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- W2104446771 abstract "The neonatal Fc receptor (FcRn) is a key determinant of IgG homeostasis. It binds to the Fc domain of IgG in a strictly pH-dependent manner and protects IgG from lysosomal degradation. The impact of FcRn salvage pathway on IgG monoclonal antibody (mAb) pharmacokinetics (PK) has been well established. In this report, a set of mAbs with wild-type human Fc sequences but different Fab domains were used to examine the potential impact of Fab domain on in vitro FcRn binding and in vivo PK. We were surprised to find that mAbs with the same wild-type human Fc sequences but different Fab domains were shown to bind FcRn with considerable differences in both the binding at acidic pH and the dissociation at neutral pH, suggesting that the Fab domain may also have an impact on FcRn interaction. For these mAbs, no relationship between the FcRn binding affinity at acidic pH and in vivo PK was found. Instead, an apparent correlation between the in vitro FcRn dissociation at neutral pH and the in vivo PK in human FcRn mice, nonhuman primates and humans was observed. Our results suggested that the Fab domain of mAbs can affect their interaction with FcRn and thus their pharmacokinetic properties and that in vitro FcRn binding/dissociation assays can be a useful screening tool for pharmacokinetic assessment of mAbs with wild-type Fc sequences." @default.
- W2104446771 created "2016-06-24" @default.
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- W2104446771 date "2011-05-24" @default.
- W2104446771 modified "2023-10-17" @default.
- W2104446771 title "Monoclonal Antibodies with Identical Fc Sequences Can Bind to FcRn Differentially with Pharmacokinetic Consequences" @default.
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- W2104446771 doi "https://doi.org/10.1124/dmd.111.039453" @default.
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