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Sun H, Undem BJ. Selective KCNQ2/3 Potassium Channel Opener ICA-069673 Inhibits Excitability in Mouse Vagal Sensory Neurons. J Pharmacol Exp Ther 2024; 389:118-127. [PMID: 38290975 PMCID: PMC10949160 DOI: 10.1124/jpet.123.001959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 01/03/2024] [Accepted: 01/18/2024] [Indexed: 02/01/2024] Open
Abstract
Heightened excitability of vagal sensory neurons in inflammatory visceral diseases contributes to unproductive and difficult-to-treat neuronally based symptoms such as visceral pain and dysfunction. Identification of targets and modulators capable of regulating the excitability of vagal sensory neurons may lead to novel therapeutic options. KCNQ1-KCNQ5 genes encode KV7.1-7.5 potassium channel α-subunits. Homotetrameric or heterotetrameric KV7.2-7.5 channels can generate the so-called M-current (IM) known to decrease the excitability of neurons including visceral sensory neurons. This study aimed to address the hypothesis that KV7.2/7.3 channels are key regulators of vagal sensory neuron excitability by evaluating the effects of KCNQ2/3-selective activator, ICA-069673, on IM in mouse nodose neurons and determining its effects on excitability and action potential firings using patch clamp technique. The results showed that ICA-069673 enhanced IM density, accelerated the activation, and delayed the deactivation of M-channels in a concentration-dependent manner. ICA-069673 negatively shifted the voltage-dependent activation of IM and increased the maximal conductance. Consistent with its effects on IM, ICA-069673 induced a marked hyperpolarization of resting potential and reduced the input resistance. The hyperpolarizing effect was more pronounced in partially depolarized neurons. Moreover, ICA-069673 caused a 3-fold increase in the minimal amount of depolarizing current needed to evoke an action potential, and significantly limited the action potential firings in response to sustained suprathreshold stimulations. ICA-069673 had no effect on membrane currents when Kcnq2 and Kcnq3 were deleted. These results indicate that opening KCNQ2/3-mediated M-channels is sufficient to suppress the excitability and enhance spike accommodation in vagal visceral sensory neurons. SIGNIFICANCE STATEMENT: This study supports the hypothesis that selectively activating KCNQ2/3-mediated M-channels is sufficient to suppress the excitability and action potential firings in vagal sensory neurons. These results provide evidence in support of further investigations into the treatment of various visceral disorders that involve nociceptor hyperexcitability with selective KCNQ2/3 M-channel openers.
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Affiliation(s)
- Hui Sun
- Division of Allergy and Clinical Immunology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Bradley J Undem
- Division of Allergy and Clinical Immunology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
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Kim JS, Ru F, Meeker S, Undem BJ. Direct activation of airway sensory C-fibers by SARS-CoV-2 S1 spike protein. Physiol Rep 2023; 11:e15900. [PMID: 38123162 PMCID: PMC10733116 DOI: 10.14814/phy2.15900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 12/02/2023] [Accepted: 12/04/2023] [Indexed: 12/23/2023] Open
Abstract
Respiratory viral infection can lead to activation of sensory afferent nerves as indicated by the consequential sore throat, sneezing, coughing, and reflex secretions. In addition to causing troubling symptoms, sensory nerve activation likely accelerates viral spreading. The mechanism how viruses activate sensory nerve terminals during infection is unknown. In this study, we investigate whether coronavirus spike protein activates sensory nerves terminating in the airways. We used isolated vagally-innervated mouse trachea-lung preparation for two-photon microscopy and extracellular electrophysiological recordings. Using two-photon Ca2+ imaging, we evaluated a total number of 786 vagal bronchopulmonary nerves in six experiments. Approximately 49% of the sensory fibers were activated by S1 protein (4 μg/mL intratracheally). Extracellular nerve recording showed the S1 protein evoked action potential discharge in sensory C-fibers; of 39 airway C-fibers (one fiber per mouse), 17 were activated. Additionally, Fura-2 Ca2+ imaging was performed on neurons dissociated from vagal sensory ganglia (n = 254 from 22 mice). The result showed that 63% of neurons responded to S1 protein. SARS-CoV-2 S1 protein can lead to direct activation of sensory C-fiber nerve terminals in the bronchopulmonary tract. Direct activation of C-fibers may contribute to coronavirus symptoms, and amplify viral spreading in a population.
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Affiliation(s)
- Joyce S. Kim
- Department of MedicineJohns Hopkins University School of MedicineBaltimoreMarylandUSA
| | - Fei Ru
- Department of MedicineJohns Hopkins University School of MedicineBaltimoreMarylandUSA
| | - Sonya Meeker
- Department of MedicineJohns Hopkins University School of MedicineBaltimoreMarylandUSA
| | - Bradley J. Undem
- Department of MedicineJohns Hopkins University School of MedicineBaltimoreMarylandUSA
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Kim JS, Sun H, Meeker S, Undem BJ. Role of Na V 1.9 in inflammatory mediator-induced activation of mouse airway vagal C-fibres. J Physiol 2023; 601:1139-1150. [PMID: 36750759 PMCID: PMC10023385 DOI: 10.1113/jp283751] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 01/23/2023] [Indexed: 02/09/2023] Open
Abstract
The influence of NaV 1.9 on inflammatory mediator-induced activation of airway vagal nodose C-fibres was evaluated by comparing responses in wild-type versus NaV 1.9-/- mice. A single-cell RT-PCR analysis indicated that virtually all nodose C-fibre neurons expressed NaV 1.9 (SCN11A) mRNA. Using extracellular electrophysiological recordings in an isolated vagally innervated mouse trachea-lung preparation, it was noted that mediators acting via G protein-coupled receptors (PAR2), or ionotropic receptors (P2×3) were 70-85% less effective in evoking action potential discharge in the absence of NaV 1.9. However, there was no difference in action potential discharge between wild-type and NaV 1.9-/- when the stimulus was a rapid punctate mechanical stimulus. An analysis of the passive and active properties of isolated nodose neurons revealed no difference between neurons from wild-type and NaV 1.9-/- mice, with the exception of a modest difference in the duration of the afterhyperpolarization. There was also no difference in the amount of current required to evoke action potentials (rheobase) or the action potential voltage threshold. The inward current evoked by the chemical mediator by a P2×3 agonist was the same in wild-type versus NaV 1.9-/- neurons. However, the current was sufficient to evoke action potential only in the wild-type neurons. The data support the speculation that NaV 1.9 could be an attractive therapeutic target for inflammatory airway disease by selectively inhibiting inflammatory mediator-associated vagal C-fibre activation. KEY POINTS: Inflammatory mediators were much less effective in activating the terminals of vagal airway C-fibres in mice lacking NaV 1.9. The active and passive properties of nodose neurons were the same between wild-type neurons and NaV 1.9-/- neurons. Nerves lacking NaV 1.9 responded, normally, with action potential discharge to rapid punctate mechanical stimulation of the terminals or the rapid stimulation of the cell bodies with inward current injections. NaV 1.9 channels could be an attractive target to selectively inhibit vagal nociceptive C-fibre activation evoked by inflammatory mediators without blocking the nerves' responses to the potentially hazardous stimuli associated with aspiration.
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Affiliation(s)
- Joyce S Kim
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Hui Sun
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Sonya Meeker
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Bradley J Undem
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Patil MJ, Huang Y, Yu M, Dong X, Undem BJ, Yu S. Ginger Constituent 6-Shogaol Attenuates Vincristine-Induced Activation of Mouse Gastroesophageal Vagal Afferent C-Fibers. Molecules 2022; 27:7465. [PMID: 36364288 PMCID: PMC9654566 DOI: 10.3390/molecules27217465] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/25/2022] [Accepted: 10/29/2022] [Indexed: 11/06/2022] Open
Abstract
Chemotherapeutic agent-induced nausea and vomiting are the severe adverse effects that are induced by their stimulations on the peripheral and/or central emetic nerve pathways. Even though ginger has been widely used as an herbal medicine to treat emesis, mechanisms underlying its neuronal actions are still less clear. The present study aimed to determine the chemotherapeutic agent vincristine-induced effect on gastroesophageal vagal afferent nerve endings and the potential inhibitory role of ginger constituent 6-shogaol on such response. Two-photon neuron imaging studies were performed in ex vivo gastroesophageal-vagal preparations from Pirt-GCaMP6 transgenic mice. Vincristine was applied to the gastroesophageal vagal afferent nerve endings, and the evoked calcium influxes in their intact nodose ganglion neuron somas were recorded. The responsive nodose neuron population was first characterized, and the inhibitory effects of 5-HT3 antagonist palonosetron, TRPA1 antagonist HC-030031, and ginger constituent 6-shogaol were then determined. Vincristine application at gastroesophageal vagal afferent nerve endings elicited intensive calcium influxes in a sub-population of vagal ganglion neurons. These neurons were characterized by their positive responses to P2X2/3 receptor agonist α,β-methylene ATP and TRPA1 agonist cinnamaldehyde, suggesting their nociceptive placodal nodose C-fiber neuron lineages. Pretreatment with TRPA1 selective blocker HC-030031 inhibited vincristine-induced calcium influxes in gastroesophageal nodose C-fiber neurons, indicating that TRPA1 played a functional role in mediating vincristine-induced activation response. Such inhibitory effect was comparable to that from 5-HT3 receptor antagonist palonosetron. Alternatively, pretreatment with ginger constituent 6-shogaol significantly attenuated vincristine-induced activation response. The present study provides new evidence that chemotherapeutic agent vincristine directly activates vagal nodose nociceptive C-fiber neurons at their peripheral nerve endings in the upper gastrointestinal tract. This activation response requires both TRPA1 and 5-HT3 receptors and can be attenuated by ginger constituent 6-shogaol.
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Affiliation(s)
- Mayur J. Patil
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Yongming Huang
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Mingwei Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Xinzhong Dong
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Bradley J. Undem
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Shaoyong Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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Sun H, Patil MJ, Ru F, Meeker S, Undem BJ. The Braking K
V
1/D‐type Potassium Channels Regulate the Excitability of Bronchopulmonary Vagal Afferent Nerves. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r5159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hui Sun
- Johns Hopkins UniversityBaltimoreMD
| | | | - Fei Ru
- Johns Hopkins UniversityBaltimoreMD
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Kim JS, Sun H, Meeker S, Undem BJ. Roles of Nav1.9 in inflammatory Mediator‐induced Activation of Vagal C‐fibers Innervating Mouse Lungs. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r3422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Hui Sun
- MedicineJohns Hopkins UniversityBaltimoreMD
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Sun H, Patil MJ, Ru F, Meeker S, Undem BJ. K
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1/D‐type potassium channels inhibit the excitability of bronchopulmonary vagal afferent nerves. J Physiol 2022; 600:2953-2971. [PMID: 35430729 PMCID: PMC9203938 DOI: 10.1113/jp282803] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 04/04/2022] [Indexed: 11/10/2022] Open
Abstract
Abstract The KV1/D‐type potassium current (ID) is an important determinant of neuronal excitability. This study explored whether and how ID channels regulate the activation of bronchopulmonary vagal afferent nerves. The single‐neuron RT‐PCR assay revealed that nearly all mouse bronchopulmonary nodose neurons expressed the transcripts of α‐dendrotoxin (α‐DTX)‐sensitive, ID channel‐forming KV1.1, KV1.2 and/or KV1.6 α‐subunits, with the expression of KV1.6 being most prevalent. Patch‐clamp recordings showed that ID, defined as the α‐DTX‐sensitive K+ current, activated at voltages slightly more negative than the resting membrane potential in lung‐specific nodose neurons and displayed little inactivation at subthreshold voltages. Inhibition of ID channels by α‐DTX depolarized the lung‐specific nodose neurons and caused an increase in input resistance, decrease in rheobase, as well as increase in action potential number and firing frequency in response to suprathreshold current steps. Application of α‐DTX to the lungs via trachea in the mouse ex vivo vagally innervated trachea–lungs preparation led to action potential discharges in nearly half of bronchopulmonary nodose afferent nerve fibres, including nodose C‐fibres, as detected by the two‐photon microscopic Ca2+ imaging technique and extracellular electrophysiological recordings. In conclusion, ID channels act as a critical brake on the activation of bronchopulmonary vagal afferent nerves by stabilizing the membrane potential, counterbalancing the subthreshold depolarization and promoting the adaptation of action potential firings. Down‐regulation of ID channels, as occurs in various inflammatory diseases, may contribute to the enhanced C‐fibre activity in airway diseases that are associated with excessive coughing, dyspnoea, and reflex bronchospasm and secretions. Key points The α‐dendrotoxin (α‐DTX)‐sensitive D‐type K+ current (ID) is an important determinant of neuronal excitability. Nearly all bronchopulmonary nodose afferent neurons in the mouse express ID and the transcripts of α‐DTX‐sensitive, ID channel‐forming KV1.1, KV1.2 and/or KV1.6 α‐subunits. Inhibition of ID channels by α‐DTX depolarizes the bronchopulmonary nodose neurons, reduces the minimal depolarizing current needed to evoke an action potential (AP) and increases AP number and AP firing frequency in response to suprathreshold stimulations. Application of α‐DTX to the lungs ex vivo elicits AP discharges in about half of bronchopulmonary nodose C‐fibre terminals.
