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2004 AUG 4 - (NewsRx.com & NewsRx.net) -- A single recombinant anti-RhD IgG prevents RhD immunization.
"A single recombinant immunoglobulin G1 (IgG1) anti-RhD antibody (MonoRho) was compared with a currently used polyclonal anti-RhD product (Rhophylac) in a phase 1 study for safety, efficacy of Rhesus D (RhD)-positive red blood cell (RBC) clearance, and prevention of RhD immunization in RhD-negative men challenged with 15 mL RhD-positive RBCs. Both the polyclonal product and recombinant anti-RhD effectively cleared RhD-positive RBCs after intravenous and intramuscular injection. The recombinant anti-RhD demonstrated a slower clearance rate compared with the polyclonal anti-RhD," investigators in Switzerland, Germany, and the Netherlands report.
"There was no dose response, and there was considerable variation among subjects who received the same dose of recombinant anti-RhD," said Sylvia Miescher at ZLB Bioplasma AG in Switzerland and collaborators in Switzerland, Germany, and the Netherlands. "Interestingly, RhD-positive RBC clearance rates were strongly associated with Fcgamma receptor IIA (FcgammaRIIA) and FcgammaIIA but not with FcgammaIIIB polymorphisms. Subjects homozygous for FcgammaRIIA-131H or FcgammaRIIIA-158V allotypes showed a ...
Source: HighBeam Research, Single recombinant anti-RhD IgG prevents RhD immunization.