PMID: 11920600Mar 29, 2002Paper

Efficient tumor targeting by single-domain antibody fragments of camels

International Journal of Cancer. Journal International Du Cancer
Virna Cortez-RetamozoHilde Revets

Abstract

The variable domain of functional heavy chain antibodies (VHH) devoid of light chains, found in camels, constitute the smallest intact antigen-binding domain fragment. Two camel single-domain fragments, cAb-Lys2 and cAb-Lys3, recognizing an overlapping epitope of lysozyme with a dissociation constant of 2 nM and 65 nM, respectively, and a bivalent cAb-Lys3 were investigated for their ability to target transgenic tumors expressing lysozyme on their membrane. Biodistribution studies revealed that these non-immunogenic monomeric and bivalent camel single-domain antigen binders specifically target lysozyme-expressing tumors and metastatic lesions. The excess of antibody is rapidly eliminated from the blood circulation and no cAb retention was observed in normal organs. The tumor to organ cAb-ratios at 2 and 8 hr were in the (2.1-10.8):1 and (6.2-23.7):1 range, respectively. The degree and specificity of tumor retention is independent of the affinity of the recombinant camel single-domain fragments for their antigen and from their univalent monomeric (15 kDa) or bivalent format (33 kDa). This study demonstrates the successful and specific in vivo targeting of tumors by camel single-domain fragments. It may open perspectives for thei...Continue Reading

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