Putting J chain back on the map: how might its expression define plasma cell development?

Putting J chain back on the map: how might its expression define plasma cell development?
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让 J 链重新出现在地图上:它的表达如何定义浆细胞的发育?

DOI:
10.4049/jimmunol.1400531
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发表时间:
2014-10-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Flajnik MF
Flajnik MF
中科院分区:
其他
文献类型:
--
作者:
Castro CD;Flajnik MF

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J 链(连接链)是一种小多肽,可调节分泌型 IgM 和 IgA 的多聚化,而分泌型 IgM 和 IgA 是仅有的两种能够形成多聚体的哺乳动物 Ig。 J 链对于多聚 Ig 受体 (pIgR) 介导的这些 Ig 类别跨粘膜上皮的转运也是必需的。尽管有文献记载在哺乳动物中,特别是在所有单体 IgA 和一些 IgG 分泌细胞中存在 J 链阴性浆细胞,但通常认为所有浆细胞都表达 J 链,无论表达的同种型如何。与大多数其他免疫分子相比,J 链尚未得到广泛研究,部分原因是技术限制。即使是报道的 J 链敲除小鼠的表型也经常被误解或低估。在这篇简短的综述中,我们将根据各种提出的 J 链表达和调控模型来讨论 J 链,并重点关注 J 链的进化意义及其在不同 B 细胞谱系/分化状态中的表达。
J-chain (Joining chain) is a small polypeptide that regulates multimerization of secretory IgM and IgA, the only two mammalian Igs capable of forming multimers. J-chain also is required for polyIg-receptor (pIgR)-mediated transport of these Ig classes across the mucosal epithelium. It is generally assumed that all plasma cells express J-chain regardless of expressed isotype, despite the documented presence of J-chain-negative plasma cells in mammals, specifically in all monomeric IgA- and some IgG-secreting cells. Compared to most other immune molecules, J-chain has not been extensively studied, due, in part, to technical limitations. Even the reported phenotype of the J-chain knockout mouse is often misunderstood or underappreciated. In this short review, we will discuss J-chain in light of the various proposed models of its expression and regulation, with an added focus on the evolutionary significance of J-chain and its expression in different B cell lineages/differentiation states.
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