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• W1991001030 endingPage "1264" @default.
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• W1991001030 abstract "Pharmacokinetic (PK) testing of a humanized (κI, VH3 framework) and affinity matured anti-hepatitis C virus E2-glycoprotein (HCV-E2) antibody (hu5B3.κ1VH3.v3) in rats revealed unexpected fast clearance (34.9 mL/day/kg). This antibody binds to the rat recycling receptor FcRn as expected for a human IgG1 antibody and does not display non-specific binding to baculovirus particles in an assay that is correlated with fast clearance in cynomolgus monkey. The antigen is not expressed in rat so target-dependent clearance does not contribute to PK. Removal of the affinity maturation changes (hu5B3.κ1VH3.v1) did not restore normal clearance. The antibody was re-humanized on a κ4, VH1 framework and the non-affinity matured version (hu5B3.κ4VH1.v1) was shown to have normal clearance (8.5 mL/day/kg). Since the change in framework results in a lower pI, primarily due to more negative charge on the κ4 template, the effect of additional charge variation on antibody PK was tested by incorporating substitutions obtained through phage display affinity maturation of hu5B3.κ1VH3.v1. A variant having a pI of 8.61 gave very fast clearance (140 mL/day/kg) whereas a molecule with pI of 6.10 gave slow clearance (5.8 mL/kg/day). Both antibodies exhibited comparable binding to rat FcRn, but biodistribution experiments showed that the high pI variant was catabolized in liver and spleen. These results suggest antibody charge can have an effect on PK through alterations in antibody catabolism independent of FcRn-mediated recycling. Furthermore, introduction of affinity maturation changes into the lower pI framework yielded a candidate with PK and virus neutralization properties suitable for clinical development." @default.
• W1991001030 created "2016-06-24" @default.
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• W1991001030 date "2014-09-03" @default.
• W1991001030 modified "2023-10-14" @default.
• W1991001030 title "Framework selection can influence pharmacokinetics of a humanized therapeutic antibody through differences in molecule charge" @default.
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• W1991001030 doi "https://doi.org/10.4161/mabs.29809" @default.
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