201
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Berecki G, Motin L, Adams DJ. Voltage-Gated R-Type Calcium Channel Inhibition via Human μ-, δ-, and κ-opioid Receptors Is Voltage-Independently Mediated by Gβγ Protein Subunits. Mol Pharmacol 2015; 89:187-96. [PMID: 26490245 DOI: 10.1124/mol.115.101154] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Accepted: 10/19/2015] [Indexed: 01/07/2023] Open
Abstract
Elucidating the mechanisms that modulate calcium channels via opioid receptor activation is fundamental to our understanding of both pain perception and how opioids modulate pain. Neuronal voltage-gated N-type calcium channels (Cav2.2) are inhibited by activation of G protein-coupled opioid receptors (ORs). However, inhibition of R-type (Cav2.3) channels by μ- or κ-ORs is poorly defined and has not been reported for δ-ORs. To investigate such interactions, we coexpressed human μ-, δ-, or κ-ORs with human Cav2.3 or Cav2.2 in human embryonic kidney 293 cells and measured depolarization-activated Ba(2+) currents (IBa). Selective agonists of μ-, δ-, and κ-ORs inhibited IBa through Cav2.3 channels by 35%. Cav2.2 channels were inhibited to a similar extent by κ-ORs, but more potently (60%) via μ- and δ-ORs. Antagonists of δ- and κ-ORs potentiated IBa amplitude mediated by Cav2.3 and Cav2.2 channels. Consistent with G protein βγ (Gβγ) interaction, modulation of Cav2.2 was primarily voltage-dependent and transiently relieved by depolarizing prepulses. In contrast, Cav2.3 modulation was voltage-independent and unaffected by depolarizing prepulses. However, Cav2.3 inhibition was sensitive to pertussis toxin and to intracellular application of guanosine 5'-[β-thio]diphosphate trilithium salt and guanosine 5'-[γ-thio]triphosphate tetralithium salt. Coexpression of Gβγ-specific scavengers-namely, the carboxyl terminus of the G protein-coupled receptor kinase 2 or membrane-targeted myristoylated-phosducin-attenuated or abolished Cav2.3 modulation. Our study reveals the diversity of OR-mediated signaling at Cav2 channels and identifies neuronal Cav2.3 channels as potential targets for opioid analgesics. Their novel modulation is dependent on pre-existing OR activity and mediated by membrane-delimited Gβγ subunits in a voltage-independent manner.
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Affiliation(s)
- Géza Berecki
- Health Innovations Research Institute, RMIT University, Melbourne, Victoria, Australia
| | - Leonid Motin
- Health Innovations Research Institute, RMIT University, Melbourne, Victoria, Australia
| | - David J Adams
- Health Innovations Research Institute, RMIT University, Melbourne, Victoria, Australia
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202
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Zamponi GW, Striessnig J, Koschak A, Dolphin AC. The Physiology, Pathology, and Pharmacology of Voltage-Gated Calcium Channels and Their Future Therapeutic Potential. Pharmacol Rev 2015; 67:821-70. [PMID: 26362469 PMCID: PMC4630564 DOI: 10.1124/pr.114.009654] [Citation(s) in RCA: 719] [Impact Index Per Article: 79.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Voltage-gated calcium channels are required for many key functions in the body. In this review, the different subtypes of voltage-gated calcium channels are described and their physiologic roles and pharmacology are outlined. We describe the current uses of drugs interacting with the different calcium channel subtypes and subunits, as well as specific areas in which there is strong potential for future drug development. Current therapeutic agents include drugs targeting L-type Ca(V)1.2 calcium channels, particularly 1,4-dihydropyridines, which are widely used in the treatment of hypertension. T-type (Ca(V)3) channels are a target of ethosuximide, widely used in absence epilepsy. The auxiliary subunit α2δ-1 is the therapeutic target of the gabapentinoid drugs, which are of value in certain epilepsies and chronic neuropathic pain. The limited use of intrathecal ziconotide, a peptide blocker of N-type (Ca(V)2.2) calcium channels, as a treatment of intractable pain, gives an indication that these channels represent excellent drug targets for various pain conditions. We describe how selectivity for different subtypes of calcium channels (e.g., Ca(V)1.2 and Ca(V)1.3 L-type channels) may be achieved in the future by exploiting differences between channel isoforms in terms of sequence and biophysical properties, variation in splicing in different target tissues, and differences in the properties of the target tissues themselves in terms of membrane potential or firing frequency. Thus, use-dependent blockers of the different isoforms could selectively block calcium channels in particular pathologies, such as nociceptive neurons in pain states or in epileptic brain circuits. Of important future potential are selective Ca(V)1.3 blockers for neuropsychiatric diseases, neuroprotection in Parkinson's disease, and resistant hypertension. In addition, selective or nonselective T-type channel blockers are considered potential therapeutic targets in epilepsy, pain, obesity, sleep, and anxiety. Use-dependent N-type calcium channel blockers are likely to be of therapeutic use in chronic pain conditions. Thus, more selective calcium channel blockers hold promise for therapeutic intervention.
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Affiliation(s)
- Gerald W Zamponi
- Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada (G.W.Z.); Department of Pharmacology and Toxicology, Institute of Pharmacy, Center for Molecular Biosciences, University of Innsbruck, Innsbruck, Austria (J.S., A.K.); and Department of Neuroscience, Physiology, and Pharmacology, Division of Biosciences, University College London, London, United Kingdom (A.C.D.)
| | - Joerg Striessnig
- Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada (G.W.Z.); Department of Pharmacology and Toxicology, Institute of Pharmacy, Center for Molecular Biosciences, University of Innsbruck, Innsbruck, Austria (J.S., A.K.); and Department of Neuroscience, Physiology, and Pharmacology, Division of Biosciences, University College London, London, United Kingdom (A.C.D.)
| | - Alexandra Koschak
- Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada (G.W.Z.); Department of Pharmacology and Toxicology, Institute of Pharmacy, Center for Molecular Biosciences, University of Innsbruck, Innsbruck, Austria (J.S., A.K.); and Department of Neuroscience, Physiology, and Pharmacology, Division of Biosciences, University College London, London, United Kingdom (A.C.D.)
| | - Annette C Dolphin
- Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada (G.W.Z.); Department of Pharmacology and Toxicology, Institute of Pharmacy, Center for Molecular Biosciences, University of Innsbruck, Innsbruck, Austria (J.S., A.K.); and Department of Neuroscience, Physiology, and Pharmacology, Division of Biosciences, University College London, London, United Kingdom (A.C.D.)
