Development and characterisation of monoclonal antibodies specific for the murine inhibitory FcγRIIB (CD32B).
Eur J Immunol
; 42(8): 2109-20, 2012 Aug.
Article
em En
| MEDLINE
| ID: mdl-22760702
ABSTRACT
Fc receptors (FcRs) play a key role in regulating and coordinating responses from both innate and adaptive arms of the immune system. The inhibitory Fc gamma receptor II (FcγRIIB; CD32) is central to this regulation with FcγRIIB(-/-) mice demonstrating augmented responses to mAb immunotherapy, elevated incidence and severity of auto-immunity, and increased response to mAb-mediated cancer therapy. To date, these observations have remained unexploited therapeutically, partly through a lack of specific mAb reagents capable of exclusively binding mouse FcγRIIB. Thus almost all of the FcγRIIB-binding mAb currently available, such as 2.4G2, also bind FcγRIII (CD16), and polyclonal reagents have limited availability and are of unproven specificity and avidity, making in vivo manipulation of FcγRIIB impossible. Following an extensive immunisation protocol using FcγRIIB(-/-) mice, we recently produced three unique mAb that are suitable for this purpose. Here we characterise these novel reagents and demonstrate that they fall into two distinct categories; those which cause phosphorylation and subsequent activation of FcγRIIB (agonistic) and those that block receptor phosphorylation (antagonistic). These two types of mAb exhibit different characteristics in a range of biochemical, cellular, and functional assays relevant to FcγRIIB activity and mAb therapy.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Receptores de IgG
/
Anticorpos Monoclonais
Tipo de estudo:
Guideline
Limite:
Animals
Idioma:
En
Revista:
Eur J Immunol
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Reino Unido