Our novel finding that ID channels act as a critical brake on the activation of bronchopulmonary vagal afferent nerves suggests that their down‐regulation, as occurs in various inflammatory diseases, may contribute to the enhanced C‐fibre activity in airway inflammation associated with excessive respiratory symptoms.
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Affiliation(s)
- Hui Sun
- Division of Allergy and Clinical Immunology Department of Medicine Johns Hopkins University School of Medicine 5501 Hopkins Bayview Circle Baltimore 21224
| | - Mayur J. Patil
- Division of Allergy and Clinical Immunology Department of Medicine Johns Hopkins University School of Medicine 5501 Hopkins Bayview Circle Baltimore 21224
| | - Fei Ru
- Division of Allergy and Clinical Immunology Department of Medicine Johns Hopkins University School of Medicine 5501 Hopkins Bayview Circle Baltimore 21224
| | - Sonya Meeker
- Division of Allergy and Clinical Immunology Department of Medicine Johns Hopkins University School of Medicine 5501 Hopkins Bayview Circle Baltimore 21224
| | - Bradley J. Undem
- Division of Allergy and Clinical Immunology Department of Medicine Johns Hopkins University School of Medicine 5501 Hopkins Bayview Circle Baltimore 21224
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Kollarik M, Ru F, Pavelkova N, Mulcahy J, Hunter J, Undem BJ. Role of Na V 1.7 in action potential conduction along human bronchial vagal afferent C-fibres. Br J Pharmacol 2022; 179:242-251. [PMID: 34634134 DOI: 10.1111/bph.15686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 07/20/2021] [Accepted: 09/17/2021] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND AND PURPOSE The purpose of this study was to determine the role of NaV 1.7 in action potential conduction in C-fibres in the bronchial branches of the human vagus nerve. EXPERIMENTAL APPROACH Bronchial branches of the vagus nerve were dissected from human donor tissue. The C-wave of the electrically evoked compound action potential was quantified in the absence and presence of increasing concentrations of the selective NaV 1.7 blocking drugs, PF-05089771 and ST-2262, as well as the NaV 1.1, 1.2, and 1.3 blocking drug ICA121-431. The efficacy and potency of these inhibitors were compared to the standard NaV 1 blocker, tetrodotoxin. We then compared the relative potencies of the NaV 1 blockers in inhibiting the C-wave of the compound action potential, with their ability to inhibit parasympathetic cholinergic contraction of human isolated bronchi, a response previously shown to be strictly dependent on NaV 1.7 channels. KEY RESULTS The selective NaV 1.7 blockers inhibited the C-wave of the compound action potential with potencies similar to that observed in the NaV 1.7 bronchial contractions assay. Using rt-PCR, we noted that NaV 1.7 mRNA was strongly expressed and transported down the vagus nerve bundles. CONCLUSIONS AND IMPLICATIONS NaV 1.7 blockers can prevent action potential conduction in the majority of vagal C-fibres arising from human bronchi. Blockers of NaV 1.7 channels may therefore have value in inhibiting the responses to excessive airway C-fibre activation in inflammatory airway disease, responses that include coughing as well as reflex bronchoconstriction and secretions.
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Affiliation(s)
- Marian Kollarik
- Department of Molecular Pharmacology and Physiology, University of South Florida, Tampa, FL, USA
| | - Fei Ru
- Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Nikoleta Pavelkova
- Department of Molecular Pharmacology and Physiology, University of South Florida, Tampa, FL, USA
| | - John Mulcahy
- SiteOne Therapeutics, South San Francisco, CA, USA
| | - John Hunter
- SiteOne Therapeutics, South San Francisco, CA, USA
| | - Bradley J Undem
- Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
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Abstract
Airway function is under constant neurophysiological control, in order to maximize airflow and gas exchange and to protect the airways from aspiration, damage, and infection. There are multiple sensory nerve subtypes, whose disparate functions provide a wide array of sensory information into the CNS. Activation of these subtypes triggers specific reflexes, including cough and alterations in autonomic efferent control of airway smooth muscle, secretory cells, and vasculature. Importantly, every aspect of these reflex arcs can be impacted and altered by local inflammation caused by chronic lung disease such as asthma, bronchitis, and infections. Excessive and inappropriate activity in sensory and autonomic nerves within the airways is thought to contribute to the morbidity and symptoms associated with lung disease.
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Affiliation(s)
- Thomas E Taylor-Clark
- Department of Molecular Pharmacology & Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, United States
| | - Bradley J Undem
- Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, United States.
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Yu L, Tsuji K, Ujihara I, Liu Q, Pavelkova N, Tsujimura T, Inoue M, Meeker S, Nisenbaum E, McDermott JS, Krajewski J, Undem BJ, Kollarik M, Canning BJ. Antitussive effects of Na V 1.7 blockade in Guinea pigs. Eur J Pharmacol 2021; 907:174192. [PMID: 34010618 DOI: 10.1016/j.ejphar.2021.174192] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 05/07/2021] [Accepted: 05/12/2021] [Indexed: 01/25/2023]
Abstract
Our previous studies implicated the voltage-gated sodium channel subtype NaV 1.7 in the transmission of action potentials by the vagal afferent nerves regulating cough and thus identified this channel as a rational therapeutic target for antitussive therapy. But it is presently unclear whether a systemically administered small molecule inhibitor of NaV 1.7 conductance can achieve therapeutic benefit in the absence of side effects on cardiovascular function, gastrointestinal motility or respiration. To this end, we have evaluated the antitussive effects of the NaV 1.7 selective blocker Compound 801 administered systemically in awake guinea pigs or administered topically in anesthetized guinea pigs. We also evaluated the antitussive effects of ambroxol, a low affinity NaV blocker modestly selective for tetrodotoxin resistant NaV subtypes. Both Compound 801 and ambroxol dose-dependently inhibited action potential conduction in guinea pig vagus nerves (assessed by compound potential), with ambroxol nearly 100-fold less potent than the NaV 1.7 selective Compound 801 in this and other NaV 1.7-dependent guinea pig and human tissue-based assays. Both drugs also inhibited citric acid evoked coughing in awake or anesthetized guinea pigs, with potencies supportive of an NaV 1.7-dependent mechanism. Notably, however, the antitussive effects of systemically administered Compound 801 were accompanied by hypotension and respiratory depression. Given the antitussive effects of topically administered Compound 801, we speculate that the likely insurmountable side effects on blood pressure and respiratory drive associated with systemic dosing make topical formulations a viable and perhaps unavoidable therapeutic strategy for targeting NaV 1.7 in cough.
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Affiliation(s)
- Li Yu
- Department of Pulmonary and Critical Care Medicine, Tongji Hospital, Tongii University School of Medicine, Shanghai, 200065, China
| | - Kojun Tsuji
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Izumi Ujihara
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Qi Liu
- Johns Hopkins Asthma and Allergy Center, 5501 Hopkins Bayview Circle, Baltimore, MD, 21224, USA
| | - Nikoleta Pavelkova
- Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Takanori Tsujimura
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Makoto Inoue
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Sonya Meeker
- Johns Hopkins Asthma and Allergy Center, 5501 Hopkins Bayview Circle, Baltimore, MD, 21224, USA
| | - Eric Nisenbaum
- Lilly Research Laboratories, Indianapolis, IN, 46285, USA
| | | | - Jeff Krajewski
- Lilly Research Laboratories, Indianapolis, IN, 46285, USA
| | - Bradley J Undem
- Johns Hopkins Asthma and Allergy Center, 5501 Hopkins Bayview Circle, Baltimore, MD, 21224, USA
| | - Marian Kollarik
- Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Brendan J Canning
- Johns Hopkins Asthma and Allergy Center, 5501 Hopkins Bayview Circle, Baltimore, MD, 21224, USA.
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Yu X, Hu Y, Yu M, Undem BJ, Yu S. Deoxycholic acid activates and sensitizes vagal nociceptive afferent C-fibers in guinea pig esophagus. Am J Physiol Gastrointest Liver Physiol 2021; 321:G149-G156. [PMID: 34160291 PMCID: PMC8410107 DOI: 10.1152/ajpgi.00187.2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Bile acid reflux in the esophagus plays a role in the pathogenesis of certain esophageal disorders, where it can induce esophageal pain and heartburn. The present study aimed to determine whether bile acid, deoxycholic acid (DCA), directly activates and sensitizes esophageal vagal nociceptive afferent C-fiber subtypes. DCA-elicited effects on vagal nodose and jugular neurons were studied by calcium imaging. Its effects on esophageal-labeled nodose and jugular neurons were then determined by patch-clamp recording. At nodose and jugular C-fiber nerve endings in the esophagus, DCA-evoked action potentials (APs) were compared by extracellular single-unit recordings in ex vivo esophageal-vagal preparations. DCA application induced calcium influxes in nodose and jugular neurons and elicited inward currents in esophageal-labeled nodose and jugular neurons. In the presence of DCA, the current densities elicited by capsaicin were enhanced in those labeled neurons. Consistently, DCA perfusion at nerve terminals in the esophagus evoked APs in about 50% of esophageal nodose and jugular C-fibers. In DCA-sensitive C-fibers, DCA perfusion also sensitized the fibers such that the subsequent response to capsaicin was amplified. Collectively, these results provide new evidence that DCA directly activates and sensitizes nociceptive nodose and jugular C-fibers in the esophagus. Such activation and sensitization effects may contribute to bile acid-induced esophageal nociceptive symptoms that are refractory to proton-pump inhibitor therapy.NEW & NOTEWORTHY Bile acid reflux in the esophagus can induce pain and heartburn in certain esophageal disorders, but the underlying neuronal mechanism is still unclear. The present study demonstrated that bile acid, deoxycholic acid (DCA), directly activates esophageal vagal afferent nodose and jugular nociceptive C-fibers and sensitizes their response to capsaicin. Such effects may contribute to bile acid-induced esophageal nociceptive symptoms that refractory to proton-pump inhibitors (PPIs) therapy.
