Abstract
The project SAFEPEDRUG aims to provide guidelines for drug research in children, based on bottom-up and top-down approaches. Propofol, one of the studied model compounds, was selected because it is extensively metabolized in liver and kidney, with an important role for the glucuronidation pathway. Besides, being a lipophilic molecule, it is distributed into fat tissues, from where it redistributes into the systemic circulation. In the past, both bottom-up (Physiologically based pharmacokinetic, PBPK) and top-down approaches (population pharmacokinetic, popPK) were applied to describe its pharmacokinetics (PK). In this work, a combination of the two was used to check their performance to describe PK in children and neonates (both term and preterm) using propofol as a case compound. First, in vitro data was generated in human liver microsomes and recombinant enzymes and used to develop an adult PBPK model in Simcyp®. Activity adjustment factors (AAFs) were calculated to account for differences between in vitro and in vivo enzyme activity. Clinical data were analyzed using a 3-compartment model in NONMEM. These data were used to construct a retrograde PBPK model and for qualification of the PBPK models. Once an accurate in vivo clearance was obtained accounting for the contribution of the different metabolic pathways, the resulting PBPK models were challenged with new data for qualification. After that, the constructed adult PPBK model for propofol was extrapolated to the pediatric population. Both the default built-in and in vivo derived ontogeny functions were used to do so. The models were qualified by comparing their predicted PK parameters to published values, and by comparison of predicted concentration–time profiles to available clinical data. Clearance values were predicted well, especially when compared with values obtained from trials where long-term sampling was applied, whereas volume of distribution was lower compared to the most common popPK model predictions. Concentration–time profiles were predicted well up until and including the preterm neonatal population. In this work, it was thus shown that PBPK can be used to predict the PK up to and including the preterm neonatal population without the use of pediatric in vivo data. This work adds weight to the need for further development of PBPK models, especially regarding distribution modeling and the use of in vivo derived ontogeny functions.
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Abbreviations
- 4HP:
-
4-Hydroxy propofol
- AAF:
-
Activity adjustment factor
- CL int :
-
Intrinsic clearance
- CL int,u :
-
Unbound intrinsic clearance
- CYP:
-
Cytochrome P450
- HLM:
-
Human liver microsomes
- HKM:
-
Human kidney microsomes
- IVIVE:
-
In vitro in vivo extrapolation
- MPPGK:
-
Microsomal protein per gram kidney
- MPPGL:
-
Microsomal protein per gram liver
- PBPK:
-
Physiologically based pharmacokinetics
- PG:
-
Propofol glucuronide
- PopPK:
-
Population pharmacokinetics
- rhCYP:
-
Recombinant human CYP
- rhUGT:
-
Recombinant human UGT
- UGT:
-
Uridine 5′-diphospho-glucuronosyltransferase
- SPE:
-
Solid phase extraction
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Funding was provided by Agentschap voor Innovatie door Wetenschap en Technologie (Grant No. IWT/SBO 130033).
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Michelet, R., Van Bocxlaer, J., Allegaert, K. et al. The use of PBPK modeling across the pediatric age range using propofol as a case. J Pharmacokinet Pharmacodyn 45, 765–785 (2018). https://doi.org/10.1007/s10928-018-9607-8
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DOI: https://doi.org/10.1007/s10928-018-9607-8