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203
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Beiteke U, Bigge S, Reichenberger C, Gralow I. [Pain and pain management in dermatology]. J Dtsch Dermatol Ges 2015; 13:967-89. [PMID: 26408456 DOI: 10.1111/ddg.10_12822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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204
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Beiteke U, Bigge S, Reichenberger C, Gralow I. Pain and pain management in dermatology. J Dtsch Dermatol Ges 2015; 13:967-87. [DOI: 10.1111/ddg.12822] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | - Ingrid Gralow
- Department of Pain Medicine; Münster University Hospital
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205
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Deba F, Bessac BF. Anoctamin-1 Cl(-) channels in nociception: activation by an N-aroylaminothiazole and capsaicin and inhibition by T16A[inh]-A01. Mol Pain 2015; 11:55. [PMID: 26364309 PMCID: PMC4567824 DOI: 10.1186/s12990-015-0061-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 09/07/2015] [Indexed: 11/29/2022] Open
Abstract
Background Anoctamin 1 (ANO1 or TMEM16A) Ca2+-gated Cl− channels of nociceptor neurons are emerging as important molecular components of peripheral pain transduction. At physiological intracellular Cl− concentrations ([Cl−]i) sensory neuronal Cl− channels are excitatory. The ability of sensory neuronal ANO1 to trigger action potentials and subsequent nocifensive (pain) responses were examined by direct activation with an N-aroylaminothiazole. ANO1 channels are also activated by intracellular Ca2+ ([Ca2+]i) from sensory neuronal TRPV1 (transient-receptor-potential vallinoid 1) ion channels and other noxicant receptors. Thus, sensory neuronal ANO1 can facilitate TRPV1 triggering of action potentials, resulting in enhanced nociception. This was investigated by reducing ANO1 facilitation of TRPV1 effects with: (1) T16A[inh]-A01 ANO1-inhibitor reagent at physiological [Cl−]i and (2) by lowering sensory neuronal [Cl−]i to switch ANO1 to be inhibitory. Results ANO1 effects on action potential firing of mouse dorsal root ganglia (DRG) neurons in vitro and mouse nocifensive behaviors in vivo were examined with an N-aroylaminothiazole ANO1-activator (E-act), a TRPV1-activator (capsaicin) and an ANO1-inhibitor (T16A[inh]-A01). At physiological [Cl−]i (40 mM), E-act (10 µM) increased current sizes (in voltage-clamp) and action potential firing (in current-clamp) recorded in DRG neurons using whole-cell electrophysiology. To not disrupt TRPV1 carried-Ca2+ activation of ANO1 in DRG neurons, ANO1 modulation of capsaicin-induced action potentials was measured by perforated-patch (Amphotericin–B) current-clamp technique. Subsequently, at physiological [Cl−]i, capsaicin (15 µM)-induced action potential firing was diminished by co-application with T16A[inh]-A01 (20 µM). Under conditions of low [Cl−]i (10 mM), ANO1 actions were reversed. Specifically, E-act did not trigger action potentials; however, capsaicin-induced action potential firing was inhibited by co-application of E-act, but was unaffected by co-application of T16A[inh]-A01. Nocifensive responses of mice hind paws were dramatically induced by subcutaneous injections of E-act (5 mM) or capsaicin (50 µM). The nocifensive responses were attenuated by co-injection with T16A[inh]-A01 (1.3 mM). Conclusions An ANO1-activator (E-act) induced [Cl−]i-dependent sensory neuronal action potentials and mouse nocifensive behaviors; thus, direct ANO1 activation can induce pain perception. ANO1-inhibition attenuated capsaicin-triggering of action potentials and capsaicin-induced nocifensive behaviors. These results indicate ANO1 channels are involved with TRPV1 actions in sensory neurons and inhibition of ANO1 could be a novel means of inducing analgesia. Electronic supplementary material The online version of this article (doi:10.1186/s12990-015-0061-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Farah Deba
- Department of Pharmaceutical Sciences, I. L. Rangel College of Pharmacy, Texas A&M Health Science Center, 1010 West Avenue B MSC 131, Kingsville, TX, 78363, USA.
| | - Bret F Bessac
- Department of Pharmaceutical Sciences, I. L. Rangel College of Pharmacy, Texas A&M Health Science Center, 1010 West Avenue B MSC 131, Kingsville, TX, 78363, USA.
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206
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Analgesic effect of a broad-spectrum dihydropyridine inhibitor of voltage-gated calcium channels. Pflugers Arch 2015; 467:2485-93. [PMID: 26286466 DOI: 10.1007/s00424-015-1725-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 07/20/2015] [Accepted: 07/23/2015] [Indexed: 01/08/2023]
Abstract
Voltage-activated calcium channels are important facilitators of nociceptive transmission in the primary afferent pathway. Consequently, molecules that block these channels are of potential use as pain therapeutics. Our group has recently reported on the identification of a novel class of dihydropyridines (DHPs) that included compounds with preferential selectivity for T-type over L-type channels. Among those compounds, M4 was found to be an equipotent inhibitor of both Cav1.2 L- and Cav3.2 T-type calcium channels. Here, we have further characterized the effects of this compound on other types of calcium channels and examined its analgesic effect when delivered either spinally (i.t.) or systemically (i.p.) to mice. Both delivery routes resulted in antinociception in a model of acute pain. Furthermore, M4 was able to reverse mechanical hyperalgesia produced by nerve injury when delivered intrathecally. M4 retained partial activity when delivered to Cav3.2 null mice, indicating that this compound acts on multiple targets. Additional whole-cell patch clamp experiments in transfected tsA-201 cells revealed that M4 also effectively blocks Cav3.3 (T-type) and Cav2.2 (N-type) currents. Altogether, our data indicate that broad-spectrum inhibition of multiple calcium channel subtypes can lead to potent analgesia in rodents.
