Abstract
Introduction
In drug discovery and development, it is of high interest to characterize the potential for intestinal drug-drug interactions to alter bioavailability of a victim drug. For drugs that are substrates of both intestinal transporters and enzymes, estimating the relative contribution of each process has proved challenging, especially since the susceptibility of drug to uptake or efflux transporters in vitro does not always translate to clinically significant in vivo involvement. Here we introduce a powerful methodology to implicate intestinal transporters in drug-drug interactions based on the theory that clinically relevant intestinal transporter interactions will result in altered rate of absorption of victim drugs.
Methods and Materials
We present exemplary clinical drug-drug interaction studies that utilize well-characterized clinical substrates and perpetrators to demonstrate how mean absorption time (MAT) and time to maximum concentration (tmax) are expected to change (or remain unchanged) when either intestinal transporters or metabolic enzymes were/are altered. Apixaban was also selected to demonstrate the utility of the methodology, as the purported involvement of both intestinal enzymes and transporters has been suggested in its FDA package insert.
Results and Discussion
Acute inhibition of gut efflux transporters resulted in decreased MAT and tmaxvalues, induction increased these values, while inhibition of intestinal metabolic enzymes did not result in altered MAT or tmax. Involvement of intestinal efflux transporters in apixaban disposition is unlikely.
Conclusion
Utilization of this simple but powerful methodology to implicate intestinal transporter involvement will have significant impact on how drug-drug interactions are interpreted.
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Abbreviations
- AUC :
-
area under the curve
- AUC 0 → ∞ :
-
area under the curve extrapolated to infinity for a single dose
- AUC 0 → τ :
-
area under the curve during a dosing interval at steady-state
- AUC τ → ∞ :
-
area under the curve extrapolated from the end of the dosing interval to infinity at steady-state
- AUMC :
-
area under the moment curve
- AUMC 0 → ∞ :
-
area under the moment curve extrapolated to infinity for a single dose
- AUMC 0 → τ :
-
area under the moment curve during a dosing interval at steady-state
- BCRP:
-
breast cancer resistance protein
- BDDCS:
-
Biopharmaceutics Drug Disposition Classification System
- CL :
-
clearance
- CL/F :
-
apparent clearance
- CYP:
-
cytochrome P450
- DDI:
-
drug-drug interaction
- F :
-
bioavailability
- F A :
-
fraction absorbed
- F G :
-
fraction escaping intestinal elimination
- F H :
-
fraction escaping hepatic elimination
- I gut :
-
maximum perpetrator concentration in the gut
- k a :
-
absorption rate constant
- k e :
-
elimination rate constant
- MAT :
-
mean absorption time
- MRT :
-
mean residence time
- OATP:
-
organic anion transporting polypeptide
- P-gp:
-
P-glycoprotein
- τ :
-
dosing interval
- t max :
-
time at which maximal concentration is observed
- t 1/2, z :
-
terminal half-life
- V ss :
-
volume of distribution at steady state
- V ss /F :
-
apparent volume of distribution at steady state
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Acknowledgements
The authors would like to thank members of our laboratory for their thoughtful discussions in the development of this manuscript, including Dr. Annette Chu, Caroline Huang, Wen Kou, Dr. Ivan Kozachenko, Shuaibing Liu, and Dr. Yue Xiang.
This work was supported in part by a Mary Ann Koda-Kimble Seed Award for Innovation. Ms. Sodhi was supported in part by an American Foundation for Pharmaceutical Education Predoctoral Fellowship, NIGMS grant R25 GM56847 and a Louis Zeh Fellowship. Dr. Benet is a member of the UCSF Liver Center supported by NIH grant P30 DK026743
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Sodhi, J.K., Benet, L.Z. The Necessity of Using Changes in Absorption Time to Implicate Intestinal Transporter Involvement in Oral Drug-Drug Interactions. AAPS J 22, 111 (2020). https://doi.org/10.1208/s12248-020-00469-6
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DOI: https://doi.org/10.1208/s12248-020-00469-6