Autophagy creates a CTL epitope that mimics tumor-associated antigens.

Autophagy creates a CTL epitope that mimics tumor-associated antigens.
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DOI:
10.1371/journal.pone.0047126
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Kuzushima K
Kuzushima K
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Demachi-Okamura A;Torikai H;Akatsuka Y;Miyoshi H;Yoshimori T;Kuzushima K

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负责处理肿瘤相关抗原并将其呈递给CTL的详细机制仍有待充分阐明。在这项研究中,我们证明了一个独特的CTL表位产生的普遍存在的蛋白嘌呤霉素敏感的氨基肽酶,这是通过HLA-A24白血病和胰腺癌细胞,但不对正常的成纤维细胞或EBV转化的B淋巴母细胞。该表位的产生需要蛋白酶体消化和从内质网到高尔基体的运输,并且对氯喹诱导的内体/溶酶体内的酸化抑制敏感。表位释放依赖于组成性活性自噬,如自噬体标记物LC 3的免疫细胞化学以及靶向两种不同自噬相关基因的RNA干扰所证实的。因此,当通过涉及自噬的独特机制处理时,普遍表达的蛋白质可能是特异性肿瘤相关抗原的来源。
The detailed mechanisms responsible for processing tumor-associated antigens and presenting them to CTLs remain to be fully elucidated. In this study, we demonstrate a unique CTL epitope generated from the ubiquitous protein puromycin-sensitive aminopeptidase, which is presented via HLA-A24 on leukemic and pancreatic cancer cells but not on normal fibroblasts or EBV-transformed B lymphoblastoid cells. The generation of this epitope requires proteasomal digestion and transportation from the endoplasmic reticulum to the Golgi apparatus and is sensitive to chloroquine-induced inhibition of acidification inside the endosome/lysosome. Epitope liberation depends on constitutively active autophagy, as confirmed with immunocytochemistry for the autophagosome marker LC3 as well as RNA interference targeting two different autophagy-related genes. Therefore, ubiquitously expressed proteins may be sources of specific tumor-associated antigens when processed through a unique mechanism involving autophagy.
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