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Dewaker V, Sharma AR, Debnath U, Park ST, Kim HS. Insights from molecular dynamics simulations of TRPV1 channel modulators in pain. Drug Discov Today 2023; 28:103798. [PMID: 37838068 DOI: 10.1016/j.drudis.2023.103798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 09/28/2023] [Accepted: 10/09/2023] [Indexed: 10/16/2023]
Abstract
TRPV1 is a nonselective cation channel vital for detecting noxious stimuli (heat, acid, capsaicin). Its role in pain makes it a potential drug target for chronic pain management, migraines, and related disorders. This review updates molecular dynamics (MD) simulation studies on the TRPV1 channel, focusing on its gating mechanism, ligand-binding sites, and implications for drug design. The article also explores challenges in developing modulators, SAR optimization, and clinical trial studies. Efforts have been undertaken to concisely present MD simulation findings, with a focus on their relevance to drug discovery.
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Affiliation(s)
- Varun Dewaker
- Institute of New Frontier Research Team, Hallym University, Chuncheon-si 24252, Gangwon-do, Republic of Korea
| | - Ashish R Sharma
- Institute for Skeletal Aging & Orthopedic Surgery, Hallym University-Chuncheon Sacred Heart Hospital, Chuncheon-si 24252, Gangwon-do, Republic of Korea
| | - Utsab Debnath
- School of Health Sciences & Technology, UPES, Dehradun, Uttarakhand 248007, India
| | - Sung Taek Park
- Institute of New Frontier Research Team, Hallym University, Chuncheon-si 24252, Gangwon-do, Republic of Korea; Department of Obstetrics and Gynecology, Kangnam Sacred-Heart Hospital, Hallym University Medical Center, Hallym University College of Medicine, Seoul 07441, Republic of Korea; EIONCELL Inc., Chuncheon 24252, Republic of Korea
| | - Hyeong Su Kim
- Institute of New Frontier Research Team, Hallym University, Chuncheon-si 24252, Gangwon-do, Republic of Korea; Division of Hemato-Oncology, Department of Internal Medicine, Kangnam Sacred-Heart Hospital, Hallym University Medical Center, Hallym University College of Medicine, Seoul 07441, Republic of Korea; EIONCELL Inc., Chuncheon 24252, Republic of Korea.
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2
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Bustos D, Galarza C, Ordoñez W, Brauchi S, Benso B. Cost-Effective Pipeline for a Rational Design and Selection of Capsaicin Analogues Targeting TRPV1 Channels. ACS OMEGA 2023; 8:11736-11749. [PMID: 37033853 PMCID: PMC10077575 DOI: 10.1021/acsomega.2c05672] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 11/25/2022] [Indexed: 06/19/2023]
Abstract
Transient receptor potential (TRP) channels constitute a large group of membrane receptors associated with sensory pathways in vertebrates. One of the most studied is TRPV1, a polymodal receptor tuned for detecting heat and pungent compounds. Specific inhibition of the nociceptive transduction at the peripheral nerve represents a convenient approach to pain relief. While acting as a chemoreceptor, TRPV1 shows high sensitivity and selectivity for capsaicin. In contrast to the drugs available on the market that target the inflammatory system, TRPV1 antagonists act as negative modulators of nociceptive transduction. Therefore, the development of compounds modulating TRPV1 activity has expanded dramatically over time. Experimental data suggest that most agonist and antagonist drugs interact at or near capsaicin's binding site. In particular, the properties of capsaicin's head play an essential role in modulating potency and affinity. Here, we explored a cost-efficient pipeline to predict the effects of introducing chemical modifications into capsaicin's head region. An extensive set of molecules was selected by first considering the geometrical properties of capsaicin's binding site and then molecular docking. Finally, the novel ligands were ranked by combining molecular and pharmacokinetic predictions.
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Affiliation(s)
- Daniel Bustos
- Centro
de Investigación de Estudios Avanzados del Maule (CIEAM), Vicerrectoría
de Investigación y Postgrado, Universidad
Católica del Maule, Talca 3460000, Chile
- Laboratorio
de Bioinformática y Química Computacional, Departamento
de Medicina Traslacional, Facultad de Medicina, Universidad Católica del Maule, Talca 3480094, Chile
| | - Christian Galarza
- Facultad
de Ciencias Naturales y Matemáticas, Escuela Superior Politécnica del Litoral, ESPOL, Guayaquil 090703, Ecuador
| | - Wilson Ordoñez
- Facultad
de Ciencias Naturales y Matemáticas, Escuela Superior Politécnica del Litoral, ESPOL, Guayaquil 090703, Ecuador
| | - Sebastian Brauchi
- Department
of Physiology, Faculty of Medicine, Universidad
Austral de Chile, Valdivia 5090000, Chile
- Millennium
Nucleus of Ion Channels Associated Diseases (MiNICAD), 8330024, Chile
| | - Bruna Benso
- Millennium
Nucleus of Ion Channels Associated Diseases (MiNICAD), 8330024, Chile
- School of
Dentistry, Faculty of Medicine, Pontificia
Universidad Católica de Chile, Santiago 8330024, Chile
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3
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Treat A, Henri V, Liu J, Shen J, Gil-Silva M, Morales A, Rade A, Tidgewell KJ, Kolber B, Shen Y. Novel TRPV1 Modulators with Reduced Pungency Induce Analgesic Effects in Mice. ACS OMEGA 2022; 7:2929-2946. [PMID: 35097287 PMCID: PMC8793056 DOI: 10.1021/acsomega.1c05727] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 12/31/2021] [Indexed: 06/14/2023]
Abstract
Capsaicin, the compound in hot chili peppers responsible for their pungency and an agonist of the transient receptor potential cation channel, subfamily V, member 1 (TRPV1), has long been known to promote the desensitization of nociceptors at high concentrations. This has led to the utilization and implementation of topical capsaicin cream as an analgesic to treat acute and chronic pain. Critically, the application of capsaicin cream is limited due to capsaicin's high pungency, which is experienced prior to analgesia. To combat this issue, novel capsaicin analogues were developed to provide analgesia with reduced pungency. Analogues reported in this paper add to and show some differences from previous structure-activity relationship (SAR) studies of capsaicin-like molecules against TRPV1, including the necessity of phenol in the aromatic "A-region", the secondary amide in the "B-region", and modifications in the hydrophobic "C-region". This provided a new framework for de novo small-molecule design using capsaicin as the starting point. In this study, we describe the synthesis of capsaicin analogues, their in vitro activity in Ca2+ assays, and initial in vivo pungency and feasibility studies of capsaicin analogues YB-11 and YB-16 as analgesics. Our results demonstrate that male and female mice treated with YB capsaicin analogues showed diminished pain-associated behavior in the spontaneous formalin assay as well as reduced thermal sensitivity in the hotplate assay.
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Affiliation(s)
- Anny Treat
- Department
of Neuroscience and Center for Advanced Pain Studies, University of Texas at Dallas, 800 W. Campbell Road, Richardson, Texas 75080, United States
| | - Vianie Henri
- Department
of Biological Sciences, Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, United States
- Graduate
School of Pharmaceutical Sciences, Duquesne
University, 600 Forbes
Avenue, Pittsburgh, Pennsylvania 15282, United States
| | - Junke Liu
- Young
BioPharma, LLC, 110 Canal
Street, 4th Floor, Lowell, Massachusetts 01852, United States
| | - Joyce Shen
- Young
BioPharma, LLC, 110 Canal
Street, 4th Floor, Lowell, Massachusetts 01852, United States
| | - Mauricio Gil-Silva
- Department
of Neuroscience and Center for Advanced Pain Studies, University of Texas at Dallas, 800 W. Campbell Road, Richardson, Texas 75080, United States
| | - Alejandro Morales
- Department
of Neuroscience and Center for Advanced Pain Studies, University of Texas at Dallas, 800 W. Campbell Road, Richardson, Texas 75080, United States
| | - Avaneesh Rade
- Department
of Neuroscience and Center for Advanced Pain Studies, University of Texas at Dallas, 800 W. Campbell Road, Richardson, Texas 75080, United States
| | - Kevin Joseph Tidgewell
- Graduate
School of Pharmaceutical Sciences, Duquesne
University, 600 Forbes
Avenue, Pittsburgh, Pennsylvania 15282, United States
| | - Benedict Kolber
- Department
of Neuroscience and Center for Advanced Pain Studies, University of Texas at Dallas, 800 W. Campbell Road, Richardson, Texas 75080, United States
| | - Young Shen
- Young
BioPharma, LLC, 110 Canal
Street, 4th Floor, Lowell, Massachusetts 01852, United States
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Ticona LA, Sánchez ÁR, Estrada CT, Palomino OM. Identification of TRPV1 Ion Channels Agonists of Tropaeolum tuberosum in Human Skin Keratinocytes. PLANTA MEDICA 2021; 87:383-394. [PMID: 33007786 DOI: 10.1055/a-1264-0572] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Tropaeolum tuberosum, commonly known as Mashua, is an herbal remedy used in traditional Andean medicine for the relief of kidney and bladder pain, as well as contusions. This study aimed to evaluate the fractions and isolated compounds from T. tuberosum with analgesic activity mediated by the transient receptor potential vanilloid-1 receptor. A bioguided phytochemical analysis based on NMR/MS was performed to identify the compounds of the n-heptane fractions from samples of purple tubers of T. tuberosum. The transient receptor potential vanilloid-1 agonist and antagonist activity were assessed through the measurement of intracellular Ca2+ in HEK001 cells. The chemical structure determination led to the identification of two alkamides: N-(2-hydroxyethyl)-7Z,10Z,13Z,16Z-docosatetraenamide (1: ) and N-oleoyldopamine (2: ). Both compounds induced increased intracellular calcium flow with IC50 values of 3.2 nM and 7.9 nM, respectively, thus activating the transient receptor potential vanilloid-1 receptor. Our research is the first report to show that these two compounds isolated from T. tuberosum can act as agonists of the transient receptor potential vanilloid-1 receptor, providing scientific evidence for the traditional use of this species in pain relief.