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Affiliation(s)
- Xiaoyun Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Youtian Hu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Mingwei Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Bradley J. Undem
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Shaoyong Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
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Yu M, Chang C, Undem BJ, Yu S. Capsaicin-Sensitive Vagal Afferent Nerve-Mediated Interoceptive Signals in the Esophagus. Molecules 2021; 26:3929. [PMID: 34203134 PMCID: PMC8271978 DOI: 10.3390/molecules26133929] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 06/23/2021] [Accepted: 06/24/2021] [Indexed: 01/14/2023] Open
Abstract
Heartburn and non-cardiac chest pain are the predominant symptoms in many esophageal disorders, such as gastroesophageal reflux disease (GERD), non-erosive reflux disease (NERD), functional heartburn and chest pain, and eosinophilic esophagitis (EoE). At present, neuronal mechanisms underlying the process of interoceptive signals in the esophagus are still less clear. Noxious stimuli can activate a subpopulation of primary afferent neurons at their nerve terminals in the esophagus. The evoked action potentials are transmitted through both the spinal and vagal pathways to their central terminals, which synapse with the neurons in the central nervous system to induce esophageal nociception. Over the last few decades, progress has been made in our understanding on the peripheral and central neuronal mechanisms of esophageal nociception. In this review, we focus on the roles of capsaicin-sensitive vagal primary afferent nodose and jugular C-fiber neurons in processing nociceptive signals in the esophagus. We briefly compare their distinctive phenotypic features and functional responses to mechanical and chemical stimulations in the esophagus. Then, we summarize activation and/or sensitization effects of acid, inflammatory cells (eosinophils and mast cells), and mediators (ATP, 5-HT, bradykinin, adenosine, S1P) on these two nociceptive C-fiber subtypes. Lastly, we discuss the potential roles of capsaicin-sensitive esophageal afferent nerves in processing esophageal sensation and nociception. A better knowledge of the mechanism of nociceptive signal processes in primary afferent nerves in the esophagus will help to develop novel treatment approaches to relieve esophageal nociceptive symptoms, especially those that are refractory to proton pump inhibitors.
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Affiliation(s)
| | | | | | - Shaoyong Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Ross Research Building, 720 Rutland Ave, Baltimore, MD 21205, USA; (M.Y.); (C.C.); (B.J.U.)
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Dispenza MC, Krier-Burris RA, Chhiba KD, Undem BJ, Robida PA, Bochner BS. Bruton's tyrosine kinase inhibition effectively protects against human IgE-mediated anaphylaxis. J Clin Invest 2021; 130:4759-4770. [PMID: 32484802 DOI: 10.1172/jci138448] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 05/28/2020] [Indexed: 01/30/2023] Open
Abstract
No known therapies can prevent anaphylaxis. Bruton's tyrosine kinase (BTK) is an enzyme thought to be essential for high-affinity IgE receptor (FcεRI) signaling in human cells. We tested the hypothesis that FDA-approved BTK inhibitors (BTKis) would prevent IgE-mediated responses including anaphylaxis. We showed that irreversible BTKis broadly prevented IgE-mediated degranulation and cytokine production in primary human mast cells and blocked allergen-induced contraction of isolated human bronchi. To address their efficacy in vivo, we created and used what we believe to be a novel humanized mouse model of anaphylaxis that does not require marrow ablation or human tissue implantation. After a single intravenous injection of human CD34+ cells, NSG-SGM3 mice supported the population of mature human tissue-resident mast cells and basophils. These mice showed excellent responses during passive systemic anaphylaxis using human IgE to selectively evoke human mast cell and basophil activation, and response severity was controllable by alteration of the amount of allergen used for challenge. Remarkably, pretreatment with just 2 oral doses of the BTKi acalabrutinib completely prevented moderate IgE-mediated anaphylaxis in these mice and also significantly protected against death during severe anaphylaxis. Our data suggest that BTKis may be able to prevent anaphylaxis in humans by inhibiting FcεRI-mediated signaling.
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Affiliation(s)
- Melanie C Dispenza
- Division of Allergy and Clinical Immunology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,Division of Allergy and Immunology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Rebecca A Krier-Burris
- Division of Allergy and Immunology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Krishan D Chhiba
- Division of Allergy and Immunology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Bradley J Undem
- Division of Allergy and Clinical Immunology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Piper A Robida
- Division of Allergy and Immunology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Bruce S Bochner
- Division of Allergy and Immunology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
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14
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Ru F, Pavelkova N, Krajewski JL, McDermott JS, Undem BJ, Kollarik M. Stimulus intensity-dependent recruitment of Na V1 subunits in action potential initiation in nerve terminals of vagal C-fibers innervating the esophagus. Am J Physiol Gastrointest Liver Physiol 2020; 319:G443-G453. [PMID: 32726130 PMCID: PMC7654645 DOI: 10.1152/ajpgi.00122.2019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We investigated voltage-gated sodium channel (NaV1) subunits that regulate action potential initiation in the nerve terminals of vagal nodose C-fibers innervating the esophagus. Extracellular single fiber recordings were made from the nodose C-fibers, with mechanically sensitive nerve terminals in the isolated innervated guinea pig esophagus. NaV1 inhibitors were selectively delivered to the tissue-containing nerve terminals. Graded esophageal distention was used for mechanical stimulation. The NaV1.7 inhibitor PF-05089771 nearly abolished action potential initiation in response to low levels of esophageal distention but only partially inhibited the response to higher levels of esophageal distention. The PF-05089771-insensitive component of the response progressively increased (up to ≈50%) with increasing esophageal distention and was abolished by tetrodotoxin (TTX). In addition to NaV1.7, nodose C-fiber [transient receptor potential channel-vanilloid subfamily member 1 (TRPV1)-positive] neurons retrogradely labeled from the esophagus expressed mRNA for multiple TTX-sensitive NaV1s. The group NaV1.1, NaV1.2, and NaV1.3 inhibitor ICA-121431 inhibited but did not abolish the PF-05089771-insensitive component of the response to high level of esophageal distention. However, combination of ICA-121431 with compound 801, which also inhibits NaV1.7 and NaV1.6, nearly abolished the response to the high level of esophageal distention. Our data indicate that the action potential initiation in esophageal nodose C-fibers evoked by low (innocuous) levels of esophageal distention is mediated by NaV1.7. However, the response evoked by higher (noxious) levels of esophageal distention has a progressively increasing NaV1.7-independent component that involves multiple TTX-sensitive NaV1s. The stimulus intensity-dependent recruitment of NaV1s may offer novel opportunities for strategic targeting of NaV1 subunits for inhibition of nociceptive signaling in visceral C-fibers.NEW & NOTEWORTHY We report that pharmacologically distinguishable voltage-gated sodium channels (NaV1) mediate action potential initiation at low (innocuous) versus high (noxious) intensity of esophageal distention in nerve terminals of vagal nodose C-fibers. Action potential initiation at low intensity is entirely dependent on NaV1.7; however, additional tetrodotoxin (TTX)-sensitive NaV1s are recruited at higher intensity of distention. This is the first demonstration that NaV1s underlying action potential initiation in visceral C-fibers depend on the intensity of the stimulus.
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Affiliation(s)
- Fei Ru
- 1Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Nikoleta Pavelkova
- 2University of South Florida, Morsani College of Medicine, Tampa, Florida
| | | | | | - Bradley J. Undem
- 1Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Marian Kollarik
- 2University of South Florida, Morsani College of Medicine, Tampa, Florida
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15
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Patil MJ, Ru F, Sun H, Wang J, Kolbeck RR, Dong X, Kollarik M, Canning BJ, Undem BJ. Acute activation of bronchopulmonary vagal nociceptors by type I interferons. J Physiol 2020; 598:5541-5554. [PMID: 32924209 DOI: 10.1113/jp280276] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 08/17/2020] [Indexed: 12/14/2022] Open
Abstract
KEY POINTS Type I interferon receptors are expressed by the majority of vagal C-fibre neurons innervating the respiratory tract Interferon alpha and beta acutely and directly activate vagal C-fibers in the airways. The interferon-induced activation of C-fibers occurs secondary to stimulation of type 1 interferon receptors Type 1 interferons may contribute to the symptoms as well as the spread of respiratory viral infections by causing coughing and other defensive reflexes associated with vagal C-fibre activation ABSTRACT: We evaluated the ability of type I interferons to acutely activate airway vagal afferent nerve terminals in mouse lungs. Using single cell RT-PCR of lung-specific vagal neurons we found that IFNAR1 and IFNAR2 were expressed in 70% of the TRPV1-positive neurons (a marker for vagal C-fibre neurons) and 44% of TRPV1-negative neurons. We employed an ex vivo vagal innervated mouse trachea-lung preparation to evaluate the effect of interferons in directly activating airway nerves. Utilizing 2-photon microscopy of the nodose ganglion neurons from Pirt-Cre;R26-GCaMP6s mice we found that applying IFNα or IFNβ to the lungs acutely activated the majority of vagal afferent nerve terminals. When the type 1 interferon receptor, IFNAR1, was blocked with a blocking antibody the response to IFNβ was largely inhibited. The type 2 interferon, IFNγ, also activated airway nerves and this was not inhibited by the IFNAR1 blocking antibody. The Janus kinase inhibitor GLPG0634 (1 μm) virtually abolished the nerve activation caused by IFNβ. Consistent with the activation of vagal afferent C-fibers, infusing IFNβ into the mouse trachea led to defensive breathing reflexes including apneas and gasping. These reflexes were prevented by pretreatment with an IFN type-1 receptor blocking antibody. Finally, using whole cell patch-clamp electrophysiology of lung-specific neurons we found that IFNβ (1000 U ml-1 ) directly depolarized the membrane potential of isolated nodose neurons, in some cases beyond to action potential threshold. This acute non-genomic activation of vagal sensory nerve terminals by interferons may contribute to the incessant coughing that is a hallmark of respiratory viral infections.
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Affiliation(s)
- Mayur J Patil
- The Johns Hopkins School of Medicine Departments of Medicine, Baltimore, MD
| | - Fei Ru
- The Johns Hopkins School of Medicine Departments of Medicine, Baltimore, MD
| | - Hui Sun
- The Johns Hopkins School of Medicine Departments of Medicine, Baltimore, MD
| | - Jingya Wang
- AstraZeneca BioPharmaceuticals R&D Gaithersburg, MD
| | | | - Xinzhong Dong
- The Johns Hopkins School of Medicine Departments of Neuroscience, Baltimore, MD
| | - Marian Kollarik
- The Johns Hopkins School of Medicine Departments of Medicine, Baltimore, MD
| | - Brendan J Canning
- The Johns Hopkins School of Medicine Departments of Medicine, Baltimore, MD
| | - Bradley J Undem
- The Johns Hopkins School of Medicine Departments of Medicine, Baltimore, MD
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16
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Jurcakova D, Undem BJ. Activation of Nociceptive C‐fiber Subtypes in Mouse Skin by Bee Venoms. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.02694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Gujarati NA, Undem BJ, Korlipara VL. Design, Synthesis, and Evaluation of Isoquinoline Ureas as TRPV1 Antagonists. Med Chem 2020; 16:202-211. [DOI: 10.2174/1573406415666190626130453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 05/06/2019] [Accepted: 06/09/2019] [Indexed: 11/22/2022]
Abstract
Background:
The inhibition of transient receptor potential vanilloid receptor 1
(TRPV1) has emerged as a novel approach for the treatment of various pain states. Pyrrolidinyl
urea, SB 705498 with pKb = 7.3 in guinea pig TRPV1 receptor has been investigated in Phase II
clinical trials for pain and chronic cough. Another heteroaryl urea derivative, A-425619 1, has
been reported to be a potent and selective TRPV1 antagonist of capsaicin-evoked receptor activation
with an IC50 value of 4 nM in hTRPV1.
Objective:
A series of thirteen A-425619 1 analogues with modifications centered around the Cregion
were synthesized to understand the binding site characteristics of TRPV1 receptors.
Method:
We synthesized a series of isoquinoline ureas and evaluated their antagonist potency using
smooth muscle assay using guinea pig trachea along with the evaluation of the molecular properties
and molecular modeling using CoMFA studies.
