Journal Article
. 2012 Mar; 188(9):4405-11.
doi: 10.4049/jimmunol.1200090.

Different adaptations of IgG effector function in human and nonhuman primates and implications for therapeutic antibody treatment

Max Warncke 1 Thomas Calzascia  Michele Coulot  Nicole Balke  Ratiba Touil  Frank Kolbinger  Christoph Heusser  
  • PMID: 22461693
  •     47 citations


Safety of human therapeutic Abs is generally assessed in nonhuman primates. Whereas IgG1 shows identical FcγR interaction and effector function profile in both species, fundamental differences in the IgG2 and IgG4 Ab subclasses were found between the two species. Granulocytes, the main effector cells against IgG2- and IgG4-opsonized bacteria and parasites, do not express FcγRIIIb, but show higher levels of FcγRII in cynomolgus monkey. In humans, IgG2 and IgG4 adapted a silent Fc region with weak binding to FcγR and effector functions, whereas, in contrast, cynomolgus monkey IgG2 and IgG4 display strong effector function as well as differences in IgG4 Fab arm exchange. To balance this shift toward activation, the cynomolgus inhibitory FcγRIIb shows strongly increased affinity for IgG2. In view of these findings, in vitro and in vivo results for human IgG2 and IgG4 obtained in the cynomolgus monkey have to be cautiously interpreted, whereas effector function-related effects of human IgG1 Abs are expected to be predictable for humans.

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