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Affiliation(s)
- Luis Apaza Ticona
- Department of Organic Chemistry, Faculty of Sciences, University Autónoma of Madrid, Madrid, Spain
- Department of Pharmacology, Pharmacognosy and Botany, Faculty of Pharmacy, University Complutense of Madrid, Madrid, Spain
| | - Ángel Rumbero Sánchez
- Department of Organic Chemistry, Faculty of Sciences, University Autónoma of Madrid, Madrid, Spain
| | | | - Olga M Palomino
- Department of Pharmacology, Pharmacognosy and Botany, Faculty of Pharmacy, University Complutense of Madrid, Madrid, Spain
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Laolob T, Bunyapraphatsara N, Waranuch N, Pongcharoen S, Punyain W, Chancharunee S, Sakchaisri K, Pratuangdejkul J, Chongruchiroj S, Kielar F, Wichai U. Enhancement of Lipolysis in 3T3-L1 Adipocytes by Nitroarene Capsaicinoid Analogs. Nat Prod Commun 2021. [DOI: 10.1177/1934578x20987949] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Transient receptor potential vanilloid 1 (TRPV1) activation by capsaicin binding increased intracellular calcium influx and stimulated adipocyte-to-adipocyte communication, leading to lipolysis. Generally, enhancement of π-stacking capabilities improves certain binding interactions. Notably, nitroarenes exhibit strong binding interactions with aromatic amino acid side chains in proteins. New capsaicinoid analogs were designed by substitution of the OCH3 group with a nitrogen dioxide (NO2) group on the vanillyl ring to investigate how π-stacking interactions in capsaicinoid analogs contribute to lipolysis. Capsaicinoid analogs, nitro capsaicin (5), and nitro dihydrocapsaicin (6) were prepared in moderate yields via coupling of a nitroaromatic amine salt and fatty acids. Oil Red O staining and triglyceride assays with 10 µM loading of capsaicin (CAP), dihydrocapsaicin (DHC), 5, and 6 were performed to investigate their effect on lipolysis in 3T3-L1 adipocytes. Both assay results indicated that 5 and 6 decreased lipid accumulation by 13.6% and 14.7%, respectively, and significantly reduced triglyceride content by 26.9% and 28.4%, respectively, in comparison with the control experiment. Furthermore, the decrease in triglyceride content observed in response to nitroarene capsaicinoid analogs was approximately 2-folds higher than that of CAP and DHC. These results arose from the NO2 group augmented π-π stacking with Tyr511 and the attractive charge interaction with Glu570 affecting binding interactions with TRPV1 receptors.
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Affiliation(s)
- Thanet Laolob
- Department of Chemistry, Faculty of Science, Naresuan University, Phitsanulok, Thailand
| | | | - Neti Waranuch
- Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Naresuan University, Phitsanulok, Thailand
| | - Sutatip Pongcharoen
- Department of Medicine, Faculty of Medicine, Naresuan University, Phitsanulok, Thailand
| | - Wikorn Punyain
- Department of Chemistry, Faculty of Science, Naresuan University, Phitsanulok, Thailand
| | - Sirirat Chancharunee
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
| | - Krisada Sakchaisri
- Department of Pharmacology, Faculty of Pharmacy, Mahidol University, Bangkok, Thailand
| | | | - Sumet Chongruchiroj
- Department of Microbiology, Faculty of Pharmacy, Mahidol University, Bangkok, Thailand
| | - Filip Kielar
- Department of Chemistry and Center of Excellence in Biomaterials, Naresuan University, Phitsanulok, Thailand
| | - Uthai Wichai
- Department of Chemistry and Center of Excellence in Biomaterials, Naresuan University, Phitsanulok, Thailand
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7
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Tobita N, Makino M, Fujita R, Jyotaki M, Shinohara Y, Yamamoto T. Sweet scent lactones activate hot capsaicin receptor, TRPV1. Biochem Biophys Res Commun 2020; 534:547-552. [PMID: 33239169 DOI: 10.1016/j.bbrc.2020.11.046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Accepted: 11/12/2020] [Indexed: 12/18/2022]
Abstract
In this study, we investigated the activation of Transient receptor potential vanilloid subtype 1, TRPV1, by lactones, a representative flavor ingredient currently used for foods and beverages. As a result, we found that some lactones having C4 acyl chain length, γ-octalactone, δ-nonalactone and β-methyl-γ-octalactone, γ-undecalactone with C7 acyl chain length and δ-undecalactone with C6 acyl chain length activated TRPV1. TRPV1 is known as a non-selective cation channels that respond to a wide range of physical and chemical stimuli such as high temperature, protons, capsaicin and so on. Furthermore, it has been also demonstrated that activation of TRPV1 induced energy expenditure enhancement and thermogenesis, suppressed accumulation of visceral fat in mice and prevented non-alcoholic fatty acid liver. Thus, lactones that function as TRPV1 agonists are thought to be important candidates for decreasing the risks of developing a metabolic syndrome.
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Affiliation(s)
- Naoya Tobita
- Tobacco Science Research Center, Japan Tobacco Inc, 6-2 Umegaoka, Aoba, Yokohama, Kanagawa, 227-8512, Japan
| | - Masanari Makino
- Tobacco Science Research Center, Japan Tobacco Inc, 6-2 Umegaoka, Aoba, Yokohama, Kanagawa, 227-8512, Japan
| | - Ryujiro Fujita
- Tobacco Science Research Center, Japan Tobacco Inc, 6-2 Umegaoka, Aoba, Yokohama, Kanagawa, 227-8512, Japan
| | - Masafumi Jyotaki
- Tobacco Science Research Center, Japan Tobacco Inc, 6-2 Umegaoka, Aoba, Yokohama, Kanagawa, 227-8512, Japan
| | - Yuhei Shinohara
- Tobacco Science Research Center, Japan Tobacco Inc, 6-2 Umegaoka, Aoba, Yokohama, Kanagawa, 227-8512, Japan
| | - Takeshi Yamamoto
- Tobacco Science Research Center, Japan Tobacco Inc, 6-2 Umegaoka, Aoba, Yokohama, Kanagawa, 227-8512, Japan.
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8
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Kang JM, Kwon SO, Ann J, Blumberg PM, Ha H, Yoo YD, Frank-Foltyn R, Lesch B, Bahrenberg G, Stockhausen H, Christoph T, Lee J. Discovery of 1-(1H-indazol-4-yl)-3-((1-phenyl-1H-pyrazol-5-yl)methyl) ureas as potent and thermoneutral TRPV1 antagonists. Bioorg Med Chem Lett 2020; 30:127548. [PMID: 32931910 DOI: 10.1016/j.bmcl.2020.127548] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 09/03/2020] [Accepted: 09/06/2020] [Indexed: 12/11/2022]
Abstract
A series of 1-indazol-3-(1-phenylpyrazol-5-yl)methyl ureas were investigated as hTRPV1 antagonists. The structure-activity relationship study was conducted systematically for both the indazole A-region and the 3-trifluoromethyl/t-butyl pyrazole C-region to optimize the antagonism toward the activation by capsaicin. Among them, the antagonists 26, 50 and 51 displayed highly potent antagonism with Ki(CAP) = 0.4-0.5 nM. Further, in vivo studies in mice indicated that these derivatives both antagonized capsaicin induced hypothermia, consistent with their in vitro activity, and themselves did not induce hyperthermia. In the formalin model, 51 showed anti-nociceptive activity in a dose-dependent manner.
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Affiliation(s)
- Jin Mi Kang
- Laboratory of Medicinal Chemistry, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Sun Ok Kwon
- Laboratory of Medicinal Chemistry, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Jihyae Ann
- Laboratory of Medicinal Chemistry, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Peter M Blumberg
- Laboratory of Medicinal Chemistry, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Heejin Ha
- Medifron DBT, Seoul 08502, Republic of Korea
| | | | | | - Bernhard Lesch
- Grünenthal Innovation, Grünenthal GmbH, D-52078 Aachen, Germany
| | | | | | | | - Jeewoo Lee
- Laboratory of Medicinal Chemistry, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea.
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A Series of Novel Esters of Capsaicin Analogues Catalyzed by Candida antarctica Lipases. BIOTECHNOL BIOPROC E 2020. [DOI: 10.1007/s12257-019-0290-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Ann J, Kim HS, Thorat SA, Kim H, Ha HJ, Choi K, Kim YH, Kim M, Hwang SW, Pearce LV, Esch TE, Turcios NA, Blumberg PM, Lee J. Discovery of Nonpungent Transient Receptor Potential Vanilloid 1 (TRPV1) Agonist as Strong Topical Analgesic. J Med Chem 2019; 63:418-424. [PMID: 31702924 DOI: 10.1021/acs.jmedchem.9b01046] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Paradoxically, some TRPV1 agonists are, at the organismal level, both nonpungent and clinically useful as topical analgesics. Here, we describe the scaled-up synthesis and characterization in mouse models of a novel, nonpungent vanilloid. Potent analgesic activity was observed in models of neuropathic pain, and the compound blocked capsaicin induced allodynia, showing dermal accumulation with little transdermal absorption. Finally, it displayed much weaker systemic toxicity compared to capsaicin and was negative in assays of genotoxicity.
