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Lorenzoni R, Barreto F, Contri RV, de Araújo BV, Pohlman AR, Costa TD, Guterres SS. Rapid and sensitive LC-MS/MS method for simultaneous quantification of capsaicin and dihydrocapsaicin in microdialysis samples following dermal application. J Pharm Biomed Anal 2019; 173:126-133. [DOI: 10.1016/j.jpba.2019.05.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 05/13/2019] [Accepted: 05/14/2019] [Indexed: 11/16/2022]
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2
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Pérez de Vega MJ, Fernandez-Mendivil C, de la Torre Martínez R, González-Rodríguez S, Mullet J, Sala F, Sala S, Criado M, Moreno-Fernández S, Miguel M, Fernández-Carvajal A, Ferrer-Montiel A, López MG, González-Muñiz R. 1-(2',5'-Dihydroxyphenyl)-3-(2-fluoro-4-hydroxyphenyl)-1-propanone (RGM079): A Positive Allosteric Modulator of α7 Nicotinic Receptors with Analgesic and Neuroprotective Activity. ACS Chem Neurosci 2019; 10:3900-3909. [PMID: 31322853 DOI: 10.1021/acschemneuro.9b00364] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Acetylcholine α7 nicotinic receptors are widely expressed in the brain, where they are involved in the central processing of pain as well as in neuropsychiatric, neurodegenerative, and inflammatory processes. Positive allosteric modulators (PAMs) show the advantage of allowing the selective regulation of different subtypes of acetylcholine receptors without directly interacting with the agonist binding site. Here, we report the preparation and biological activity of a fluoro-containing compound, 1-(2',5'-dihydroxyphenyl)-3-(2-fluoro-4-hydroxyphenyl)-1-propanone (8, RGM079), that behaves as a potent PAM of the α7 receptors and has a balanced pharmacokinetic profile and antioxidant properties comparable or even higher than well-known natural polyphenols. In addition, compound RGM079 shows neuroprotective properties in Alzheimer's disease (AD)-toxicity related models. Thus, it causes a concentration-dependent neuroprotective effect against the toxicity induced by okadaic acid (OA) in the human neuroblastoma cell line SH-SY5Y. Similarly, in primary cultures of rat cortical neurons, RGM079 is able to restore the cellular viability after exposure to OA and amyloid peptide Aβ1-42, with cell death almost completely prevented at 10 and 30 μM, respectively. Finally, compound RGM079 shows in vivo analgesic activity in the complete Freund's adjuvant (CFA)-induced paw inflammation model after intraperitoneal administration.
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Affiliation(s)
| | - Cristina Fernandez-Mendivil
- Instituto Teófilo Hernando, Department of Pharmacology, Universidad Autónoma de Madrid, Arzobispo Morcillo 4, Madrid 28029, Spain
| | - Roberto de la Torre Martínez
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universidad Miguel Hernández, Avenida de la Universidad s/n, Elche, Alicante 03202, Spain
| | - Sara González-Rodríguez
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universidad Miguel Hernández, Avenida de la Universidad s/n, Elche, Alicante 03202, Spain
| | - José Mullet
- Instituto de Neurociencias, Universidad Miguel Hernández-CSIC, Sant Joan d’Alacant, Alicante 03500, Spain
| | - Francisco Sala
- Instituto de Neurociencias, Universidad Miguel Hernández-CSIC, Sant Joan d’Alacant, Alicante 03500, Spain
| | - Salvador Sala
- Instituto de Neurociencias, Universidad Miguel Hernández-CSIC, Sant Joan d’Alacant, Alicante 03500, Spain
| | - Manuel Criado
- Instituto de Neurociencias, Universidad Miguel Hernández-CSIC, Sant Joan d’Alacant, Alicante 03500, Spain
| | - Silvia Moreno-Fernández
- Instituto de Investigación en Ciencias de la Alimentación (CSIC-UAM), C/Nicolás Cabrera 9, Madrid 28049, Spain
| | - Marta Miguel
- Instituto de Investigación en Ciencias de la Alimentación (CSIC-UAM), C/Nicolás Cabrera 9, Madrid 28049, Spain
| | - Asia Fernández-Carvajal
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universidad Miguel Hernández, Avenida de la Universidad s/n, Elche, Alicante 03202, Spain
| | - Antonio Ferrer-Montiel
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universidad Miguel Hernández, Avenida de la Universidad s/n, Elche, Alicante 03202, Spain
| | - Manuela G. López
