CD66 identifies the biliary glycoprotein (BGP) adhesion molecule: cloning, expression, and adhesion functions of the BGPc splice variant.

CD66 identifies the biliary glycoprotein (BGP) adhesion molecule: cloning, expression, and adhesion functions of the BGPc splice variant.
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CD66 识别胆汁糖蛋白 (BGP) 粘附分子:BGPc 剪接变体的克隆、表达和粘附功能。

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发表时间:
1994
期刊:
影响因子:
20.3
通讯作者:
Simmons
Simmons
中科院分区:
医学1区
文献类型:
--
作者:
Suzanne M. Watt;Jon Fawcett;Sarah J Murdoch;A. M. Teixeira;Steve E Gschmeissner;M. A. N. Nasser;David L Hajibagheri;Simmons

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在造血谱系中,单克隆抗体 (MoAb) CD66 与粒细胞谱系的细胞发生反应,但不与来自人骨髓的大多数祖细胞发生反应。我们之前的研究表明,CD66与至少三个癌胚抗原(CEA)超家族成员,即CEA本身、非特异性交叉反应抗原(NCA)和CGM1特异性结合,但不与CGM6(NCA-95)结合。在本报告中,我们表明 CD66 还可识别胆汁糖蛋白 (BGP)。使用 CD66 MoAb 通过表达克隆分离 BGPc 分子(BGPa 的细胞质剪接变体)的全长 cDNA。该蛋白具有与 BGPa 相同的胞外和跨膜序列,具有一个 N 端 IgV 样结构域、三个 IgC 样胞外结构域(A1、B1 和 A2)以及一个跨膜结构域,但胞质结构域由 53 个核苷酸剪接。逆转录聚合酶链式反应实验表明,这种剪接变体可以不同程度地在结肠癌细胞系、原发性结肠腺癌以及骨髓细胞和B细胞系中检测到。通过 RNase 保护对 BGPc RNA 表达进行定量分析表明,丰富的水平仅出现在结肠中,而不出现在所测试的造血细胞系中。这里提出的研究表明 BGPc 介导同型粘附,并表明细胞质剪接不会改变 BGPa 的初始同型粘附特性。
Within the hematopoietic lineage, the monoclonal antibody (MoAb) CD66 reacts with cells of the granulocyte lineage, but not with the majority of progenitor cells from human bone marrow. Our previous studies have shown that CD66 binds specifically to at least three carcinoembryonic antigen (CEA) superfamily members, ie, CEA itself, nonspecific cross-reacting antigen (NCA), and CGM1, but not to CGM6 (NCA-95). In this report, we show that CD66 will also identify the biliary glycoproteins (BGP). A full-length cDNA for the BGPc molecule (a cytoplasmic splice variant of BGPa) was isolated by expression cloning using the CD66 MoAbs. This protein has an identical extracellular and transmembrane sequence to BGPa with one N-terminal IgV like domain, three IgC-like extracellular domains (A1, B1, and A2), plus a transmembrane domain, but the cytoplasmic domain is spliced by 53 nucleotides. Reverse transcriptase-polymerase chain reaction experiments show that this splice variant can be detected in colonic carcinoma cell lines, in primary colonic adenocarcinomas, and in myeloid and B-cell lines to varying degrees. Quantitative analyses of BGPc RNA expression by RNase protection indicate that abundant levels occur only in the colonic, but not in the hematopoietic, cell lines tested. Studies presented here show that BGPc mediates homotypic adhesion and suggest that the cytoplasmic splicing does not alter the initial homotypic adhesion properties of BGPa.
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