Summary
Cancer testis (CT) antigens have received particular attention in cancer immunotherapy. OY-TES-1 is a member of CT antigens. This study was to evaluate OY-TES-1 expression and immunogenicity in hepatocelluar carcinoma (HCC). OY-TES-1 mRNA expression was detected in 56 HCC tissues and 5 normal liver tissues by reverse transcriptase PCR (RT-PCR). Of the 56 cases of HCC tissues tested, 37 cases had tumor and matched adjacent non-cancer tissues and were subjected to both RT-PCR and quantitative real-time PCR. OY-TES-1 protein was subsequently observed on a panel of tissue microarrays. Sera from patients were tested for OY-TES-1 antibody by ELISA. To identify OY-TES-1 capable of inducing cellular immune response, OY-TES-1 protein was used to sensitize dentritic cells and the cytotoxicity effect was measured in vitro. The results showed that OY-TES-1 mRNA was highly expressed in 41 of the 56 (73.21%) HCC tissues, whereas none in 5 normal liver tissues. OY-TES-1 mRNA was frequently expressed not only in HCC tissues (72.97%, 27/37), but also in paired adjacent non-cancer tissues (64.86%, 24/37). But the mean expression level of OY-TES-1 mRNA in HCC tissues was significantly higher than that in adjacent non-cancer tissues (0.76854 vs. 0.09834, P=0.021). Immunohistochemistry showed that OY-TES-1 protein expression was detected in 6 of the 49 cases of HCC tissues, and absent in 9 cases of normal liver and 6 cases of cirrhosis tissues. Seropositivity was detected in 10 of the 45 HCC patients, but not detected in 17 cirrhosis patients and 76 healthy donors. The specific cytotoxic T cells elicited by OY-TES-1 could kill HLA-A2+ HCC cell line which expressed OY-TES-1. The target lysis was mainly HLA class I -dependent and could be blocked by antibodies against monomorphic HLA class I but not HLA class II molecule. In summary, OY-TES-1 expression is up-regulated in HCC tissues and can be recognized by humoral and cellular responses, which suggests that OY-TES-1 is an attractive target for tumor immunotherapy in HCC.
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This work was supported by grants from the National Natural Science Foundation of China (No. 81860445, No. 81960453, No. 81560408, and No. 81660429), Natural Science Foundation of Guangxi Province (No. 2016GXNSFBA380159, No. 2018GXNSFAA281251, No. 2018GXNSFAA050151, No. 2017GXNSFAA198001, No. 2018GXNSFAA281050, and No. 2018GXNSFBA281187), Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor (Guangxi Medical University) and Ministry of Education (No. GK2018-09, No. GKE 2019-08, and No. K2015-TKF03), and Basic Ability Improvement Project for Young and Middle-aged Teachers in Colleges and Universities of Guangxi Province (No. 2018KY0109).
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Luo, B., Yun, X., Li, J. et al. Cancer-testis Antigen OY-TES-1 Expression and Immunogenicity in Hepatocellular Carcinoma. CURR MED SCI 40, 719–728 (2020). https://doi.org/10.1007/s11596-020-2241-x
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DOI: https://doi.org/10.1007/s11596-020-2241-x