Results:
p-Chloro 4, p-bromo 5, m-isothiocyanate 15, and p-isothiocyanate 16 derivatives were
found to be the most potent members of the series with pKb values in the range of 7.3-7.4 in the
functional assay using guinea pig trachea. The lead compound A-425619 1 exhibited a pKb value
of 8.1 in this assay.
Conclusion:
The para-substituted analogues were found to be more potent than the ortho- and
meta- analogues in the biological assay. This observation was further supported by molecular
modeling studies using CoMFA.
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Affiliation(s)
- Nehaben A. Gujarati
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, United States
| | - Bradley J. Undem
- Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD 21224, United States
| | - Vijaya L. Korlipara
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, United States
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18
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Undem BJ, Sun H. Molecular/Ionic Basis of Vagal Bronchopulmonary C-Fiber Activation by Inflammatory Mediators. Physiology (Bethesda) 2020; 35:57-68. [PMID: 31799905 PMCID: PMC6985783 DOI: 10.1152/physiol.00014.2019] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 05/30/2019] [Accepted: 06/03/2019] [Indexed: 12/11/2022] Open
Abstract
Stimulation of bronchopulmonary vagal afferent C fibers by inflammatory mediators can lead to coughing, chest tightness, and changes in breathing pattern, as well as reflex bronchoconstriction and secretions. These responses serve a defensive function in healthy lungs but likely contribute to many of the signs and symptoms of inflammatory airway diseases. A better understanding of the mechanisms underlying the activation of bronchopulmonary C-fiber terminals may lead to novel therapeutics that would work in an additive or synergic manner with existing anti-inflammatory strategies.
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Affiliation(s)
| | - Hui Sun
- Johns Hopkins University, Baltimore, Maryland
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19
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Sun H, Meeker S, Undem BJ. Role of TRP channels in G q-coupled protease-activated receptor 1-mediated activation of mouse nodose pulmonary C-fibers. Am J Physiol Lung Cell Mol Physiol 2019; 318:L192-L199. [PMID: 31664854 DOI: 10.1152/ajplung.00301.2019] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
We evaluated the mechanisms underlying protease-activated receptor 1 (PAR1)-mediated activation of nodose C-fibers in mouse lungs. The PAR1-induced action potential discharge at the terminals was strongly inhibited in phospholipase C-β3 (PLCβ3)-deficient animals. At the level of the cell soma, PAR1 activation led to an increase in cytosolic calcium that was largely inhibited by transient receptor potential (TRP) A1 antagonism. Patch-clamp recordings, however, revealed that neither TRPA1 nor TRPV1 or any other ruthenium red-sensitive ion channels are required for the PAR1-mediated inward current or membrane depolarization in isolated nodose neurons. Consistent with these findings, PAR1-mediated action potential discharge in mouse lung nodose C-fiber terminals was unaltered in Trpa1/Trpv1 double-knockout animals and Trpc3/Trpc6 double-knockout animals. The activation of the C-fibers was also not inhibited by ruthenium red at concentrations that blocked TRPV1- and TRPA1-dependent responses. The biophysical data show that PAR1/Gq-mediated activation of nodose C-fibers may involve multiple ion channels downstream from PLCβ3 activation. TRPA1 is an ion channel that participates in PAR1/Gq-mediated elevation in intracellular calcium. There is little evidence, however, that TRPA1, TRPV1, TRPC3, TRPC6, or other ruthenium red-sensitive TRP channels are required for PAR1/Gq-PLCβ3-mediated membrane depolarization and action potential discharge in bronchopulmonary nodose C-fibers in the mouse.
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Affiliation(s)
- Hui Sun
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Sonya Meeker
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Bradley J Undem
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
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20
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Jurcakova D, Ru F, Undem BJ. Allergen-induced histaminergic and non-histaminergic activation of itch C-fiber nerve terminals in mouse skin. Neuroscience 2019; 410:55-58. [PMID: 31047975 DOI: 10.1016/j.neuroscience.2019.04.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 03/29/2019] [Accepted: 04/22/2019] [Indexed: 11/16/2022]
Abstract
Acute cutaneous exposure to allergen often leads to itch, but seldom pain. The effect of mast cell activation on cutaneous C-fibers was studied using innervated isolated mouse skin preparation that allows for intra-arterial delivery of chemicals to the nerve terminals in the skin. Allergen (ovalbumin) injection into the isolated skin of actively sensitized mice strongly stimulated chloroquine (CQ)-sensitive C-fibers (also referred to as "itch" nerves); on the other hand, CQ-insensitive C-fibers were activated only modestly, if at all. The histamine H1 receptor antagonist pyrilamine abolished itch C-fibers response to histamine, but failed to significantly reduce the response to ovalbumin. Ovalbumin also strongly activated itch C-fibers in skin isolated from Mrgpr-cluster Δ-/- mice. When pyrilamine was studied in the Mrgpr-cluster Δ-/- mice thereby eliminating the influence of both histamine H1 and Mrgpr receptors (MrgprA3 and C11 are selectively expressed by itch nerves), the ovalbumin response was very nearly eliminated. The data indicate that the acute activation of itch C-fibers in mouse skin is largely secondary to the combined effect of activation of histamine H1 and Mrpgr receptors.
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Affiliation(s)
- Danica Jurcakova
- Johns Hopkins School of Medicine, Baltimore, MD, USA; Department of Pathophysiology, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia
| | - Fei Ru
- Johns Hopkins School of Medicine, Baltimore, MD, USA.
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21
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Kollarik M, Sun H, Herbstsomer RA, Ru F, Kocmalova M, Meeker SN, Undem BJ. Different role of TTX-sensitive voltage-gated sodium channel (Na V 1) subtypes in action potential initiation and conduction in vagal airway nociceptors. J Physiol 2019; 596:1419-1432. [PMID: 29435993 DOI: 10.1113/jp275698] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 01/23/2018] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS The action potential initiation in the nerve terminals and its subsequent conduction along the axons of afferent nerves are not necessarily dependent on the same voltage-gated sodium channel (NaV 1) subunits. The action potential initiation in jugular C-fibres within airway tissues is not blocked by TTX; nonetheless, conduction of action potentials along the vagal axons of these nerves is often dependent on TTX-sensitive channels. This is not the case for nodose airway Aδ-fibres and C-fibres, where both action potential initiation and conduction is abolished by TTX or selective NaV 1.7 blockers. The difference between the initiation of action potentials within the airways vs. conduction along the axons should be considered when developing NaV 1 blocking drugs for topical application to the respiratory tract. ABSTRACT The action potential (AP) initiation in the nerve terminals and its subsequent AP conduction along the axons do not necessarily depend on the same subtypes of voltage-gated sodium channels (NaV 1s). We evaluated the role of TTX-sensitive and TTX-resistant NaV 1s in vagal afferent nociceptor nerves derived from jugular and nodose ganglia innervating the respiratory system. Single cell RT-PCR was performed on vagal afferent neurons retrogradely labelled from the guinea pig trachea. Almost all of the jugular neurons expressed the TTX-sensitive channel NaV 1.7 along with TTX-resistant NaV 1.8 and NaV 1.9. Tracheal nodose neurons also expressed NaV 1.7 but, less frequently, NaV 1.8 and NaV 1.9. NaV 1.6 were expressed in ∼40% of the jugular and 25% of nodose tracheal neurons. Other NaV 1 α subunits were only rarely expressed. Single fibre recordings were made from the vagal nodose and jugular nerve fibres innervating the trachea or lung in the isolated perfused vagally-innervated preparations that allowed for selective drug delivery to the nerve terminal compartment (AP initiation) or to the desheathed vagus nerve (AP conduction). AP initiation in jugular C-fibres was unaffected by TTX, although it was inhibited by NaV 1.8 blocker (PF-01247324) and abolished by combination of TTX and PF-01247324. However, AP conduction in the majority of jugular C-fibres was abolished by TTX. By contrast, both AP initiation and conduction in nodose nociceptors was abolished by TTX or selective NaV 1.7 blockers. Distinction between the effect of a drug with respect to inhibiting AP in the nerve terminals within the airways vs. at conduction sites along the vagus nerve is relevant to therapeutic strategies involving inhaled NaV 1 blocking drugs.
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Affiliation(s)
- M Kollarik
- Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Department of Pathophysiology, Biomedical Center Martin, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia
| | - H Sun
- Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - R A Herbstsomer
- Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - F Ru
- Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - M Kocmalova
- Department of Pharmacology, Biomedical Center Martin, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia
| | - S N Meeker
- Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - B J Undem
- Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
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22
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Huang Y, Patil MJ, Yu M, Liptak P, Undem BJ, Dong X, Wang G, Yu S. Effects of ginger constituent 6-shogaol on gastroesophageal vagal afferent C-fibers. Neurogastroenterol Motil 2019; 31:e13585. [PMID: 30947399 PMCID: PMC6522279 DOI: 10.1111/nmo.13585] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 02/22/2019] [Accepted: 03/05/2019] [Indexed: 02/08/2023]
Abstract
BACKGROUND Ginger has been used as an herbal medicine worldwide to relieve nausea/vomiting and gastrointestinal discomfort, but the cellular and molecular mechanisms of its neuronal action remain unclear. The present study aimed to determine the effects of ginger constituent 6-shogaol on gastroesophageal vagal nodose C-fibers. METHODS Extracellular single-unit recording and two-photon nodose neuron imaging were performed, respectively, in ex vivo gastroesophageal-vagal preparations from wild type and Pirt-GCaMP6 transgenic mice. The action potential discharge or calcium influx evoked by mechanical distension and chemical perfusions applied to the gastroesophageal vagal afferent nerve endings were recorded, respectively, at their intact neuronal cell soma in vagal nodose ganglia. The effects of 6-shogaol on nodose C-fiber neurons were then compared and determined. KEY RESULTS Gastroesophageal application of 6-shogaol-elicited intensive calcium influxes in nodose neurons and evoked robust action potential discharges in most studied nodose C-fibers. Such activation effects were followed by a desensitized response to the second application of 6-shogaol. However, action potential discharges evoked by esophageal mechanical distension, after 6-shogaol perfusion, did not significantly change. Pretreatment with TRPA1 selective blocker HC-030031 inhibited 6-shogaol-induced action potential discharges in gastric and esophageal nodose C-fiber neurons, suggesting that TRPA1 played a role in mediating 6-shogaol-induced activation response. CONCLUSION AND INFERENCES This study provides evidence that ginger constituent 6-shogaol directly activates vagal afferent C-fiber peripheral gastrointestinal endings. This activation leads to desensitization to subsequent application of 6-shogaol but not subsequent esophageal mechanical distension. Further investigation is required to establish a possible contribution in its anti-emetic effects.
