Zinc has been widely used as an anti-inflammatory and anti-arthritic agent for more than 3000 years. It has shown promising analgesic effect in a number of model systems. Previous studies found that zinc activated the pain-initiating TRPA1 channels and induced acute nocifensive behaviors. Therefore, zinc must execute its anti-nociceptive effect via alternative mechanisms. Our pilot studies show that pre-treatment of zinc desensitized TRPA1, suggesting that zinc can inhibit TRPA1 by inducing receptor desensitization like capsaicin to TRPV1. We also show that zinc suppressed TRPV1 function both in vitro and in vivo and genetic ablation of TRPA1 significantly reduced zinc inhibition of th TRPV1 function. The proposed experiments will test the hypothesis that extracellular zinc suppresses TRPA1/V1-mediated thermal and mechanical pain in both acute and chronic inflammatory models. We will investigate molecular determinants of zinc inhibition of TRPV1. We will also examine if TRPA1 activation is an upstream event of TRPV1 inhibition and test whether this regulatory mechanism is important for limiting zinc action in vivo using trpa1-/- mice and a specific TRPA1 blocker, HC-030031. The data resulting from these experiments will establish zinc as a novel anti-nociceptive agent by inhibiting two major pain-initiating TRP channels at the primary nociceptors and will reveal the molecular mechanisms by which zinc suppresses TRPV1 function. Our results will shed light on novel therapeutic strategies to target TRP channels for treatment of pain in the peripheral nociceptors without promoting on-target side effects in human patients.

Public Health Relevance

Pain results from complex processing of neural signals at different levels and is the most common reason for seeking medical assistance in the United States. Zinc has been used for anti-inflammatory and analgesic purposes in wound healing by humans for almost 3000 years but the mechanism of action is not fully understood. The proposed studies will investigate the regulation of pain-sensing transient receptor potential (TRP) channels (TRPA1 and TRPV1) in the sensory neurons by the transition metal zinc. By understanding how zinc acts on pain-sensing TRPA1 and TRPV1 channels we aim to establish it as a novel exogenous and endogenous analgesic that could be used to more specifically targeting sensory neurons with less side effects on other tissues.

National Institute of Health (NIH)
National Institute of General Medical Sciences (NIGMS)
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Neurotransporters, Receptors, and Calcium Signaling Study Section (NTRC)
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Nie, Zhongzhen
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Washington University
Schools of Medicine
Saint Louis
United States
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Shepherd, Andrew J; Mickle, Aaron D; Kadunganattil, Suraj et al. (2018) Parathyroid Hormone-Related Peptide Elicits Peripheral TRPV1-dependent Mechanical Hypersensitivity. Front Cell Neurosci 12:38
Luo, Jialie; Bavencoffe, Alexis; Yang, Pu et al. (2018) Zinc Inhibits TRPV1 to Alleviate Chemotherapy-Induced Neuropathic Pain. J Neurosci 38:474-483
Hibberd, Timothy J; Feng, Jing; Luo, Jialie et al. (2018) Optogenetic Induction of Colonic Motility in Mice. Gastroenterology 155:514-528.e6
Lakk, Monika; Young, Derek; Baumann, Jackson M et al. (2018) Polymodal TRPV1 and TRPV4 Sensors Colocalize but Do Not Functionally Interact in a Subpopulation of Mouse Retinal Ganglion Cells. Front Cell Neurosci 12:353
Xie, Zili; Hu, Hongzhen (2018) TRP Channels as Drug Targets to Relieve Itch. Pharmaceuticals (Basel) 11:
Luo, Jialie; Qian, Aihua; Oetjen, Landon K et al. (2018) TRPV4 Channel Signaling in Macrophages Promotes Gastrointestinal Motility via Direct Effects on Smooth Muscle Cells. Immunity 49:107-119.e4
Feng, Jing; Luo, Jialie; Yang, Pu et al. (2018) Piezo2 channel-Merkel cell signaling modulates the conversion of touch to itch. Science 360:530-533
Dryn, Dariia; Luo, Jialie; Melnyk, Mariia et al. (2018) Inhalation anaesthetic isoflurane inhibits the muscarinic cation current and carbachol-induced gastrointestinal smooth muscle contractions. Eur J Pharmacol 820:39-44
Luo, Jialie; Feng, Jing; Yu, Guang et al. (2018) Transient receptor potential vanilloid 4-expressing macrophages and keratinocytes contribute differentially to allergic and nonallergic chronic itch. J Allergy Clin Immunol 141:608-619.e7
Oetjen, Landon K; Mack, Madison R; Feng, Jing et al. (2017) Sensory Neurons Co-opt Classical Immune Signaling Pathways to Mediate Chronic Itch. Cell 171:217-228.e13

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