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Affiliation(s)
- Jihyae Ann
- Laboratory of Medicinal Chemistry, College of Pharmacy , Seoul National University , 1 Gwanak-ro , Gwanak-gu, Seoul 08826 , Republic of Korea
| | - Ho Shin Kim
- Laboratory of Medicinal Chemistry, College of Pharmacy , Seoul National University , 1 Gwanak-ro , Gwanak-gu, Seoul 08826 , Republic of Korea
| | - Shivaji A Thorat
- Laboratory of Medicinal Chemistry, College of Pharmacy , Seoul National University , 1 Gwanak-ro , Gwanak-gu, Seoul 08826 , Republic of Korea
| | - Hee Kim
- Medifron DBT , Sandanro 349 , Danwon-gu, Ansan-si , Gyeonggi-do 15426 , Republic of Korea
| | - Hee-Jin Ha
- Medifron DBT , Sandanro 349 , Danwon-gu, Ansan-si , Gyeonggi-do 15426 , Republic of Korea
| | - Kwanghyun Choi
- Medifron DBT , Sandanro 349 , Danwon-gu, Ansan-si , Gyeonggi-do 15426 , Republic of Korea
| | - Young-Ho Kim
- Medifron DBT , Sandanro 349 , Danwon-gu, Ansan-si , Gyeonggi-do 15426 , Republic of Korea
| | - Minseok Kim
- Department of Biomedical Sciences and Department of Physiology , Korea University College of Medicine , Seoul 02841 , Republic of Korea
| | - Sun Wook Hwang
- Department of Biomedical Sciences and Department of Physiology , Korea University College of Medicine , Seoul 02841 , Republic of Korea
| | - Larry V Pearce
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research , National Cancer Institute, NIH , Bethesda , Maryland 20892-4255 , United States
| | - Timothy E Esch
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research , National Cancer Institute, NIH , Bethesda , Maryland 20892-4255 , United States
| | - Noe A Turcios
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research , National Cancer Institute, NIH , Bethesda , Maryland 20892-4255 , United States
| | - Peter M Blumberg
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research , National Cancer Institute, NIH , Bethesda , Maryland 20892-4255 , United States
| | - Jeewoo Lee
- Laboratory of Medicinal Chemistry, College of Pharmacy , Seoul National University , 1 Gwanak-ro , Gwanak-gu, Seoul 08826 , Republic of Korea
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Pereira GJV, Tavares MT, Azevedo RA, Martins BB, Cunha MR, Bhardwaj R, Cury Y, Zambelli VO, Barbosa EG, Hediger MA, Parise-Filho R. Capsaicin-like analogue induced selective apoptosis in A2058 melanoma cells: Design, synthesis and molecular modeling. Bioorg Med Chem 2019; 27:2893-2904. [PMID: 31104785 DOI: 10.1016/j.bmc.2019.05.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 04/13/2019] [Accepted: 05/12/2019] [Indexed: 01/19/2023]
Abstract
The use of molecules inspired by natural scaffolds has proven to be a very promising and efficient method of drug discovery. In this work, capsaicin, a natural product from Capsicum peppers with antitumor properties, was used as a prototype to obtain urea and thiourea analogues. Among the most promising compounds, the thiourea compound 6g exhibited significant cytotoxic activity against human melanoma A2058 cells that was twice as high as that of capsaicin. Compound 6g induced significant and dose-dependent G0/G1 cell cycle arrest in A2058 cells triggering cell death by apoptosis. Our results suggest that 6g modulates the RAF/MEK/ERK pathway, inducing important morphological changes, such as formation of apoptotic bodies and increased levels of cleaved caspase-3. Compared to capsaicin, 6g had no significant TRPV1/6 agonist effect or irritant effects on mice. Molecular modeling studies corroborate the biological findings and suggest that 6g, besides being a more reactive molecule towards its target, may also present a better pharmacokinetic profile than capsaicin. Inverse virtual screening strategy found MEK1 as a possible biological target for 6g. Consistent with these findings, our observations suggested that 6g could be developed as a potential anticancer agent.
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Affiliation(s)
- Gustavo José Vasco Pereira
- Laboratory of Design and Synthesis of Bioactive Substances (LAPESSB), Department of Pharmacy, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil
| | - Maurício Temotheo Tavares
- Laboratory of Design and Synthesis of Bioactive Substances (LAPESSB), Department of Pharmacy, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil
| | - Ricardo Alexandre Azevedo
- Experimental Oncology Unit (UNONEX), Department of Microbiology, Immunology and Parasitology, Federal University of São Paulo, São Paulo, Brazil
| | | | - Micael Rodrigues Cunha
- Laboratory of Design and Synthesis of Bioactive Substances (LAPESSB), Department of Pharmacy, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil; Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Rajesh Bhardwaj
- Institute of Biochemistry and Molecular Medicine, National Center for Competence in Research, NCCR TransCure, University of Bern, Bühlstrasse 28, 3012 Bern, Switzerland
| | - Yara Cury
- Laboratory of Pain and Signaling, Butantan Institute, São Paulo, Brazil
| | | | | | - Matthias A Hediger
- Institute of Biochemistry and Molecular Medicine, National Center for Competence in Research, NCCR TransCure, University of Bern, Bühlstrasse 28, 3012 Bern, Switzerland
| | - Roberto Parise-Filho
- Laboratory of Design and Synthesis of Bioactive Substances (LAPESSB), Department of Pharmacy, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil.
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Benso B, Bustos D, Zarraga MO, Gonzalez W, Caballero J, Brauchi S. Chalcone derivatives as non-canonical ligands of TRPV1. Int J Biochem Cell Biol 2019; 112:18-23. [PMID: 31026506 DOI: 10.1016/j.biocel.2019.04.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 04/18/2019] [Accepted: 04/22/2019] [Indexed: 10/27/2022]
Abstract
Transient receptor potential vanilloid 1 (TRPV1) is a polymodal cation channel activated by heat, voltage, and ligands. Also known as the capsaicin receptor, TRPV1 is expressed in numerous tissues by different cell types, including peripheral sensory fibers where acts as a thermal and chemical detector in nociceptive pathways. TRPV1 channels are able to bind a wide range of ligands, including a number of vanilloid derivatives all modulating channel's activity. When expressed by sensory neurons, activation of TRPV1 channels by heat (>40 °C), capsaicin (sub-micromolar), or acid environment (pH < 6), causes depolarization leading to burning pain sensation in mammals. Naturally occurring chalcones (1,3-diaryl-2-propen-1-ones) have been reported as effective inhibitors of TRPV1. Their relatively simple chemical structure and the possibility for handy chemical modification make them attractive ligands for the treatment of peripheral pain. By taking advantage of the structural information available, here we discuss pharmacological properties of chalcones and their putative mechanism of binding to TRPV1 channels.
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Affiliation(s)
- Bruna Benso
- School of Dentistry, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, RM, Chile; Department of Physiology, Faculty of Medicine, Universidad Austral de Chile, Valdivia, Chile; Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD), Valdivia, Chile
| | - Daniel Bustos
- Center for Bioinformatics and Molecular Simulation (CBSM), Universidad de Talca, Talca, Chile
| | - Miguel O Zarraga
- Department of Organic Chemistry, Faculty of Chemical Sciences, Universidad de Concepcion, Concepcion, Chile
| | - Wendy Gonzalez
- Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD), Valdivia, Chile; Center for Bioinformatics and Molecular Simulation (CBSM), Universidad de Talca, Talca, Chile
| | - Julio Caballero
- Center for Bioinformatics and Molecular Simulation (CBSM), Universidad de Talca, Talca, Chile
| | - Sebastian Brauchi
- Department of Physiology, Faculty of Medicine, Universidad Austral de Chile, Valdivia, Chile; Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD), Valdivia, Chile.
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Tsuchiya Y, Kawamata K. [6]-Gingerol Induces Amiloride-Sensitive Sodium Absorption in the Rat Colon via the Capsaicin Receptor TRPV1 in Colonic Mucosa. J Nutr Sci Vitaminol (Tokyo) 2018; 64:287-291. [PMID: 30175793 DOI: 10.3177/jnsv.64.287] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
[6]-Gingerol possesses various beneficial pharmacological and therapeutic properties, including anti-carcinogenic and anti-inflammatory properties and the ability to regulate intestinal contraction. Recently, our group observed that the serosal administration of [6]-gingerol stimulated electrogenic sodium absorption in the rat colon via the capsaicin receptor, TRPV1. TRPV1 is known to be expressed in both the mucosal epithelium and the muscle layers in the colon. In the present study, we assessed whether [6]-gingerol stimulated sodium absorption via TRPV1 in the colonic mucosal epithelium. We compared the effect of [6]-gingerol on TRPV1-dependent colonic sodium absorption in the colon preparation with or without muscle layer. All experiments were performed by measuring the transmural potential difference (ΔPD) in an Ussing chamber system. [6]-Gingerol induced positive ΔPD when administered to the serosal side of the colon, and this effect was significantly larger in the colon preparation without muscle layer than in that with the muscle layer. In the colon preparation without muscle layer, the [6]-gingerol-dependent induction of ΔPD was markedly suppressed by mucosal addition of amiloride, a selective inhibitor of epithelial sodium channel. ΔPD induction by [6]-gingerol was considerably diminished by capsazepine, an inhibitor of the capsaicin receptor TRPV1, but not by AP-18, an inhibitor of TRPA1. These results suggest that [6]-gingerol induces amiloride-sensitive electrogenic sodium absorption in the rat colon via TRPV1 expressed in the colonic mucosal epithelium, and that this effect is independent of TRPV1 in the colonic muscle layer.