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Affiliation(s)
- Yongming Huang
- Department of Medicine, Johns Hopkins University School of Medicine, USA,Department of Gastrointestinal Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Mayur J. Patil
- Department of Medicine, Johns Hopkins University School of Medicine, USA
| | - Mingwei Yu
- Department of Medicine, Johns Hopkins University School of Medicine, USA
| | - Peter Liptak
- Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Slovakia
| | - Bradley J. Undem
- Department of Medicine, Johns Hopkins University School of Medicine, USA
| | - Xinzhong Dong
- Department of Neuroscience, Solomon H. Snyder Johns Hopkins University School of Medicine, USA
| | - Guobin Wang
- Department of Gastrointestinal Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Shaoyong Yu
- Department of Medicine, Johns Hopkins University School of Medicine, USA,Corresponding: Shaoyong Yu, MD, MPH., Johns Hopkins University School of Medicine, Ross Research Building, Room 945, 720 Rutland Ave, Baltimore 21205, Phone: (410) 502-2455,
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23
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Sun H, Patil M, Ru F, Meeker S, Undem BJ. Potassium Channel Subtypes that Regulate Airway Vagal Sensory Nerve Excitability. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.556.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hui Sun
- Johns Hopkins UniversityBaltimoreMD
| | | | - Fei Ru
- Johns Hopkins UniversityBaltimoreMD
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Patil MJ, Sun H, Ru F, Meeker S, Undem BJ. Targeting C-fibers for peripheral acting anti-tussive drugs. Pulm Pharmacol Ther 2019; 56:15-19. [PMID: 30872160 DOI: 10.1016/j.pupt.2019.03.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 03/01/2019] [Accepted: 03/06/2019] [Indexed: 01/09/2023]
Abstract
Activation of vagal C-fibers is likely involved in some types of pathological coughing, especially coughing that is associated with airway inflammation. This is because stimulation of vagal C-fibers leads to strong urge to cough sensations, and because C-fiber terminals can be strongly activated by mediators associated with airway inflammation. The most direct manner in which a given mediator can activate a C-fiber terminal is through interacting with its receptor expressed in the terminal membrane. The agonist-receptor interaction then must lead to the opening (or potentially closing) of ion channels that lead to a membrane depolarization. This depolarization is referred to as a generator potential. If, and only if, the generator potential reaches the voltage necessary to activate voltage-gated sodium channels, action potentials are initiated and conducted to the central terminals within the CNS. Therefore, there are three target areas to block the inflammatory mediator induced activation of C-fiber terminals. First, at the level of the mediator-receptor interaction, secondly at the level of the generator potential, and third at the level of the voltage-gated sodium channels. Here we provide a brief overview of each of these therapeutic strategies.
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Affiliation(s)
- Mayur J Patil
- Department of Medicine, Johns Hopkins University School of Medicine, USA
| | - Hui Sun
- Department of Medicine, Johns Hopkins University School of Medicine, USA
| | - Fei Ru
- Department of Medicine, Johns Hopkins University School of Medicine, USA
| | - Sonya Meeker
- Department of Medicine, Johns Hopkins University School of Medicine, USA
| | - Bradley J Undem
- Department of Medicine, Johns Hopkins University School of Medicine, USA.
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25
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Sun H, Lin AH, Ru F, Patil MJ, Meeker S, Lee LY, Undem BJ. KCNQ/M-channels regulate mouse vagal bronchopulmonary C-fiber excitability and cough sensitivity. JCI Insight 2019; 4:124467. [PMID: 30721152 DOI: 10.1172/jci.insight.124467] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 01/29/2019] [Indexed: 01/06/2023] Open
Abstract
Increased airway vagal sensory C-fiber activity contributes to the symptoms of inflammatory airway diseases. The KCNQ/Kv7/M-channel is a well-known determinant of neuronal excitability, yet whether it regulates the activity of vagal bronchopulmonary C-fibers and airway reflex sensitivity remains unknown. Here we addressed this issue using single-cell RT-PCR, patch clamp technique, extracellular recording of single vagal nerve fibers innervating the mouse lungs, and telemetric recording of cough in free-moving mice. Single-cell mRNA analysis and biophysical properties of M-current (IM) suggest that KCNQ3/Kv7.3 is the major M-channel subunit in mouse nodose neurons. The M-channel opener retigabine negatively shifted the voltage-dependent activation of IM, leading to membrane hyperpolarization, increased rheobase, and suppression of both evoked and spontaneous action potential (AP) firing in nodose neurons in an M-channel inhibitor XE991-sensitive manner. Retigabine also markedly suppressed the α,β-methylene ATP-induced AP firing in nodose C-fiber terminals innervating the mouse lungs, and coughing evoked by irritant gases in awake mice. In conclusion, KCNQ/M-channels play a role in regulating the excitability of vagal airway C-fibers at both the cell soma and nerve terminals. Drugs that open M-channels in airway sensory afferents may relieve the sufferings associated with pulmonary inflammatory diseases such as chronic coughing.
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Affiliation(s)
- Hui Sun
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - An-Hsuan Lin
- Department of Physiology, University of Kentucky, Lexington, Kentucky, USA
| | - Fei Ru
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Mayur J Patil
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Sonya Meeker
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Lu-Yuan Lee
- Department of Physiology, University of Kentucky, Lexington, Kentucky, USA
| | - Bradley J Undem
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Patil MJ, Meeker S, Bautista D, Dong X, Undem BJ. Sphingosine-1-phosphate activates mouse vagal airway afferent C-fibres via S1PR3 receptors. J Physiol 2019; 597:2007-2019. [PMID: 30793318 DOI: 10.1113/jp277521] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 01/14/2019] [Indexed: 01/08/2023] Open
Abstract
KEY POINTS Sphingosine-1-phosphate (S1P) strongly activates mouse vagal C-fibres in the airways. Airway-specific nodose and jugular C-fibre neurons express mRNA coding for the S1P receptor S1PR3. S1P activation of nodose C-fibres is inhibited by a S1PR3 antagonist. S1P activation of nodose C-fibres does not occur in S1PR3 knockout mice. ABSTRACT We evaluated the effect of sphingosine-1-phosphate (S1P), a lipid that is elevated during airway inflammatory conditions like asthma, for its ability to stimulate vagal afferent C-fibres in mouse lungs. Single cell RT-PCR on lung-specific vagal afferent neurons revealed that both TRPV1-expressing and TRPV1-non-expressing nodose neurons express mRNA coding for the S1P receptor S1PR3. TRPV1-expressing airway-specific jugular ganglion neurons also express S1PR3 mRNA. S1PR1 and S1PR2 mRNAs were also found to be expressed but only in a limited subset (32% and 22%, respectively) of airway-specific vagal sensory neurons; whereas S1PR4 and S1PR5 were rarely expressed. We used large scale two-photon imaging of the nodose ganglia from our ex vivo preparation isolated from Pirt-Cre;R26-GCaMP6s transgenic mice, which allows for simultaneous monitoring of calcium transients in ∼1000 neuronal cell bodies in the ganglia during tracheal perfusion with S1P (10 μM). We found that S1P in the lungs strongly activated 81.5% of nodose fibres, 70% of which were also activated by capsaicin. Single fibre electrophysiological recordings confirmed that S1P evoked action potential (AP) generation in a concentration-dependent manner (0.1-10 μM). Action potential generation by S1P in nodose C-fibres was effectively inhibited by the S1PR3 antagonist TY 52156 (10 μM). Finally, in S1PR3 knockout mice, S1P was not able to activate any of the airway nodose C-fibres analysed. These results support the hypothesis that S1P may play a role in evoking C-fibre-mediated airway sensations and reflexes that are associated with airway inflammatory diseases.
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Affiliation(s)
- Mayur J Patil
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Sonya Meeker
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Diana Bautista
- Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA
| | - Xinzhong Dong
- Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Bradley J Undem
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Yu X, Patil MJ, Yu M, Liu Y, Wang J, Undem BJ, Yu S. Sphingosine-1-phosphate selectively activates vagal afferent C-fiber subtype in guinea pig esophagus. Neurogastroenterol Motil 2018; 30:e13359. [PMID: 29673037 DOI: 10.1111/nmo.13359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 03/25/2018] [Indexed: 02/08/2023]
Abstract
BACKGROUND Activation and sensitization of visceral afferent nerves by inflammatory mediators play important roles in visceral nociception. Sphingosine-1-phosphate (S1P) is a lipid with intracellular and extracellular functions. Extracellularly, it can act as an autacoid via interactions with S1P receptors. The present study aims to determine the effect of S1P on esophageal vagal afferent nerve functions. METHODS Extracellular single-unit recordings were performed in ex vivo guinea pig esophageal-vagal preparations. The action potentials (APs) evoked by mechanical distension and chemical perfusions applied to the vagal afferent nerve endings in the esophagus were recorded at their intact neuronal cell bodies in either nodose or jugular ganglia. The effects of S1P and its receptor subtype agonists on vagal afferents were recorded and compared. The expression of S1P receptors (S1PR1-3) in esophageal-labeled vagal nodose and jugular neurons was studied by single-cell RT-PCR. KEY RESULTS Sphingosine-1-phosphate evoked AP discharges in almost all esophageal jugular but not nodose C-fibers without changing their responses to esophageal distension. Esophageal-labeled vagal nodose and jugular neurons highly expressed transcripts of S1PR1 and S1PR3. Agonists of S1PR1 and S1PR3 each partially mimicked S1P-induced effect in jugular C-fibers, suggesting that these receptors may contribute partially to S1P-induced activation effect on esophageal jugular C-fiber subtype. CONCLUSIONS & INFERENCES These data, for the first time, demonstrated a selective activation effect of S1P on vagal afferent nerve subtype in the gastrointestinal tract. This may help to better understand its role in visceral inflammatory nociception.
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Affiliation(s)
- X Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - M J Patil
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - M Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Y Liu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - J Wang
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI, USA
| | - B J Undem
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - S Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Jurcakova D, Ru F, Kollarik M, Sun H, Krajewski J, Undem BJ. Voltage-Gated Sodium Channels Regulating Action Potential Generation in Itch-, Nociceptive-, and Low-Threshold Mechanosensitive Cutaneous C-Fibers. Mol Pharmacol 2018; 94:1047-1056. [DOI: 10.1124/mol.118.112839] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 06/20/2018] [Indexed: 01/25/2023] Open
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Han L, Limjunyawong N, Ru F, Li Z, Hall OJ, Steele H, Zhu Y, Wilson J, Mitzner W, Kollarik M, Undem BJ, Canning BJ, Dong X. Mrgprs on vagal sensory neurons contribute to bronchoconstriction and airway hyper-responsiveness. Nat Neurosci 2018; 21:324-328. [PMID: 29403029 PMCID: PMC5857222 DOI: 10.1038/s41593-018-0074-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Accepted: 12/04/2017] [Indexed: 01/28/2023]
Abstract
Asthma, accompanied by lung inflammation, bronchoconstriction and airway hyper-responsiveness, is a significant public health burden. Here we report that Mas-related G protein-coupled receptors (Mrgprs) are expressed in a subset of vagal sensory neurons innervating the airway and mediates cholinergic bronchoconstriction and airway hyper-responsiveness. These findings provide insights into the neural mechanisms underlying the pathogenesis of asthma.
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Affiliation(s)
- Liang Han
- The Solomon H. Snyder Department of Neuroscience, Center for Sensory Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA.
| | - Nathachit Limjunyawong
- The Solomon H. Snyder Department of Neuroscience, Center for Sensory Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Fei Ru
- Department of Medicine, Division of Allergy and Clinical Immunology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Zhe Li
- The Solomon H. Snyder Department of Neuroscience, Center for Sensory Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Olivia J Hall
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA
| | - Haley Steele
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Yuyan Zhu
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Julie Wilson
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Wayne Mitzner
- Department of Environmental Health Sciences, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA
| | - Marian Kollarik
- Department of Medicine, Division of Allergy and Clinical Immunology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Bradley J Undem
- Department of Medicine, Division of Allergy and Clinical Immunology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Brendan J Canning
- Department of Medicine, Division of Allergy and Clinical Immunology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Xinzhong Dong
- The Solomon H. Snyder Department of Neuroscience, Center for Sensory Biology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
- Howard Hughes Medical Institute, Johns Hopkins University, Baltimore, MD, USA.
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Abstract
Vagal sensory neurons constitute the major afferent supply to the airways and lungs. Subsets of afferents are defined by their embryological origin, molecular profile, neurochemistry, functionality, and anatomical organization, and collectively these nerves are essential for the regulation of respiratory physiology and pulmonary defense through local responses and centrally mediated neural pathways. Mechanical and chemical activation of airway afferents depends on a myriad of ionic and receptor-mediated signaling, much of which has yet to be fully explored. Alterations in the sensitivity and neurochemical phenotype of vagal afferent nerves and/or the neural pathways that they innervate occur in a wide variety of pulmonary diseases, and as such, understanding the mechanisms of vagal sensory function and dysfunction may reveal novel therapeutic targets. In this comprehensive review we discuss historical and state-of-the-art concepts in airway sensory neurobiology and explore mechanisms underlying how vagal sensory pathways become dysfunctional in pathological conditions.