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207
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Lapointe TK, Basso L, Iftinca MC, Flynn R, Chapman K, Dietrich G, Vergnolle N, Altier C. TRPV1 sensitization mediates postinflammatory visceral pain following acute colitis. Am J Physiol Gastrointest Liver Physiol 2015; 309:G87-99. [PMID: 26021808 DOI: 10.1152/ajpgi.00421.2014] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 05/20/2015] [Indexed: 01/31/2023]
Abstract
Quiescent phases of inflammatory bowel disease (IBD) are often accompanied by chronic abdominal pain. Although the transient receptor potential vanilloid 1 (TRPV1) ion channel has been postulated as an important mediator of visceral hypersensitivity, its functional role in postinflammatory pain remains elusive. This study aimed at establishing the role of TRPV1 in the peripheral sensitization underlying chronic visceral pain in the context of colitis. Wild-type and TRPV1-deficient mice were separated into three groups (control, acute colitis, and recovery), and experimental colitis was induced by oral administration of dextran sulfate sodium (DSS). Recovery mice showed increased chemically and mechanically evoked visceral hypersensitivity 5 wk post-DSS discontinuation, at which point inflammation had completely resolved. Significant changes in nonevoked pain-related behaviors could also be observed in these animals, indicative of persistent discomfort. These behavioral changes correlated with elevated colonic levels of substance P (SP) and TRPV1 in recovery mice, thus leading to the hypothesis that SP could sensitize TRPV1 function. In vitro experiments revealed that prolonged exposure to SP could indeed sensitize capsaicin-evoked currents in both cultured neurons and TRPV1-transfected human embryonic kidney (HEK) cells, a mechanism that involved TRPV1 ubiquitination and subsequent accumulation at the plasma membrane. Importantly, although TRPV1-deficient animals experienced similar disease severity and pain as wild-type mice in the acute phase of colitis, TRPV1 deletion prevented the development of postinflammatory visceral hypersensitivity and pain-associated behaviors. Collectively, our results suggest that chronic exposure of colon-innervating primary afferents to SP could sensitize TRPV1 and thus participate in the establishment of persistent abdominal pain following acute inflammation.
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Affiliation(s)
- Tamia K Lapointe
- Department of Physiology and Pharmacology, Inflammation Research Network, University of Calgary, Calgary, Alberta, Canada
| | - Lilian Basso
- Institut National de la Santé et de la Recherche Medicale (INSERM), Toulouse, France; Le Centre National de la Recherche Scientifique (CNRS), Toulouse, France; and Université de Toulouse III Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan (CPTP), Toulouse, France
| | - Mircea C Iftinca
- Department of Physiology and Pharmacology, Inflammation Research Network, University of Calgary, Calgary, Alberta, Canada
| | - Robyn Flynn
- Department of Physiology and Pharmacology, Inflammation Research Network, University of Calgary, Calgary, Alberta, Canada
| | - Kevin Chapman
- Department of Physiology and Pharmacology, Inflammation Research Network, University of Calgary, Calgary, Alberta, Canada
| | - Gilles Dietrich
- Institut National de la Santé et de la Recherche Medicale (INSERM), Toulouse, France; Le Centre National de la Recherche Scientifique (CNRS), Toulouse, France; and Université de Toulouse III Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan (CPTP), Toulouse, France
| | - Nathalie Vergnolle
- Department of Physiology and Pharmacology, Inflammation Research Network, University of Calgary, Calgary, Alberta, Canada; Institut National de la Santé et de la Recherche Medicale (INSERM), Toulouse, France; Le Centre National de la Recherche Scientifique (CNRS), Toulouse, France; and Université de Toulouse III Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan (CPTP), Toulouse, France
| | - Christophe Altier
- Department of Physiology and Pharmacology, Inflammation Research Network, University of Calgary, Calgary, Alberta, Canada;
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208
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Ayar A, Ozcan M, Kuzgun KT, Kalkan OF. Spinorphin inhibits membrane depolarization- and capsaicin-induced intracellular calcium signals in rat primary nociceptive dorsal root ganglion neurons in culture. J Recept Signal Transduct Res 2015; 35:550-8. [PMID: 26053512 DOI: 10.3109/10799893.2015.1024850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE Spinorphin is a potential endogenous antinociceptive agent although the mechanism(s) of its analgesic effect remain unknown. We conducted this study to investigate, by considering intracellular calcium concentrations as a key signal for nociceptive transmission, the effects of spinorphin on cytoplasmic Ca(2+) ([Ca(2+)]i) transients, evoked by high-K(+) (30 mM) depolariasation or capsaicin, and to determine whether there were any differences in the effects of spinorphin among subpopulation of cultured rat dorsal root ganglion (DRG) neurons. METHODS DRG neurons were cultured on glass coverslips following enzymatic digestion and mechanical agitation, and loaded with the calcium sensitive dye fura-2 AM (1 µM). Intracellular calcium responses in individual DRG neurons were quantified using standard fura-2 based ratiometric calcium imaging technique. All data were analyzed by using unpaired t test, p < 0.05 defining statistical significance. RESULTS Here we found that spinorphin inhibited cytoplasmic Ca(2+) ([Ca(2+)]i) transients, evoked by depolarization and capsaicin selectively in medium and small cultured rat DRG neurons. Spinorphin (10-300 µM) inhibited the Ca(2+) signals in concentration dependant manner in small- and medium diameter DRG neurons. Capsaicin produced [Ca(2+)]i responses only in small- and medium-sized DRG neurons, and pre-treatment with spinorphin significantly attenuated these [Ca(2+)]i responses. CONCLUSION Results from this study indicates that spinorphin significantly inhibits [Ca(2+)]i signaling, which are key for the modulation of cell membrane excitability and neurotransmitter release, preferably in nociceptive subtypes of this primary sensory neurons suggesting that peripheral site is involved in the pain modulating effect of this endogenous agent.
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Affiliation(s)
- Ahmet Ayar
- a Department of Physiology, Faculty of Medicine , Karadeniz Technical University , Trabzon , Turkey and
| | - Mete Ozcan
- b Department of Biophysics, Faculty of Medicine , Firat University , Elazığ , Turkey
| | - Kemal Tuğrul Kuzgun
- b Department of Biophysics, Faculty of Medicine , Firat University , Elazığ , Turkey
| | - Omer Faruk Kalkan
- a Department of Physiology, Faculty of Medicine , Karadeniz Technical University , Trabzon , Turkey and
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209
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Rouwette T, Avenali L, Sondermann J, Narayanan P, Gomez-Varela D, Schmidt M. Modulation of nociceptive ion channels and receptors via protein-protein interactions: implications for pain relief. Channels (Austin) 2015; 9:175-85. [PMID: 26039491 DOI: 10.1080/19336950.2015.1051270] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
In the last 2 decades biomedical research has provided great insights into the molecular signatures underlying painful conditions. However, chronic pain still imposes substantial challenges to researchers, clinicians and patients alike. Under pathological conditions, pain therapeutics often lack efficacy and exhibit only minimal safety profiles, which can be largely attributed to the targeting of molecules with key physiological functions throughout the body. In light of these difficulties, the identification of molecules and associated protein complexes specifically involved in chronic pain states is of paramount importance for designing selective interventions. Ion channels and receptors represent primary targets, as they critically shape nociceptive signaling from the periphery to the brain. Moreover, their function requires tight control, which is usually implemented by protein-protein interactions (PPIs). Indeed, manipulation of such PPIs entails the modulation of ion channel activity with widespread implications for influencing nociceptive signaling in a more specific way. In this review, we highlight recent advances in modulating ion channels and receptors via their PPI networks in the pursuit of relieving chronic pain. Moreover, we critically discuss the potential of targeting PPIs for developing novel pain therapies exhibiting higher efficacy and improved safety profiles.
