Absorption, Metabolism, and Excretion of ACT-1004-1239, a First-In-Class CXCR7 Antagonist: In Vitro, Preclinical, and Clinical Data
Christine Huynh, Swen Seeland, Jerome Segrestaa, Carmela Gnerre, Jens Hogeback, Henriette E Meyer Zu Schwabedissen, Jasper Dingemanse, Patricia N Sidharta, Christine Huynh, Swen Seeland, Jerome Segrestaa, Carmela Gnerre, Jens Hogeback, Henriette E Meyer Zu Schwabedissen, Jasper Dingemanse, Patricia N Sidharta
Abstract
ACT-1004-1239 is a potent, selective, first-in-class CXCR7 antagonist, which shows a favorable preclinical and clinical profile. Here we report the metabolites and the metabolic pathways of ACT-1004-1239 identified using results from in vitro and in vivo studies. Two complementary in vitro studies (incubation with human liver microsomes in the absence/presence of cytochrome P450- [CYP] specific chemical inhibitors and incubation with recombinant CYPs) were conducted to identify CYPs involved in ACT-1004-1239 metabolism. For the in vivo investigations, a microtracer approach was integrated in the first-in-human study to assess mass balance and absorption, distribution, metabolism, and excretion (ADME) characteristics of ACT-1004-1239. Six healthy male subjects received orally 100 mg non-radioactive ACT-1004-1239 together with 1 μCi 14C-ACT-1004-1239. Plasma, urine, and feces samples were collected up to 240 h post-dose and 14C-drug-related material was measured with accelerator mass spectrometry. This technique was also used to construct radiochromatograms of pooled human samples. Metabolite structure elucidation of human-relevant metabolites was performed using high performance liquid chromatography coupled with high resolution mass spectrometry and facilitated by the use of rat samples. CYP3A4 was identified as the major CYP catalyzing the formation of M1 in vitro. In humans, the cumulative recovery from urine and feces was 84.1% of the dose with the majority being eliminated via the feces (69.6%) and the rest via the urine (14.5%). In human plasma, two major circulating metabolites were identified, i.e., M1 and M23. Elimination via M1 was the only elimination pathway that contributed to ≥25% of ACT-1004-1239 elimination. M1 was identified as a secondary amine metabolite following oxidative N-dealkylation of the parent. M23 was identified as a difluorophenyl isoxazole carboxylic acid metabolite following central amide bond hydrolysis of the parent. Other metabolites observed in humans were A1, A2, and A3. Metabolite A1 was identified as an analog of M1 after oxidative defluorination, whereas both, A2 and A3, were identified as a reduced analog of M1 and parent, respectively, after addition of two hydrogen atoms at the isoxazole ring. In conclusion, CYP3A4 contributes to a relevant extent to ACT-1004-1239 disposition and two major circulating metabolites were observed in humans. Clinical Trial Registration: (https://ichgcp.net/clinical-trials-registry/NCT03869320) ClinicalTrials.gov Identifier NCT03869320.
Keywords: 14C-ACT-1004-1239; ADME; CXCR7; CYP3A4; accelerator mass spectrometry; first-in-human; microtracer.
Conflict of interest statement
The authors declare that this study was sponsored by Idorsia Pharmaceuticals Ltd. The sponsor was involved in the study design, collection, analysis, interpretation of data, the writing of this article/the decision to submit it for publication.
Copyright © 2022 Huynh, Seeland, Segrestaa, Gnerre, Hogeback, Meyer zu Schwabedissen, Dingemanse and Sidharta.
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