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Affiliation(s)
- Stuart B Mazzone
- School of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, Australia; and Department of Medicine, Johns Hopkins University Medical School, Asthma & Allergy Center, Baltimore, Maryland
| | - Bradley J Undem
- School of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, Australia; and Department of Medicine, Johns Hopkins University Medical School, Asthma & Allergy Center, Baltimore, Maryland
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Ru F, Sun H, Jurcakova D, Herbstsomer RA, Meixong J, Dong X, Undem BJ. Mechanisms of pruritogen-induced activation of itch nerves in isolated mouse skin. J Physiol 2017; 595:3651-3666. [PMID: 28217875 DOI: 10.1113/jp273795] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Accepted: 02/07/2017] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Chloroquine (CQ) stimulates itch nerves and causes intense scratching in mice by activating the G-protein coupled receptor (GPCR) MrgprA3; it is not known how stimulation of MrgprA3 (or other GPCRs) leads to activation of the itch nerve terminals in the skin, but previous studies have found that transient receptor potential A1 (TRPA1) gene deletion blocks CQ-induced scratching. In the present study we used a novel dorsal skin-nerve preparation to evaluate mechanisms underlying CQ- and histamine-induced action potential discharge in itch nerve terminals. We found that CQ activation of the nerves requires the beta3 isoform of phospholipase C, but TRPA1 or other TRP channel are not required. Evidence is provided for a role for calcium-activated chloride channels such as TMEM16a in GPCR-activation of itch nerve terminals. The mechanism by which TRP channels participate in pruritogen-induced scratching may involve sites of action other than the primary afferent terminals. ABSTRACT Chloroquine (CQ) and histamine are pruritogens commonly used to study itch in the mouse. A novel skin-nerve preparation was used to evaluate chloroquine (CQ)- and histamine-induced activation of afferent nerves in the dorsal thoracic skin of the mouse. All CQ sensitive nerves were C-fibres, and were also sensitive to histamine. The response to CQ, but not histamine, was largely absent in mrgpr-cluster Δ-/- mice, supporting the hypothesis that CQ evokes itch largely via stimulation of MrgprA3 receptors. The CQ-induced action potential discharge was largely absent in phospholipase Cβ3 knockout animals. The CQ and histamine responses were not influenced by removal of TRPA1, TRPV1, TRPC3 or TRPC6, nor by the TRP channel blocker Ruthenium Red. The bouts of scratching in response to CQ were not different between wild-type and TRPA1-deficient mice. A selective inhibitor of the calcium-activated chloride channel TMEM16A, N-((4-methoxy)-2-naphthyl)-5-nitroanthranilic acid (MONNA), inhibited CQ-induced action potential discharge at itch nerve terminals and bouts of scratching by about 50%. Although TRPA1 and TRPV1 channels may be involved in the scratching responses to intradermal pruritogens, this is unlikely to be due to an effect at the nerve terminals, where chloride channels may play a more important role.
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Affiliation(s)
- F Ru
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - H Sun
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - D Jurcakova
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Department of Pathophysiology, Biomedical Centre Martin, Jessenius Medical School, Comenius University, Martin, Slovakia
| | - R A Herbstsomer
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - J Meixong
- Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - X Dong
- Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - B J Undem
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Zhao Y, Luo X, Qiu L, Do DC, Ke X, Zaccone E, Undem BJ, Gao P. Aryl hydrocarbon receptor in airway epithelium exacerbates cockroach allergen-induced asthma through autophagy. J Allergy Clin Immunol 2017. [DOI: 10.1016/j.jaci.2016.12.863] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kocmalova M, Kollarik M, Canning BJ, Ru F, Adam Herbstsomer R, Meeker S, Fonquerna S, Aparici M, Miralpeix M, Chi XX, Li B, Wilenkin B, McDermott J, Nisenbaum E, Krajewski JL, Undem BJ. Control of Neurotransmission by NaV1.7 in Human, Guinea Pig, and Mouse Airway Parasympathetic Nerves. J Pharmacol Exp Ther 2017; 361:172-180. [PMID: 28138042 DOI: 10.1124/jpet.116.238469] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 01/26/2017] [Indexed: 12/19/2022] Open
Abstract
Little is known about the neuronal voltage-gated sodium channels (NaVs) that control neurotransmission in the parasympathetic nervous system. We evaluated the expression of the α subunits of each of the nine NaVs in human, guinea pig, and mouse airway parasympathetic ganglia. We combined this information with a pharmacological analysis of selective NaV blockers on parasympathetic contractions of isolated airway smooth muscle. As would be expected from previous studies, tetrodotoxin potently blocked the parasympathetic responses in the airways of each species. Gene expression analysis showed that that NaV 1.7 was virtually the only tetrodotoxin-sensitive NaV1 gene expressed in guinea pig and human airway parasympathetic ganglia, where mouse ganglia expressed NaV1.1, 1.3, and 1.7. Using selective pharmacological blockers supported the gene expression results, showing that blocking NaV1.7 alone can abolish the responses in guinea pig and human bronchi, but not in mouse airways. To block the responses in mouse airways requires that NaV1.7 along with NaV1.1 and/or NaV1.3 is blocked. These results may suggest novel indications for NaV1.7-blocking drugs, in which there is an overactive parasympathetic drive, such as in asthma. The data also raise the potential concern of antiparasympathetic side effects for systemic NaV1.7 blockers.
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Affiliation(s)
- Michaela Kocmalova
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Marian Kollarik
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Brendan J Canning
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Fei Ru
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - R Adam Herbstsomer
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Sonya Meeker
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Silvia Fonquerna
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Monica Aparici
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Montserrat Miralpeix
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Xian Xuan Chi
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Baolin Li
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Ben Wilenkin
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Jeff McDermott
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Eric Nisenbaum
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Jeffrey L Krajewski
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
| | - Bradley J Undem
- The Johns Hopkins University School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland 21224 (M.Koc., M.Kol., B.J.C., F.R., R.A.H., S.M., B.J.U.); Biomedical Center Martin, Pharmacology and Pathophysiology, Jessenius Faculty of Medicine, Comenius University, Martin 03601, Slovakia (M.Koc., M.Kol.); Almirall S.A., R&D Research Center, Barcelona 08980, Spain (S.F., M.A., M.M.); and Lilly Research Laboratories, Indianapolis, Indiana 46285 (X.C., B.L., B.W., J.M., E.N., J.L.K.)
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Zaccone EJ, Lieu T, Muroi Y, Potenzieri C, Undem BE, Gao P, Han L, Canning BJ, Undem BJ. Parainfluenza 3-Induced Cough Hypersensitivity in the Guinea Pig Airways. PLoS One 2016; 11:e0155526. [PMID: 27213574 PMCID: PMC4877001 DOI: 10.1371/journal.pone.0155526] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 04/29/2016] [Indexed: 02/06/2023] Open
Abstract
The effect of respiratory tract viral infection on evoked cough in guinea pigs was evaluated. Guinea pigs were inoculated intranasally with either parainfluenza type 3 (PIV3) and cough was quantified in conscious animals. The guinea pigs infected with PIV3 (day 4) coughed nearly three times more than those treated with the viral growth medium in response to capsaicin, citric acid, and bradykinin. Since capsaicin, citric acid, and bradykinin evoked coughing in guinea pigs can be inhibited by drugs that antagonize the transient receptor potential cation channel, subfamily V, member 1 (TRPV1), it was reasoned that the virally-induced hypertussive state may involve alterations in TPRV1 activity. PIV3 infection caused a phenotypic switch in tracheal nodose Aδ “cough receptors” such that nearly 50% of neurons began to express, de novo, TRPV1 mRNA. There was also an increase TRPV1 expression in jugular C-fiber neurons as determined by qPCR. It has previously been reported that tracheal-specific nodose neurons express the BDNF receptor TrkB and jugular neurons express the NGF receptor TrkA. Jugular neurons also express the artemin receptor GFRα3. All these neurotrophic factors have been associated with increases in TRPV1 expression. In an ex vivo perfused guinea pig tracheal preparation, we demonstrated that within 8 h of PIV3 infusion there was no change in NGF mRNA expression, but there was nearly a 10-fold increase in BDNF mRNA in the tissue, and a small but significant elevation in the expression of artemin mRNA. In summary, PIV3 infection leads to elevations in TRPV1 expression in the two key cough evoking nerve subtypes in the guinea pig trachea, and this is associated with a hypertussive state with respect to various TRPV1 activating stimuli.
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Affiliation(s)
- Eric J. Zaccone
- Department of Medicine, Division of Allergy and Clinical Immunology, Johns Hopkins University, School of Medicine, Baltimore, Maryland, United States of America
| | - TinaMarie Lieu
- Department of Medicine, Division of Allergy and Clinical Immunology, Johns Hopkins University, School of Medicine, Baltimore, Maryland, United States of America
| | - Yukiko Muroi
- Department of Medicine, Division of Allergy and Clinical Immunology, Johns Hopkins University, School of Medicine, Baltimore, Maryland, United States of America
| | - Carl Potenzieri
- Department of Medicine, Division of Allergy and Clinical Immunology, Johns Hopkins University, School of Medicine, Baltimore, Maryland, United States of America
| | - Blair E. Undem
- Department of Medicine, Division of Allergy and Clinical Immunology, Johns Hopkins University, School of Medicine, Baltimore, Maryland, United States of America
| | - Peisong Gao
- Department of Medicine, Division of Allergy and Clinical Immunology, Johns Hopkins University, School of Medicine, Baltimore, Maryland, United States of America
| | - Liang Han
- The Solomon H. Snyder Department of Neuroscience, Center of Sensory Biology, the Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Brendan J. Canning
- Department of Medicine, Division of Allergy and Clinical Immunology, Johns Hopkins University, School of Medicine, Baltimore, Maryland, United States of America
| | - Bradley J. Undem
- Department of Medicine, Division of Allergy and Clinical Immunology, Johns Hopkins University, School of Medicine, Baltimore, Maryland, United States of America
- * E-mail:
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Undem BJ, Zaccone E, McGarvey L, Mazzone SB. Neural dysfunction following respiratory viral infection as a cause of chronic cough hypersensitivity. Pulm Pharmacol Ther 2015; 33:52-6. [PMID: 26141017 DOI: 10.1016/j.pupt.2015.06.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 06/16/2015] [Accepted: 06/26/2015] [Indexed: 02/03/2023]
Abstract
Respiratory viral infections are a common cause of acute coughing, an irritating symptom for the patient and an important mechanism of transmission for the virus. Although poorly described, the inflammatory consequences of infection likely induce coughing by chemical (inflammatory mediator) or mechanical (mucous) activation of the cough-evoking sensory nerves that innervate the airway wall. For some individuals, acute cough can evolve into a chronic condition, in which cough and aberrant airway sensations long outlast the initial viral infection. This suggests that some viruses have the capacity to induce persistent plasticity in the neural pathways mediating cough. In this brief review we present the clinical evidence of acute and chronic neural dysfunction following viral respiratory tract infections and explore possible mechanisms by which the nervous system may undergo activation, sensitization and plasticity.
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Affiliation(s)
- Bradley J Undem
- Department of Medicine, Johns Hopkins Asthma and Allergy Center, 5501 Hopkins Bayview Circle, Baltimore, MD, 21224, USA.
| | - Eric Zaccone
- Department of Medicine, Johns Hopkins Asthma and Allergy Center, 5501 Hopkins Bayview Circle, Baltimore, MD, 21224, USA
| | - Lorcan McGarvey
- Centre of Infection and Immunity, The Queen's University of Belfast, Belfast, Northern Ireland, BT12 6BJ, UK.
| | - Stuart B Mazzone
- School of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia.
