High avidity scFv multimers; diabodies and triabodies

被引:167
作者
Hudson, PJ
Kortt, AA
机构
[1] CSIRO Mol Sci, Parkville, Vic 3052, Australia
[2] CRC Diagnost Technol, Parkville, Vic 3052, Australia
关键词
antibody engineering; short linkers; dimers; trimers; diabody; triabody; single chain Fvs;
D O I
10.1016/S0022-1759(99)00157-X
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Multivalent recombinant antibody fragments provide high binding avidity and unique specificity to a wide range of target antigens and haptens. This review describes how careful choice of linker length between V-domains creates new types of Fv modules with size, flexibility and valency suited to in vivo imaging and therapy. Further, we review the design of multi-specific Fv modules suited to cross-linking target antigens for cell-recruitment, viral delivery and immunodiagnostics. Single chain Fv antibody fragments (scFvs) are predominantly monomeric when the V-H and V-L domains are joined by polypeptide linkers of at least 12 residues. An scFv molecule with a linker of 3 to 12 residues cannot fold into a functional Fv domain and instead associates with a second scFv molecule to form a bivalent dimer (diabody, similar to 60 kDa). Reducing the linker length below three residues can force scFv association into trimers (triabodies, similar to 90 kDa) or tetramers (similar to 120 KDa) depending on linker length, composition and V-domain orientation. The increased binding valency in these scFv multimers results in high avidity (long off-rates). A particular advantage for tumor targeting is that molecules of similar to 60-100 kDa have increased tumor penetration and fast clearance rates compared to the parent Ig. A number of cancer-targeting scFv multimers have recently undergone pre-clinical evaluation for in vivo stability and efficacy. Bi- and tri-specific multimers can be formed by association df different scFv molecules and, in the first examples, have been designed as cross-linking reagents for T-cell recruitment into tumors (immunotherapy) and as red blood cell agglutination reagents (immunodiagnostics). (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:177 / 189
页数:13
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