Identification of natural antigenic peptides of a human gastric signet ring cell carcinoma recognized by HLA-A31-restricted cytotoxic T lymphocytes.

Identification of natural antigenic peptides of a human gastric signet ring cell carcinoma recognized by HLA-A31-restricted cytotoxic T lymphocytes.
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HLA-A31 限制性细胞毒性 T 淋巴细胞识别的人胃印戒细胞癌天然抗原肽的鉴定。

DOI:
10.4049/jimmunol.163.5.2783
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发表时间:
1999
影响因子:
4.4
通讯作者:
N. Sato
N. Sato
中科院分区:
医学2区
文献类型:
--
作者:
K. Suzuki;H. Sahara;Y. Okada;T. Yasoshima;Y. Hirohashi;Y. Nabeta;I. Hirai;T. Torigoe;S. Takahashi;A. Matsuura;N. Takahashi;A. Sasaki;M. Suzuki;J. Hamuro;H. Ikeda;Y. Wada;K. Hirata;K. Kikuchi;N. Sato

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已鉴定出由CD 8 + CTL识别的人黑素瘤的肽,但非黑素瘤肿瘤的肽的性质仍有待阐明。以前,我们建立了胃印戒细胞癌HST-2和HLA-A31(A*31012)限制性自体CTL克隆,TcHST-2。在本研究中,我们确定了HST-2细胞的天然抗原肽。将酸提取的Ag的纯化制剂提交给肽测序仪,并且命名为F4.2(Tyr-Ser-Trp-Met-Asp-Ile-Ser-Cys-Trp-Ile)的肽似乎具有免疫原性。为了进一步证实F4.2的抗原性,我们构建了一个编码腺病毒E3的小基因表达载体(pF4.2ss),E3是一个19-kDa的蛋白信号序列加上F4.2。将pF4.2ss小基因导入HST-2和HLA-A31(+)同种异体肿瘤细胞中,分别明显增强和诱导TcHST-2的反应性。此外,当将F4.2 C端缺失肽的合成肽脉冲至HST-2细胞时,F4.2-9(九聚体)而不是F4.2-8或F4.2-7(分别为八聚体或七聚体)增强TcHST-2的反应性,这表明N端第九Trp可能是T细胞表位。当使用合成的取代肽以及编码在F4.2的第九位具有Ala或Arg的F4.2变体肽的小基因时,这通过缺乏抗原性来证实。同时表明第6位Ile对HLA-A31分子的结合至关重要。因此,我们的数据表明,F4.2可能作为一个HLA-A31限制性的天然抗原肽识别的CTL。
Peptides of human melanomas recognized by CD8+ CTLs have been identified, but the nature of those of nonmelanoma tumors remains to be elucidated. Previously, we established a gastric signet ring cell carcinoma HST-2 and HLA-A31 (A*31012)-restricted autologous CTL clone, TcHST-2. In the present study, we determined the natural antigenic peptides of HST-2 cells. The purified preparation of acid-extracted Ags was submitted to the peptide sequencer, and one peptide, designated F4.2 (Tyr-Ser-Trp-Met-Asp-Ile-Ser-Cys-Trp-Ile), appeared to be immunogenic. To confirm the antigenicity of F4.2 further, we constructed an expression minigene vector (pF4.2ss) coding adenovirus E3, a 19-kDa protein signal sequence plus F4.2. An introduction of pF4.2ss minigene to HST-2 and HLA-A31(+) allogeneic tumor cells clearly enhanced and induced the TcHST-2 reactivity, respectively. Furthermore, when synthetic peptides of F4.2 C-terminal-deleted peptides were pulsed to HST-2 cells, F4.2-9 (nonamers), but not F4.2-8 or F4.2-7 (octamer or heptamer, respectively), enhanced the reactivity of TcHST-2, suggesting that the N-terminal ninth Trp might be a T cell epitope. This was confirmed by lack of antigenicity when using synthetic substituted peptides as well as minigenes coding F4.2 variant peptides with Ala or Arg at the ninth position of F4.2. Meanwhile, it was indicated that the sixth position Ile was critically important for the binding to HLA-A31 molecules. Thus, our data indicate that F4.2 may work as an HLA-A31-restricted natural antigenic peptide recognized by CTLs.
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