- Instituto Teófilo Hernando, Department of Pharmacology, Universidad Autónoma de Madrid, Arzobispo Morcillo 4, Madrid 28029, Spain
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1,3-diphenylpropan-1-ones as allosteric modulators of α7 nACh receptors with analgesic and antioxidant properties. Future Med Chem 2016; 8:731-49. [PMID: 27161515 DOI: 10.4155/fmc-2015-0001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
UNLABELLED Nicotine acethylcholine receptors (nAChRs) play critical roles in cognitive processes, neuroprotection and inflammation. RESULTS According to their substituents, 1,3-diphenylpropan-1-one derivatives act as α7 nAChRs negative allosteric modulators (NAM, OMe) or Type I positive allosteric modulators (PAMs, OH). Compounds 7 and 31 were the most effective (989 and 666% enhancement of ACh-induced currents) and potent (EC50: 12.9 and 6.85 μM) PAMs. They exhibited strong radical scavenging values. Compound 31, selective over other neuronal nAChR subtypes and with acceptable pharmacokinetic profile, showed antinociceptive effects in a model of inflammatory pain. CONCLUSION Compound 31 is a novel, potent and selective α7 nAChR PAM, displaying antioxidant and analgesic activities. The 1,3-diphenylpropan-1-one scaffold could be the base toward more advanced type I PAMs for the treatment of nAChR-mediated diseases.
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Boadas-Vaello P, Castany S, Homs J, Álvarez-Pérez B, Deulofeu M, Verdú E. Neuroplasticity of ascending and descending pathways after somatosensory system injury: reviewing knowledge to identify neuropathic pain therapeutic targets. Spinal Cord 2016; 54:330-40. [DOI: 10.1038/sc.2015.225] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 11/25/2015] [Accepted: 11/28/2015] [Indexed: 12/16/2022]
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5
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Planells-Cases1 R, Ferrer-Montiel A. Drug design and development through the vanilloid receptor. Expert Opin Drug Discov 2015; 2:1053-63. [PMID: 23484872 DOI: 10.1517/17460441.2.8.1053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The vanilloid receptor (TRPV1) has attracted a great expectation in pain therapeutics for the treatment of chronic inflammatory conditions. As a result, several drug discovery programmes were launched in the past years that yielded a large number of receptor agonists and antagonists. However, despite the claimed therapeutic potential of TRPV1 modulators, a disappointing number of candidates have progressed into clinical trials and those were only for dental pain and migraine, indicating that our understanding of the role of TRPV1 in pain is still very limited. The widespread distribution of TRPV1 in different tissues suggests an involvement in body functions other than pain. Indeed, new findings indicate that TRPV1 is tonically active in physiological conditions and its pharmacological blockade leads to hyperthermia. Furthermore, the full abrogation of TRPV1 in some models of chronic pain results in enhanced pain. Therefore, a remaining challenge is the development of drugs that preserve the physiological activity of TRPV1 and downregulate the function of overactive receptors.
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Jiang X, Wang Y, Zhu H, Wang Y, Zhao M, Zhao S, Wu J, Li S, Peng S. Modifying tetramethyl-nitrophenyl-imidazoline with amino acids: design, synthesis, and 3D-QSAR for improving inflammatory pain therapy. DRUG DESIGN DEVELOPMENT AND THERAPY 2015; 9:2329-42. [PMID: 25960636 PMCID: PMC4410827 DOI: 10.2147/dddt.s76218] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
With the help of pharmacophore analysis and docking investigation, 15 novel 1-(4,4,5,5-tetramethyl-2-(3-nitrophenyl)-4,5-dihydroimidazol-1-yl)-oxyacetyl-L-amino acids (6a-o) were designed, synthesized, and assayed. On tail-flick and xylene-induced ear edema models, 10 μmol/kg 6a-o exhibited excellent oral anti-inflammation and analgesic activity. The dose-dependent assay of their representative 6f indicates that the effective dose should be 3.3 μmol/kg. The correlation of the three-dimensional quantitative structure-activity relationship with the docking analysis provides a basis for the rational design of drugs to treat inflammatory pain.
