Single-chain antibody fragment-based adsorbent for the extracorporeal removal of β2-microglobulin

Eric A. Grovender, Brenda Kellogg, Jasleen Singh, Daniel Blom, Hidde Ploegh, K. Dane Wittrup, Robert S. Langer, Guillermo A. Ameer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Background. Dialysis-related amyloidosis (DRA) is a frequent complication of end-stage renal disease (ESRD) that has been associated with the accumulation of β2-microglobulin (β2-m). Removal of β2-m results in the loss of important proteins due to the nonspecific nature of current therapies. Although whole antibodies can potentially be used to confer specificity to β2-m removal from blood, single-chain variable region (scFv) antibody fragments could potentially offer several advantages as immunoadsorption ligands due to their size, genetic definition, ability to be expressed by microbes, and amenability for in vitro evolution. Methods. An antihuman β2-m scFv was constructed from the BBM.1 hybridoma and expressed by a yeast display vector. The binding affinity of the wild-type scFv fragment was quantified by flow cytometry analysis. Soluble scFv was expressed by a yeast secretion vector, purified, and immobilized onto agarose beads. The binding capacity of the immunoadsorbent was measured by equilibrating samples with saturating quantities of fluorescent β2-m in serum. Results. The displayed scFv possessed a nanomolar affinity (KD = 0.008 ± 0.004 mg-β 2-m/L). The immunoadsorbent exhibited an adsorption site density of 0.41 ± 0.01 mg β2-m/mL settled gel. Under saturating conditions, the mass ratio of adsorbed β2-m to immobilized antibody is 70% greater than any previous literature report for whole antibodies. Preliminary specificity experiments suggest that the scFv-based immunoadsorbent is specific toward human β2-m. Conclusion. Recombinant DNA technology was successfully used to engineer an scFv-based immunoadsorbent. Use of immobilized scFvs during hemodialysis may minimize loss of valuable proteins and facilitate the removal of macromolecules that are significantly larger than the molecular weight cut-off of the membrane.

Original languageEnglish (US)
Pages (from-to)310-322
Number of pages13
JournalKidney international
Volume65
Issue number1
DOIs
StatePublished - Jan 2004

Keywords

  • Dialysis-associated amyloidosis
  • Dialysis-related amyloidosis
  • Immobilized antibodies
  • Yeast display
  • scFv

ASJC Scopus subject areas

  • Nephrology

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