Soluble IL-2RA levels in multiple sclerosis subjects and the effect of soluble IL-2RA on immune responses.

Soluble IL-2RA levels in multiple sclerosis subjects and the effect of soluble IL-2RA on immune responses.
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DOI:
10.4049/jimmunol.182.3.1541
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发表时间:
2009-02-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Hafler DA
Hafler DA
中科院分区:
其他
文献类型:
--
作者:
Maier LM;Anderson DE;Severson CA;Baecher-Allan C;Healy B;Liu DV;Wittrup KD;De Jager PL;Hafler DA

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多发性硬化症 (MS) 是一种器官特异性自身免疫性疾病,部分是由基因决定的。编码 IL-2 受体 α 链的基因 IL2RA 含有与多发性硬化症和其他自身免疫性疾病风险相关的等位基因。此外,IL2RA 遗传变异与 1 型糖尿病和多发性硬化症受试者中可溶性 IL-2 受体的水平相关。在这里,我们表明 IL2RA 基因型对 MS 病例与健康对照中可溶性 IL-2RA (sIL-2RA) 水平的影响存在差异;与 MS 相关的两个变异(rs12722489 和 rs2104286)占对照受试者 log10 转化的 sIL-2RA 浓度总方差的 15% 和 18%,但在 MS 受试者中则较少(2% 和 5%),表明与疾病或治疗相关的扰动可能影响 MS 受试者中的 sIL-2RA 水平。虽然分析表明 sIL-2RA 血清浓度在健康对照和未经治疗的 MS 受试者中都是非常稳定的表型,但在良性和恶性 MS 之间观察到差异。这些数据表明,除了 IL2RA 的特定等位基因变异之外,与疾病侵袭性形式相关的免疫扰动也可能影响 MS 受试者血清中的 sIL-2RA 水平。我们还从功能上证明 sIL-2RA 可以抑制 IL-2 信号传导,同时增强 T 细胞增殖和扩增。总之,我们认为,在疾病发作之前,与疾病风险相关的强遗传因素决定了 sIL-2RA 水平,该水平可能会随着与 MS 相关的慢性全身炎症的发作而进一步调节。
Multiple sclerosis (MS) is an organ-specific autoimmune disorder that is in part genetically determined. The gene encoding the α-chain of the IL-2 receptor, IL2RA, harbors alleles associated with risk to MS and other autoimmune diseases. In addition, IL2RA genetic variants correlate with the levels of a soluble form of the IL-2 receptor in subjects with type 1 diabetes and multiple sclerosis. Here, we show that the IL2RA genotypes differentially affects soluble IL-2RA (sIL-2RA) levels in MS cases vs healthy controls; the two variants associated with MS (rs12722489 and rs2104286) account for 15 and 18% of the total variance in log10-transformed sIL-2RA concentration in control subjects but less so in subjects with MS (2 and 5%), suggesting that perturbations associated with disease or treatment may influence sIL-2RA levels in subjects with MS. Whereas analyses demonstrate that sIL-2RA serum concentrations are a remarkably stable phenotype in both healthy controls and untreated MS subjects, a difference is observed between benign and malignant MS. These data indicate that, in addition to specific allelic variants at IL2RA, immunological perturbations associated with aggressive forms of the disease can influence sIL-2RA levels in serum of MS subjects. We also demonstrate, functionally, that sIL-2RA can inhibit IL-2 signaling, yet enhance T cell proliferation and expansion. In summary, we propose that before disease onset, strong genetic factors associated with disease risk dictate sIL-2RA levels that may be further modulated with onset of chronic systemic inflammation associated with MS.
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