Platelet integrin α 2 I-domain specific antibodies produced via domain specific DNA vaccination combined with variable gene phage display

Hughes, D.L., Stafford, P., Hamaia, S.W., Harmer, I., Schoolmeester, A., Deckmyn, H., Farndale, R.W., Ouwehand, W.H. and Watkins, N.A. 2005. Platelet integrin α 2 I-domain specific antibodies produced via domain specific DNA vaccination combined with variable gene phage display. Thrombosis and Haemostasis. 94 (16), pp. 1318-1326.

TitlePlatelet integrin α 2 I-domain specific antibodies produced via domain specific DNA vaccination combined with variable gene phage display
AuthorsHughes, D.L., Stafford, P., Hamaia, S.W., Harmer, I., Schoolmeester, A., Deckmyn, H., Farndale, R.W., Ouwehand, W.H. and Watkins, N.A.
Abstract

Antibodies are a powerful tool for structure/function studies of platelet proteins. However, classic immunisation frequently elicits antibody responses against domains of minor functional interest. Robust strategies to generate antibodies against defined domains would be of significant interest in post-genome research. In this study, we report a new strategy using a combination of DNA vaccination and V gene phage display that allows the rapid generation of domain specific single-chain Fv antibodies (scFvs).This system was validated using the I-domain of a 2 integrin as a model.The a 2 β 1 integrin, which is expressed on many cell types, is the dominant collagen attachment receptor on platelets, functioning in close interplay with the collagen signalling receptor glycoprotein VI. A novel set of I-domain specific antibodies was obtained by a DNA vaccination/V gene repertoire cloning approach. Mice were first immunised with a DNA vaccine in which the α 2 I-domain is expressed as a fusion protein with fragment C of tetanus toxoid (FrC-TT).Then the heavy and kappa light chain variable gene repertoires were rescued from immune splenocytes using antibody phage display. A total of four a 2 I-domain specific scFvs were isolated by selection on recombinant I-domain or native platelet α 2 β 1 integrin. Characterisation of the scFvs indicated that they recognised distinct epitopes that had profound differences in accessibility between native and recombinant I-domain. Our data suggest DNA immunisation and phage display represent versatile alternatives to protein immunisation and hybridoma-fusion techniques for the isolation of recombinant antibody reagents. This approach will be particularly useful for the generation of domain or splicevariant specific antibodies that recognise native protein.

KeywordsCollagen, variable gene phage display, DNA immunisation, domain-specific
JournalThrombosis and Haemostasis
Journal citation94 (16), pp. 1318-1326
ISSN0340-6245
YearDec 2005
Digital Object Identifier (DOI)doi:10.1160/TH05-06-0410
Publication dates
PublishedDec 2005

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