In vivo role of ER-associated peptidase activity in tailoring peptides for presentation by MHC class Ia and class Ib molecules.

In vivo role of ER-associated peptidase activity in tailoring peptides for presentation by MHC class Ia and class Ib molecules.
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DOI:
10.1084/jem.20052271
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发表时间:
2006-03-20
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Van Kaer L
Van Kaer L
中科院分区:
其他
文献类型:
--
作者:
Yan J;Parekh VV;Mendez-Fernandez Y;Olivares-Villagómez D;Dragovic S;Hill T;Roopenian DC;Joyce S;Van Kaer L

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内质网 (ER) 相关氨肽酶 (ERAP)1 参与主要组织相容性复合物 (MHC) I 类分子呈递的肽的最终蛋白水解加工。为了评估 ERAP1 的体内作用,我们培育了 ERAP1 缺陷小鼠。在这些动物中,Ia类分子H-2Kb和H-2Db以及Ib类分子Qa-2的细胞表面表达显着降低。尽管来自突变动物的细胞表现出向 Kb-、Db- 或 Qa-1b 限制性 CD8+ 细胞毒性 T 细胞呈递几种自身和外来抗原的能力降低,但某些抗原的呈递不受影响或显着增强。与这些发现一致的是,小鼠对 I 类呈递抗原产生了有缺陷的 CD8+ T 细胞反应。这些发现揭示了 ER 相关肽酶活性在调整肽以供 MHC Ia 类和 Ib 类分子呈递中的重要体内作用。
Endoplasmic reticulum (ER)-associated aminopeptidase (ERAP)1 has been implicated in the final proteolytic processing of peptides presented by major histocompatibility complex (MHC) class I molecules. To evaluate the in vivo role of ERAP1, we have generated ERAP1-deficient mice. Cell surface expression of the class Ia molecules H-2Kb and H-2Db and of the class Ib molecule Qa-2 was significantly reduced in these animals. Although cells from mutant animals exhibited reduced capacity to present several self- and foreign antigens to Kb-, Db-, or Qa-1b–restricted CD8+ cytotoxic T cells, presentation of some antigens was unaffected or significantly enhanced. Consistent with these findings, mice generated defective CD8+ T cell responses against class I–presented antigens. These findings reveal an important in vivo role of ER-associated peptidase activity in tailoring peptides for presentation by MHC class Ia and class Ib molecules.
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