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Affiliation(s)
- Tom Rouwette
- a Max Planck Institute for Experimental Medicine. Somatosensory Signaling Group ; Goettingen , Germany
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210
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Regulation of neuronal cav3.1 channels by cyclin-dependent kinase 5 (Cdk5). PLoS One 2015; 10:e0119134. [PMID: 25760945 PMCID: PMC4356599 DOI: 10.1371/journal.pone.0119134] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Accepted: 01/19/2015] [Indexed: 11/25/2022] Open
Abstract
Low voltage-activated (LVA) T-type Ca2+ channels activate in response to subthreshold membrane depolarizations and therefore represent an important source of Ca2+ influx near the resting membrane potential. In neurons, these proteins significantly contribute to control relevant physiological processes including neuronal excitability, pacemaking and post-inhibitory rebound burst firing. Three subtypes of T-type channels (Cav3.1 to Cav3.3) have been identified, and using functional expression of recombinant channels diverse studies have validated the notion that T-type Ca2+ channels can be modulated by various endogenous ligands as well as by second messenger pathways. In this context, the present study reveals a previously unrecognized role for cyclin-dependent kinase 5 (Cdk5) in the regulation of native T-type channels in N1E-115 neuroblastoma cells, as well as recombinant Cav3.1channels heterologously expressed in HEK-293 cells. Cdk5 and its co-activators play critical roles in the regulation of neuronal differentiation, cortical lamination, neuronal cell migration and axon outgrowth. Our results show that overexpression of Cdk5 causes a significant increase in whole cell patch clamp currents through T-type channels in N1E-115 cells, while siRNA knockdown of Cdk5 greatly reduced these currents. Consistent with this, overexpression of Cdk5 in HEK-293 cells stably expressing Cav3.1channels upregulates macroscopic currents. Furthermore, using site-directed mutagenesis we identified a major phosphorylation site at serine 2234 within the C-terminal region of the Cav3.1subunit. These results highlight a novel role for Cdk5 in the regulation of T-type Ca2+ channels.
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211
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Hildebrand ME, Snutch TP. The unusual suspects: Regulation of retinal calcium channels by somatostatin. Channels (Austin) 2015; 9:61-2. [PMID: 25715059 PMCID: PMC4594440 DOI: 10.1080/19336950.2015.1018000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
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Bladen C, McDaniel SW, Gadotti VM, Petrov RR, Berger ND, Diaz P, Zamponi GW. Characterization of novel cannabinoid based T-type calcium channel blockers with analgesic effects. ACS Chem Neurosci 2015; 6:277-87. [PMID: 25314588 PMCID: PMC4372069 DOI: 10.1021/cn500206a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
![]()
Low-voltage-activated
(T-type) calcium channels are important regulators
of the transmission of nociceptive information in the primary afferent
pathway and finding ligands that modulate these channels is a key
focus of the drug discovery field. Recently, we characterized a set
of novel compounds with mixed cannabinoid receptor/T-type channel
blocking activity and examined their analgesic effects in animal models
of pain. Here, we have built on these previous findings and synthesized
a new series of small organic compounds. We then screened them using
whole-cell voltage clamp techniques to identify the most potent T-type
calcium channel inhibitors. The two most potent blockers (compounds 9 and 10) were then characterized using radioligand
binding assays to determine their affinity for CB1 and CB2 receptors.
The structure–activity relationship and optimization studies
have led to the discovery of a new T-type calcium channel blocker,
compound 9. Compound 9 was efficacious in
mediating analgesia in mouse models of acute inflammatory pain and
in reducing tactile allodynia in the partial nerve ligation model.
This compound was shown to be ineffective in Cav3.2 T-type calcium
channel null mice at therapeutically relevant concentrations, and
it caused no significant motor deficits in open field tests. Taken
together, our data reveal a novel class of compounds whose physiological
and therapeutic actions are mediated through block of Cav3.2 calcium
channels.
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Affiliation(s)
- Chris Bladen
- Department of Physiology & Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Steven W. McDaniel
- Core
Laboratory for Neuromolecular Production, The University of Montana, Missoula, Montana 59812, United States
| | - Vinicius M. Gadotti
- Department of Physiology & Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Ravil R. Petrov
- Core
Laboratory for Neuromolecular Production, The University of Montana, Missoula, Montana 59812, United States
| | - N. Daniel Berger
- Department of Physiology & Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Philippe Diaz
- Core
Laboratory for Neuromolecular Production, The University of Montana, Missoula, Montana 59812, United States
| | - Gerald W. Zamponi
- Department of Physiology & Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada
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Mickle AD, Shepherd AJ, Mohapatra DP. Sensory TRP channels: the key transducers of nociception and pain. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2015; 131:73-118. [PMID: 25744671 DOI: 10.1016/bs.pmbts.2015.01.002] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Peripheral detection of nociceptive and painful stimuli by sensory neurons involves a complex repertoire of molecular detectors and/or transducers on distinct subsets of nerve fibers. The majority of such molecular detectors/transducers belong to the transient receptor potential (TRP) family of cation channels, which comprise both specific receptors for distinct nociceptive stimuli, as well as for multiple stimuli. This chapter discusses the classification, distribution, and functional properties of individual TRP channel types that have been implicated in various nociceptive and/or painful conditions.
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Affiliation(s)
- Aaron D Mickle
- Department of Pharmacology, The University of Iowa Roy J. and Lucile A. Carver College of Medicine, Iowa City, Iowa, USA; Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Andrew J Shepherd
- Department of Pharmacology, The University of Iowa Roy J. and Lucile A. Carver College of Medicine, Iowa City, Iowa, USA; Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Durga P Mohapatra
- Department of Pharmacology, The University of Iowa Roy J. and Lucile A. Carver College of Medicine, Iowa City, Iowa, USA; Department of Anesthesia, The University of Iowa Roy J. and Lucile A. Carver College of Medicine, Iowa City, Iowa, USA; Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA.
