The actin regulatory protein HS1 is required for antigen uptake and presentation by dendritic cells.

The actin regulatory protein HS1 is required for antigen uptake and presentation by dendritic cells.
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DOI:
10.4049/jimmunol.1100870
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发表时间:
2011-12-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Burkhardt JK
Burkhardt JK
中科院分区:
其他
文献类型:
--
作者:
Huang Y;Biswas C;Klos Dehring DA;Sriram U;Williamson EK;Li S;Clarke F;Gallucci S;Argon Y;Burkhardt JK

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造血肌动蛋白调节蛋白 HS1 是淋巴细胞中细胞扩散和信号传导所必需的,但 HS1 在抗原呈递中的功能范围尚未得到解决。我们发现来自 HS1−/− 小鼠的树突状细胞 (DC) 能够正常分化,并表现出正常的 LPS 诱导的表面标志物和细胞因子的上调。与 MHC 和共刺激分子的正常表达一致,HS1−/− DC 有效地将 OVA 肽呈递给 CD4+ T 细胞。然而,卵清蛋白的表达存在缺陷。类似地,VSV8 肽向 CD8+ T 细胞的 MHC I 类依赖性呈递正常发生,但 GRP94/VSV8 复合物的交叉呈递有缺陷。抗原摄取途径的分析表明,受体介导的内吞作用需要 HS1,但吞噬作用或巨胞饮作用不需要。 HS1 与动力蛋白 2 相互作用,动力蛋白 2 是一种参与内吞囊泡分裂的蛋白质。然而,HS1−/− DCs 显示内吞内陷数量减少,而动力抑制细胞显示这些内吞中间体的积累。总而言之,这些研究表明 HS1 促进内吞途径的早期步骤,这是 DC 有效呈递外源抗原所必需的。
The hematopoietic actin regulatory protein HS1 is required for cell spreading and signaling in lymphocytes, but the scope of HS1 function in antigen presentation has not been addressed. We show that dendritic cells (DCs) from HS1−/− mice differentiate normally and display normal LPS-induced upregulation of surface markers and cytokines. Consistent with their normal expression of MHC and costimulatory molecules, HS1−/− DCs present OVA peptide efficiently to CD4+ T cells. However, presentation of ovalbumin protein is defective. Similarly, MHC Class I-dependent presentation of VSV8 peptide to CD8+ T cells occurs normally, but cross-presentation of GRP94/VSV8 complexes is defective. Analysis of antigen uptake pathways shows that HS1 is required for receptor-mediated endocytosis, but not for phagocytosis or macropinocytosis. HS1 interacts with dynamin 2, a protein involved in scission of endocytic vesicles. However, HS1−/− DCs showed decreased numbers of endocytic invaginations, whereas dynamin-inhibited cells showed accumulation of these endocytic intermediates. Taken together, these studies show that HS1 promotes an early step in the endocytic pathway that is required for efficient antigen presentation of exogenous antigen by DCs.
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