Pemphigus Vulgaris Antibody Identifies Pemphaxin

Pemphigus Vulgaris Antibody Identifies Pemphaxin
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寻常型天疱疮抗体鉴定 Pemphaxin

DOI:
10.1074/jbc.m003174200
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发表时间:
2000
期刊:
The Journal of Biological Chemistry
影响因子:
--
通讯作者:
S. Grando
S. Grando
中科院分区:
--
文献类型:
--
作者:
V. Nguyen;A. Ndoye;S. Grando

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由于普通天疱疮(PV) igg吸附在rDsg3-Ig-His杆状蛋白诱导的新生小鼠水疱上,因此提出抗粘粒蛋白3 (dsg3)自身抗体是引起天疱疮的原因。然而,我们发现rDsg3-Ig-His吸收针对不同抗原的自身抗体,包括130 kDa的非dsg3角质形成细胞蛋白。这促使我们寻找PV自身免疫的新靶点。从75 kda角化细胞蛋白带中洗脱的PV IgG既以天疱疮样模式染色表皮,又诱导角化细胞单层的棘层溶解。用该抗体筛选角质形成细胞λgt11 cDNA文库,鉴定出携带cDNA插入片段的克隆,该插入片段编码的新分子与膜联蛋白-2具有约40%的相似性,称为pemphaxin (PX)。重组PX (rPX-His)在大肠杆菌M15细胞中产生,由于膜联蛋白可以作为胆碱能受体,因此通过胆碱能放射配体结合实验检测了其构象。rPX-His特异性结合[3H]乙酰胆碱,提示PX是已知可被致病性PV抗体靶向的角化细胞胆碱能受体之一。用rPX-His预吸收PV血清消除棘溶活性,洗脱抗体免疫沉淀天然PX。该抗体单独在体内不会引起皮肤水泡,但将其添加到预吸收的PV IgG片段中可以恢复棘层溶解活性,这表明PV中的棘层溶解是由抗体对不同角质细胞自身抗原(包括乙酰胆碱受体和桥粒体钙粘蛋白)的协同作用引起的。
Because pemphigus vulgaris (PV) IgGs adsorbed on the rDsg3-Ig-His baculoprotein induced blisters in neonatal mice, it was proposed that anti-desmoglein 3 (Dsg 3) autoantibody causes PV. However, we found that rDsg3-Ig-His absorbs autoantibodies to different antigens, including a non-Dsg 3 keratinocyte protein of 130 kDa. This prompted our search for novel targets of PV autoimmunity. The PV IgG eluted from a 75-kDa keratinocyte protein band both stained epidermis in a pemphigus-like pattern and induced acantholysis in keratinocyte monolayers. Screening of a keratinocyte λgt11 cDNA library with this antibody identified clones carrying cDNA inserts encoding a novel molecule exhibiting ∼40% similarity with annexin-2, named pemphaxin (PX). Recombinant PX (rPX-His) was produced inEscherichia coli M15 cells, and, because annexins can act as cholinergic receptors, its conformation was tested in a cholinergic radioligand binding assay. rPX-His specifically bound [3H]acetylcholine, suggesting that PX is one of the keratinocyte cholinergic receptors known to be targeted by disease-causing PV antibodies. Preabsorption of PV sera with rPX-His eliminated acantholytic activity, and eluted antibody immunoprecipitated native PX. This antibody alone did not cause skin blisters in vivo, but its addition to the preabsorbed PV IgG fraction restored acantholytic activity, indicating that acantholysis in PV results from synergistic action of antibodies to different keratinocyte self-antigens, including both acetylcholine receptors and desmosomal cadherins.
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