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214
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Altier C. Spicing up the sensation of stretch: TRPV1 controls mechanosensitive Piezo channels. Sci Signal 2015; 8:fs3. [PMID: 25670201 DOI: 10.1126/scisignal.aaa6769] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Piezo proteins--a family of mammalian cation-selective ion channels that respond to mechanical stretch--are molecular mediators of biological processes, including vascular tone, hearing, touch, and pain. In this issue of Science Signaling, Rohacs and colleagues demonstrate that activation of the heat-sensitive transient receptor potential vanilloid 1 (TRPV1), another cation channel, inhibits Piezo channels through a calcium-induced depletion of phosphoinositides. This regulation could contribute to the cellular mechanisms by which the TRPV1 activator capsaicin mitigates mechanical hypersensitivity.
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Affiliation(s)
- Christophe Altier
- Department of Physiology and Pharmacology, Snyder Institute for Chronic Diseases. Inflammation Research Network, University of Calgary, Calgary, Alberta T2N 4N1, Canada.
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François A, Schüetter N, Laffray S, Sanguesa J, Pizzoccaro A, Dubel S, Mantilleri A, Nargeot J, Noël J, Wood JN, Moqrich A, Pongs O, Bourinet E. The Low-Threshold Calcium Channel Cav3.2 Determines Low-Threshold Mechanoreceptor Function. Cell Rep 2015; 10:370-382. [PMID: 25600872 DOI: 10.1016/j.celrep.2014.12.042] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 11/14/2014] [Accepted: 12/18/2014] [Indexed: 12/12/2022] Open
Abstract
The T-type calcium channel Cav3.2 emerges as a key regulator of sensory functions, but its expression pattern within primary afferent neurons and its contribution to modality-specific signaling remain obscure. Here, we elucidate this issue using a unique knockin/flox mouse strain wherein Cav3.2 is replaced by a functional Cav3.2-surface-ecliptic GFP fusion. We demonstrate that Cav3.2 is a selective marker of two major low-threshold mechanoreceptors (LTMRs), Aδ- and C-LTMRs, innervating the most abundant skin hair follicles. The presence of Cav3.2 along LTMR-fiber trajectories is consistent with critical roles at multiple sites, setting their strong excitability. Strikingly, the C-LTMR-specific knockout uncovers that Cav3.2 regulates light-touch perception and noxious mechanical cold and chemical sensations and is essential to build up that debilitates allodynic symptoms of neuropathic pain, a mechanism thought to be entirely A-LTMR specific. Collectively, our findings support a fundamental role for Cav3.2 in touch/pain pathophysiology, validating their critic pharmacological relevance to relieve mechanical and cold allodynia.
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Affiliation(s)
- Amaury François
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, 141 rue de la Cardonille, 34094 Montpellier, France; CNRS UMR5203, 34095 Montpellier, France; INSERM, U661, 34095 Montpellier, France; Université de Montpellier, 34095 Montpellier, France
| | - Niklas Schüetter
- Department of Physiology, University of Saarland, School of Medicine, Kirrberger Straße 1, 66424 Homburg, Germany
| | - Sophie Laffray
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, 141 rue de la Cardonille, 34094 Montpellier, France; CNRS UMR5203, 34095 Montpellier, France; INSERM, U661, 34095 Montpellier, France; Université de Montpellier, 34095 Montpellier, France
| | - Juan Sanguesa
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, 141 rue de la Cardonille, 34094 Montpellier, France; CNRS UMR5203, 34095 Montpellier, France; INSERM, U661, 34095 Montpellier, France; Université de Montpellier, 34095 Montpellier, France
| | - Anne Pizzoccaro
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, 141 rue de la Cardonille, 34094 Montpellier, France; CNRS UMR5203, 34095 Montpellier, France; INSERM, U661, 34095 Montpellier, France; Université de Montpellier, 34095 Montpellier, France
| | - Stefan Dubel
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, 141 rue de la Cardonille, 34094 Montpellier, France; CNRS UMR5203, 34095 Montpellier, France; INSERM, U661, 34095 Montpellier, France; Université de Montpellier, 34095 Montpellier, France
| | - Annabelle Mantilleri
- Aix-Marseille-Université, CNRS, Institut de Biologie du Développement de Marseille, UMR 7288, 13288 Marseille, France
| | - Joel Nargeot
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, 141 rue de la Cardonille, 34094 Montpellier, France; CNRS UMR5203, 34095 Montpellier, France; INSERM, U661, 34095 Montpellier, France; Université de Montpellier, 34095 Montpellier, France
| | - Jacques Noël
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, 141 rue de la Cardonille, 34094 Montpellier, France; Université de Nice Sophia Antipolis, Institut de Pharmacologie Moléculaire et Cellulaire, UMR7275 CNRS, 660 route des lucioles, 06560 Valbonne, France
| | - John N Wood
- Wolfson Institute for Biomedical Research, University College London, Gower Street, London WC1E 6BT, UK
| | - Aziz Moqrich
- Aix-Marseille-Université, CNRS, Institut de Biologie du Développement de Marseille, UMR 7288, 13288 Marseille, France
| | - Olaf Pongs
- Department of Physiology, University of Saarland, School of Medicine, Kirrberger Straße 1, 66424 Homburg, Germany
| | - Emmanuel Bourinet
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, 141 rue de la Cardonille, 34094 Montpellier, France; CNRS UMR5203, 34095 Montpellier, France; INSERM, U661, 34095 Montpellier, France; Université de Montpellier, 34095 Montpellier, France.
