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2015 ; 7
(6
): 1084-93
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gab.com Text
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The interplay of non-specific binding, target-mediated clearance and FcRn
interactions on the pharmacokinetics of humanized antibodies
#MMPMID26337808
Datta-Mannan A
; Lu J
; Witcher DR
; Leung D
; Tang Y
; Wroblewski VJ
MAbs
2015[]; 7
(6
): 1084-93
PMID26337808
show ga
The application of protein engineering technologies toward successfully improving
antibody pharmacokinetics has been challenging due to the multiplicity of
biochemical factors that influence monoclonal antibody (mAb) disposition in vivo.
Physiological factors including interactions with the neonatal Fc receptor (FcRn)
and specific antigen binding properties of mAbs, along with biophysical
properties of the mAbs themselves play a critical role. It has become evident
that applying an integrated approach to understand the relative contribution of
these factors is critical to rationally guide and apply engineering strategies to
optimize mAb pharmacokinetics. The study presented here evaluated the influence
of unintended non-specific interactions on the disposition of mAbs whose
clearance rates are governed predominantly by either non-specific (FcRn) or
target-mediated processes. The pharmacokinetics of 8 mAbs representing a diverse
range of these properties was evaluated in cynomolgus monkeys. Results revealed
complementarity-determining region (CDR) charge patch engineering to decrease
charge-related non-specific binding can have a significant impact on improving
the clearance. In contrast, the influence of enhanced in vitro FcRn binding was
mixed, and related to both the strength of charge interaction and the general
mechanism predominant in governing the clearance of the particular mAb. Overall,
improved pharmacokinetics through enhanced FcRn interactions were apparent for a
CDR charge-patch normalized mAb which was affected by non-specific clearance. The
findings in this report are an important demonstration that mAb pharmacokinetics
requires optimization on a case-by-case basis to improve the design of molecules
with increased therapeutic application.