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Abstract
A great deal of basic and applied physiology and pharmacology in sensory and autonomic neuroscience has teased apart mechanisms that drive normal perception of mechanical, thermal and chemical signals and convey them to CNS, the distinction of fiber types and receptors and channels that mediate them, and how they may become dysfunctional or maladaptive in disease. Likewise, regulation of efferent autonomic traffic to control organ reflexes has been well studied. In both afferent and efferent limbs, a wide array of potential therapeutic mechanisms has surfaced, some of which have progressed into clinic, if not full regrastration. One conversation that has been less well progressed relates to how the afferent limb and its sensitization shapes the efferent outputs, and where modulation may offer new therapeutic avenues, especially for poorly addressed and common signs and symptoms of disease. Therapeutics for CV disease (HF, hypertension), respiratory disease (asthma, COPD), urological disease (OAB), GI disease (IBS), and inter alia, have largely focused on the efferent control of effector cells to modulate movement, contraction and secretion; medicinal needs remain with limits to efficacy, AEs and treatment resistance being common. We now must turn, in the quest for improved therapeutics, to understand how sensation from these organs becomes maladapted and sensitized in disease, and what opportunities may arise for improved therapeutics given the abundance of targets, many pharmacologically untapped, on the afferent side. One might look at the treatment resistant hypertension and the emerging benefit of renal denervation; or urinary bladder overactivity / neurogenic bladder and the emergence of neuromodulation, capsaicin instillation or botox injections to attenuate sensitized reflexes, as examples of merely the start of such progress. This review examines this topic more deeply, as applies to four major organ systems all sharing a great need from unsatisfied patients.
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Affiliation(s)
| | - Bradley J Undem
- Johns Hopkins School of Medicine, Division of Allergy and Clinical Immunology, Baltimore, MD 21224, USA
| | - Lori A Birder
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburg, PA 15261, USA
| | - David Grundy
- Department of Biomedical Science, The University of Sheffield, Sheffield S10 2TN, UK
| | - Wioletta Pijacka
- School of Physiology & Pharmacology, Bristol CardioVascular, University of Bristol, Bristol, BS8 1TD, UK
| | - Julian F R Paton
- School of Physiology & Pharmacology, Bristol CardioVascular, University of Bristol, Bristol, BS8 1TD, UK
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McAlexander MA, Gavett SH, Kollarik M, Undem BJ. Vagotomy reverses established allergen-induced airway hyperreactivity to methacholine in the mouse. Respir Physiol Neurobiol 2015; 212-214:20-4. [PMID: 25842220 DOI: 10.1016/j.resp.2015.03.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 03/24/2015] [Accepted: 03/26/2015] [Indexed: 11/26/2022]
Abstract
We evaluated the role of vagal reflexes in a mouse model of allergen-induced airway hyperreactivity. Mice were actively sensitized to ovalbumin then exposed to the allergen via inhalation. Prior to ovalbumin inhalation, mice also received intratracheally-instilled particulate matter in order to boost the allergic response. In control mice, methacholine (i.v.) caused a dose-dependent increase in respiratory tract resistance (RT) that only modestly decreased if the vagi were severed bilaterally just prior to the methacholine challenge. Sensitized and challenged mice, however, manifested an airway reactivity increase that was abolished by severing the vagi prior to methacholine challenge. In an innervated ex vivo mouse lung model, methacholine selectively evoked action potential discharge in a subset of distension-sensitive A-fibers. These data support the hypothesis that the major component of the increased airway reactivity in inflamed mice is due to a vagal reflex initiated by activation of afferent fibers, even in response to a direct (i.e., smooth muscle)-acting muscarinic agonist.
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Affiliation(s)
| | - Stephen H Gavett
- EPHD, NHEERL, United States Environmental Protection Agency, Research Triangle Park, NC, United States
| | - Marian Kollarik
- Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Bradley J Undem
- Johns Hopkins School of Medicine, Baltimore, MD, United States.
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Yu X, Hu Y, Ru F, Kollarik M, Undem BJ, Yu S. TRPM8 function and expression in vagal sensory neurons and afferent nerves innervating guinea pig esophagus. Am J Physiol Gastrointest Liver Physiol 2015; 308:G489-96. [PMID: 25591866 PMCID: PMC4360048 DOI: 10.1152/ajpgi.00336.2014] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Sensory transduction in esophageal afferents requires specific ion channels and receptors. TRPM8 is a new member of the transient receptor potential (TRP) channel family and participates in cold- and menthol-induced sensory transduction, but its role in visceral sensory transduction is still less clear. This study aims to determine TRPM8 function and expression in esophageal vagal afferent subtypes. TRPM8 agonist WS-12-induced responses were first determined in nodose and jugular neurons by calcium imaging and then investigated by whole cell patch-clamp recordings in Dil-labeled esophageal nodose and jugular neurons. Extracellular single-unit recordings were performed in nodose and jugular C fiber neurons using ex vivo esophageal-vagal preparations with intact nerve endings in the esophagus. TRPM8 mRNA expression was determined by single neuron RT-PCR in Dil-labeled esophageal nodose and jugular neurons. The TRPM8 agonist WS-12 elicited calcium influx in a subpopulation of jugular but not nodose neurons. WS-12 activated outwardly rectifying currents in esophageal Dil-labeled jugular but not nodose neurons in a dose-dependent manner, which could be inhibited by the TRPM8 inhibitor AMTB. WS-12 selectively evoked action potential discharges in esophageal jugular but not nodose C fibers. Consistently, TRPM8 transcripts were highly expressed in esophageal Dil-labeled TRPV1-positive jugular neurons. In summary, the present study demonstrated a preferential expression and function of TRPM8 in esophageal vagal jugular but not nodose neurons and C fiber subtypes. This provides a distinctive role of TRPM8 in esophageal sensory transduction and may lead to a better understanding of the mechanisms of esophageal sensation and nociception.
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Affiliation(s)
| | | | | | | | | | - Shaoyong Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
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McNeil BD, Pundir P, Meeker S, Han L, Undem BJ, Kulka M, Dong X. Identification of a mast-cell-specific receptor crucial for pseudo-allergic drug reactions. Nature 2014; 519:237-41. [PMID: 25517090 PMCID: PMC4359082 DOI: 10.1038/nature14022] [Citation(s) in RCA: 822] [Impact Index Per Article: 82.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Accepted: 10/28/2014] [Indexed: 12/11/2022]
Abstract
Mast cells are primary effectors in allergic reactions, and may have significant roles in diseases by secreting histamine and various inflammatory and immunomodulatory substances1,2. While classically they are activated by IgE antibodies, a unique property of mast cells is their antibody-independent responsiveness to a range of cationic substances, collectively called basic secretagogues, including inflammatory peptides and drugs associated with allergic-type reactions1,3. Roles for these substances in pathology have prompted a decades-long search for their receptor(s). Here we report that basic secretagogues activate mouse mast cells in vitro and in vivo through a single receptor, MrgprB2, the orthologue of the human G-protein coupled receptor (GPCR) MrgprX2. Secretagogue-induced histamine release, inflammation, and airway contraction are abolished in MrgprB2 null mutant mice. Further, we show that most classes of FDA-approved peptidergic drugs associated with allergic-type injection-site reactions also activate MrgprB2 and MrgprX2, and that injection-site inflammation is absent in mutant mice. Finally, we determine that MrgprB2 and MrgprX2 are targets of many small molecule drugs associated with systemic pseudo-allergic, or anaphylactoid, reactions; we show that drug-induced symptoms of anaphylactoid responses are significantly reduced in knockout mice, and we identify a common chemical motif in several of these molecules that may help predict side effects of other compounds. These discoveries introduce a mouse model to study mast cell activation by basic secretagogues and identify MrgprX2 as a potential therapeutic target to reduce a subset of drug-induced adverse effects.
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Affiliation(s)
- Benjamin D McNeil
- The Solomon H. Snyder Department of Neuroscience, Department of Neurosurgery, Center for Sensory Biology, Johns Hopkins University, School of Medicine, Baltimore, Maryland 21205, USA
| | - Priyanka Pundir
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
| | - Sonya Meeker
- Department of Medicine, Division of Allergy and Clinical Immunology, Johns Hopkins University, School of Medicine, Baltimore, Maryland 21205, USA
| | - Liang Han
- The Solomon H. Snyder Department of Neuroscience, Department of Neurosurgery, Center for Sensory Biology, Johns Hopkins University, School of Medicine, Baltimore, Maryland 21205, USA
| | - Bradley J Undem
- Department of Medicine, Division of Allergy and Clinical Immunology, Johns Hopkins University, School of Medicine, Baltimore, Maryland 21205, USA
| | - Marianna Kulka
- 1] Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta T6G 2E1, Canada [2] National Institute for Nanotechnology, National Research Council Canada, Edmonton, Alberta T6G 2M9, Canada
| | - Xinzhong Dong
- 1] The Solomon H. Snyder Department of Neuroscience, Department of Neurosurgery, Center for Sensory Biology, Johns Hopkins University, School of Medicine, Baltimore, Maryland 21205, USA [2] Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
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Hu Y, Liu Z, Yu X, Pasricha PJ, Undem BJ, Yu S. Increased acid responsiveness in vagal sensory neurons in a guinea pig model of eosinophilic esophagitis. Am J Physiol Gastrointest Liver Physiol 2014; 307:G149-57. [PMID: 24875100 PMCID: PMC4101676 DOI: 10.1152/ajpgi.00097.2014] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Accepted: 05/16/2014] [Indexed: 01/31/2023]
Abstract
Eosinophilic esophagitis (EoE) is characterized with eosinophils and mast cells predominated allergic inflammation in the esophagus and present with esophageal dysfunctions such as dysphagia, food impaction, and heartburn. However, the underlying mechanism of esophageal dysfunctions is unclear. This study aims to determine whether neurons in the vagal sensory ganglia are modulated in a guinea pig model of EoE. Animals were actively sensitized by ovalbumin (OVA) and then challenged with aerosol OVA inhalation for 2 wk. This results in a mild esophagitis with increases in mast cells and eosinophils in the esophageal wall. Vagal nodose and jugular neurons were disassociated, and their responses to acid, capsaicin, and transient receptor potential vanilloid type 1 (TRPV1) antagonist AMG-9810 were studied by calcium imaging and whole cell patch-clamp recording. Compared with naïve animals, antigen challenge significantly increased acid responsiveness in both nodose and jugular neurons. Their responses to capsaicin were also increased after antigen challenge. AMG-9810, at a concentration that blocked capsaicin-evoked calcium influx, abolished the increase in acid-induced activation in both nodose and jugular neurons. Vagotomy strongly attenuated those increased responses of nodose and jugular neurons to both acid and capsaicin induced by antigen challenge. These data for the first time demonstrated that prolonged antigen challenge significantly increases acid responsiveness in vagal nodose and jugular ganglia neurons. This sensitization effect is mediated largely through TRPV1 and initiated at sensory nerve endings in the peripheral tissues. Allergen-induced enhancement of responsiveness to noxious stimulation by acid in sensory nerve may contribute to the development of esophageal dysfunctions such as heartburn in EoE.