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216
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Berger ND, Gadotti VM, Petrov RR, Chapman K, Diaz P, Zamponi GW. NMP-7 inhibits chronic inflammatory and neuropathic pain via block of Cav3.2 T-type calcium channels and activation of CB2 receptors. Mol Pain 2014; 10:77. [PMID: 25481027 PMCID: PMC4271433 DOI: 10.1186/1744-8069-10-77] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 12/02/2014] [Indexed: 11/15/2022] Open
Abstract
Background T-type calcium channels and cannabinoid receptors are known to play important roles in chronic pain, making them attractive therapeutic targets. We recently reported on the design, synthesis and analgesic properties of a novel T-type channel inhibitor (NMP-7), which also shows mixed agonist activity on CB1 and CB2 receptors in vitro. Here, we analyzed the analgesic effect of systemically delivered NMP-7 (intraperitoneal (i.p.) or intragstric (i.g.) routes) on mechanical hypersensitivity in inflammatory pain induced by Complete Freund’s Adjuvant (CFA) and neuropathic pain induced by sciatic nerve injury. Results NMP-7 delivered by either i.p. or i.g. routes produced dose-dependent inhibition of mechanical hyperalgesia in mouse models of inflammatory and neuropathic pain, without altering spontaneous locomotor activity in the open-field test at the highest active dose. Neither i.p. nor i.g. treatment reduced peripheral inflammation per se, as evaluated by examining paw edema and myeloperoxidase activity. The antinociception produced by NMP-7 in the CFA test was completely abolished in CaV3.2-null mice, confirming CaV3.2 as a key target. The analgesic action of intraperitoneally delivered NMP-7 was not affected by pretreatment of mice with the CB1 antagonist AM281, but was significantly attenuated by pretreatment with the CB2 antagonist AM630, suggesting that CB2 receptors, but not CB1 receptors are involved in the action of NMP-7 in vivo. Conclusions Overall, our work shows that NMP-7 mediates a significant analgesic effect in a model of persistent inflammatory and chronic neuropathic pain by way of T-type channel modulation and CB2 receptor activation. Thus, this study provides a novel therapeutic avenue for managing chronic pain conditions via mixed CB ligands/T-type channel blockers.
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Affiliation(s)
| | | | | | | | | | - Gerald W Zamponi
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Canada.
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217
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García-Caballero A, Gadotti VM, Stemkowski P, Weiss N, Souza IA, Hodgkinson V, Bladen C, Chen L, Hamid J, Pizzoccaro A, Deage M, François A, Bourinet E, Zamponi GW. The deubiquitinating enzyme USP5 modulates neuropathic and inflammatory pain by enhancing Cav3.2 channel activity. Neuron 2014; 83:1144-58. [PMID: 25189210 DOI: 10.1016/j.neuron.2014.07.036] [Citation(s) in RCA: 187] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2014] [Indexed: 12/22/2022]
Abstract
T-type calcium channels are essential contributors to the transmission of nociceptive signals in the primary afferent pain pathway. Here, we show that T-type calcium channels are ubiquitinated by WWP1, a plasma-membrane-associated ubiquitin ligase that binds to the intracellular domain III-IV linker region of the Cav3.2 T-type channel and modifies specific lysine residues in this region. A proteomic screen identified the deubiquitinating enzyme USP5 as a Cav3.2 III-IV linker interacting partner. Knockdown of USP5 via shRNA increases Cav3.2 ubiquitination, decreases Cav3.2 protein levels, and reduces Cav3.2 whole-cell currents. In vivo knockdown of USP5 or uncoupling USP5 from native Cav3.2 channels via intrathecal delivery of Tat peptides mediates analgesia in both inflammatory and neuropathic mouse models of mechanical hypersensitivity. Altogether, our experiments reveal a cell signaling pathway that regulates T-type channel activity and their role in nociceptive signaling.
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Affiliation(s)
- Agustin García-Caballero
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Vinicius M Gadotti
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Patrick Stemkowski
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Norbert Weiss
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Ivana A Souza
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Victoria Hodgkinson
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Chris Bladen
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Lina Chen
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Jawed Hamid
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Anne Pizzoccaro
- Laboratories of Excellence in Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, CNRS UMR5203, INSERM U661, IFR3 Universités Montpellier I&II, Montpellier, France
| | - Mickael Deage
- Laboratories of Excellence in Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, CNRS UMR5203, INSERM U661, IFR3 Universités Montpellier I&II, Montpellier, France
| | - Amaury François
- Laboratories of Excellence in Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, CNRS UMR5203, INSERM U661, IFR3 Universités Montpellier I&II, Montpellier, France
| | - Emmanuel Bourinet
- Laboratories of Excellence in Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, CNRS UMR5203, INSERM U661, IFR3 Universités Montpellier I&II, Montpellier, France
| | - Gerald W Zamponi
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
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218
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Veldhuis NA, Poole DP, Grace M, McIntyre P, Bunnett NW. The G Protein–Coupled Receptor–Transient Receptor Potential Channel Axis: Molecular Insights for Targeting Disorders of Sensation and Inflammation. Pharmacol Rev 2014; 67:36-73. [DOI: 10.1124/pr.114.009555] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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219
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Stemkowski PL, Zamponi GW. The tao of IGF-1: insulin-like growth factor receptor activation increases pain by enhancing T-type calcium channel activity. Sci Signal 2014; 7:pe23. [PMID: 25292211 DOI: 10.1126/scisignal.2005826] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
T-type calcium channels are important players in the transmission of pain signals in the primary afferent pathway. Indeed, inhibiting or depleting T-type calcium channels in dorsal root ganglion (DRG) neurons mediates analgesia. Conversely, nerve injury or peripheral inflammation have been shown to induce T-type calcium channel activity in DRG neurons, and this in turn has been linked to the development of chronic pain states. The mechanisms that underlie this enhancement of T-type channels remain incompletely understood and may include changes in channel stability in the plasma membrane or alterations in channel function. In this issue of Science Signaling, Zhang and colleagues identify a cell signaling pathway that potently regulates T-type calcium channel activity in afferent neurons and link this process to pain hypersensitivity. Specifically, they show that insulin-like growth factor-1 receptors in DRG neurons mediate a protein kinase C α (PKCα)-dependent enhancement of T-type calcium currents and that interfering with this pathway reduces both mechanical and thermal pain hypersensitivity in rodents. Targeting this process offers a new avenue for developing pain therapeutics.
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Affiliation(s)
- Patrick L Stemkowski
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta T2N 4N1, Canada
| | - Gerald W Zamponi
- Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta T2N 4N1, Canada.