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Affiliation(s)
- Xueyun Jiang
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, College of Pharmaceutical Sciences, Capital Medical University, Beijing, People's Republic of China
| | - Yuji Wang
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, College of Pharmaceutical Sciences, Capital Medical University, Beijing, People's Republic of China
| | - Haimei Zhu
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, College of Pharmaceutical Sciences, Capital Medical University, Beijing, People's Republic of China
| | - Yaonan Wang
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, College of Pharmaceutical Sciences, Capital Medical University, Beijing, People's Republic of China
| | - Ming Zhao
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, College of Pharmaceutical Sciences, Capital Medical University, Beijing, People's Republic of China ; Faculty of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Shurui Zhao
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, College of Pharmaceutical Sciences, Capital Medical University, Beijing, People's Republic of China
| | - Jianhui Wu
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, College of Pharmaceutical Sciences, Capital Medical University, Beijing, People's Republic of China
| | - Shan Li
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, College of Pharmaceutical Sciences, Capital Medical University, Beijing, People's Republic of China
| | - Shiqi Peng
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, College of Pharmaceutical Sciences, Capital Medical University, Beijing, People's Republic of China
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TRPM8 ion channels differentially modulate proliferation and cell cycle distribution of normal and cancer prostate cells. PLoS One 2012; 7:e51825. [PMID: 23251635 PMCID: PMC3522609 DOI: 10.1371/journal.pone.0051825] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Accepted: 11/06/2012] [Indexed: 11/19/2022] Open
Abstract
Overexpression of the cation-permeable channel TRPM8 in prostate cancers might represent a novel opportunity for their treatment. Inhibitors of TRPM8 reduce the growth of prostate cancer cells. We have used two recently described and highly specific blockers, AMTB and JNJ41876666, and RNAi to determine the relevance of TRPM8 expression in the proliferation of non-tumor and tumor cells. Inhibition of the expression or function of the channel reduces proliferation rates and proliferative fraction in all tumor cells tested, but not of non-tumor prostate cells. We observed no consistent acceleration of growth after stimulation of the channel with menthol or icilin, indicating that basal TRPM8 expression is enough to sustain growth of prostate cancer cells.
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8
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Ponsati B, Carreño C, Curto-Reyes V, Valenzuela B, Duart MJ, Van den Nest W, Cauli O, Beltran B, Fernandez J, Borsini F, Caprioli A, Di Serio S, Veretchy M, Baamonde A, Menendez L, Barros F, de la Pena P, Borges R, Felipo V, Planells-Cases R, Ferrer-Montiel A. An inhibitor of neuronal exocytosis (DD04107) displays long-lasting in vivo activity against chronic inflammatory and neuropathic pain. J Pharmacol Exp Ther 2012; 341:634-45. [PMID: 22393248 DOI: 10.1124/jpet.111.190678] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Small peptides patterned after the N terminus of the synaptosomal protein of 25 kDa, a member of the protein complex implicated in Ca(2+)-dependent neuronal exocytosis, inhibit in vitro the release of neuromodulators involved in pain signaling, suggesting an in vivo analgesic activity. Here, we report that compound DD04107 (palmitoyl-EEMQRR-NH(2)), a 6-mer palmitoylated peptide that blocks the inflammatory recruitment of ion channels to the plasma membrane of nociceptors and the release of calcitonin gene-related peptide from primary sensory neurons, displays potent and long-lasting in vivo antihyperalgesia and antiallodynia in chronic models of inflammatory and neuropathic pain, such as the complete Freund's adjuvant, osteosarcoma, chemotherapy, and diabetic neuropathic models. Subcutaneous administration of the peptide produced a dose-dependent antihyperalgesic and antiallodynic activity that lasted ≥24 h. The compound showed a systemic distribution, characterized by a bicompartmental pharmacokinetic profile. Safety pharmacology studies indicated that the peptide is largely devoid of side effects and substantiated that the in vivo activity is not caused by locomotor impairment. Therefore, DD04107 is a potent and long-lasting antinociceptive compound that displays a safe pharmacological profile. These findings support the notion that neuronal exocytosis of receptors and neuronal algogens pivotally contribute to chronic inflammatory and neuropathic pain and imply a central role of peptidergic nociceptor sensitization to the pathogenesis of pain.
