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Preclinical characterization of three transient receptor potential vanilloid receptor 1 antagonists for early use in human intradermal microdose analgesic studies
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy.ORCID iD: 0000-0003-4318-6039
Karolinska Inst, AlzeCure Fdn, Sci Pk, Huddinge, Sweden.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Medicinal Chemistry, Analytical Pharmaceutical Chemistry.
AstraZeneca R&D, Global Med Dev, Gaithersburg, MD 20878 USA.
2018 (English)In: European Journal of Pain, ISSN 1090-3801, E-ISSN 1532-2149, Vol. 22, no 5, p. 889-903Article in journal (Refereed) Published
Abstract [en]

Background

The transient receptor potential vanilloid receptor 1 (TRPV1) is a nonselective cation channel involved in the mediation of peripheral pain to the central nervous system. As such, the TRPV1 is an accessible molecular target that lends itself well to the understanding of nociceptive signalling. This study encompasses preclinical investigations of three molecules with the prospect to establish them as suitable analgesic model compounds in human intradermal pain relief studies.

Methods

The inhibitory effectiveness was evaluated by means of invitro assays, TRPV1 expressing Chinese hamster ovary cells (CHO-K1) and rat dorsal root ganglion cultures in fluorescent imaging plate reader and whole cell patch clamp systems, as well as invivo by capsaicin-evoked pain-related behavioural response studies in rat. Secondary pharmacology, pharmacokinetics and preclinical safety were also assessed.

Results

In vitro, all three compounds were effective at inhibiting capsaicin-activated TRPV1. The concentration producing 50% inhibition (IC50) determined was in the range of 3-32nmol/L and 10-501nmol/L using CHO-K1 and dorsal root ganglion cultures, respectively. In vivo, all compounds showed dose-dependent reduction in capsaicin-evoked pain-related behavioural responses in rat. None of the three compounds displayed any significant activity on any of the secondary targets tested. The compounds were also shown to be safe from a toxicological, drug metabolism and pharmacokinetic perspective, for usage in microgram doses in the human skin.

Conclusion

The investigated model compounds displayed ideal compound characteristics as pharmacological and translational tools to address efficacy on the human native TRPV1 target in human skin insitu.

Significance

This work details the pharmaceutical work-up of three TRPV1-active investigational compounds, to obtain regulatory approval, for subsequent use in humans. This fast and cost-effective preclinical development path may impact research beyond the pain management area, as it allows human target engagement information gathering early in drug development.

Place, publisher, year, edition, pages
2018. Vol. 22, no 5, p. 889-903
National Category
Pharmaceutical Sciences Pharmacology and Toxicology
Identifiers
URN: urn:nbn:se:uu:diva-354105DOI: 10.1002/ejp.1175ISI: 000430105000005PubMedID: 29377430OAI: oai:DiVA.org:uu-354105DiVA, id: diva2:1220791
Available from: 2018-06-19 Created: 2018-06-19 Last updated: 2018-06-19Bibliographically approved

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