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220
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Lindy AS, Parekh PK, Zhu R, Kanju P, Chintapalli SV, Tsvilovskyy V, Patterson RL, Anishkin A, van Rossum DB, Liedtke WB. TRPV channel-mediated calcium transients in nociceptor neurons are dispensable for avoidance behaviour. Nat Commun 2014; 5:4734. [PMID: 25178952 PMCID: PMC4164786 DOI: 10.1038/ncomms5734] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Accepted: 07/17/2014] [Indexed: 12/21/2022] Open
Abstract
Animals need to sense and react to potentially dangerous environments. TRP ion channels participate in nociception, presumably via Ca2+ influx, in most animal species. However, the relationship between ion permeation and animals’ nocifensive behaviour is unknown. Here we use an invertebrate animal model with relevance for mammalian pain. We analyse the putative selectivity filter of OSM-9, a TRPV channel, in osmotic avoidance behaviour of Caenorhabditis elegans. Using mutagenized OSM-9 expressed in the head nociceptor neuron, ASH, we study nocifensive behaviour and Ca2+ influx. Within the selectivity filter, M601-F609, Y604G strongly reduces avoidance behaviour and eliminates Ca2+ transients. Y604F also abolishes Ca2+ transients in ASH, while sustaining avoidance behaviour, yet it disrupts behavioral plasticity. Homology modelling of the OSM-9 pore suggests that Y604 may assume a scaffolding role. Thus, aromatic residues in the OSM-9 selectivity filter are critical for pain behaviour and ion permeation. These findings have relevance for understanding evolutionary roots of mammalian nociception. TRPs are calcium-permeable channels involved in the sensing of damaging stimuli but the relationship between calcium influx and pain behaviour has been elusive. Here the authors find that the TRP channel OSM-9 functions as an ion channel in vivo in C. elegans, and establish residues that are critical for worm pain-like behaviour.
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Affiliation(s)
- Amanda S Lindy
- 1] Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710, USA [2] Department of Neurology, Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Puja K Parekh
- Department of Neurology, Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Richard Zhu
- Department of Neurology, Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Patrick Kanju
- Department of Neurology, Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Sree V Chintapalli
- 1] Department of Membrane Biology and Physiology, University of California, Davis, California 95616, USA [2] Department of Biochemistry and Molecular Medicine, University of California, Davis, California 95616, USA
| | - Volodymyr Tsvilovskyy
- Department of Pharmacology, University of Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany
| | - Randen L Patterson
- 1] Department of Membrane Biology and Physiology, University of California, Davis, California 95616, USA [2] Department of Biochemistry and Molecular Medicine, University of California, Davis, California 95616, USA
| | - Andriy Anishkin
- 1] Center for Computational Proteomics, The Pennsylvania State University, University Park, Pennsylvania 16801, USA [2] Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania 16801, USA
| | - Damian B van Rossum
- 1] Center for Computational Proteomics, The Pennsylvania State University, University Park, Pennsylvania 16801, USA [2] Department of Biology, The Pennsylvania State University, University Park, Pennsylvania 16801, USA
| | - Wolfgang B Liedtke
- 1] Department of Neurology, Duke University Medical Center, Durham, North Carolina 27710, USA [2] Duke University Clinics for Pain and Palliative Care, 932 Morreene Road, Durham, North Carolina 27705, USA [3] Departments of Anesthesiology and Neurobiology, Duke University Medical Center, Durham, North Carolina 27710, USA [4] Department of Neurobiology, Duke University Medical Center, Durham, North Carolina 27710, USA
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221
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Pan B, Guo Y, Kwok WM, Hogan Q, Wu HE. Sigma-1 receptor antagonism restores injury-induced decrease of voltage-gated Ca2+ current in sensory neurons. J Pharmacol Exp Ther 2014; 350:290-300. [PMID: 24891452 PMCID: PMC4109486 DOI: 10.1124/jpet.114.214320] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Accepted: 05/29/2014] [Indexed: 01/01/2023] Open
Abstract
Sigma-1 receptor (σ1R), an endoplasmic reticulum-chaperone protein, can modulate painful response after peripheral nerve injury. We have demonstrated that voltage-gated calcium current is inhibited in axotomized sensory neurons. We examined whether σ1R contributes to the sensory dysfunction of voltage-gated calcium channel (VGCC) after peripheral nerve injury through electrophysiological approach in dissociated rat dorsal root ganglion (DRG) neurons. Animals received either skin incision (Control) or spinal nerve ligation (SNL). Both σ1R agonists, (+)pentazocine (PTZ) and DTG [1,3-di-(2-tolyl)guanidine], dose dependently inhibited calcium current (ICa) with Ba(2+) as charge carrier in control sensory neurons. The inhibitory effect of σ1R agonists on ICa was blocked by σ1R antagonist, BD1063 (1-[2-(3,4-dichlorophenyl)ethyl]-4-methylpiperazine dihydrochloride) or BD1047 (N-[2-(3,4-dichlorophenyl)ethyl]-N-methyl-2-(dimethylamino)ethylamine dihydrobromide). PTZ and DTG showed similar effect on ICa in axotomized fifth DRG neurons (SNL L5). Both PTZ and DTG shifted the voltage-dependent activation and steady-state inactivation of VGCC to the left and accelerated VGCC inactivation rate in both Control and axotomized L5 SNL DRG neurons. The σ1R antagonist, BD1063 (10 μM), increases ICa in SNL L5 neurons but had no effect on Control and noninjured fourth lumbar neurons in SNL rats. Together, the findings suggest that activation of σR1 decreases ICa in sensory neurons and may play a pivotal role in pain generation.
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Affiliation(s)
- Bin Pan
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin (B.P., Y.G., W.-M.K., Q.H., H.-e.W.); and Department of Anesthesiology, Zablocki Veterans Affairs Medical Center, Milwaukee, Wisconsin (Q.H.)
| | - Yuan Guo
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin (B.P., Y.G., W.-M.K., Q.H., H.-e.W.); and Department of Anesthesiology, Zablocki Veterans Affairs Medical Center, Milwaukee, Wisconsin (Q.H.)
| | - Wai-Meng Kwok
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin (B.P., Y.G., W.-M.K., Q.H., H.-e.W.); and Department of Anesthesiology, Zablocki Veterans Affairs Medical Center, Milwaukee, Wisconsin (Q.H.)
| | - Quinn Hogan
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin (B.P., Y.G., W.-M.K., Q.H., H.-e.W.); and Department of Anesthesiology, Zablocki Veterans Affairs Medical Center, Milwaukee, Wisconsin (Q.H.)
| | - Hsiang-en Wu
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin (B.P., Y.G., W.-M.K., Q.H., H.-e.W.); and Department of Anesthesiology, Zablocki Veterans Affairs Medical Center, Milwaukee, Wisconsin (Q.H.)