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Affiliation(s)
- Yo Tsuchiya
- Department of Health and Nutrition, Faculty of Home Economics, Tohoku Women's College
| | - Koichi Kawamata
- Department of Domestic Science, Faculty of Domestic Science, Tohoku Seikatsu Bunka University
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14
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Serafini M, Griglio A, Aprile S, Seiti F, Travelli C, Pattarino F, Grosa G, Sorba G, Genazzani AA, Gonzalez-Rodriguez S, Butron L, Devesa I, Fernandez-Carvajal A, Pirali T, Ferrer-Montiel A. Targeting Transient Receptor Potential Vanilloid 1 (TRPV1) Channel Softly: The Discovery of Passerini Adducts as a Topical Treatment for Inflammatory Skin Disorders. J Med Chem 2018; 61:4436-4455. [DOI: 10.1021/acs.jmedchem.8b00109] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Marta Serafini
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Alessia Griglio
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Silvio Aprile
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Fabio Seiti
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Cristina Travelli
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Franco Pattarino
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Giorgio Grosa
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Giovanni Sorba
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Armando A. Genazzani
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Sara Gonzalez-Rodriguez
- Instituto de Biología Molecular y Celular, Universitas Miguel Hernandez, Av de la Universidad s/n, 03202 Elche, Spain
| | - Laura Butron
- Instituto de Biología Molecular y Celular, Universitas Miguel Hernandez, Av de la Universidad s/n, 03202 Elche, Spain
| | - Isabel Devesa
- AntalGenics, SL. Ed. Quorum III, Parque
Científico UMH, Av de la Universidad s/n, 03202 Elche, Spain
| | - Asia Fernandez-Carvajal
- Instituto de Biología Molecular y Celular, Universitas Miguel Hernandez, Av de la Universidad s/n, 03202 Elche, Spain
| | - Tracey Pirali
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Antonio Ferrer-Montiel
- Instituto de Biología Molecular y Celular, Universitas Miguel Hernandez, Av de la Universidad s/n, 03202 Elche, Spain
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Bioactive Oleic Derivatives of Dopamine: A Review of the Therapeutic Potential. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018. [PMID: 29623573 DOI: 10.1007/5584_2018_197] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Lipid derivatives of dopamine are a novel class of compounds raising a research interest due to the potential of their being a vehicle for dopamine delivery to the brain. The aim of the present paper is to review the main features of the two most prominent bioactive members of this family, namely, N-oleoyl-dopamine (OLDA) and 3'-O-methyl-N-oleoyl-dopamine (OMe-OLDA), with emphasis on the possible therapeutic properties.
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16
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Pallavi P, Pretze M, Caballero J, Li Y, Hofmann BB, Stamellou E, Klotz S, Wängler C, Wängler B, Loesel R, Roth S, Theisinger B, Moerz H, Binzen U, Greffrath W, Treede RD, Harmsen MC, Krämer BK, Hafner M, Yard BA, Kälsch AI. Analyses of Synthetic N-Acyl Dopamine Derivatives Revealing Different Structural Requirements for Their Anti-inflammatory and Transient-Receptor-Potential-Channel-of-the-Vanilloid-Receptor-Subfamily-Subtype-1 (TRPV1)-Activating Properties. J Med Chem 2018. [PMID: 29543451 DOI: 10.1021/acs.jmedchem.8b00156] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We studied the chemical entities within N-octanoyl dopamine (NOD) responsible for the activation of transient-receptor-potential channels of the vanilloid-receptor subtype 1 (TRPV1) and inhibition of inflammation. The potency of NOD in activating TRPV1 was significantly higher compared with those of variants in which the ortho-dihydroxy groups were acetylated, one of the hydroxy groups was omitted ( N-octanoyl tyramine), or the ester functionality consisted of a bulky fatty acid ( N-pivaloyl dopamine). Shortening of the amide linker (ΔNOD) slightly increased its potency, which was further increased when the carbonyl and amide groups (ΔNODR) were interchanged. With the exception of ΔNOD, the presence of an intact catechol structure was obligatory for the inhibition of VCAM-1 and the induction of HO-1 expression. Because TRPV1 activation and the inhibition of inflammation by N-acyl dopamines require different structural entities, our findings provide a framework for the rational design of TRPV1 agonists with improved anti-inflammatory properties.
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Affiliation(s)
- Prama Pallavi
- Institute for Molecular and Cellular Biology , Mannheim University of Applied Sciences , Mannheim 68163 , Germany
| | | | - Julio Caballero
- Center for Bioinformatics and Molecular Simulations, Faculty of Engineering in Bioinformatics , Universidad de Talca , Talca 3460000 , Chile
| | | | | | | | | | | | | | - Ralf Loesel
- Department of Applied Chemistry , Technical University of Applied Sciences , Nuremberg 90489 , Germany
| | - Steffen Roth
- Department of Applied Chemistry , Technical University of Applied Sciences , Nuremberg 90489 , Germany
| | | | | | | | | | | | - Martin C Harmsen
- Department of Pathology and Medical Biology, University Medical Centre Groningen , University of Groningen , Groningen 9713 , The Netherlands
| | | | - Mathias Hafner
- Institute for Molecular and Cellular Biology , Mannheim University of Applied Sciences , Mannheim 68163 , Germany
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17
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Factors affecting the uncaging efficiency of 500 nm light-activatable BODIPY caging group. Bioorg Med Chem Lett 2018; 28:1-5. [DOI: 10.1016/j.bmcl.2017.11.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 11/15/2017] [Indexed: 12/20/2022]
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18
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Pearce LV, Ann J, Jung A, Thorat SA, Herold BKA, Habtemichael AD, Blumberg PM, Lee J. Novel Radiolabeled Vanilloid with Enhanced Specificity for Human Transient Receptor Potential Vanilloid 1 (TRPV1). J Med Chem 2017; 60:8246-8252. [PMID: 28892388 DOI: 10.1021/acs.jmedchem.7b00859] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Transient receptor potential vanilloid 1 (TRPV1) has emerged as a promising therapeutic target. While radiolabeled resiniferatoxin (RTX) has provided a powerful tool for characterization of vanilloid binding to TRPV1, TRPV1 shows 20-fold weaker binding to the human TRPV1 than to the rodent TRPV1. We now describe a tritium radiolabeled synthetic vanilloid antagonist, 1-((2-(4-(methyl-[3H])piperidin-1-yl-4-[3H])-6-(trifluoromethyl)pyridin-3-yl)methyl)-3-(3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazin-8-yl)urea ([3H]MPOU), that embodies improved absolute affinity for human TRPV1 and improved synthetic accessibility.
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Affiliation(s)
- Larry V Pearce
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH , Bethesda, Maryland 20892-4255, United States
| | - Jihyae Ann
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University , Seoul 08826, Republic of Korea
| | - Aeran Jung
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University , Seoul 08826, Republic of Korea
| | - Shivaji A Thorat
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University , Seoul 08826, Republic of Korea
| | - Brienna K A Herold
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH , Bethesda, Maryland 20892-4255, United States
| | - Amelework D Habtemichael
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH , Bethesda, Maryland 20892-4255, United States
| | - Peter M Blumberg
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH , Bethesda, Maryland 20892-4255, United States
| | - Jeewoo Lee
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University , Seoul 08826, Republic of Korea
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19
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Pickering G, Martin E, Tiberghien F, Delorme C, Mick G. Localized neuropathic pain: an expert consensus on local treatments. Drug Des Devel Ther 2017; 11:2709-2718. [PMID: 29066862 PMCID: PMC5604568 DOI: 10.2147/dddt.s142630] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Pain localization is one of the hallmarks for the choice of first-line treatment in neuropathic pain. This literature review has been conducted to provide an overview of the current knowledge regarding the etiology and pathophysiology of localized neuropathic pain (LNP), its assessment and the existing topical pharmacological treatments. MATERIALS AND METHODS Literature review was performed using Medline from 2010 to December 2016, and all studies involving LNP and treatments were examined. A multidisciplinary expert panel of five pain specialists in this article reports a consensus on topical approaches that may be recommended to alleviate LNP and on their advantages in clinical practice. RESULTS Successive international recommendations have included topical 5% lidocaine and 8% capsaicin for LNP treatment. The expert panel considers that these compounds can be a first-line treatment for LNP, especially in elderly patients and patients with comorbidities and polypharmacy. Regulatory LNP indications should cover the whole range of LNP and not be restricted to specific etiologies or sites. Precautions for the use of plasters must be followed cautiously. CONCLUSION Although there is a real need for more randomized controlled trials for both drugs, publications clearly demonstrate excellent risk/benefit ratios, safety, tolerance and continued efficacy throughout long-term treatment. A major advantage of both plasters is that they have proven efficacy and may reduce the risk of adverse events such as cognitive impairment, confusion, somnolence, dizziness and constipation that are often associated with systemic neuropathic pain treatment and reduce the quality of life. Topical modalities also may be used in combination with other drugs and analgesics with limited drug-drug interactions.
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Affiliation(s)
- Gisèle Pickering
- Centre de Pharmacologie Clinique, CHU Clermont-Ferrand
- Inserm, CIC 1405, Neurodol 1107
- Laboratoire de Pharmacologie, Faculté de Médecine, Clermont Université, Clermont-Ferrand
| | - Elodie Martin
- Centre de Pharmacologie Clinique, CHU Clermont-Ferrand
- Laboratoire de Pharmacologie, Faculté de Médecine, Clermont Université, Clermont-Ferrand
| | - Florence Tiberghien
- Centre d’Evaluation et de Traitement de la Douleur, CHU Jean Minjoz, Besançon
| | | | - Gérard Mick
- Unité d’Evaluation et Traitement de la Douleur, Voiron
- Laboratoire AGEIS, Université Grenoble Alpes, Grenoble, France
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20
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Basith S, Cui M, Hong S, Choi S. Harnessing the Therapeutic Potential of Capsaicin and Its Analogues in Pain and Other Diseases. Molecules 2016; 21:molecules21080966. [PMID: 27455231 PMCID: PMC6272969 DOI: 10.3390/molecules21080966] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 06/27/2016] [Accepted: 07/15/2016] [Indexed: 12/14/2022] Open
Abstract
Capsaicin is the most predominant and naturally occurring alkamide found in Capsicum fruits. Since its discovery in the 19th century, the therapeutic roles of capsaicin have been well characterized. The potential applications of capsaicin range from food flavorings to therapeutics. Indeed, capsaicin and few of its analogues have featured in clinical research covered by more than a thousand patents. Previous records suggest pleiotropic pharmacological activities of capsaicin such as an analgesic, anti-obesity, anti-pruritic, anti-inflammatory, anti-apoptotic, anti-cancer, anti-oxidant, and neuro-protective functions. Moreover, emerging data indicate its clinical significance in treating vascular-related diseases, metabolic syndrome, and gastro-protective effects. The dearth of potent drugs for management of such disorders necessitates the urge for further research into the pharmacological aspects of capsaicin. This review summarizes the historical background, source, structure and analogues of capsaicin, and capsaicin-triggered TRPV1 signaling and desensitization processes. In particular, we will focus on the therapeutic roles of capsaicin and its analogues in both normal and pathophysiological conditions.