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Affiliation(s)
- Youtian Hu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Zhenyu Liu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Xiaoyun Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Pankaj J Pasricha
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Bradley J Undem
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Shaoyong Yu
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
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McAlexander MA, Luttmann MA, Hunsberger GE, Undem BJ. Transient receptor potential vanilloid 4 activation constricts the human bronchus via the release of cysteinyl leukotrienes. J Pharmacol Exp Ther 2014; 349:118-25. [PMID: 24504097 DOI: 10.1124/jpet.113.210203] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Prior studies have demonstrated that the ion channel transient receptor potential vanilloid 4 (TRPV4) is functionally expressed in airway smooth muscle cells and that TRPV4 single nucleotide polymorphisms are associated with airflow obstruction in patients with chronic obstructive pulmonary disease. We sought to use isometric tension measurements in ex vivo airways to determine whether short-term pharmacological activation of TRPV4 with the potent agonist GSK1016790 [N-((1S)-1-{[4-((2S)-2-{[(2,4-dichlorophenyl)sulfonyl]amino}-3-hydroxypropanoyl)-1-piperazinyl]carbonyl}-3-methylbutyl)-1-benzothiophene-2-carboxamide] would constrict human bronchial tissue. As predicted, transient receptor potential vanilloid 4 activation in the human airway produces contractions that are blocked by the nonselective transient receptor potential channel blocker ruthenium red. Moreover, the novel TRPV4-selective blocker GSK2334775 [(R)-6-(methylsulfonyl)-3-((4-(pyrrolidin-1-yl)piperindin-1-yl)methyl)-N-(2,2,2,-trifluoro-1-phenylethyl)-2-(3-(trifluoromethyl)phenyl)quinoline-4-carboxamide] inhibited these contractions over a concentration range consistent with its in vitro potency against recombinant and native TRPV4-containing channels. Surprisingly, TRPV4-dependent contractions were also blocked by a 5-lipoxygenase inhibitor and two structurally distinct cysteinyl leukotriene 1 receptor antagonists. In aggregate, our results fail to support the hypothesis that TRPV4 in airway smooth muscle cells regulates airway contractility short term. Rather, we provide pharmacological evidence that TRPV4 activation causes human airway constriction that is entirely dependent upon the production of cysteinyl leukotrienes. Together, these data identify a novel mechanism by which TRPV4 activation may contribute to pathologic remodeling and inflammation, in addition to airflow obstruction, in the diseased human respiratory tract.
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Affiliation(s)
- M Allen McAlexander
- Respiratory Therapy Area, GlaxoSmithKline Pharmaceuticals, King of Prussia, Pennsylvania (M.A.M., M.A.L., G.E.H.); and Johns Hopkins Medical Institutions, Johns Hopkins University, Baltimore, Maryland (B.J.U.)
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Undem BJ, Taylor-Clark T. Mechanisms underlying the neuronal-based symptoms of allergy. J Allergy Clin Immunol 2014; 133:1521-34. [PMID: 24433703 DOI: 10.1016/j.jaci.2013.11.027] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 11/05/2013] [Accepted: 11/13/2013] [Indexed: 12/13/2022]
Abstract
Persons with allergies present with symptoms that often are the result of alterations in the nervous system. Neuronally based symptoms depend on the organ in which the allergic reaction occurs but can include red itchy eyes, sneezing, nasal congestion, rhinorrhea, coughing, bronchoconstriction, airway mucus secretion, dysphagia, altered gastrointestinal motility, and itchy swollen skin. These symptoms occur because mediators released during an allergic reaction can interact with sensory nerves, change processing in the central nervous system, and alter transmission in sympathetic, parasympathetic, and enteric autonomic nerves. In addition, evidence supports the idea that in some subjects this neuromodulation is, for reasons poorly understood, upregulated such that the same degree of nerve stimulus causes a larger effect than seen in healthy subjects. There are distinctions in the mechanisms and nerve types involved in allergen-induced neuromodulation among different organ systems, but general principles have emerged. The products of activated mast cells, other inflammatory cells, and resident cells can overtly stimulate nerve endings, cause long-lasting changes in neuronal excitability, increase synaptic efficacy, and also change gene expression in nerves, resulting in phenotypically altered neurons. A better understanding of these processes might lead to novel therapeutic strategies aimed at limiting the suffering of those with allergies.
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Affiliation(s)
- Bradley J Undem
- Division of Allergy & Clinical Immunology, Johns Hopkins School of Medicine, Baltimore, Md.
| | - Thomas Taylor-Clark
- Department of Molecular Pharmacology & Physiology, Morsani College of Medicine, University of South Florida, Tampa, Fla
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Ford AP, Undem BJ. The therapeutic promise of ATP antagonism at P2X3 receptors in respiratory and urological disorders. Front Cell Neurosci 2013; 7:267. [PMID: 24391544 PMCID: PMC3867694 DOI: 10.3389/fncel.2013.00267] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 12/03/2013] [Indexed: 01/23/2023] Open
Abstract
A sensory role for ATP was proposed long before general acceptance of its extracellular role. ATP activates and sensitizes signal transmission at multiple sites along the sensory axis, across multiple synapses. P2X and P2Y receptors mediate ATP modulation of sensory pathways and participate in dysregulation, where ATP action directly on primary afferent neurons (PANs), linking receptive field to CNS, has received much attention. Many PANs, especially C-fibers, are activated by ATP, via P2X3-containing trimers. P2X3 knock-out mice and knock-down in rats led to reduced nocifensive activity and visceral reflexes, suggesting that antagonism may offer benefit in sensory disorders. Recently, drug-like P2X3 antagonists, active in a many inflammatory and visceral pain models, have emerged. Significantly, these compounds have no overt CNS action and are inactive versus acute nociception. Selectively targeting ATP sensitization of PANs may lead to therapies that block inappropriate chronic signals at their source, decreasing drivers of peripheral and central wind-up, yet leaving defensive nociceptive and brain functions unperturbed. This article reviews this evidence, focusing on how ATP sensitization of PANs in visceral "hollow" organs primes them to chronic discomfort, irritation and pain (symptoms) as well as exacerbated autonomic reflexes (signs), and how the use of isolated organ-nerve preparations has revealed this mechanism. Urinary and airways systems share many features: dependence on continuous afferent traffic to brainstem centers to coordinate efferent autonomic outflow; loss of descending inhibitory influence in functional and sensory disorders; dependence on ATP in mediating sensory responses to diverse mechanical and chemical stimuli; a mechanistically overlapping array of existing medicines for pathological conditions. These similarities may also play out in terms of future treatment of signs and symptoms, in the potential for benefit of P2X3 antagonists.
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Affiliation(s)
| | - Bradley J Undem
- Allergy and Clinical Immunology, Johns Hopkins University School of Medicine Baltimore, MD, USA
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Muroi Y, Undem BJ. Targeting voltage gated sodium channels NaV1.7, Na V1.8, and Na V1.9 for treatment of pathological cough. Lung 2013; 192:15-20. [PMID: 24272479 DOI: 10.1007/s00408-013-9533-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 10/22/2013] [Indexed: 10/26/2022]
Abstract
Recent advances in our understanding of voltage-gated sodium channels (NaVs) lead to the rational hypothesis that drugs capable of selective blockade of NaV subtypes may be a safe and effective strategy for the treatment of unwanted cough. Among the nine NaV subtypes (NaV1.1-NaV1.9), the afferent nerves involved in initiating cough, in common with nociceptive neurons in the somatosensory system, express mainly NaV1.7, NaV1.8, and NaV1.9. Although knowledge about the effect of selectively blocking these channels on the cough reflex is limited, their biophysical properties indicate that each may contribute to the hypertussive and allotussive state that typifies subacute and chronic nonproductive cough.
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Abstract
Autonomic neural control of the intrathoracic airways aids in optimizing air flow and gas exchange. In addition, and perhaps more importantly, the autonomic nervous system contributes to host defense of the respiratory tract. These functions are accomplished by tightly regulating airway caliber, blood flow, and secretions. Although both the sympathetic and parasympathetic branches of the autonomic nervous system innervate the airways, it is the later that dominates, especially with respect to control of airway smooth muscle and secretions. Parasympathetic tone in the airways is regulated by reflex activity often initiated by activation of airway stretch receptors and polymodal nociceptors. This review discusses the preganglionic, ganglionic, and postganglionic mechanisms of airway autonomic innervation. Additionally, it provides a brief overview of how dysregulation of the airway autonomic nervous system may contribute to respiratory diseases.
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Undem BJ. Activation Mechanisms Of Airway Afferent Nerve. Auton Neurosci 2013. [DOI: 10.1016/j.autneu.2013.05.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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O'Neill J, McMahon SB, Undem BJ. Chronic cough and pain: Janus faces in sensory neurobiology? Pulm Pharmacol Ther 2013; 26:476-85. [PMID: 23831712 DOI: 10.1016/j.pupt.2013.06.010] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2013] [Revised: 06/20/2013] [Accepted: 06/26/2013] [Indexed: 10/26/2022]
Abstract
Both chronic cough and chronic pain are critical clinical issues in which a large number of patients remain unsatisfied with available treatments. These conditions have considerable effects on sufferers' quality of life, who often show co-morbidities such as anxiety and depression. There is therefore a pressing need to find new effective therapies. The basic neurobiological mechanisms and pathologies of these two conditions show substantial homologies. However, whilst chronic pain has received a great deal of attention over the last few decades, the same cannot be said for the neurological underpinnings of chronic cough. There is a substantial literature around mechanisms of chronic pain which is likely to be useful in advancing knowledge about the pathologies of chronic cough. Here we compare the basic pain and cough pathways, in addition to the clinical features and possible pathophysiologies of each; including mechanisms of peripheral and central sensitisation which may underlie symptoms such as hyperalgesia and allodynia, and hypertussitvity and allotussivity. Due to the substantial overlap that emerges, it is likely that therapies may be effective over both areas.
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Affiliation(s)
- Jessica O'Neill
- Neuroscience, Physiology and Pharmacology, University College London, UK. Jessica.o'
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Muroi Y, Ru F, Chou YL, Carr MJ, Undem BJ, Canning BJ. Selective inhibition of vagal afferent nerve pathways regulating cough using Nav 1.7 shRNA silencing in guinea pig nodose ganglia. Am J Physiol Regul Integr Comp Physiol 2013; 304:R1017-23. [PMID: 23576611 DOI: 10.1152/ajpregu.00028.2013] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Adeno-associated virus delivery systems and short hairpin RNA (shRNA) were used to selectively silence the voltage-gated sodium channel NaV 1.7 in the nodose ganglia of guinea pigs. The cough reflex in these animals was subsequently assessed. NaV 1.7 shRNA was delivered to the majority of nodose ganglia neurons [50-60% transfection rate determined by green fluorescent protein (GFP) gene cotransfection] and action potential conduction in the nodose vagal nerve fibers, as evaluated using an extracellular recording technique, was markedly and significantly reduced. By contrast, <5% of neurons in the jugular vagal ganglia neurons were transfected, and action potential conduction in the jugular vagal nerve fibers was unchanged. The control virus (with GFP expression) was without effect on action potential discharge and conduction in either ganglia. In vivo, NaV 1.7 silencing in the nodose ganglia nearly abolished cough evoked by mechanically probing the tracheal mucosa in anesthetized guinea pigs. Stimuli such as capsaicin and bradykinin that are known to stimulate both nodose and jugular C-fibers evoked coughing in conscious animals was unaffected by NaV 1.7 silencing in the nodose ganglia. Nodose C-fiber selective stimuli including adenosine, 2-methyl-5-HT, and ATP all failed to evoke coughing upon aerosol challenge. These results indicate that cough is independently regulated by two vagal afferent nerve subtypes in guinea pigs, with nodose Aδ fibers regulating cough evoked mechanically from the trachea and bradykinin- and capsaicin-evoked cough regulated by C-fibers arising from the jugular ganglia.
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Affiliation(s)
- Yukiko Muroi
- Johns Hopkins School of Medicine, Baltimore, MD, USA
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Canning BJ, Kollarik M, Meeker S, Mori N, Undem BJ. Acid evoked coughing in anesthetized guinea pigs depends upon Acid‐Sensing Ion Channel (ASIC)‐dependent activation of capsaicin‐insensitive vagal afferent neurons. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.913.39] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Undem BJ. Is nerve growth factor involved in the symptoms of rhinitis? Ann Allergy Asthma Immunol 2012; 109:154. [PMID: 22920067 DOI: 10.1016/j.anai.2012.07.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Accepted: 07/11/2012] [Indexed: 11/24/2022]
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