Non-fucosylated therapeutic antibodies: the next generation of therapeutic antibodies.

Abstract:

:Therapeutic antibody IgG1 has two N-linked oligosaccharide chains bound to the Fc region. The oligosaccharides are of the complex biantennary type, composed of a trimannosyl core structure with the presence or absence of core fucose, bisecting N-acetylglucosamine (GlcNAc), galactose, and terminal sialic acid, which gives rise to structural heterogeneity. Both human serum IgG and therapeutic antibodies are well known to be heavily fucosylated. Recently, antibody-dependent cellular cytotoxicity (ADCC), a lytic attack on antibody-targeted cells, has been found to be one of the critical effector functions responsible for the clinical efficacy of therapeutic antibodies such as anti-CD20 IgG1 rituximab (Rituxan((R))) and anti-Her2/neu IgG1 trastuzumab (Herceptin((R))). ADCC is triggered upon the binding of lymphocyte receptors (FcgammaRs) to the antibody Fc region. The activity is dependent on the amount of fucose attached to the innermost GlcNAc of N-linked Fc oligosaccharide via an alpha-1,6-linkage, and is dramatically enhanced by a reduction in fucose. Non-fucosylated therapeutic antibodies show more potent efficacy than their fucosylated counterparts both in vitro and in vivo, and are not likely to be immunogenic because their carbohydrate structures are a normal component of natural human serum IgG. Thus, the application of non-fucosylated antibodies is expected to be a powerful and elegant approach to the design of the next generation therapeutic antibodies with improved efficacy. In this review, we discuss the importance of the oligosaccharides attached to the Fc region of therapeutic antibodies, especially regarding the inhibitory effect of fucosylated therapeutic antibodies on the efficacy of non-fucosylated counterparts in one medical agent. The impact of completely non-fucosylated therapeutic antibodies on therapeutic fields will be also discussed.

journal_name

Cytotechnology

journal_title

Cytotechnology

authors

Mori K,Iida S,Yamane-Ohnuki N,Kanda Y,Kuni-Kamochi R,Nakano R,Imai-Nishiya H,Okazaki A,Shinkawa T,Natsume A,Niwa R,Shitara K,Satoh M

doi

10.1007/s10616-007-9103-2

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

109-14

issue

2-3

eissn

0920-9069

issn

1573-0778

journal_volume

55

pub_type

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