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Development and characterisation of monoclonal antibodies specific for the murine inhibitory FcγRIIB (CD32B).
Williams, Emily L; Tutt, Alison L; French, Ruth R; Chan, H T Claude; Lau, Betty; Penfold, Christine A; Mockridge, C Ian; Roghanian, Ali; Cox, Kerry L; Verbeek, J Sjef; Glennie, Martin J; Cragg, Mark S.
Afiliação
  • Williams EL; Antibody and Vaccine Group, Cancer Sciences Unit, Faculty of Medicine, University of Southampton, General Hospital, Southampton, UK.
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.
Assuntos

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

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