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Analyzing Potential Intestinal Transporter Drug-Drug Interactions: Reevaluating Ticagrelor Interaction Studies

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Abstract

Purpose

Previous studies evaluating ticagrelor drug-drug interactions have not differentiated intestinal versus systemic mechanisms, which we do here.

Methods

Using recently published methodologies from our laboratory to differentiate metabolic- from transporter-mediated drug-drug interactions, a critical evaluation of five published ticagrelor drug-drug interactions was carried out to investigate the purported clinical significance of enzymes and transporters in ticagrelor disposition.

Results

The suggested CYP3A4 inhibitors, ketoconazole and diltiazem, displayed unchanged mean absorption time (MAT) and time of maximum concentration (Tmax) values as was expected, i.e., the interactions were mainly mediated by metabolic enzymes. The potential CYP3A4/P-gp inhibitor cyclosporine also showed an unchanged MAT value. Further analysis assuming there was no P-gp effect suggested that the increased AUC and unchanged t1/2 for ticagrelor after cyclosporine administration were attributed to the inhibition of intestinal CYP3A4 rather than P-gp. Rifampin, an inducer of CYP3As after multiple dosing, unexpectedly showed decreased MAT and Tmax values, which cannot be completely explained. In contrast, grapefruit juice, an intestinal CYP3A/P-gp/OATP inhibitor, significantly increased MAT and Tmax values for ticagrelor, which may be due to activation of P-gp or inhibition of OATPs expressed in intestine.

Conclusions

This study provides new insight into the role of transporter pathways in ticagrelor intestinal absorption by examining potential MAT and Tmax changes mediated by drug-drug interactions.

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Abbreviations

AUC :

Area under the curve

AUMC :

Area under the moment curve

BCRP:

Breast cancer resistance protein

BCS:

Biopharmaceutics Classification System

BDDCS:

Biopharmaceutics Drug Disposition Classification System

CL/F :

Apparent clearance

CYP:

Cytochrome P450

DDIs:

Drug-drug interactions

ER :

Extraction ratio

F :

Oral bioavailability

MAT :

Mean absorption time

MRT :

Mean residence time

OATP:

Organic anion transport protein

P-gp:

P-glycoprotein

T max :

Time of maximum concentration

t ½,z :

Terminal half-life

V ss /F :

Apparent volume of distribution steady-state

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ACKNOWLEDGEMENTS AND DISCLOSURES

Mr. Liu was supported by a grant from the National Natural Science Foundation of China (grant number 81603204) and a grant from Overseas Training Project for Health Science and Technology Talents of Henan Province (grant number 2018035). Dr. Sodhi was supported in part by an American Foundation for Pharmaceutical Education Predoctoral Fellowship, NIH grant R25 GM56847 and a Louis Zeh Fellowship. Dr. Benet is a member of the UCSF Liver Center supported by NIH grant P30 DK026743. The work in Dr. Benet’s laboratory was supported by the UCSF Benet Fund for Excellence generated from individual contributions and Dr. Benet’s consultation, expert witness and board of director fees that are made payable to the Regents of the University of California. All authors contributed to the writing and analysis of this manuscript. The authors declare no conflict of interest.

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Correspondence to Leslie Z. Benet.

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Liu, S., Sodhi, J.K. & Benet, L.Z. Analyzing Potential Intestinal Transporter Drug-Drug Interactions: Reevaluating Ticagrelor Interaction Studies. Pharm Res 38, 1639–1644 (2021). https://doi.org/10.1007/s11095-021-03105-w

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  • DOI: https://doi.org/10.1007/s11095-021-03105-w

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