Chimeric NKG2D CAR-Expressing T Cell-Mediated Attack of Human Ovarian Cancer Is Enhanced by Histone Deacetylase Inhibition

被引:84
作者
Song, De-Gang [1 ]
Ye, Qunrui [1 ]
Santoro, Stephen [1 ]
Fang, Chongyun [1 ]
Best, Andrew [1 ]
Powell, Daniel J., Jr. [1 ,2 ]
机构
[1] Univ Penn, Dept Obstet & Gynecol, Ovarian Canc Res Ctr, Philadelphia, PA 19104 USA
[2] Univ Penn, Dept Pathol & Lab Med, Abramson Canc Ctr, Philadelphia, PA 19104 USA
关键词
TUMOR-INFILTRATING LYMPHOCYTES; ADOPTIVE TRANSFER; CD28; COSTIMULATION; ANTITUMOR-ACTIVITY; LIGANDS; SURVIVAL; IMMUNOTHERAPY; CYTOTOXICITY; PERSISTENCE; RECEPTORS;
D O I
10.1089/hum.2012.143
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
NKG2D ligands (NKG2DLs) are widely expressed on ovarian cancers to various degrees, making them attractive targets for immunotherapy. Here, we applied a chimeric antigen receptor (CAR) approach for the targeting of NKG2DLs expressed on human ovarian cancer cells and evaluated the impact of pharmacological upregulation of NKG2DLs on immune recognition. Various NKG2DLs, including MICA/B and ULBP-1, -2, -3, and -4, were expressed at various levels on the surface of all established ovarian cancer cell lines and primary ovarian cancer samples tested. To redirect human T cells against NKG2DLs, an NKG2DL-specific CAR was generated by fusing the extracellular domain of the NKG2D receptor to the 4-1BB costimulatory and CD3-zeta chain signaling domains. In vitro expansion of chimeric NKG2D CAR T cells was delayed compared with untransduced T cells and control CAR T cells; the likely result of fratricide among activated T cells expressing NKG2DLs. However, NKG2D CAR T cells did expand and were selectively enriched during prolonged culture. In coculture, CD4(+) and CD8(+) NKG2D CAR T cells specifically recognized and killed NKG2DL-expressing ovarian cancer cell lines but not NKG2DL-negative cells. Notably, pretreatment of ovarian cancer cells expressing moderate to low levels of NKG2DLs with the histone deacetylase inhibitor sodium valproate (VPA) upregulated NKG2DL cell surface expression and consequently enhanced their immune recognition by chimeric NKG2D CAR T cells. Our results demonstrate that VPA-induced upregulation of NKG2DL expression enhances the immune recognition of ovarian cancer cells by engineered NKG2D CAR T cells, and rationalizes the use of VPA in combination with NKG2DL-targeted immunotherapy in ovarian cancer.
引用
收藏
页码:295 / 305
页数:11
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