Differential control of CD22 ligand expression on B and T lymphocytes, and enhanced expression in murine systemic lupus.

Differential control of CD22 ligand expression on B and T lymphocytes, and enhanced expression in murine systemic lupus.
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B 和 T 淋巴细胞上 CD22 配体表达的差异控制,以及小鼠系统性狼疮中表达的增强。

DOI:
10.1002/art.11021
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发表时间:
2003
期刊:
Arthritis and rheumatism.
影响因子:
--
通讯作者:
Izui,Shozo
Izui,Shozo
中科院分区:
--
文献类型:
--
作者:
Lajaunias,Frederic;Ida,Akinori;Kikuchi,Shuichi;Fossati-Jimack,Liliane;Martinez-Soria,Eduardo;Moll,Thomas;Law,Che-Leung;Izui,Shozo

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ObjectiveCD22 是一种 B 细胞限制性跨膜糖蛋白,通过与 α2,6 连接的唾液酸聚糖相互作用来调节 B 细胞抗原受体信号传导,这些聚糖充当配体并在 B 细胞和 T 细胞上表达。在本研究中,我们研究了淋巴细胞激活后或系统性红斑狼疮 (SLE) 过程中 CD22 配体 (CD22L) 的表达如何受到调节。方法在用抗原或刺激物刺激后,使用可溶性重组形式的 CD22 通过流式细胞术分析评估非自身免疫小鼠 B 和 T 细胞上 CD22L 的表达水平。 体外有丝分裂原。此外,循环淋巴细胞上 CD22L 的表达水平与狼疮易感小鼠的 SLE 进展相关。结果我们在非自身免疫小鼠中观察到 CD22L 在成熟 B 细胞上的组成型表达,但 T 细胞上没有。然而,在体外用抗原刺激的 T 细胞(而非 B 细胞)上,CD22L 水平选择性上调,而在用脂多糖进行多克隆激活后,B 细胞上的表达水平上调。此外,在几种不同的狼疮倾向小鼠和一组 (C57BL/6 × [NZB × C57BL/6.Yaa]F1) 回交小鼠中,循环 B 细胞上的 CD22L 表达增加(T 细胞上的表达程度较小),与 SLE 的进展平行。结论 CD22L 的表达在 B 细胞和 T 细胞中受到差异性调节,CD22L 的高表达 循环 B 细胞上的 CD22-CD22L 相互作用是严重 SLE 发展的标志,表明 CD22-CD22L 相互作用在 SLE 以及体液免疫调节中发挥作用。
ObjectiveCD22, a B cell–restricted transmembrane glycoprotein, regulates B cell antigen receptor signaling upon interaction with α2,6‐linked sialic acid–bearing glycans, which act as ligands and are expressed on B and T cells. In this study, we investigated how the expression of CD22 ligand (CD22L) is modulated following lymphocyte activation or during the course of systemic lupus erythematosus (SLE).MethodsThe expression levels of CD22L on B and T cells in nonautoimmune mice were assessed by flow cytometric analysis using a soluble recombinant form of CD22, following stimulation with antigen or mitogen in vitro. In addition, the expression levels of CD22L on circulating lymphocytes were correlated with the progression of SLE in lupus‐prone mice.ResultsWe observed a constitutive expression of CD22L on mature B cells, but not T cells, in nonautoimmune mice. However, CD22L levels were up‐regulated selectively on T cells (but not B cells) stimulated with antigens in vitro, while their expression levels on B cells was up‐modulated following polyclonal activation with lipopolysaccharide. Furthermore, expression of CD22L was increased on circulating B cells (and to a lesser extent on T cells) in parallel with progression of SLE in several different lupus‐prone mice and in a cohort of (C57BL/6 × [NZB × C57BL/6.Yaa]F1) backcross mice.ConclusionThe expression of CD22L is differentially regulated in B and T cells, and high expression of CD22L on circulating B cells is a marker for development of severe SLE, suggesting a role for CD22–CD22L interactions in SLE as well as in the regulation of humoral immunity.
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