Identification of a human heavy chain antibody fragment directed against human platelet alloantigen la by phage display library

Autor: N Okamoto, Thomas S. Kickler, James F. Casella, Hidetoshi Inoko, Emily Barron-Casella, S. D. Kennedy
Rok vydání: 2008
Předmět:
Zdroj: Tissue Antigens. 51:156-163
ISSN: 0001-2815
DOI: 10.1111/j.1399-0039.1998.tb02960.x
Popis: The human platelet alloantigen HPA-1a (PlA1) is responsible for most cases of post-transfusion purpura and neonatal alloimmune thrombocytopenia in the Caucasian population. HPA-1a and HPA-1b are two allelic forms of the platelet membrane glycoprotein IIIa (GPIIIa) gene that differ by a single amino acid. In this report, we describe the development of a recombinant heavy chain antibody fragment capable of distinguishing between the homozygous forms of HPA-1a and HPA-1b. This antibody fragment was isolated from the lymphocytes of an immunized individual through the use of a phage display library system. The recombinant antibody fragment reacted with human platelet lysates from HPA-1a homozygous donors, the HPA-1a form of recombinant N-terminal GPIIIa and intact HPA-1a platelets, but did not react with platelet lysate from HPA-1b homozygous donors, reduced HPA-1a form of platelet GPIIIa or other platelet glycoproteins. This HPA-1a specific human antibody fragment works well in common laboratory assays such as ELISA and flow cytometry, which can assist in identifying HPA-1b homozygous individuals who are known to have a higher risk for developing neonatal alloimmmune thrombocytopenia and post-transfusion purpura. Thus, selection of recombinant antibody fragment using phage display offers a promising alternative to hybridoma technology for the production of human antibodies against human alloantigens and holds potential as a technique in therapeutic applications.
Databáze: OpenAIRE
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