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Affiliation(s)
- Shaherin Basith
- National Leading Research Laboratory (NLRL) of Molecular Modeling & Drug Design, College of Pharmacy and Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 03760, Korea.
| | - Minghua Cui
- National Leading Research Laboratory (NLRL) of Molecular Modeling & Drug Design, College of Pharmacy and Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 03760, Korea.
| | - Sunhye Hong
- National Leading Research Laboratory (NLRL) of Molecular Modeling & Drug Design, College of Pharmacy and Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 03760, Korea.
| | - Sun Choi
- National Leading Research Laboratory (NLRL) of Molecular Modeling & Drug Design, College of Pharmacy and Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 03760, Korea.
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21
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Ann J, Sun W, Zhou X, Jung A, Baek J, Lee S, Kim C, Yoon S, Hong S, Choi S, Turcios NA, Herold BKA, Esch TE, Lewin NE, Abramovitz A, Pearce LV, Blumberg PM, Lee J. Discovery of N-(3-fluoro-4-methylsulfonamidomethylphenyl)urea as a potent TRPV1 antagonistic template. Bioorg Med Chem Lett 2016; 26:3603-7. [PMID: 27317643 DOI: 10.1016/j.bmcl.2016.06.010] [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] [Received: 05/02/2016] [Revised: 06/02/2016] [Accepted: 06/06/2016] [Indexed: 12/21/2022]
Abstract
A series of homologous analogues of prototype antagonist 1 and its urea surrogate were investigated as hTRPV1 ligands. Through one-carbon elongation in the respective pharmacophoric regions, N-(3-fluoro-4-methylsulfonamidomethylphenyl)urea was identified as a novel and potent TRPV1 antagonistic template. Its representative compound 27 showed a potency comparable to that of lead compound 1. Docking analysis of compound 27 in our hTRPV1 homology model indicated that its binding mode was similar with that of 1S.
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Affiliation(s)
- Jihyae Ann
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Wei Sun
- Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Xing Zhou
- Hainan Institute of Materia Medica, Haikou 570311, China
| | - Aeran Jung
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Jisoo Baek
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Sunho Lee
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Changhoon Kim
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Suyoung Yoon
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Sunhye Hong
- National Leading Research Laboratory of Molecular Modeling & Drug Design, College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Sun Choi
- National Leading Research Laboratory of Molecular Modeling & Drug Design, College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Noe A Turcios
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Brienna K A Herold
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Timothy E Esch
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Nancy E Lewin
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Adelle Abramovitz
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Larry V Pearce
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Peter M Blumberg
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Jeewoo Lee
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea.
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22
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Ann J, Ki Y, Yoon S, Kim MS, Lee JU, Kim C, Lee S, Jung A, Baek J, Hong S, Choi S, Pearce LV, Esch TE, Turcios NA, Lewin NE, Ogunjirin AE, Herold BKA, McCall AK, Blumberg PM, Lee J. 2-Sulfonamidopyridine C-region analogs of 2-(3-fluoro-4-methylsulfonamidophenyl)propanamides as potent TRPV1 antagonists. Bioorg Med Chem 2016; 24:1231-40. [PMID: 26860926 PMCID: PMC6957252 DOI: 10.1016/j.bmc.2016.01.051] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Revised: 01/25/2016] [Accepted: 01/27/2016] [Indexed: 12/30/2022]
Abstract
A series of 2-sulfonamidopyridine C-region derivatives of 2-(3-fluoro-4-methylsulfonamidophenyl)propanamide were investigated as hTRPV1 ligands. Systematic modification on the 2-sulfonamido group provided highly potent TRPV1 antagonists. The N-benzyl phenylsulfonamide derivatives 12 and 23 in particular showed higher affinities than that of lead compound 1. Compound 12 exhibited strong analgesic activity in the formalin pain model. Docking analysis of its chiral S-form 12S in our hTRPV1 homology model indicated that its high affinity might arise from additional hydrophobic interactions not present in lead compound 1S.
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Affiliation(s)
- Jihyae Ann
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Yooran Ki
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Suyoung Yoon
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Myeong Seop Kim
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Jung-Un Lee
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Changhoon Kim
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Sunho Lee
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Aeran Jung
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Jisoo Baek
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Sunhye Hong
- National Leading Research Laboratory of Molecular Modeling & Drug Design, College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Sun Choi
- National Leading Research Laboratory of Molecular Modeling & Drug Design, College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Larry V Pearce
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Timothy E Esch
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Noe A Turcios
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Nancy E Lewin
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Adebowale E Ogunjirin
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Brienna K A Herold
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Anna K McCall
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Peter M Blumberg
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Jeewoo Lee
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea.
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23
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The Effect of Capsaicin Derivatives on Tight-Junction Integrity and Permeability of Madin-Darby Canine Kidney Cells. J Pharm Sci 2016; 105:630-638. [PMID: 26869424 DOI: 10.1016/j.xphs.2015.10.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 10/16/2015] [Accepted: 10/19/2015] [Indexed: 12/14/2022]
Abstract
Capsaicin is known to interfere with tight junctions (TJs) of epithelial cells and therefore to enhance paracellular permeability of poorly absorbable drugs. However, due to its low water solubility, pungency, and cytotoxicity, its pharmacologic use is limited. In this study, we investigated the effect of capsaicin derivatives of synthetic (e.g., 10-hydroxy-N-(4-hydroxy-3-methoxybenzyl)decanamide, etc.) and natural (olvanil and dihydrocapsaicin) origin on Madin-Darby Canine Kidney-C7 cells. Impedance spectroscopy was used to determine the transepithelial electrical resistance and the capacitance. Permeability assays with fluorescein isothiocyanate-dextran were carried out to evaluate the impact on cell permeability. The results show that lipophilicity could play an important role for the interference with TJ and that the mechanism is independent from the ion channel TRPV-1 and hence on the flux of calcium into the cells. In summary, we synthesized 4 derivatives of capsaicin of lower lipophilicity and compared their properties with other well-known vanilloids. We show that these compounds are able to enhance the permeability of a hydrophilic macromolecule, by opening the TJ for a shorter time than capsaicin. This behavior is dependent on the lipophilicity of the molecule. Understanding of these phenomena may lead to better control of administration of therapeutic molecules.
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24
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Fernandes ES, Cerqueira ARA, Soares AG, Costa SKP. Capsaicin and Its Role in Chronic Diseases. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2016; 929:91-125. [PMID: 27771922 DOI: 10.1007/978-3-319-41342-6_5] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A significant number of experimental and clinical studies published in peer-reviewed journals have demonstrated promising pharmacological properties of capsaicin in relieving signs and symptoms of non-communicable diseases (chronic diseases). This chapter provides an overview made from basic and clinical research studies of the potential therapeutic effects of capsaicin, loaded in different application forms, such as solution and cream, on chronic diseases (e.g. arthritis, chronic pain, functional gastrointestinal disorders and cancer). In addition to the anti-inflammatory and analgesic properties of capsaicin largely recognized via, mainly, interaction with the TRPV1, the effects of capsaicin on different cell signalling pathways will be further discussed here. The analgesic, anti-inflammatory or apoptotic effects of capsaicin show promising results in arthritis, neuropathic pain, gastrointestinal disorders or cancer, since evidence demonstrates that the oral or local application of capsaicin reduce inflammation and pain in rheumatoid arthritis, promotes gastric protection against ulcer and induces apoptosis of the tumour cells. Sadly, these results have been paralleled by conflicting studies, which indicate that high concentrations of capsaicin are likely to evoke deleterious effects, thus suggesting that capsaicin activates different pathways at different concentrations in both human and rodent tissues. Thus, to establish effective capsaicin doses for chronic conditions, which can be benefited from capsaicin therapeutic effects, is a real challenge that must be pursued.
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Affiliation(s)
- E S Fernandes
- Programa de Pós-Graduação, Universidade Ceuma, São Luís-MA, Brazil.,Vascular Biology Section, Cardiovascular Division, King's College London, London, UK
| | - A R A Cerqueira
- Department of Pharmacology, Institute of Biomedical Sciences (ICB), University of São Paulo (USP), Av. Prof. Lineu Prestes, 1524 - Room 326, Butantan, São Paulo, 05508-900, Sao Paulo, Brazil
| | - A G Soares
- Department of Pharmacology, Institute of Biomedical Sciences (ICB), University of São Paulo (USP), Av. Prof. Lineu Prestes, 1524 - Room 326, Butantan, São Paulo, 05508-900, Sao Paulo, Brazil
| | - Soraia K P Costa
- Department of Pharmacology, Institute of Biomedical Sciences (ICB), University of São Paulo (USP), Av. Prof. Lineu Prestes, 1524 - Room 326, Butantan, São Paulo, 05508-900, Sao Paulo, Brazil.
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25
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Ann J, Jung A, Kim MY, Kim HM, Ryu H, Kim S, Kang DW, Hong S, Cui M, Choi S, Blumberg PM, Frank-Foltyn R, Bahrenberg G, Stockhausen H, Christoph T, Lee J. Structure activity relationships of benzyl C-region analogs of 2-(3-fluoro-4-methylsulfonamidophenyl)propanamides as potent TRPV1 antagonists. Bioorg Med Chem 2015; 23:6844-54. [PMID: 26474664 DOI: 10.1016/j.bmc.2015.10.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Revised: 09/30/2015] [Accepted: 10/01/2015] [Indexed: 01/15/2023]
Abstract
A series of 2-substituted 4-(trifluoromethyl)benzyl C-region analogs of 2-(3-fluoro-4-methylsulfonamidophenyl)propanamides were investigated for hTRPV1 antagonism. The analysis indicated that the phenyl C-region derivatives exhibited better antagonism than those of the corresponding pyridine surrogates for most of the series examined. Among the phenyl C-region derivatives, the two best compounds 43 and 44S antagonized capsaicin selectively relative to their antagonism of other activators and showed excellent potencies with K(i(CAP))=0.3 nM. These two compounds blocked capsaicin-induced hypothermia, consistent with TRPV1 as their site of action, and they demonstrated promising analgesic activities in a neuropathic pain model without hyperthermia. The docking study of 44S in our hTRPV1 homology model indicated that its binding mode was similar with that of its pyridine surrogate in the A- and B-regions but displayed a flipped configuration in the C-region.