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9
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Vidal-Mosquera M, Fernández-Carvajal A, Moure A, Valente P, Planells-Cases R, González-Ros JM, Bujons J, Ferrer-Montiel A, Messeguer A. Triazine-Based Vanilloid 1 Receptor Open Channel Blockers: Design, Synthesis, Evaluation, and SAR Analysis. J Med Chem 2011; 54:7441-52. [DOI: 10.1021/jm200981s] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | - Pierluigi Valente
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernandez, 03202 Elche, Spain
| | | | - José M. González-Ros
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernandez, 03202 Elche, Spain
| | | | - Antonio Ferrer-Montiel
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernandez, 03202 Elche, Spain
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10
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Gerona-Navarro G, González-Muñiz R, Fernández-Carvajal A, González-Ros JM, Ferrer-Montiel A, Carreño C, Albericio F, Royo M. Solid-phase synthesis of a library of amphipatic hydantoins. Discovery of new hits for TRPV1 blockade. ACS COMBINATORIAL SCIENCE 2011; 13:458-65. [PMID: 21671576 PMCID: PMC3296451 DOI: 10.1021/co1000986] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Some heterocyclic systems, called privileged scaffolds, appear frequently in bioactive products and marketed drugs. The combination of a recognized privileged scaffold (hydantoin) and a functional group with high incidence in bioactive molecules (guanidine) guided the design of a library of amphipatic compounds, which allowed the discovery of novel TRPV1 ion channel blockers. The library was synthesized by parallel solid-phase synthesis from an orthogonally protected resin-bound Lys-Lys skeleton. Key steps of the synthetic procedure were the construction of the hydantoin ring, by reaction of the N-terminal amino group with N,N-disuccinimidyl carbonate (DSC) and subsequent base-induced cyclization, and the guanidinylation of the C-terminal Lys side-chain after removal of the Alloc protecting-group. The preliminary biological studies have allowed the identification of some of the key structural features directing the blockage of capsaicin-induced Ca(2+) influx through TRPV1 channels, particularly, the strong preference showed for highly lipophilic acyl groups and substituted guanidine moieties. Active compounds based on this new pharmacophoric scaffold that display in vitro and in vivo inhibitory activity.
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Affiliation(s)
| | | | - Asia Fernández-Carvajal
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Av. de la Universidad, 03202 Elche, Spain
| | - José M. González-Ros
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Av. de la Universidad, 03202 Elche, Spain
| | - Antonio Ferrer-Montiel
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Av. de la Universidad, 03202 Elche, Spain
- DiverDrugs SL. Isaac Peral 17 (Pol. Ind. Camí Ral), 08850 Gavà, Spain
| | - Cristina Carreño
- DiverDrugs SL. Isaac Peral 17 (Pol. Ind. Camí Ral), 08850 Gavà, Spain
| | - Fernando Albericio
- Institute for Research in Biomedicine, Barcelona Science Park, Baldiri Reixac 10, 08028 Barcelona, Spain
- CIBER-BBN, Networking Centre on Bioengineering, Biomaterials, and Nanomedicine, Barcelona Science Park, University of Barcelona, Baldiri Reixac 10, 08028 Barcelona, Spain
- Department of Organic Chemistry, University of Barcelona, Martí i Franqués 1-11, 08028 Barcelona, Spain
| | - Miriam Royo
- CIBER-BBN, Networking Centre on Bioengineering, Biomaterials, and Nanomedicine, Barcelona Science Park, University of Barcelona, Baldiri Reixac 10, 08028 Barcelona, Spain
- Combinatorial Chemistry Unit, Barcelona Science Park, University of Barcelona, Baldiri Reixac 10, 08028 Barcelona, Spain
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11
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Xenon fails to inhibit capsaicin-evoked CGRP release by nociceptors in culture. Neurosci Lett 2011; 499:124-6. [DOI: 10.1016/j.neulet.2011.05.051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Revised: 04/26/2011] [Accepted: 05/19/2011] [Indexed: 11/17/2022]
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12
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Valente P, Fernández-Carvajal A, Camprubí-Robles M, Gomis A, Quirce S, Viana F, Fernández-Ballester G, González-Ros JM, Belmonte C, Planells-Cases R, Ferrer-Montiel A. Membrane-tethered peptides patterned after the TRP domain (TRPducins) selectively inhibit TRPV1 channel activity. FASEB J 2011; 25:1628-40. [PMID: 21307333 DOI: 10.1096/fj.10-174433] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The transient receptor potential vanilloid 1 (TRPV1) channel is a thermosensory receptor implicated in diverse physiological and pathological processes. The TRP domain, a highly conserved region in the C terminus adjacent to the internal channel gate, is critical for subunit tetramerization and channel gating. Here, we show that cell-penetrating, membrane-anchored peptides patterned after this protein domain are moderate and selective TRPV1 antagonists both in vitro and in vivo, blocking receptor activity in intact rat primary sensory neurons and their peripheral axons with mean decline time of 30 min. The most potent lipopeptide, TRP-p5, blocked all modes of TRPV1 gating with micromolar efficacy (IC(50)<10 μM), without significantly affecting other thermoTRP channels. In contrast, its retrosequence or the corresponding sequences of other TRPV channels did not alter TRPV1 channel activity (IC(50)>100 μM). TRP-p5 did not affect the capsaicin sensitivity of the vanilloid receptor. Our data suggest that TRP-p5 interferes with protein-protein interactions at the level of the TRP domain that are essential for the "conformational" change that leads to gate opening. Therefore, these palmitoylated peptides, which we termed TRPducins, are noncompetitive, voltage-independent, sequence-specific TRPV1 blockers. Our findings indicate that TRPducin-like peptides may embody a novel molecular strategy that can be exploited to generate a selective pharmacological arsenal for the TRP superfamily of ion channels.
