Dermatan Sulfate Is a Potential Regulator of IgH via Interactions With Pre-BCR, GTF2I, and BiP ER Complex in Pre-B Lymphoblasts.

Dermatan Sulfate Is a Potential Regulator of IgH via Interactions With Pre-BCR, GTF2I, and BiP ER Complex in Pre-B Lymphoblasts.
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DOI:
10.3389/fimmu.2021.680212
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发表时间:
2021
影响因子:
7.3
通讯作者:
Wang JY
Wang JY
中科院分区:
医学2区
文献类型:
--
作者:
Lee J;Rho JH;Roehrl MH;Wang JY

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皮肤硫酸酯(DS)和自身抗原(autoAg)复合物能够刺激自身反应性CD5+ B1细胞。我们检测了DS对CD5+前b淋巴母细胞NFS-25的活性。CD19、CD5、CD72、PI3K和Fas具有不同程度的DS亲和力。3个前bcr组分Ig重链mu (IgH)、VpreB和lambda 5表现出不同的DS亲和力,其中IgH亲和力最强。DS附着在NFS-25细胞上,逐渐在内质网积累,最终定位到细胞核。DS和IgH在细胞表面和内质网共定位。DS与17种内质网蛋白(如BiP/Grp78、Grp94、Hsp90ab1、Ganab、Vcp、Canx、Kpnb1、Prkcsh、Pdia3)密切相关,这表明内质网中存在与high相关的多蛋白复合物。此外,DS与核蛋白(Ncl、Xrcc6、Prmt5、Eftud2、Supt16h)和Lck相互作用。我们还发现,DS结合GTF2I,一个必需的基因转录因子在IgH位点。这些发现支持DS在蛋白和基因水平上作为前b细胞中IgH的潜在调节剂。我们提出了一个(DS•autoAg)-autoBCR双信号模型,其中autoBCR由autoAg和DS共同参与,一旦内化,DS招募一系列分子,可能有助于避免细胞凋亡和引导自身反应性B细胞的命运。通过其与自身ags的亲和力和对IgH的控制,DS在自身反应性B细胞和自身免疫的发展中成为一个潜在的关键角色。
Dermatan sulfate (DS) and autoantigen (autoAg) complexes are capable of stimulating autoreactive CD5+ B1 cells. We examined the activity of DS on CD5+ pre-B lymphoblast NFS-25 cells. CD19, CD5, CD72, PI3K, and Fas possess varying degrees of DS affinity. The three pre-BCR components, Ig heavy chain mu (IgH), VpreB, and lambda 5, display differential DS affinities, with IgH having the strongest affinity. DS attaches to NFS-25 cells, gradually accumulates in the ER, and eventually localizes to the nucleus. DS and IgH co-localize on the cell surface and in the ER. DS associates strongly with 17 ER proteins (e.g., BiP/Grp78, Grp94, Hsp90ab1, Ganab, Vcp, Canx, Kpnb1, Prkcsh, Pdia3), which points to an IgH-associated multiprotein complex in the ER. In addition, DS interacts with nuclear proteins (Ncl, Xrcc6, Prmt5, Eftud2, Supt16h) and Lck. We also discovered that DS binds GTF2I, a required gene transcription factor at the IgH locus. These findings support DS as a potential regulator of IgH in pre-B cells at protein and gene levels. We propose a (DS•autoAg)-autoBCR dual signal model in which an autoBCR is engaged by both autoAg and DS, and, once internalized, DS recruits a cascade of molecules that may help avert apoptosis and steer autoreactive B cell fate. Through its affinity with autoAgs and its control of IgH, DS emerges as a potential key player in the development of autoreactive B cells and autoimmunity.
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