Enhanced transcription of the 78,000-dalton glucose-regulated protein (GRP78) gene and association of GRP78 with immunoglobulin light chains in a nonsecreting B-cell myeloma line (NS-1).

Enhanced transcription of the 78,000-dalton glucose-regulated protein (GRP78) gene and association of GRP78 with immunoglobulin light chains in a nonsecreting B-cell myeloma line (NS-1).
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在非分泌性 B 细胞骨髓瘤系 (NS-1) 中,78,000 道尔顿葡萄糖调节蛋白 (GRP78) 基因的转录增强以及 GRP78 与免疫球蛋白轻链的关联。

DOI:
10.1128/mcb.9.5.2233-2238.1989
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发表时间:
1989
影响因子:
5.3
通讯作者:
Lee,AS
Lee,AS
中科院分区:
生物学2区
文献类型:
--
作者:
Nakaki,T;Deans,RJ;Lee,AS

文献摘要

参考文献

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78,000-道尔顿葡萄糖调节蛋白(GRP 78)是位于内质网中的应激诱导蛋白。已被鉴定为免疫球蛋白重链结合蛋白。我们在这里报告一个高水平的GRP 78表达的B细胞骨髓瘤系,NS-1,它只产生κ轻链蛋白,但不能分泌它们。在NS-1细胞中GRP 78转录增强,导致GRP 78 mRNA和蛋白水平高于非免疫球蛋白产生细胞。此外,NS-1细胞中的非分泌轻链被发现与GRP 78特异性相关。我们假设,在非分泌淋巴细胞,游离的,未组装的轻链在内质网中的存在下,可能会导致增加GRP 78基因的转录,GRP 78也可以结合免疫球蛋白轻链。
The 78,000-dalton glucose-regulated protein (GRP78) is a stress-inducible protein localized in the endoplasmic reticulum. It has been identified as the immunoglobulin heavy-chain-binding protein. We report here a high level of GRP78 expression in a B-cell myeloma line, NS-1, which produces only kappa light-chain proteins but is unable to secrete them. GRP78 transcription was enhanced in NS-1 cells, resulting in higher levels of GRP78 mRNA and protein than in non-immunoglobulin-producing cells. Furthermore, the nonsecreted light chains in NS-1 cells were found in specific association with GRP78. We hypothesize that in nonsecreting lymphoid cells, the presence of free, unassembled light chains in the endoplasmic reticulum could result in increased transcription of the GRP78 gene and that GRP78 can also bind to immunoglobulin light chains.
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