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Affiliation(s)
- Pierluigi Valente
- Instituto de Biología Molecular y Celular, Universidad Miguel Herna´ndez, Elche, Spain
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13
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White JPM, Calcott G, Jenes A, Hossein M, Paule CC, Santha P, Davis JB, Ma D, Rice ASC, Nagy I. Xenon reduces activation of transient receptor potential vanilloid type 1 (TRPV1) in rat dorsal root ganglion cells and in human TRPV1-expressing HEK293 cells. Life Sci 2011; 88:141-9. [PMID: 21056583 DOI: 10.1016/j.lfs.2010.11.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2010] [Revised: 09/20/2010] [Accepted: 10/27/2010] [Indexed: 11/19/2022]
Abstract
AIMS Xenon provides effective analgesia in several pain states at sub-anaesthetic doses. Our aim was to examine whether xenon may mediate its analgesic effect, in part, through reducing the activity of transient receptor potential vanilloid type 1 (TRPV1), a receptor known to be involved in certain inflammatory pain conditions. MAIN METHODS We studied the effect of xenon on capsaicin-evoked cobalt uptake in rat cultured primary sensory neurons and in human TRPV1 (hTRPV1)-expressing human embryonic kidney 293 (HEK293) cells. We also examined xenon's effect on the phosphorylation of extracellular signal-regulated kinase 1/2 (ERK1/2) in the rat spinal dorsal horn evoked by hind-paw injection of capsaicin. KEY FINDINGS Xenon (75%) reduced the number of primary sensory neurons responding to the TRPV1 agonist, capsaicin (100 nM-1 μM) by ~25% to ~50%. Xenon reduced the number of heterologously-expressed hTRPV1 activated by 300 nM capsaicin by ~50%. Xenon (80%) reduced by ~40% the number of phosphorylated ERK1/2-expressing neurons in rat spinal dorsal horn resulting from hind-paw capsaicin injection. SIGNIFICANCE Xenon substantially reduces the activity of TRPV1 in response to noxious stimulation by the specific TRPV1 agonist, capsaicin, suggesting a possible role for xenon as an adjunct analgesic where hTRPV1 is an active contributor to the excitation of primary afferents which initiates the pain sensation.
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Affiliation(s)
- John P M White
- Anaesthetics, Pain Medicine and Intensive Care Section, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, Chelsea and Westminster Hospital, 369, Fulham Road, London, SW10 9NH, United Kingdom
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14
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Pharmacological and functional properties of TRPM8 channels in prostate tumor cells. Pflugers Arch 2010; 461:99-114. [PMID: 21052713 DOI: 10.1007/s00424-010-0895-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2010] [Revised: 10/09/2010] [Accepted: 10/11/2010] [Indexed: 10/18/2022]
Abstract
Prostate cancer (PC) is a major health problem in adult males. TRPM8, a cationic TRP channel activated by cooling and menthol is upregulated in PC. However, the precise role of TRPM8 in PC is still unclear. Some studies hypothesized that TRPM8-mediated transmembrane Ca(2+) fluxes play a key role in cellular proliferation of PC cells. In contrast, other findings suggest that high TRPM8 levels may reduce the metastatic potential of PC cells. A detailed understanding of the response of TRPM8 channels to pharmacological modulators of their activity is relevant when considering potential therapies, targeting this ion channel to treat PC. We characterized the pharmacological and functional properties of native TRPM8 channels in four human prostate cell lines, PNT1A, LNCaP, DU145, and PC3, commonly used as experimental models of PC. PNT1A is a non-tumoral prostate cell line while the other three correspond to different stages of PC. Here, we show that cold- and agonist-evoked [Ca(2+)](i) responses in PC cells are much less sensitive to well-characterized agonists (menthol and icilin) and antagonists (BCTC, clotrimazole, and DD01050) of TRPM8 channels, compared to TRPM8 channels in other tissues, suggesting a different molecular composition and/or spatial organization. In addition, the forced overexpression of human TRPM8 facilitated the trafficking of TRPM8 channels residing in the endoplasmic reticulum to the plasma membrane, leading to a marked potentiation in the efficacy of the different blockers. These results predict that blockers of canonical TRPM8 channels may be less effective in halting proliferation of PC cells than expected.
