Influence of hypoxia-inducible factor 1α on dendritic cell differentiation and migration.

Influence of hypoxia-inducible factor 1α on dendritic cell differentiation and migration.
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DOI:
10.1002/eji.201142053
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发表时间:
2012-05
影响因子:
5.4
通讯作者:
Förster I
Förster I
中科院分区:
医学3区
文献类型:
--
作者:
Köhler T;Reizis B;Johnson RS;Weighardt H;Förster I

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树突状细胞(Dendritic cell,DC)是免疫系统的重要哨兵,并且经常驻留在低氧可用性的区域,特别是在炎症过程中。低氧诱导转录因子(HIF)1α作为细胞适应低氧浓度的一部分,负责基因表达的主要改变。在这项研究中,我们产生了在DCs中有条件缺失HIF 1 α的小鼠。当在低氧环境中生长时,来自WT和条件突变小鼠的骨髓来源的DC表达升高的主要组织相容性复合物II类和CD 86水平,而细胞因子白细胞介素(IL)-12 p70,IL-10,IL-6,TNF-α,IL-1β和IL-23的产生减少,两者均与HIF 1 α表达无关。相反,在低氧条件下,IL-22的分泌以HIF 1 α依赖性方式强烈增强。与HIF 1 α缺陷型DC相比,野生型DC中趋化因子受体CCR 7的表达水平更高,而低氧条件下CCL 17和CCL 22的产生增加。使用体外和体内迁移试验,我们观察到缺氧条件下产生的DC的迁移能力增强,这是HIF 1 α依赖性的。总之,我们的数据表明HIF 1 α在低氧环境中对DC分化和迁移起重要作用。
Dendritic cells (DCs) are important sentinels of the immune system and frequently reside in areas of low oxygen availability, in particular in the course of inflammatory processes. Hypoxia-inducible transcription factor (HIF)1α is responsible for major alterations in gene expression as part of the cellular adaptation to low oxygen concentration. In this study, we generated mice with a conditional deletion of HIF1α in DCs. Bone marrow-derived DCs from WT and conditional mutant mice expressed elevated levels of major histocompatibility complex class II and CD86 when grown in a hypoxic environment, whereas production of the cytokines interleukin (IL)-12p70, IL-10, IL-6, TNF-α, IL-1β, and IL-23 was reduced, both independent of HIF1α expression. In contrast, secretion of IL-22 was strongly enhanced under hypoxic conditions in an HIF1α-dependent manner. The chemokine receptor CCR7 was expressed at higher levels in wild-type DCs compared with HIF1α-deficient DCs, whereas the production of CCL17 and CCL22 was increased in conditions of low oxygen. Using in vitro as well as in vivo migration assays, we observed an enhanced migratory capability of DCs generated under hypoxia, which was HIF1α-dependent. Taken together, our data indicate that HIF1α plays an important role for DC differentiation and migration in a low oxygen environment.
通过缺氧对趋化因子受体CXCR4的调节。
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