Many alphaIIbbeta3 autoepitopes in chronic immune thrombocytopenic purpura are localized to alphaIIb between amino acids L1 and Q459.

Many alphaIIbbeta3 autoepitopes in chronic immune thrombocytopenic purpura are localized to alphaIIb between amino acids L1 and Q459.
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慢性免疫性血小板减少性紫癜中的许多 αIIbbeta3 自表位定位于氨基酸 L1 和 Q459 之间的 αIIb。

DOI:
10.1046/j.1365-2141.2002.03751.x
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发表时间:
2002
影响因子:
6.5
通讯作者:
Loftus,JosephC
Loftus,JosephC
中科院分区:
医学2区
文献类型:
--
作者:
McMillan,Robert;Wang,Lei;Lopez-Dee,Jennifer;Jiu,Sandra;Loftus,JosephC

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在慢性免疫性血小板减少性紫癜中,自身抗体结合血小板表面蛋白,特别是αIIb,导致网状内皮系统破坏血小板。为了更好地定位αIIb上的自身表位,我们研究了表达αIIbβ3或αIIb-αvβ3嵌合体的中国仓鼠卵巢(CHO)细胞的抗体结合情况,其中αIIb的一段(氨基酸L1-Q459、L1-F223或F223-Q459)替换了αv的该部分。我们评估了14例αIIb依赖抗体阳性的特发性血小板减少性紫癜患者的血小板相关自身抗体。14个中的10个与αIIb(L1-Q459)-αvβ3结合,表明自身表位经常定位于αIIb的这个区域。此外,每个与αIIb(L1-Q459)-αvβ3结合的自身抗体也与表达αIIb(L1-F223)-αvβ3或αIIb(F223-Q459)-αvβ3的CHO细胞结合。在三种洗脱液中的两种中,与 IIb结合的95%的自身抗体可以被表达三种嵌合体的CHO细胞吸附,表明表位(S)在氨基酸F223的两侧都有接触点;在第三种洗脱液中,只有一部分(∼40%)可以被嵌合细胞系吸附,这表明在这位患者中,还存在一种额外的抗体,指向氨基酸Q459的远端。其余四个洗脱物与表达αIIbβ3的CHO细胞结合,但不与任何嵌合体结合,表明这些表位也位于氨基酸Q459的远端。我们得出结论,许多抗αIIbβ3自身抗体的结合依赖于αIIb氨基酸L1-Q459的存在。
In chronic immune thrombocytopenic purpura (ITP), autoantibodies bind to platelet surface proteins, particularly αIIb, resulting in platelet destruction by the reticulo‐endothelial system. In order to better localize the autoepitopes on αIIb, we studied the binding of antibodies to Chinese hamster ovary (CHO) cells expressing either αIIbβ3or αIIb‐αvβ3chimaeras in which a segment of αIIb(either amino acids L1‐Q459, L1‐F223 or F223‐Q459) was substituted for that portion of αv. We evaluated platelet‐associated autoantibodies from 14 ITP patients with αIIb‐dependent antibodies. Ten of 14 bound to αIIb (L1‐Q459)‐αvβ3, showing that autoepitopes were often localized to this region of αIIb. In addition, each of the autoantibodies binding to αIIb (L1‐Q459)‐αvβ3, also bound to CHO cells expressing either αIIb(L1‐F223)‐αvβ3or αIIb(F223‐Q459)‐αvβ3). In two of the three eluates tested, > 95% of the autoantibody binding to αIIbcould be adsorbed using CHO cells expressing any of the three chimaeras, showing that the epitope(s) have contact points on either side of amino acid F223; in the third eluate, only a portion (∼40%) could be adsorbed by the chimaeric cell lines showing that, in this patient, an additional antibody was also present, directed to a site distal to amino acid Q459. The remaining four eluates bound to CHO cells expressing αIIbβ3but to none of the chimaeras, suggesting that these epitopes are also distal to amino acid Q459. We conclude that the binding of many anti‐αIIbβ3autoantibodies is dependent on the presence of αIIbamino acids L1‐Q459.
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