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15
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Kang G, Zhao M, Zhang X, Peng L, Li C, Mao W, Ye W, Peng S. A class of novel conjugates of substituted purine and Gly-AA-OBzl: Synthesis and evaluation of orally analgesic activity. Bioorg Med Chem Lett 2010; 20:6157-60. [DOI: 10.1016/j.bmcl.2009.05.077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2009] [Revised: 05/03/2009] [Accepted: 05/18/2009] [Indexed: 11/26/2022]
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16
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Costa B, Bettoni I, Petrosino S, Comelli F, Giagnoni G, Di Marzo V. The dual fatty acid amide hydrolase/TRPV1 blocker, N-arachidonoyl-serotonin, relieves carrageenan-induced inflammation and hyperalgesia in mice. Pharmacol Res 2010; 61:537-46. [PMID: 20138997 DOI: 10.1016/j.phrs.2010.02.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Revised: 01/18/2010] [Accepted: 02/01/2010] [Indexed: 01/08/2023]
Abstract
Given that the pharmacological or genetic inactivation of fatty acid amide hydrolase (FAAH) counteracts pain and inflammation, and on the basis of the established involvement of transient receptor potential vanilloid type-1 (TRPV1) channels in inflammatory pain, we tested the capability of a dual FAAH/TRPV1 blocker, N-arachidonoyl-serotonin (AA-5-HT), to relieve oedema and pain in a model of acute inflammation, and compared its efficacy with that of a single FAAH inhibitor (URB597) or TRPV1 antagonist (capsazepine). Acute inflammation was induced by intraplantar injection of lambda-carrageenan into mice and the anti-inflammatory and anti-nociceptive actions of AA-5-HT were assessed at different doses, time points and treatment schedule. In addition, endocannabinoid levels were measured in paw skin and spinal cord. Systemic administration of AA-5-HT elicited dose-dependent anti-oedemigen and anti-nociceptive effects, whereas it was devoid of efficacy when given locally. When tested in a therapeutic regimen, the compound retained comparable anti-inflammatory effects. TRPV1 receptor mediated the anti-inflammatory property of AA-5-HT, whereas both CB(1) and TRPV1 receptors were involved in its anti-hyperalgesic activity. These effects were accompanied by an increase of the levels of the endocannabinoid anandamide (AEA) in both inflamed paw and spinal cord. AA-5-HT was more potent than capsazepine as anti-oedemigen and anti-hyperalgesic drug, whereas it shows an anti-oedemigen property similar to URB597, which was, however, devoid of the anti-nociceptive effect. AA-5-HT did not induce unwanted effects on locomotion and body temperature. In conclusion AA-5-HT has both anti-inflammatory and anti-hyperalgesic properties and its employment offers advantages, in terms of efficacy and lack of adverse effects, deriving from its dual activity.
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Affiliation(s)
- Barbara Costa
- Department of Biotechnology and Bioscience, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy.
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17
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Zhou Y, Zhao M, Wu Y, Li C, Wu J, Zheng M, Peng L, Peng S. A class of novel Schiff's bases: Synthesis, therapeutic action for chronic pain, anti-inflammation and 3D QSAR analysis. Bioorg Med Chem 2010; 18:2165-2172. [PMID: 20176491 DOI: 10.1016/j.bmc.2010.01.075] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2009] [Revised: 01/29/2010] [Accepted: 01/30/2010] [Indexed: 11/26/2022]
Abstract
To discover analgesics for treating chronic pain 17 novel Schiff's bases, N,N'-(Z-allylidene-1,3-diyl)bisamino acid methyl esters were prepared from 1,1,3,3,-tetramethoxypropane and amino acid methyl esters. On tail-flick mouse model 20 micromol/kg of these Schiff's bases were orally administered, the analgesic action started 30 min after administration, reached the maximum 120 min after administration, and at 180 min this action was still observed. On a xylene-induced ear edema mouse model 20 micromol/kg of these Schiff's bases exhibited desirable anti-inflammation. Thus the present Schiff's bases are able to treat chronic pain from inflammation. The effect of the side chains of the amino acid residues of these Schiff's bases on the analgesic activity was explained with 3D QSAR.
