) GPA7 was selected against melanoma-associated gp100/human leukocyte antigen (HLA)-A2 complex and then fused to intracellular domain of CD3-ζ chain. This fusion construct was incorporated into NK-92MI cell line and expressed as a chimeric antigen receptor on the surface of the cell. The anti-tumour activity of the transgenic NK-92MI-GPA7-ζ cell line was assessed against melanoma in vitro and in vivo. The engineered NK-92MI-GPA7-ζ cells could recognize melanoma cells in the context of HLA-A2 and showed enhanced killing of both melanoma cell lines and primary melanoma. Furthermore, adoptively transferred NK-92MI-GPA7-ζ cells significantly suppressed the growth of human melanoma in a xenograft model in mice. Collectively, these results demonstrate that the TCR-like Ab, GPA7, could redirect NK cells to target the intracellular antigen gp100 and enhance anti-melanoma activity, providing a promising immunotherapeutic strategy to prevent and treat melanoma.
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| Authors | Ge Zhang, Rongzhi Liu, Xuekai Zhu, Lei Wang, Juan Ma, Huamin Han, Xiaomin Wang, Ganlin Zhang, Wen He, Wei Wang, Changzhen Liu, Shenghua Li, Meiyi Sun, Bin Gao |
| Journal | Immunology and cell biology (Immunol Cell Biol) 2013 Nov-Dec Vol. 91 Issue 10 Pg. 615-24 ISSN: 1440-1711 [Electronic] United States |
| PMID | 24100387 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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