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2017 ; 8
(ä): 884
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Neutralization of Human Interleukin 23 by Multivalent Nanobodies Explained by the
Structure of Cytokine-Nanobody Complex
#MMPMID28871249
Desmyter A
; Spinelli S
; Boutton C
; Saunders M
; Blachetot C
; de Haard H
; Denecker G
; Van Roy M
; Cambillau C
; Rommelaere H
Front Immunol
2017[]; 8
(ä): 884
PMID28871249
show ga
The heterodimeric cytokine interleukin (IL) 23 comprises the IL12-shared p40
subunit and an IL23-specific subunit, p19. Together with IL12 and IL27, IL23 sits
at the apex of the regulatory mechanisms shaping adaptive immune responses. IL23,
together with IL17, plays an important role in the development of chronic
inflammation and autoimmune inflammatory diseases. In this context, we generated
monovalent antihuman IL23 variable heavy chain domain of llama heavy chain
antibody (V(HH)) domains (Nanobodies(®)) with low nanomolar affinity for human
interleukin (hIL) 23. The crystal structure of a quaternary complex assembling
hIL23 and several nanobodies against p19 and p40 subunits allowed identification
of distinct epitopes and enabled rational design of a multivalent IL23-specific
blocking nanobody. Taking advantage of the ease of nanobody formatting,
multivalent IL23 nanobodies were assembled with properly designed linkers
flanking an antihuman serum albumin nanobody, with improved hIL23 neutralization
capacity in vitro and in vivo, as compared to the monovalent nanobodies. These
constructs with long exposure time are excellent candidates for further
developments targeting Crohn's disease, rheumatoid arthritis, and psoriasis.