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Affiliation(s)
- Yinjian Zhou
- College of Pharmaceutical Sciences, Peking University, Beijing 100083, PR China
| | - Ming Zhao
- College of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Yingting Wu
- College of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Chunyu Li
- College of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Jianhui Wu
- College of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Meiqing Zheng
- College of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Li Peng
- College of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Shiqi Peng
- College of Pharmaceutical Sciences, Peking University, Beijing 100083, PR China; College of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, PR China
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18
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Abstract
Acidosis is a noxious condition associated with inflammation, ischaemia or defective acid containment. As a consequence, acid sensing has evolved as an important property of afferent neurons with unmyelinated and thinly myelinated nerve fibres. Protons evoke multiple currents in primary afferent neurons, which are carried by several acid-sensitive ion channels. Among these, acid-sensing ion channels (ASICs) and transient receptor potential (TRP) vanilloid-1 (TRPV1) ion channels have been most thoroughly studied. ASICs survey moderate decreases in extracellular pH, whereas TRPV1 is activated only by severe acidosis resulting in pH values below 6. Two-pore-domain K(+) (K(2P)) channels are differentially regulated by small deviations of extra- or intracellular pH from physiological levels. Other acid-sensitive channels include TRPV4, TRPC4, TRPC5, TRPP2 (PKD2L1), ionotropic purinoceptors (P2X), inward rectifier K(+) channels, voltage-activated K(+) channels, L-type Ca(2+) channels, hyperpolarization-activated cyclic nucleotide gated channels, gap junction channels, and Cl(-) channels. In addition, acid-sensitive G protein coupled receptors have also been identified. Most of these molecular acid sensors are expressed by primary sensory neurons, although to different degrees and in various combinations. Emerging evidence indicates that many of the acid-sensitive ion channels and receptors play a role in acid sensing, acid-induced pain and acid-evoked feedback regulation of homeostatic reactions. The existence and apparent redundancy of multiple pH surveillance systems attests to the concept that acid-base regulation is a vital issue for cell and tissue homeostasis. Since upregulation and overactivity of acid sensors appear to contribute to various forms of chronic pain, acid-sensitive ion channels and receptors are considered as targets for novel analgesic drugs. This approach will only be successful if the pathological implications of acid sensors can be differentiated pharmacologically from their physiological function.
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Affiliation(s)
- Peter Holzer
- Research Unit of Translational Neurogastroenterology, Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Universitätsplatz 4, 8010, Graz, Austria.
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19
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TRPC channels and diacylglycerol dependent calcium signaling in rat sensory neurons. Histochem Cell Biol 2008; 130:655-67. [DOI: 10.1007/s00418-008-0477-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/03/2008] [Indexed: 10/21/2022]
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20
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Andreev YA, Kozlov SA, Koshelev SG, Ivanova EA, Monastyrnaya MM, Kozlovskaya EP, Grishin EV. Analgesic compound from sea anemone Heteractis crispa is the first polypeptide inhibitor of vanilloid receptor 1 (TRPV1). J Biol Chem 2008; 283:23914-21. [PMID: 18579526 DOI: 10.1074/jbc.m800776200] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Venomous animals from distinct phyla such as spiders, scorpions, snakes, cone snails, or sea anemones produce small toxic proteins interacting with a variety of cell targets. Their bites often cause pain. One of the ways of pain generation is the activation of TRPV1 channels. Screening of 30 different venoms from spiders and sea anemones for modulation of TRPV1 activity revealed inhibitors in tropical sea anemone Heteractis crispa venom. Several separation steps resulted in isolation of an inhibiting compound. This is a 56-residue-long polypeptide named APHC1 that has a Bos taurus trypsin inhibitor (BPTI)/Kunitz-type fold, mostly represented by serine protease inhibitors and ion channel blockers. APHC1 acted as a partial antagonist of capsaicin-induced currents (32 +/- 9% inhibition) with half-maximal effective concentration (EC(50)) 54 +/- 4 nm. In vivo, a 0.1 mg/kg dose of APHC1 significantly prolonged tail-flick latency and reduced capsaicin-induced acute pain. Therefore, our results can make an important contribution to the research into molecular mechanisms of TRPV1 modulation and help to solve the problem of overactivity of this receptor during a number of pathological processes in the organism.
