Rearrangement of lambda light chain genes in mature B cells in vitro and in vivo. Function of reexpressed recombination-activating gene (RAG) products.

Rearrangement of lambda light chain genes in mature B cells in vitro and in vivo. Function of reexpressed recombination-activating gene (RAG) products.
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在体外和体内成熟B细胞中Lambda轻链基因的重排。重新表达重组激活基因(RAG)产品的功能。

DOI:
10.1084/jem.187.5.795
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发表时间:
1998-03-02
影响因子:
15.3
通讯作者:
Ohmori, H
Ohmori, H
中科院分区:
医学1区
文献类型:
--
作者:
Hikida, M;Ohmori, H

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在早期B细胞中建立的免疫球蛋白(Ig)基因的V(D)J (V, variable; D, diversity; J, joining)组合被认为在成熟阶段的分化过程中是保守的。然而,生发中心(GC) B细胞在免疫小鼠中重新表达重组激活基因(RAG)-1和RAG-2蛋白。在这里,我们提出了几条线的证据表明,由此诱导的RAG蛋白具有V(D)J重组酶的功能。在体外LPS和IL-4激活的成熟小鼠B细胞中,与RAG基因的表达并行产生反映v - λ1到j - λ1重排的DNA切除产物。在免疫小鼠的引流淋巴结中也观察到类似的λ链基因重排。此外,经过λ基因重排的B细胞通过原位PCR显示定位在GCs内。因此,成熟的B细胞可以发生Ig基因的二次重排(受体编辑)。
V(D)J (V, variable; D, diversity; J, joining) combination of immunoglobulin (Ig) genes established in premature B cells has been thought to be conserved throughout differentiation at mature stages. However, germinal center (GC) B cells have been shown to reexpress recombination-activating gene (RAG)-1 and RAG-2 proteins in immunized mice. Here, we present several lines of evidence indicating that RAG proteins thus induced are functional as the V(D)J recombinase. DNA excision product reflecting Vλ1 to Jλ1 rearrangement was generated in parallel with the expression of RAG genes in mature mouse B cells that were activated in vitro with LPS and IL-4. Similar λ chain gene rearrangement was observed in the draining lymph node of immunized mice. Further, B cells that underwent λ gene rearrangement were shown by in situ PCR to be localized within GCs. Thus, secondary rearrangement of Ig genes (receptor editing) can occur in mature B cells.
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发表时间: 1995-11-01
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影响因子: 32.4
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