Braud V, Valentin N, Choppin J, Cesbron A, Bignon JD, Blanchard D, Muller JY. Lack of binding of peptides carrying the human platelet antigen 1 (HPA-1) dimorphism to purified HLA-DRw52a molecules.
REVUE FRANCAISE DE TRANSFUSION ET D'HEMOBIOLOGIE : BULLETIN DE LA SOCIETE NATIONALE DE TRANSFUSION SANGUINE 1993;
36:439-49. [PMID:
7505078 DOI:
10.1016/s1140-4639(05)80156-x]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The strong association between anti-HPA-1a alloimmunization and DR3, DRw52a phenotype in HPA-1b homozygous women suggests that these class II molecules play a crucial role in the immune response against HPA-1a. The diallelic system HPA-1 results in a single amino acid polymorphism at the residue 33 of the glycoprotein IIIa. So, we tested the binding of peptides from the 25-42 region of the GPIIIa to purified HLA-DR3 and -DRw52a molecules, using a solid phase assay and a liquid phase peptide binding assay. No binding was demonstrated, indicating that either the crucial region for binding to class II molecules is not the 25-42 region, or that other events only occurring "in vivo" are required for binding. These results may also suggest an indirect role of the residue 33 for T-cell stimulation.
Collapse