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Affiliation(s)
- Jihyae Ann
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Aeran Jung
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Mi-Yeon Kim
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Hyuk-Min Kim
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - HyungChul Ryu
- J2H Biotech, Ansan-si, Gyeonggi-do, Republic of Korea
| | - Sunjoo Kim
- J2H Biotech, Ansan-si, Gyeonggi-do, Republic of Korea
| | - Dong Wook Kang
- Department of Pharmaceutical Science and Technology, College of Health and Medical Science, Catholic University of Deagu, Gyeongsan-si, Gyeongsangbuk-do 712-702, Republic of Korea
| | - Sunhye Hong
- National Leading Research Laboratory of Molecular Modeling & Drug Design, College of Pharmacy, Graduate School of Pharmaceutical Sciences, and Global Top 5 Research Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Minghua Cui
- National Leading Research Laboratory of Molecular Modeling & Drug Design, College of Pharmacy, Graduate School of Pharmaceutical Sciences, and Global Top 5 Research Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Sun Choi
- National Leading Research Laboratory of Molecular Modeling & Drug Design, College of Pharmacy, Graduate School of Pharmaceutical Sciences, and Global Top 5 Research Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Peter M Blumberg
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | | | | | | | | | - Jeewoo Lee
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea.
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26
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Ferreira AK, Tavares MT, Pasqualoto KFM, de Azevedo RA, Teixeira SF, Ferreira-Junior WA, Bertin AM, de-Sá-Junior PL, Barbuto JAM, Figueiredo CR, Cury Y, Damião MCFCB, Parise-Filho R. RPF151, a novel capsaicin-like analogue: in vitro studies and in vivo preclinical antitumor evaluation in a breast cancer model. Tumour Biol 2015; 36:7251-67. [DOI: 10.1007/s13277-015-3441-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 02/11/2015] [Indexed: 12/01/2022] Open
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27
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Tran PT, Kim HS, Ann J, Kim SE, Kim C, Hong M, Hoang VH, Ngo VTH, Hong S, Cui M, Choi S, Blumberg PM, Frank-Foltyn R, Bahrenberg G, Stockhausen H, Christoph T, Lee J. α-Substituted 2-(3-fluoro-4-methylsulfonamidophenyl)acetamides as potent TRPV1 antagonists. Bioorg Med Chem Lett 2015; 25:2326-30. [PMID: 25937016 DOI: 10.1016/j.bmcl.2015.04.024] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Revised: 04/03/2015] [Accepted: 04/08/2015] [Indexed: 02/01/2023]
Abstract
A series of α-substituted acetamide derivatives of previously reported 2-(3-fluoro-4-methylsulfonamidophenyl)propanamide leads (1, 2) were investigated for antagonism of hTRPV1 activation by capsaicin. Compound 34, which possesses an α-m-tolyl substituent, showed highly potent and selective antagonism of capsaicin with Ki(CAP)=0.1 nM. It thus reflected a 3-fold improvement in potency over parent 1. Docking analysis using our homology model indicated that the high potency of 34 might be attributed to a specific hydrophobic interaction of the m-tolyl group with the receptor.
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Affiliation(s)
- Phuong-Thao Tran
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Ho Shin Kim
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Jihyae Ann
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Sung-Eun Kim
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Changhoon Kim
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Mannkyu Hong
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Van-Hai Hoang
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Van T H Ngo
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Sunhye Hong
- National Leading Research Laboratory of Molecular Modeling & Drug Design, College of Pharmacy, Graduate School of Pharmaceutical Sciences, and Global Top 5 Research Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Minghua Cui
- National Leading Research Laboratory of Molecular Modeling & Drug Design, College of Pharmacy, Graduate School of Pharmaceutical Sciences, and Global Top 5 Research Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Sun Choi
- National Leading Research Laboratory of Molecular Modeling & Drug Design, College of Pharmacy, Graduate School of Pharmaceutical Sciences, and Global Top 5 Research Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Peter M Blumberg
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | | | | | | | | | - Jeewoo Lee
- Laboratory of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea.
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28
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Yang J, Johnson BJ, Letourneau AA, Vogels CM, Decken A, Baerlocher FJ, Westcott SA. Synthesis, Characterisation, and Antifungal Activities of Novel Benzodiazaborines. Aust J Chem 2015. [DOI: 10.1071/ch14534] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Eight new fluoro- and methoxy-substituted benzodiazaborines have been prepared by a simple condensation reaction in high-to-excellent yields. All new compounds have been characterised by several physical methods, including X-ray diffraction studies on three examples. All new compounds were examined for antifungal activities against five species of potentially pathogenic fungi (Aspergillus niger, Aspergillus fumigatus, Rhizoctonia solani, Verticillium albo-atrum, and Verticillium dahliae). While substitution of the aromatic group derived from the 2-formylphenylboronic acid group had an effect on bioactivities, substitution on the parent thioamide C(=S)NH2 group of the starting thiosemicarbazide greatly reduced activities.
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29
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Zingiber officinale (Ginger): A Future Outlook on Its Potential in Prevention and Treatment of Diabetes and Prediabetic States. ACTA ACUST UNITED AC 2014. [DOI: 10.1155/2014/674684] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Diabetes is reaching pandemic levels in both developing and developed countries and requires safe, affordable, and effective therapies. This report summarises work in our laboratory on the effects of Zingiber officinale (ginger) and its components in diabetes models and provides a future outlook on the potential for their use in type 2 diabetes. A high fat diet rat model showed modulation of body weight gain and normalisation of glucose and lipid metabolic disturbances, with reduction of insulin resistance in a high fat-high carbohydrate diet model. Ginger extract inhibits enhanced NF-κB in liver of high fat-fed rats through inhibition of the IKK/IκBα/NF-κB classical pathway. The major active component (S)-[6]-gingerol inhibited elevated cytokines in inflamed HuH7 cells through suppression of COX2 expression and protection against the ROS pathway. Ginger extract and gingerols enhanced glucose uptake in L6 myotubes, by enhancing translocation of GLUT4 to the surface membrane and activation of AMPKα1 through a Ca2+/calmodulin-dependent protein kinase kinase pathway. (S)-[6]-Gingerol also enhanced energy metabolism through marked increment of peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α) gene expression and mitochondrial content in L6 skeletal muscle cells. Future studies will require well designed clinical trials on ginger preparations of defined chemical composition.
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30
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Steinberg X, Lespay-Rebolledo C, Brauchi S. A structural view of ligand-dependent activation in thermoTRP channels. Front Physiol 2014; 5:171. [PMID: 24847275 PMCID: PMC4017155 DOI: 10.3389/fphys.2014.00171] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Accepted: 04/11/2014] [Indexed: 11/26/2022] Open
Abstract
Transient Receptor Potential (TRP) proteins are a large family of ion channels, grouped into seven sub-families. Although great advances have been made regarding the activation and modulation of TRP channel activity, detailed molecular mechanisms governing TRP channel gating are still needed. Sensitive to electric, chemical, mechanical, and thermal cues, TRP channels are tightly associated with the detection and integration of sensory input, emerging as a model to study the polymodal activation of ion channel proteins. Among TRP channels, the temperature-activated kind constitute a subgroup by itself, formed by Vanilloid receptors 1–4, Melastatin receptors 2, 4, 5, and 8, TRPC5, and TRPA1. Some of the so-called “thermoTRP” channels participate in the detection of noxious stimuli making them an interesting pharmacological target for the treatment of pain. However, the poor specificity of the compounds available in the market represents an important obstacle to overcome. Understanding the molecular mechanics underlying ligand-dependent modulation of TRP channels may help with the rational design of novel synthetic analgesics. The present review focuses on the structural basis of ligand-dependent activation of TRPV1 and TRPM8 channels. Special attention is drawn to the dissection of ligand-binding sites within TRPV1, PIP2-dependent modulation of TRP channels, and the structure of natural and synthetic ligands.
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Affiliation(s)
- Ximena Steinberg
- Faculty of Medicine, Institute of Physiology, Universidad Austral de Chile Campus Isla Teja, Valdivia, Chile ; Faculty of Sciences, Graduate School, Universidad Austral de Chile Campus Isla Teja, Valdivia, Chile
| | - Carolyne Lespay-Rebolledo
- Faculty of Chemical and Pharmaceutical Sciences, Graduate School, Universidad de Chile Santiago, Chile
| | - Sebastian Brauchi
- Faculty of Medicine, Institute of Physiology, Universidad Austral de Chile Campus Isla Teja, Valdivia, Chile
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31
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Constrained TRPV1 agonists synthesized via silver-mediated intramolecular azo-methine ylide cycloaddition of α-iminoamides. Bioorg Med Chem Lett 2014; 24:963-8. [PMID: 24412067 DOI: 10.1016/j.bmcl.2013.12.061] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2013] [Revised: 12/12/2013] [Accepted: 12/16/2013] [Indexed: 12/16/2022]
Abstract
As part of an effort to identify agonists of TRPV1, a peripheral sensory nerve ion channel, high throughput screening of the NIH Small Molecule Repository (SMR) collection identified MLS002174161, a pentacyclic benzodiazepine. A synthesis effort was initiated that ultimately afforded racemic seco analogs 12 of the SMR compound via a silver mediated intramolecular [3+2] cycloaddition of an azo-methine ylide generated from α-iminoamides 11. The cycloaddition set four contiguous stereocenters and, in some cases, also spontaneously afforded imides 13 from 12. The synthesis of compounds 12, the features that facilitated the conversion of 12-13, and their partial agonist activity against TRPV1 are discussed.
