Interferon γ limits the effectiveness of melanoma peptide vaccines

Interferon γ limits the effectiveness of melanoma peptide vaccines
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DOI:
10.1182/blood-2010-08-298117
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发表时间:
2011-01-06
期刊:
影响因子:
20.3
通讯作者:
Celis, Esteban
Celis, Esteban
中科院分区:
医学1区
文献类型:
--
作者:
Cho, Hyun-Il;Lee, Young-Ran;Celis, Esteban

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开发有效的治疗性疫苗来产生肿瘤反应性细胞毒性 T 淋巴细胞 (CTL) 仍然是研究的首要任务。然而,尽管取得了一些有希望的结果,但还没有明确的疫苗可以根除已形成的肿瘤的例子。大多数疫苗是无效的,因为它们产生的 CTL 数量很少,而且荷瘤宿主体内存在大量免疫抑制因子。我们设计了一种肽疫苗,可以在黑色素瘤小鼠模型中产生大量肿瘤反应性 CTL。令人惊讶的是,在存在干扰素γ(IFNγ)(一种可以提供治疗益处的细胞因子)的情况下,CTL 肿瘤识别和抗肿瘤作用会降低。暴露于 IFN γ 的肿瘤通过诱导大量非同源主要组织相容性复合物 I 类分子来逃避 CTL,这限制了 T 细胞的激活和效应器功能。我们的结果表明,在 IFN γ 的抑制活性减弱的情况下,肽疫苗可以根除已形成的大肿瘤。 (血。2011;117(1):135-144)
The development of effective therapeutic vaccines to generate tumor-reactive cytotoxic T lymphocytes (CTLs) continues to be a top research priority. However, in spite of some promising results, there are no clear examples of vaccines that eradicate established tumors. Most vaccines are ineffective because they generate low numbers of CTLs and because numerous immunosuppressive factors abound in tumor-bearing hosts. We designed a peptide vaccine that produces large numbers of tumor-reactive CTLs in a mouse model of melanoma. Surprisingly, CTL tumor recognition and antitumor effects decreased in the presence of interferon gamma (IFN gamma), a cytokine that can provide therapeutic benefit. Tumors exposed to IFN gamma evade CTLs by inducing large amounts of noncognate major histocompatibility complex class I molecules, which limit T-cell activation and effector function. Our results demonstrate that peptide vaccines can eradicate large, established tumors in circumstances under which the inhibitory activities of IFN gamma are curtailed. (Blood. 2011;117(1):135-144)