Abstract
This study focused on exploring various in vitro to in vivo extrapolation (IVIVE) approaches with the primary goal of improving human hepatic clearance (CL) prediction for OATP substrates. To that effect, the impact of albumin-mediated uptake in human hepatocytes was investigated. In vitro hepatic uptake assay using suspended human hepatocytes was performed with 16 selected OATP substrates to determine the uptake CL in the absence and presence of 4% BSA and unbound hepatocyte to media partition coefficient (Kpuu). Substantial enhancement of the unbound uptake CL (PSu,inf) was observed in the presence of 4% BSA, demonstrating “albumin-mediated” uptake. Prediction of human hepatic CL was performed using two non-traditional IVIVE approaches: initial uptake CL (PSu,inf) and intrinsic metabolic CL (CLint,met) corrected by Kpuu based on extended clearance concept. Compared to traditional IVIVE using CLint,met only, the two tested IVIVE approaches significantly improved the prediction of human hepatic CL. Particularly, direct extrapolation from PSu,inf (+BSA) showed the most robust correlation with in vivo human hepatic CL for all 16 compounds with bias of 1.9–2.0 for two lots of human hepatocytes, respectively. In addition, PSu,inf (+BSA) and Kpuu were also determined in suspended cynomolgus monkey hepatocytes. Prediction of monkey hepatic CL was improved by both approaches, although with more bias compared to human. These results suggested supplementing 4% BSA in human hepatocyte uptake assay provides a useful tool to characterize hepatic uptake CL for OATP substrates, enabling more accurate human CL prediction without any empirical scaling factor (ESF).
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Abbreviations
- AAFE:
-
Absolute average fold error
- BSA:
-
Bovine serum albumin
- CL:
-
Clearance
- CLint,all :
-
Hepatic intrinsic clearance
- CLint,met :
-
Intrinsic hepatic metabolic clearances
- CYP:
-
Cytochrome P450
- DDI:
-
Drug-drug interaction
- ECCS:
-
Extended clearance classification system
- ESF:
-
Empirical scaling factor
- fu,p :
-
The unbound fraction in plasma
- fu,hep :
-
The unbound fraction in hepatocyte suspension incubation
- fu,liver tissue :
-
The unbound fraction in liver tissue
- fu,KHB w 4%,BSA :
-
Unbound fraction in KHB buffer containing 4% BSA
- IVIVE:
-
In vitro to in vivo extrapolation
- KHB:
-
Krebs-Henseleit buffer
- Kpuu,ss :
-
Unbound hepatocytes to media concentration ratio at steady state
- LC-MS/MS:
-
Liquid chromatography-tandem mass spectrometry
- OATP:
-
Organic anion-transporting polypeptide
- PSinf :
-
Hepatic uptake clearance for total drug
- PSu,inf :
-
Unbound hepatic uptake clearance
- PK:
-
Pharmacokinetics
- RMSLE:
-
Root mean squared logarithmic error
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Acknowledgments
Authors would like to thank Dan Rock, Jan Wahlstrom, and Dean Hickman for their support of this work.
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Participated in research design: Na Li and Anshul Gupta.
Conducted experiments: Na Li, Akshay Badrinarayanan, Xingwen Li, John Roberts, Shuai Wang, and Mike Hayashi.
Performed data analysis: Na Li and Kazuya Ishida.
Wrote or contributed to the writing of the manuscript: Na Li, Akshay Badrinarayanan, John Roberts, Mike Hayashi, and Anshul Gupta.
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The Institutional Animal Care and Use Committee (IACUC) at Charles River laboratories approved the animal experiments.
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Li, N., Badrinarayanan, A., Ishida, K. et al. Albumin-Mediated Uptake Improves Human Clearance Prediction for Hepatic Uptake Transporter Substrates Aiding a Mechanistic In Vitro-In Vivo Extrapolation (IVIVE) Strategy in Discovery Research. AAPS J 23, 1 (2021). https://doi.org/10.1208/s12248-020-00528-y
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DOI: https://doi.org/10.1208/s12248-020-00528-y