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32
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Zajac D, Spolnik G, Roszkowski P, Danikiewicz W, Czarnocki Z, Pokorski M. Metabolism of N-acylated-dopamine. PLoS One 2014; 9:e85259. [PMID: 24465516 PMCID: PMC3899008 DOI: 10.1371/journal.pone.0085259] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Accepted: 11/25/2013] [Indexed: 11/30/2022] Open
Abstract
N-oleoyl-dopamine (OLDA) is a novel lipid derivative of dopamine. Its biological action includes the interaction with dopamine and the transient receptor potential vanilloid (TRPV1) receptors. It seems to be synthesized in a dopamine-like manner, but there has been no information on its degradation. The aim of the study was, therefore, to determine whether OLDA metabolism proceeds the way dopamine proper does. We addressed the issue by examining the occurrence of O-methylation of exogenously supplemented OLDA via catechol-O-methyltransferase (COMT) under in vitro, ex vivo, and in vivo conditions using rat brain tissue. The results show that OLDA was methylated by COMT in all conditions studied, yielding the O-methylated derivative. The methylation was reversed by tolcapone, a potent COMT inhibitor, in a dose-dependent manner. We conclude that OLDA enters the metabolic pathway of dopamine. Methylation of OLDA may enhance its bioactive properties, such as the ability to interact with TRPV1 receptors.
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Affiliation(s)
- Dominika Zajac
- Department of Respiratory Research, Medical Research Center, Polish Academy of Sciences, Warsaw, Poland
| | - Grzegorz Spolnik
- Mass Spectrometry - Group One, Institute of Organic Chemistry, Polish Academy of Sciences, Warsaw, Poland
| | - Piotr Roszkowski
- Laboratory of Natural Products Chemistry, Faculty of Chemistry, Warsaw University, Warsaw, Poland
| | - Witold Danikiewicz
- Mass Spectrometry - Group One, Institute of Organic Chemistry, Polish Academy of Sciences, Warsaw, Poland
| | - Zbigniew Czarnocki
- Laboratory of Natural Products Chemistry, Faculty of Chemistry, Warsaw University, Warsaw, Poland
| | - Mieczyslaw Pokorski
- Department of Respiratory Research, Medical Research Center, Polish Academy of Sciences, Warsaw, Poland
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33
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TSUCHIYA Y, FUJITA R, SAITOU A, WAJIMA N, AIZAWA F, IINUMA A. [6]-Gingerol Induces Electrogenic Sodium Absorption in the Rat Colon via the Capsaicin Receptor TRPV1. J Nutr Sci Vitaminol (Tokyo) 2014; 60:403-7. [DOI: 10.3177/jnsv.60.403] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Yo TSUCHIYA
- Department of Living Science, Faculty of Home Economics, Tohoku Women’s College
| | - Rina FUJITA
- Department of Living Science, Faculty of Home Economics, Tohoku Women’s College
| | - Akae SAITOU
- Department of Living Science, Faculty of Home Economics, Tohoku Women’s College
| | - Nanako WAJIMA
- Department of Living Science, Faculty of Home Economics, Tohoku Women’s College
| | - Fuyuka AIZAWA
- Department of Living Science, Faculty of Home Economics, Tohoku Women’s College
| | - Akane IINUMA
- Department of Living Science, Faculty of Home Economics, Tohoku Women’s College
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34
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35
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36
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Identification of a Calcium Signalling Pathway of S-[6]-Gingerol in HuH-7 Cells. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2013:951758. [PMID: 23956783 PMCID: PMC3730182 DOI: 10.1155/2013/951758] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Revised: 06/28/2013] [Accepted: 06/28/2013] [Indexed: 12/05/2022]
Abstract
Calcium signals in hepatocytes control cell growth, proliferation, and death. Members of the transient receptor potential (TRP) cation channel superfamily are candidate calcium influx channels. NFκB activation strictly depends on calcium influx and often induces antiapoptotic genes favouring cell survival. Previously, we reported that S-[6]-gingerol is an efficacious agonist of the transient receptor potential cation channel subfamily V member 1 (TRPV1) in neurones. In this study, we tested the effect of S-[6]-gingerol on HuH-7 cells using the Fluo-4 calcium assay, RT-qPCR, transient cell transfection, and luciferase measurements. We found that S-[6]-gingerol induced a transient rise in [Ca2+]i in HuH-7 cells. The increase in [Ca2+]i induced by S-[6]-gingerol was abolished by preincubation with EGTA and was also inhibited by the TRPV1 channel antagonist capsazepine. Expression of TRPV1 in HuH-7 cells was confirmed by mRNA analysis as well as a test for increase of [Ca2+]i by TRPV1 agonist capsaicin and its inhibition by capsazepine. We found that S-[6]-gingerol induced rapid NFκB activation through TRPV1 in HuH-7 cells. Furthermore, S-[6]-gingerol-induced NFκB activation was dependent on the calcium gradient and TRPV1. The rapid NFκB activation by S-[6]-gingerol was associated with an increase in mRNA levels of NFκB-target genes: cIAP-2, XIAP, and Bcl-2 that encode antiapoptotic proteins.
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37
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Rebolledo CL, Sotelo-Hitschfeld P, Brauchi S, Olavarría MZ. Design and synthesis of conformationally restricted capsaicin analogues based in the 1, 3, 4-thiadiazole heterocycle reveal a novel family of transient receptor potential vanilloid 1 (TRPV1) antagonists. Eur J Med Chem 2013; 66:193-203. [PMID: 23796768 DOI: 10.1016/j.ejmech.2013.05.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Revised: 04/12/2013] [Accepted: 05/01/2013] [Indexed: 11/26/2022]
Abstract
4-hydroxy-3-methoxybenzaldehyde was used as starting material to obtain a number of 1, 3, 4-thiadiazole alkylamide derivatives. The pharmacological properties of these conformationally restricted capsaicin analogues were evaluated on HEK-293T cells transiently expressing TRPV1 receptor. By means of a highthroughput calcium imaging assay we find that 1, 3, 4-thiadiazoles (compounds 8-15) act as potent antagonists of the capsaicin receptor, inhibiting both, the capsaicin- and temperature-dependent activation. Docking studies suggested a different binding orientation on the vanilloid binding site when compared with capsaicin analogues, such as 5-iodononivamide. Overall, our studies suggest that 1, 3, 4-thiadiazoles interact with capsaicin's binding region of the receptor, although using a different set of interactions within the vanilloid binding pocket.
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Affiliation(s)
- Carolyne Lespay Rebolledo
- Department of Organic Chemistry, Faculty of Chemical Sciences, University of Concepcion, Edmundo Larenas 160C, Concepción 1430000, Chile
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38
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de-Sá-Júnior PL, Pasqualoto KFM, Ferreira AK, Tavares MT, Damião MCFCB, de Azevedo RA, Câmara DAD, Pereira A, de Souza DM, Parise Filho R. RPF101, a new capsaicin-like analogue, disrupts the microtubule network accompanied by arrest in the G2/M phase, inducing apoptosis and mitotic catastrophe in the MCF-7 breast cancer cells. Toxicol Appl Pharmacol 2013; 266:385-98. [DOI: 10.1016/j.taap.2012.11.029] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 11/05/2012] [Accepted: 11/19/2012] [Indexed: 10/27/2022]
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39
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Puerto Galvis CE, Kouznetsov VV. An unexpected formation of the novel 7-oxa-2-azabicyclo[2.2.1]hept-5-ene skeleton during the reaction of furfurylamine with maleimides and their bioprospection using a zebrafish embryo model. Org Biomol Chem 2012. [PMID: 23192531 DOI: 10.1039/c2ob26699g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An unexpected intramolecular cyclization during the reaction of furfurylamine with maleimides is reported as a novel strategy for the efficient green synthesis of the 7-oxa-2-azabicyclo[2.2.1]hept-5-ene skeleton. Under the same reaction conditions, 7-oxabicyclo[2.2.1]hept-5-enes were synthesized when furfurylamine was N-protected by the acetyl group. Both types of bicycloheptenes were screened using the zebrafish model system for genetics and developmental biology.
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Affiliation(s)
- Carlos E Puerto Galvis
- Laboratorio de Química Orgánica y Biomolecular, Universidad Industrial de Santander, Cra 27 calle 9, Bucaramanga A.A. 678, Colombia
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40
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Besidski Y, Brown W, Bylund J, Dabrowski M, Dautrey S, Harter M, Horoszok L, Hu Y, Johnson D, Johnstone S, Jones P, Leclerc S, Kolmodin K, Kers I, Labarre M, Labrecque D, Laird J, Lundström T, Martino J, Maudet M, Munro A, Nylöf M, Penwell A, Rotticci D, Slaitas A, Sundgren-Andersson A, Svensson M, Terp G, Villanueva H, Walpole C, Zemribo R, Griffin AM. Potent and orally efficacious benzothiazole amides as TRPV1 antagonists. Bioorg Med Chem Lett 2012; 22:6205-11. [DOI: 10.1016/j.bmcl.2012.08.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 07/23/2012] [Accepted: 08/01/2012] [Indexed: 10/28/2022]
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41
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Blumberg PM, Pearce LV, Lee J. TRPV1 activation is not an all-or-none event: TRPV1 partial agonism/antagonism and its regulatory modulation. Curr Top Med Chem 2012; 11:2151-8. [PMID: 21671879 DOI: 10.2174/156802611796904825] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2010] [Accepted: 10/18/2010] [Indexed: 12/26/2022]
Abstract
TRPV1 has emerged as a promising therapeutic target for pain as well as a broad range of other conditions such as asthma or urge incontinence. The identification of resiniferatoxin as an ultrapotent ligand partially able to dissect the acute activation of TRPV1 from subsequent desensitization and the subsequent intense efforts in medicinal chemistry have revealed that TRPV1 affords a dramatic landscape of opportunities for pharmacological manipulation. While agonism and antagonism have represented the primary directions for drug development, the pharmacological complexity of TRPV1 affords additional opportunities. Partial agonism/partial antagonism, its modulation by signaling pathways, variable desensitization, and slow kinetics of action can all be exploited through drug design.
