CCR9 + T helper (Th) cells can induce Sjögren-like symptoms in mice and both CCR9 + Th cells and their ligand CCL25 are increased in the salivary glands of primary Sjögren's syndrome (pSS) patients. Increased circulating CCR9 + Th cells are present in pSS patients. CCR9 + Th cells are hyperresponsive to IL-7, secrete high levels of IFN-γ, IL-21, IL-17 and IL-4 and potently stimulate B cells in both patients and healthy individuals. Our aim was to study co-expression of chemokine receptors on CCR9 + Th cells and whether in pSS this might differentially affect CCR9 + Th cell frequencies. Frequencies of circulating CCR9 + and CCR9- Th cells co-expressing CXCR3, CCR4, CCR6 and CCR10 were studied in pSS patients and healthy controls. CCL25, CXCL10, CCL17, CCL20 and CCL27 mRNA and protein expression of salivary gland tissue of pSS and non-Sjögren's sicca (non-SS) patients was assessed. Chemotaxis assays were performed to study migration induced by CXCL10 and CCL25. Higher expression of CXCR3, CCR4 and CCR6 but not CCR10 was observed on CCR9 + Th cells as compared to cells lacking CCR9. Decreased frequencies of circulating memory CCR9 + CXCR3+ Th cells were found in pSS patients, which was most pronounced in the effector memory subset. Increased salivary gland CCL25 and CXCL10 expression significantly correlated and both ligands functioned synergistically based on in vitro induced chemotaxis. Decreased memory CXCR3 + CCR9+ Th cells in blood of pSS patients may be due to a concerted action of overexpressed ligands at the site of inflammation in the salivary glands facilitating their preferential migration and positioning in the lymphocytic infiltrates.

译文

CCR9 T辅助 (Th) 细胞可以在小鼠中诱导sj ö gren样症状,并且原发性sj ö gren综合征 (pSS) 患者的唾液腺中CCR9 Th细胞及其配体CCL25均增加。pSS患者存在循环CCR9 + Th细胞增加。CCR9 + Th细胞对IL-7反应过度,分泌高水平的IFN-γ,IL-21,IL-17和IL-4,并有效刺激患者和健康个体的b细胞。我们的目的是研究趋化因子受体在CCR9 Th细胞上的共表达,以及在pSS中这是否可能差异影响CCR9 Th细胞频率。在pSS患者和健康对照中研究了共同表达CXCR3,CCR4,CCR6和CCR10的循环CCR9和CCR9- Th细胞的频率。评估了pSS和非sj ö gren sicca (非SS) 患者唾液腺组织的CCL25,CXCL10,CCL17,CCL20和CCL27 mRNA和蛋白表达。进行趋化性测定以研究CXCL10和ccl25诱导的迁移。与缺乏CCR9的细胞相比,在CCR9 Th细胞上观察到CXCR3,CCR4和CCR6的表达更高,但没有CCR10。在pSS患者中发现循环记忆CCR9 CXCR3 Th细胞的频率降低,这在效应记忆子集中最为明显。唾液腺CCL25和CXCL10表达的增加显着相关,并且两个配体基于体外诱导的趋化性协同作用。pSS患者血液中记忆CXCR3 CCR9 Th细胞减少可能是由于唾液腺炎症部位过度表达的配体协同作用,促进了它们在淋巴细胞浸润中的优先迁移和定位。

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