Rapid Isolation of High-affinity Human Antibodies Against the Tumor Vascular Marker Endosialin/TEM1, Using a Paired Yeast-display/secretory ScFv Library Platform

Overview

Journal J Immunol Methods

Publisher Elsevier

Specialties Allergy & Immunology
Pathology

Date 2010 Sep 15

PMID 20837020

Citations 27

Authors

Aizhi Zhao

Selene Nunez-Cruz

Chunsheng Li

George Coukos

Don L Siegel

Nathalie Scholler

Affiliations

Soon will be listed here.

Abstract

Endosialin/TEM1 is predominantly expressed on neovasculature, thus ideally suited for diagnostic, targeted imaging and therapy of cancer. To isolate TEM1-specific affinity reagents, we thought to screen a recombinant antibody (scFv) library derived from the repertoire of a patient with thrombotic thrombocytopenic purpura (TTP), as autoimmune disorders may produce self-reactive specificities. The yeast-display scFv library was constructed by homologous recombination of the TTP patient repertoire originally expressed on M13 bacteriophage in the novel vector pAGA2 for yeast-display expression. The TTP yeast-display library (10⁹ members) was screened by magnetic and flow sorting with human TEM1 recombinant protein. A pool of yeast-display scFv able to detect 2nM of TEM1 was obtained and transformed into yeast-secreted scFv by homologous recombination using the novel p416 BCCP vector for yeast secretion of biotinylated scFv. Anti-TEM1 yeast-secreted scFv were independently validated in vitro by flow cytometry analysis and ELISA assays, then in vivo biotinylated in N-termini to produce biobodies. Biobody-78 bound specifically to Endosialin/TEM1-expressing ovarian tumor in vivo, with functional stability over 48 h. Our results suggest that our novel paired display-secretory yeast libraries can serve as an ideal platform for the rapid isolation of high-affinity reagents, and that anti-TEM1 biobody-78 can be used for in vitro assays including flow cytometry analysis, as well as in vivo for targeted imaging and therapy of cancer.

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