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Affiliation(s)
- Yaroslav A Andreev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, ul. Miklukho-Maklaya 16/10, Moscow.
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21
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A role of the transient receptor potential domain of vanilloid receptor I in channel gating. J Neurosci 2007; 27:11641-50. [PMID: 17959807 DOI: 10.1523/jneurosci.2457-07.2007] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Transient receptor potential vanilloid receptor subtype 1 (TRPV1) is an ionotropic receptor activated by temperature and chemical stimuli. The C-terminal region that is adjacent to the channel gate, recognized as the TRP domain, is a molecular determinant of receptor assembly. However, the role of this intracellular domain in channel function remains elusive. Here, we show that replacement of the TRP domain of TRPV1 with the cognate region of TRPV channels (TRPV2-TRPV6) did not affect receptor assembly and trafficking to the cell surface, although those receptors containing the TRP domain of the distantly related TRPV5 and TRPV6 did not display ion channel activity. Notably, functional chimeras exhibited an impaired sensitivity to the activating stimuli, consistent with a significant contribution of this protein domain to channel function. At variance with TRPV1, voltage-dependent gating of chimeric channels could not be detected in the absence of capsaicin and/or heat. Biophysical analysis of functional chimeras revealed that the TRP domain appears to act as a molecular determinant of the activation energy of channel gating. Together, these findings uncover a role of the TRP domain in intersubunit interactions near the channel gate that contribute to the coupling of stimulus sensing to channel opening.
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22
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Quintanar-Audelo M, Fernández-Carvajal A, Van Den Nest W, Carreño C, Ferrer-Montiel A, Albericio F. Design and synthesis of indole-based peptoids as potent noncompetitive antagonists of transient receptor potential vanilloid 1. J Med Chem 2007; 50:6133-43. [PMID: 17985859 DOI: 10.1021/jm070612v] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The vanilloid receptor subunit 1, or transient receptor potential vanilloid 1 (TRPV1), integrates physical and chemical stimuli in the peripheral nervous system, playing a key role in inflammatory pain. Identification of potent TRPV1 antagonists is thus an important goal of current neuropharmacology. Herein, we describe the solid-phase synthesis of a series of indole-based peptoids (N-alkylglycines) and the biological activity of the peptoids as novel TRPV1 antagonists. The potency and selectivity of the compounds were determined by electrophysiological recordings in Xenopus oocytes. The most potent and selective noncompetitive TRPV1 antagonist of the series, compound 7, represents an interesting pharmacophoric structure for analgesic lead optimization.
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Affiliation(s)
- Martina Quintanar-Audelo
- Department of Organic Chemistry, IRB Barcelona, Barcelona Science Park, University of Barcelona, Spain
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23
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Levine JD, Alessandri-Haber N. TRP channels: Targets for the relief of pain. Biochim Biophys Acta Mol Basis Dis 2007; 1772:989-1003. [PMID: 17321113 DOI: 10.1016/j.bbadis.2007.01.008] [Citation(s) in RCA: 254] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2006] [Revised: 01/12/2007] [Accepted: 01/16/2007] [Indexed: 02/01/2023]
Abstract
Patients with inflammatory or neuropathic pain experience hypersensitivity to mechanical, thermal and/or chemical stimuli. Given the diverse etiologies and molecular mechanisms of these pain syndromes, an approach to developing successful therapies may be to target ion channels that contribute to the detection of thermal, mechanical and chemical stimuli and promote the sensitization and activation of nociceptors. Transient Receptor Potential (TRP) channels have emerged as a family of evolutionarily conserved ligand-gated ion channels that contribute to the detection of physical stimuli. Six TRPs (TRPV1, TRPV2, TRPV3, TRPV4, TRPM8 and TRPA1) have been shown to be expressed in primary afferent nociceptors, pain sensing neurons, where they act as transducers for thermal, chemical and mechanical stimuli. This short review focuses on their contribution to pain hypersensitivity associated with peripheral inflammatory and neuropathic pain states.
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Affiliation(s)
- Jon D Levine
- Department of Oral and Maxillofacial Surgery, Box 0440, University of California, San Francisco, 521 Parnassus Avenue, San Francisco, CA 94143-0440, USA
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