Abstract
The human platelet alloantigen HPA-1a (Pl(A1)) 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.
Original language | English (US) |
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Pages (from-to) | 156-163 |
Number of pages | 8 |
Journal | Tissue Antigens |
Volume | 51 |
Issue number | 2 |
DOIs | |
State | Published - 1998 |
Keywords
- Glycoprotein IIIa human platelet alloantigen
- Phage display library
- Recombinant antibody
ASJC Scopus subject areas
- Genetics
- Biochemistry
- Immunology and Allergy
- Immunology