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222
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Hagenston AM, Simonetti M. Neuronal calcium signaling in chronic pain. Cell Tissue Res 2014; 357:407-26. [PMID: 25012522 DOI: 10.1007/s00441-014-1942-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 06/03/2014] [Indexed: 01/03/2023]
Abstract
Acute physiological pain, the unpleasant sensory response to a noxious stimulus, is essential for animals and humans to avoid potential injury. Pathological pain that persists after the original insult or injury has subsided, however, not only results in individual suffering but also imposes a significant cost on society. Improving treatments for long-lasting pathological pain requires a comprehensive understanding of the biological mechanisms underlying pain perception and the development of pain chronicity. In this review, we aim to highlight some of the major findings related to the involvement of neuronal calcium signaling in the processes that mediate chronic pain.
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Affiliation(s)
- Anna M Hagenston
- University of Heidelberg, Neurobiology, Im Neuenheimer Feld 364, 69120, Heidelberg, Germany,
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223
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Bladen C, Gadotti VM, Gündüz MG, Berger ND, Şimşek R, Şafak C, Zamponi GW. 1,4-Dihydropyridine derivatives with T-type calcium channel blocking activity attenuate inflammatory and neuropathic pain. Pflugers Arch 2014; 467:1237-47. [DOI: 10.1007/s00424-014-1566-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 06/24/2014] [Accepted: 06/24/2014] [Indexed: 02/04/2023]
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224
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Flynn R, Chapman K, Iftinca M, Aboushousha R, Varela D, Altier C. Targeting the transient receptor potential vanilloid type 1 (TRPV1) assembly domain attenuates inflammation-induced hypersensitivity. J Biol Chem 2014; 289:16675-87. [PMID: 24808184 DOI: 10.1074/jbc.m114.558668] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The transient receptor potential channel vanilloid type 1 (TRPV1) is a non-selective cation channel expressed in sensory neurons of the dorsal root and trigeminal ganglia. TRPV1 is a polymodal channel activated by noxious heat, capsaicin, and protons. As a sensor for noxious stimuli, TRPV1 channel has been described as a key contributor to pain signaling. To form a functional channel, TRPV1 subunits must assemble into tetramers, and several studies have identified the TRPV1 C terminus as an essential element in subunit association. Here we combined biochemical assays with electrophysiology and imaging-based bimolecular fluorescence complementation (BiFC) and bioluminescence resonance energy transfer (BRET) in live cells to identify a short motif in the C-terminal tail of the TRPV1 subunit that governs channel assembly. Removing this region through early truncation or targeted deletion results in loss of subunit association and channel function. Importantly, we found that interfering with TRPV1 subunit association using a plasma membrane-tethered peptide attenuated mechanical and thermal hypersensitivity in two mouse models of inflammatory hyperalgesia. This represents a novel mechanism to disrupt TRPV1 subunit assembly and hence may offer a new analgesic tool for pain relief.
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Affiliation(s)
- Robyn Flynn
- From the Department of Physiology and Pharmacology and Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta T2N 4N1, Canada and
| | - Kevin Chapman
- From the Department of Physiology and Pharmacology and Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta T2N 4N1, Canada and
| | - Mircea Iftinca
- From the Department of Physiology and Pharmacology and Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta T2N 4N1, Canada and
| | - Reem Aboushousha
- From the Department of Physiology and Pharmacology and Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta T2N 4N1, Canada and
| | - Diego Varela
- Centro de Estudios Moleculares de la Celula and Instituto de Ciencias Biomedicas, Facultad de Medicina, Universidad de Chile, Santiago, 8380453, Chile
| | - Christophe Altier
- From the Department of Physiology and Pharmacology and Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta T2N 4N1, Canada and
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225
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Gangarossa G, Laffray S, Bourinet E, Valjent E. T-type calcium channel Cav3.2 deficient mice show elevated anxiety, impaired memory and reduced sensitivity to psychostimulants. Front Behav Neurosci 2014; 8:92. [PMID: 24672455 PMCID: PMC3957728 DOI: 10.3389/fnbeh.2014.00092] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 03/03/2014] [Indexed: 01/28/2023] Open
Abstract
The fine-tuning of neuronal excitability relies on a tight control of Ca2+ homeostasis. The low voltage-activated (LVA) T-type calcium channels (Cav3.1, Cav3.2 and Cav3.3 isoforms) play a critical role in regulating these processes. Despite their wide expression throughout the central nervous system, the implication of T-type Cav3.2 isoform in brain functions is still poorly characterized. Here, we investigate the effect of genetic ablation of this isoform in affective disorders, including anxiety, cognitive functions as well as sensitivity to drugs of abuse. Using a wide range of behavioral assays we show that genetic ablation of the cacna1h gene results in an anxiety-like phenotype, whereas novelty-induced locomotor activity is unaffected. Deletion of the T-type channel Cav3.2 also triggers impairment of hippocampus-dependent recognition memories. Acute and sensitized hyperlocomotion induced by d-amphetamine and cocaine are dramatically reduced in T-type Cav3.2 deficient mice. In addition, the administration of the T-type blocker TTA-A2 prevented the expression of locomotor sensitization observed in wildtype mice. In conclusion, our data reveal that physiological activity of this specific Ca2+ channel is required for affective and cognitive behaviors. Moreover, our work highlights the interest of T-type channel blockers as therapeutic strategies to reverse drug-associated alterations.
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Affiliation(s)
- Giuseppe Gangarossa
- Institut de Génomique Fonctionnelle, CNRS UMR-5203, Montpellier, France ; INSERM U661, Montpellier, France ; Universités de Montpellier 1 and 2 UMR-5203, Montpellier, France
| | - Sophie Laffray
- Institut de Génomique Fonctionnelle, CNRS UMR-5203, Montpellier, France ; INSERM U661, Montpellier, France ; Universités de Montpellier 1 and 2 UMR-5203, Montpellier, France ; Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle Montpellier, France
| | - Emmanuel Bourinet
- Institut de Génomique Fonctionnelle, CNRS UMR-5203, Montpellier, France ; INSERM U661, Montpellier, France ; Universités de Montpellier 1 and 2 UMR-5203, Montpellier, France ; Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle Montpellier, France
| | - Emmanuel Valjent
- Institut de Génomique Fonctionnelle, CNRS UMR-5203, Montpellier, France ; INSERM U661, Montpellier, France ; Universités de Montpellier 1 and 2 UMR-5203, Montpellier, France
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Waxman SG, Zamponi GW. Regulating excitability of peripheral afferents: emerging ion channel targets. Nat Neurosci 2014; 17:153-63. [DOI: 10.1038/nn.3602] [Citation(s) in RCA: 285] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Accepted: 11/08/2013] [Indexed: 12/13/2022]
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