PMID: 2524188Apr 15, 1989Paper

Aglycosylation of human IgG1 and IgG3 monoclonal antibodies can eliminate recognition by human cells expressing Fc gamma RI and/or Fc gamma RII receptors

The Biochemical Journal
M WalkerR Jefferis


Aglycosylated human IgG1 and IgG3 monoclonal anti-D (Rh) and human IgG1 and IgG3 chimaeric anti-5-iodo-4-hydroxy-3-nitrophenacetyl (anti-NIP) monoclonal antibodies produced in the presence of tunicamycin have been compared with the native glycosylated proteins with respect to recognition by human Fc gamma RI and/or Fc gamma RII receptors on U937, Daudi or K562 cells. Human red cells sensitized with glycosylated IgG3 form rosettes via Fc gamma RI with 60% of U937 cells. Inhibition of rosette formation required greater than 35-fold concentrated more aglycosylated than glycosylated human monoclonal anti-D (Rh) antibody. Unlabelled polyclonal human IgG and glycosylated monoclonal IgG1 and anti-D (Rh) antibody inhibited the binding of 125I-labelled monomeric human IgG binding by U937 Fc gamma RI at concentrations greater than 50-fold lower than the aglycosylated monoclonal IgG1 anti-D (Rh) (K50 approximately 3 x 10(-9) M and approximately 6 x 10(-7) M respectively). Similar results were obtained using glycosylated and aglycosylated monoclonal human IgG1 or IgG3 chimaeric anti-NIP antibody-sensitized red cells rosetting with Fc gamma RI-/Fc gamma RII+ Daudi and K562 cells. Rosette formation could be inhibited by the glycosylated form...Continue Reading


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