Abstract
BACKGROUND: Endogenous biomarkers are promising tools to assess transporter-mediated drug-drug interactions early in humans.
METHODS: We evaluated on a common and validated in vitro system the selectivity of 4-pyridoxic acid (PDA), homovanillic acid (HVA), glycochenodeoxycholate-3-sulphate (GCDCA-S) and taurine towards different renal transporters, including multidrug resistance-associated protein, and assessed the in vivo biomarker sensitivity towards the strong organic anion transporter (OAT) inhibitor probenecid at 500 mg every 6 h to reach close to complete OAT inhibition.
RESULTS: PDA and HVA were substrates of the OAT1/2/3, OAT4 (PDA only) and multidrug resistance-associated protein 4; GCDCA-S was more selective, having affinity only towards OAT3 and multidrug resistance-associated protein 2. Taurine was not a substrate of any of the investigated transporters under the in vitro conditions tested. Plasma exposure of PDA and HVA significantly increased and the renal clearance of GCDCA-S, PDA and HVA decreased; the magnitude of these changes was comparable to those of known clinical OAT probe substrates. PDA and GCDCA-S were the most promising endogenous biomarkers of the OAT pathway activity: PDA plasma exposure was the most sensitive to probenecid inhibition, and, in contrast, GCDCA-S was the most sensitive OAT biomarker based on renal clearance, with higher selectivity towards the OAT3 transporter.
CONCLUSIONS: The current findings illustrate a clear benefit of measuring PDA plasma exposure during phase I studies when a clinical drug candidate is suspected to be an OAT inhibitor based on in vitro data. Subsequently, combined monitoring of PDA and GCDCA-S in both urine and plasma is recommended to tease out the involvement of OAT1/3 in the inhibition interaction.
CLINICAL TRIAL REGISTRATION: EudraCT number: 2016-003923-49.
| Original language | English |
|---|---|
| Pages (from-to) | 1187-1199 |
| Number of pages | 13 |
| Journal | Clinical Pharmacokinetics |
| Volume | 60 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sept 2021 |
| Externally published | Yes |
Bibliographical note
© 2021. The Author(s), under exclusive licence to Springer Nature Switzerland AG part of Springer Nature.Keywords
- Biomarkers
- Drug Interactions
- HEK293 Cells
- Humans
- Kidney
- Organic Anion Transport Protein 1
- Organic Anion Transporters, Sodium-Independent
- Pharmaceutical Preparations
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