1
|
Watkins NA, Brown C, Hurd C, Navarrete C, Ouwehand WH. The isolation and characterisation of human monoclonal HLA-A2 antibodies from an immune V gene phage display library. TISSUE ANTIGENS 2000; 55:219-28. [PMID: 10777097 DOI: 10.1034/j.1399-0039.2000.550305.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Molecular cloning techniques and V gene phage display have revolutionised the production of human monoclonal antibodies. Antibodies of a defined specificity can be obtained by selecting phage display libraries on antigen in a process known as panning. We have applied these techniques to the isolation of three HLA-A2-specific single chain variable domain fragments (scFv) from a patient alloimmunised by blood transfusion. Analysis of specificity with cells of HLA genotyped donors revealed the following: i) in addition to the major reactivity with HLA-A2, cross-reactivity with the HLA-A28 epitope; and ii) inhibition of scFv binding to the antigen by the patients' antibodies. The heavy chain variable genes of all three were derived from the germline gene Cos-3, carry the hallmarks of somatic hypermutation, and are most likely derived from clonally related B cells. The light chain variable domains were encoded by DPK1 and DPK8 from the VkappaI family. These data show that phage display can be used to clone HLA-specific alloantibodies that recognise the native antigen from alloimmunised patients.
Collapse
Affiliation(s)
- N A Watkins
- University of Cambridge, Department of Haematology, United Kingdom
| | | | | | | | | |
Collapse
|
2
|
Burlingham WJ, Jankowska-Gan E, DeVito-Haynes L, Fechner JH, Hogan KT, Claas FHJ, Mulder A, Wang X, Ferrone S. HLA (A*0201) Mimicry by Anti-Idiotypic Monoclonal Antibodies. THE JOURNAL OF IMMUNOLOGY 1998. [DOI: 10.4049/jimmunol.161.12.6705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Abstract
Soluble MHC Ags and anti-Id (anti-anti-MHC) Abs have both been shown to inhibit MHC alloantigen-specific B cell responses in vivo. We hypothesized that some anti-idiotypic Abs function as divalent molecular mimics of soluble HLA alloantigen. To test this idea, we studied two well-defined anti-idiotypic mAbs, T10-505 and T10-938, elicited in syngeneic BALB/c mice by immunization with CRll-351, an HLA-A2,24,28-specific mAb. Each anti-Id induced “Ab-3” Abs in rabbits that cross-reacted with HLA-A2 but not with HLA-B Ags. Furthermore, each anti-Id could bind to and block Ag recognition by Ha5C2.A2, a human homologue of mAb CRll-351. Both anti-Id mAb displayed weak reactivity with the human mAb SN66E3, which recognized an overlapping but distinct determinant of HLA-A2 Ags; neither reacted with human mAb MBW1, which recognized a nonoverlapping HLA-A2 determinant. Amino acid sequence comparison of mAb CRll-351 heavy and light chain variable region complementarity-determining regions (CDRs) with those of mAb Ha5C2.A2 and SN66E3 revealed short regions of homology with both human mAb; a large insert in the light chain CDR1 of mAb SN66E3 distinguished it from both CRll-351 and Ha5C2.A2. The amino acid sequences of mAb T10-505 and T10-938, which differed markedly from each other, revealed no homology to the α2 domain sequence of HLA-A*0201 that contains the CRll-351 mAb-defined epitope. We conclude that structurally different anti-Id Abs can mimic a polymorphic conformational epitope of an HLA Ag. In the case of T10-505 and T10-938 mimicry was not based on exact replication of the epitope by the hypervariable loops of the anti-Id mAb.
Collapse
Affiliation(s)
| | | | | | - John H. Fechner
- *Department of Surgery, University of Wisconsin, Madison, WI 53792
| | | | - Frans H. J. Claas
- ‡Department of Immunohaematology and Bloodbank, Leiden University Hospital, Leiden, The Netherlands
| | - Arend Mulder
- ‡Department of Immunohaematology and Bloodbank, Leiden University Hospital, Leiden, The Netherlands
- §SVM-Foundation for the Advancement of Public Health and Environmental Protection, Bilthoven, The Netherlands; and
| | - Xinhui Wang
- ¶Department of Microbiology and Immunology, New York Medical College, Valhalla, NY 10595
| | - Soldano Ferrone
- ¶Department of Microbiology and Immunology, New York Medical College, Valhalla, NY 10595
| |
Collapse
|
3
|
Löffler D, Welschof M, Goldmann SF, Wölpl A. Recognition of HLA-DR1/DRB1 *0101 molecules presenting HLA-A2 derived peptides by a human recombinant antibody, Fab-5 A1. Int J Immunogenet 1998. [DOI: 10.1111/j.1744-313x.1998.tb01151.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|