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A Translational Systems Pharmacology Model for A? Kinetics in Mouse, Monkey, and Human.


ABSTRACT: A mechanistic model of amyloid beta production, degradation, and distribution was constructed for mouse, monkey, and human, calibrated and externally verified across multiple datasets. Simulations of single-dose avagacestat treatment demonstrate that the A?42 brain inhibition may exceed that in cerebrospinal fluid (CSF). The dose that achieves 50% CSF A?40 inhibition for humans (both healthy and with Alzheimer's disease (AD)) is about 1 mpk, one order of magnitude lower than for mouse (10 mpk), mainly because of differences in pharmacokinetics. The predicted maximal percent of brain A?42 inhibition after single-dose avagacestat is higher for AD subjects (about 60%) than for healthy individuals (about 45%). The probability of achieving a normal physiological level for A?42 in brain (1 nM) during multiple avagacestat dosing can be increased by using a dosing regimen that achieves higher exposure. The proposed model allows prediction of brain pharmacodynamics for different species given differing dosing regimens.

SUBMITTER: Karelina T 

PROVIDER: S-EPMC5658289 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature

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A Translational Systems Pharmacology Model for Aβ Kinetics in Mouse, Monkey, and Human.

Karelina T T   Demin O O   Nicholas T T   Lu Y Y   Duvvuri S S   Barton H A HA  

CPT: pharmacometrics & systems pharmacology 20170810 10


A mechanistic model of amyloid beta production, degradation, and distribution was constructed for mouse, monkey, and human, calibrated and externally verified across multiple datasets. Simulations of single-dose avagacestat treatment demonstrate that the Aβ<sub>42</sub> brain inhibition may exceed that in cerebrospinal fluid (CSF). The dose that achieves 50% CSF Aβ<sub>40</sub> inhibition for humans (both healthy and with Alzheimer's disease (AD)) is about 1 mpk, one order of magnitude lower tha  ...[more]

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