Defective IL7R expression in T-B+NK+ severe combined immunodeficiency

Defective IL7R expression in T-B+NK+ severe combined immunodeficiency
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DOI:
10.1038/3877
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发表时间:
1998-12-01
期刊:
影响因子:
30.8
通讯作者:
Leonard, WJ
Leonard, WJ
中科院分区:
生物学1区
文献类型:
--
作者:
Puel, A;Ziegler, SF;Leonard, WJ

文献摘要

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相似文献

严重联合免疫缺陷(SCID)是由多种遗传缺陷引起的(1-3)。最常见的SCID形式,X连锁SCID(XSCID),是由IL 2 RG突变引起的(参考文献4),其编码IL-2、IL-4、IL-7、IL-9和IL-15受体共有的共同细胞因子受体γ链(γ(c))(1,5 -10)。在JAK 3突变导致的XSCID和SCID中,JAK 3编码与γ(c)偶联的Janus家族酪氨酸激酶(参考文献9、11、12),并且是γ(c)依赖性信号传导所需的,T细胞和自然杀伤(NK)细胞减少,但B细胞数量正常(1- 3、13、14)(T-B+ NK-SCID)。一些SCID患者缺乏T细胞,但保留NK细胞。鉴于IL-7或IL-7 r缺陷小鼠中T细胞发育减少(15,16),并且IL-7 r缺陷小鼠具有NK细胞(17),我们假设T-B+NK+ SCID可能由IL-7信号传导缺陷引起,尽管已经表明IL-7/IL-7 R途径在人类和小鼠中T细胞和B细胞发育中的作用存在明显差异(1,18)。我们现在证明了培养基控制,缺陷性IL 7 R表达导致T-B+NK+ SCID,表明XSCID中的T细胞而不是NK细胞缺陷是由IL-7 α信号转导的失活引起的。
Severe combined immunodeficiency (SCID) is caused by multiple genetic defects(1-3). The most common form of SCID, X-linked SCID (XSCID), results from mutations in IL2RG (ref. 4), which encodes the common cytokine receptor gamma chain (gamma(c)) that is shared by the IL-2, IL-4, IL-7, IL-9 and IL-15 receptors(1,5-10). In XSCID and SCID resulting from mutations in JAK3, which encodes a Janus family tyrosine kinase that couples to gamma(c) (refs 9,11,12) and is required for gamma(c)-dependent signalling, T- and natural killer (NK)-cells are decreased but B-cell numbers are normal(1-3,13,14) (T-B+NK- SCID). Some SCID patients lack T cells but retain NK cells. Given diminished T-cell development in IL7- or IL7r-deficient mice(15,16) and that Il7r-deficient mice have NK cells(17), we hypothesized that T-B+NK+ SCID might result from defective IL-7 signalling, although apparent differences in the role of the IL-7/IL-7R pathway in humans and mice in T-cell and B-cell development have been suggested(1,18). We now demonstrate medium control that defective IL7R expression causes T-B+NK+ SCID, indicating that the T-cell, but not the NK-cell, defect in XSCID results from inactivation of IL-7 alpha signalling.