2. Academic Validation
  3. In Pursuit of an Allosteric Human Tropomyosin Kinase A ( h TrkA) Inhibitor for Chronic Pain

In Pursuit of an Allosteric Human Tropomyosin Kinase A ( h TrkA) Inhibitor for Chronic Pain

  • ACS Med Chem Lett. 2021 Oct 25;12(11):1847-1852. doi: 10.1021/acsmedchemlett.1c00483.
Govindan Subramanian 1,  Brian Duclos 1,  Paul D Johnson 1,  Tracey Williams 1,  Jason T Ross 1,  Scott J Bowen 1,  Yaqi Zhu 1,  Julie A White 1,  Carolyn Hedke 1,  Dennis Huczek 1,  Wendy Collard 1,  Christopher Javens 1,  Rajendran Vairagoundar 1,  Tomasz Respondek 1,  Theresa Zachary 1,  Todd Maddux 1,  Mark R Cox 1,  Steven Kamerling 1,  Andrea J Gonzales 1
Affiliations

Affiliation

  • 1 Veterinary Medicine Research & Development, Zoetis, 333 Portage Street, Building 300, Kalamazoo, Michigan 49007, United States.
PMID: 34795875 DOI: 10.1021/acsmedchemlett.1c00483
Abstract

Human β-nerve growth factor (β-NGF) and its associated receptor, human tropomyosin receptor kinase A (hTrkA), have been demonstrated to be key factors in the perception of pain. However, efficacious small molecule therapies targeting the intracellularly located hTrkA kinase have not been explored thoroughly for pain management. Herein, we report the pharmacological properties of a selective hTrkA allosteric inhibitor, 1. 1 was shown to be active against the full length hTrkA, showing preferential binding for the inactive kinase, and was confirmed through the X-ray of hTrkA···1 bound complex. 1 was also found to inhibit β-NGF induced neurite outgrowth in rat PC12 cells. Daily oral administration of 1 improved the joint compression threshold of rats injected intra-articularly with monoiodoacetate over a 14-day period. The efficacy of 1 in a relevant chronic pain model of osteoarthritis coupled with in vitro confirmation of target mediation makes allosteric hTrkA inhibitors potential candidates for modulating pain.

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