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2014 ; 42
(9
): 1587-95
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A numerical method for analysis of in vitro time-dependent inhibition data Part
2 Application to experimental data
#MMPMID24939653
Korzekwa K
; Tweedie D
; Argikar UA
; Whitcher-Johnstone A
; Bell L
; Bickford S
; Nagar S
Drug Metab Dispos
2014[Sep]; 42
(9
): 1587-95
PMID24939653
show ga
Time-dependent inhibition (TDI) of cytochrome P450 enzymes is an important cause
of drug-drug interactions. The standard approach to characterize the kinetics of
TDI is to determine the rate of enzyme loss, kobs, at various inhibitor
concentrations, [I], and replot the kobs versus [I] to obtain the key kinetic
parameters, KI and kinact. In our companion manuscript (Part 1; Nagar et al.,
2014) in this issue of Drug Metabolism and Disposition, we used simulated
datasets to develop and test a new numerical method to analyze in vitro TDI data.
Here, we have applied this numerical method to five TDI datasets. Experimental
datasets include the inactivation of CYP2B6, CYP2C8, and CYP3A4. None of the
datasets exhibited Michaelis-Menten-only kinetics, and the numerical method
allowed use of more complex models to fit each dataset. Quasi-irreversible as
well as partial inhibition kinetics were observed and parameterized. Three
datasets required the use of a multiple-inhibitor binding model. The mechanistic
and clinical implications provided by these analyses are discussed. Together with
the results in Part 1, we have developed and applied a new numerical method for
analysis of in vitro TDI data. This method appears to be generally applicable to
model in vitro TDI data with atypical and complex kinetic schemes.