Selection and characterisation of a phage-displayed human antibody (Fab) reactive to the lung resistance-related major vault protein

G. L. Scheffer, A. W. Reurs, B. Jutten, S. H.W. Beiboer, R. Van Amerongen, M. Schoester, E. A.C. Wiemer, H. R. Hoogenboom, R. J. Scheper*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademic

7 Citations (Scopus)

Abstract

The major vault protein is the main component on multimeric vault particles, that are likely to play an essential role in normal cell physiorogy and to be associated with multidrug resistance of tumour cells. In order to unravel the function of vaults and their putative contribution to multidrug resistance, specific antibodies are invaluable tools. Until now, only conventional major vault protein-reactive murine monoclonal antibodies have been generated, that are most suitable for immunohistochemical analyses. The phage display method allows for selection of human antibody fragments with potential use in clinical applications. Furthermore, cDNA sequences encoding selected antibody fragments are readily identified, facilitating various molecular targeting approaches. In order to obtain such human Fab fragments recognising major vaurt protein we used a large nonimmunized human Fab fragment phage library. Phages dispraying major vault protein-reactive Fabs were obtained through several rounds of selection on major vault protein-coated immunotubes and subsequent amplification in TGI E coli bacteria. Eventually, one major vault protein-reactive clone was selected and further examined. The anti-major vault protein Fab was found suitable for immunohistochemical and Western blot analysis of tumour cell lines and human tissues. BIAcore analysis showed that the binding affinity of the major vault protein-reactive clone almost equalled that of the murine anti-major vault protein Mabs. The cDNA sequence of this human Fab may be exploited to generate an intrabody for major vaurt protein-knock out studies. Thus, this human Fab fragment should provide a valuable tool in elucidating the contribution(s) of major vault protein/vaults to normal physiology and cellular drug resistance mechanisms.

Original languageEnglish
Pages (from-to)954-962
Number of pages9
JournalBritish Journal of Cancer
Volume86
Issue number6
DOIs
Publication statusPublished - 12 Mar 2002

Bibliographical note

Funding Information:
This work was supported in part by Koningin Wilhelmina Fonds (KWF) grant EUR 98-1754 to EAC Wiemer and RJ Scheper and by the Netherlands Technology Foundation (STW), grant MGN55.3858, 805.17.753 to SHW Beiboer and HR Hoogenboom.

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