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Affiliation(s)
- Peter M Blumberg
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892-4255, USA.
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42
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Synthesis and biological evaluation of [6]-gingerol analogues as transient receptor potential channel TRPV1 and TRPA1 modulators. Bioorg Med Chem Lett 2011; 22:1674-7. [PMID: 22257892 DOI: 10.1016/j.bmcl.2011.12.113] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Revised: 12/22/2011] [Accepted: 12/23/2011] [Indexed: 01/08/2023]
Abstract
In order to explore the structural determinants for the TRPV1 and TRPA1 agonist properties of gingerols, a series of nineteen analogues (1b-5) of racemic [6]-gingerol (1a) was synthesized and tested on TRPV1 and TRPA1 channels. The exploration of the structure-activity relationships, by modulating the three pharmacophoric regions of [6]-gingerol, led to the identification of some selective TRPV1 agonists/desensitizers of TRPV1 channels (3a, 3f, and 4) and of some full TRPA1 antagonists (2c, 2d, 3b, and 3d).
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43
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Peng B, Wang J, Peng Z, Zhou S, Wang F, Ji Y, Ye Z, Zhou X, Lin T, Zhang X. Studies on the synthesis, pungency and anti-biofouling performance of capsaicin analogues. Sci China Chem 2011. [DOI: 10.1007/s11426-011-4307-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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44
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Activity-dependent targeting of TRPV1 with a pore-permeating capsaicin analog. Proc Natl Acad Sci U S A 2011; 108:8497-502. [PMID: 21536874 DOI: 10.1073/pnas.1018550108] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The capsaicin receptor TRPV1 is the principal transduction channel for nociception. Excessive TRPV1 activation causes pathological pain. Ideal pain mangement requires selective inhibition of hyperactive pain-sensing neurons, but sparing normal nociception. We sought to determine whether it is possible to use activity-dependent TRPV1 agonists to identify nerves with excessive TRPV1 activity, as well as exploit the TRPV1 pore to deliver charged anesthetics for neuronal silencing. We synthesized a series of permanently charged capsaicinoids and found that one, cap-ET, efficaciously evoked TRPV1-dependent entry of Ca(2+) or the large cationic dye YO-PRO-1 comparably to capsaicin, but far smaller electrical currents. Cap-ET-induced YO-PRO-1 transport required permeation of both the agonist and the dye through the TRPV1 pore and could be enhanced by kinase activation or oxidative covalent modification. Moreover, cap-ET reduced capsaicin-induced currents by a voltage-dependent block of the pore. A low dose of cap-ET elicited entry of permanently charged Na(+) channel blockers to effectively suppress Na(+) currents in sensory neurons presensitized with oxidative chemicals. These results implicate therapeutic potential of these unique TRPV1 agonists exhibiting activity-dependent ion transport but of minimal pain-producing risks.
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Thomas KC, Ethirajan M, Shahrokh K, Sun H, Lee J, Cheatham TE, Yost GS, Reilly CA. Structure-activity relationship of capsaicin analogs and transient receptor potential vanilloid 1-mediated human lung epithelial cell toxicity. J Pharmacol Exp Ther 2011; 337:400-10. [PMID: 21343315 DOI: 10.1124/jpet.110.178491] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Activation of intracellular transient receptor potential vanilloid-1 (TRPV1) in human lung cells causes endoplasmic reticulum (ER) stress, increased expression of proapoptotic GADD153 (growth arrest- and DNA damage-inducible transcript 3), and cytotoxicity. However, in cells with low TRPV1 expression, cell death is not inhibited by TRPV1 antagonists, despite preventing GADD153 induction. In this study, chemical variants of the capsaicin analog nonivamide were synthesized and used to probe the relationship between TRPV1 receptor binding, ER calcium release, GADD153 expression, and cell death in TRPV1-overexpressing BEAS-2B, normal BEAS-2B, and primary normal human bronchial epithelial lung cells. Modification of the 3-methoxy-4-hydroxybenzylamide vanilloid ring pharmacophore of nonivamide reduced the potency of the analogs and rendered several analogs mildly inhibitory. Correlation analysis of analog-induced calcium flux, GADD153 induction, and cytotoxicity revealed a direct relationship for all three endpoints in all three lung cell types for nonivamide and N-(3,4-dihydroxybenzyl)nonanamide. However, the N-(3,4-dihydroxybenzyl)nonanamide analog also produced cytotoxicity through redox cycling/reactive oxygen species formation, shown by inhibition of cell death by N-acetylcysteine. Molecular modeling of binding interactions between the analogs and TRPV1 agreed with data for reduced potency of the analogs, and only nonivamide was predicted to form a "productive" ligand-receptor complex. This study provides vital information on the molecular interactions of capsaicinoids with TRPV1 and substantiates TRPV1-mediated ER stress as a conserved mechanism of lung cell death by prototypical TRPV1 agonists.
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Affiliation(s)
- Karen C Thomas
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, UT 84112, USA
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Eriodictyol: A flavonoid antagonist of the TRPV1 receptor with antioxidant activity. Biochem Pharmacol 2011; 81:544-51. [DOI: 10.1016/j.bcp.2010.11.004] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 10/26/2010] [Accepted: 11/05/2010] [Indexed: 11/19/2022]
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Connor M, Vaughan CW, Vandenberg RJ. N-acyl amino acids and N-acyl neurotransmitter conjugates: neuromodulators and probes for new drug targets. Br J Pharmacol 2010; 160:1857-71. [PMID: 20649585 DOI: 10.1111/j.1476-5381.2010.00862.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
The myriad functions of lipids as signalling molecules is one of the most interesting fields in contemporary pharmacology, with a host of compounds recognized as mediators of communication within and between cells. The N-acyl conjugates of amino acids and neurotransmitters (NAANs) have recently come to prominence because of their potential roles in the nervous system, vasculature and the immune system. NAAN are compounds such as glycine, GABA or dopamine conjugated with long chain fatty acids. More than 70 endogenous NAAN have been reported although their physiological role remains uncertain, with various NAAN interacting with a low affinity at G protein coupled receptors (GPCR) and ion channels. Regardless of their potential physiological function, NAAN are of great interest to pharmacologists because of their potential as flexible tools to probe new sites on GPCRs, transporters and ion channels. NAANs are amphipathic molecules, with a wide variety of potential fatty acid and headgroup moieties, a combination which provides a rich source of potential ligands engaging novel binding sites and mechanisms for modulation of membrane proteins such as GPCRs, ion channels and transporters. The unique actions of subsets of NAAN on voltage-gated calcium channels and glycine transporters indicate that the wide variety of NAAN may provide a readily exploitable resource for defining new pharmacological targets. Investigation of the physiological roles and pharmacological potential of these simple lipid conjugates is in its infancy, and we believe that there is much to be learnt from their careful study.
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Affiliation(s)
- Mark Connor
- Brain and Mind Research Institute, University of Sydney, Camperdown, NSW, Australia.
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Sultana N, Akhter M, Khatoon Z. Nematicidal natural products from the aerial parts of Rubus niveus. Nat Prod Res 2010; 24:407-15. [PMID: 20306362 DOI: 10.1080/14786410802696429] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Studies on the aerial parts of Rubus niveus yielded six known compounds, 3,5-dihydroxy benzoic acid C(7)H(6)O(4), (1), gallic acid C(7)H(6)O(5) (2), ethyl galactoside (3), oleanolic acid (4), beta-sitosterol (5) and 3-O-[beta-D-galactopyranosyl-(12)-D-glucopyranoside (6). Besides this, a gallic acid derivative with methyl substitution was synthesised as tetramethyl gallate (3). Together with this derivative, compounds 1, 2, the alcohol soluble, chloroform soluble and petroleum ether soluble extracts of the aerial parts of R. niveus were screened for its nematicidal activity against freshly hatched second stage juveniles of Meloidogyne incognita (root-knot nematode), exhibiting 100, 94, 100, 52, 45 and 14% mortality, respectively of M. incognita after 48 h at 0.5% concentration. Compounds 1, 2 and 3 were found to be more potent than the nematicide Azadirachta indica at the same concentration. Negative results were obtained for nematicidal activity of the petroleum ether extract of R. niveus leaf extract. This is the first report on the isolation of chemical constituents as well as the nematicidal activity of compounds and any part of R. niveus.
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Affiliation(s)
- Nighat Sultana
- Pharmaceutical Research Center, PCSIR Laboratories Complex, Karachi, Pakistan.
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In vitro TRPV1 activity of piperine derived amides. Bioorg Med Chem 2010; 18:3299-306. [PMID: 20381363 DOI: 10.1016/j.bmc.2010.03.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2010] [Revised: 03/04/2010] [Accepted: 03/06/2010] [Indexed: 11/22/2022]
Abstract
A series of natural and synthetic piperine amides were evaluated for activity on the human TRPV1 expressed in HEK293 cells. The agonistic effect of piperine amides was mainly dependent on the length of the carbon chain. Structural changes of double bonds and stereochemistry in the aliphatic chain of these compounds did not change their potency or efficacy, indicating that increased rigidity or planarity of the piperine structure does not affect the activity. The opening of the methylenedioxy ring or changes in the heterocyclic ring of the piperine molecule reduced or abolished activity. Furthermore, inactive compounds did not display functional antagonistic activity.
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Pharmacokinetic analysis of capsaicin after topical administration of a high-concentration capsaicin patch to patients with peripheral neuropathic pain. Ther Drug Monit 2010; 31:502-10. [PMID: 19494795 DOI: 10.1097/ftd.0b013e3181a8b200] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Capsaicin, a pungent compound in chili peppers, is a highly selective agonist for the transient receptor potential vanilloid 1 receptor expressed in nociceptive sensory nerves. A high-concentration (640 microg/cm2) capsaicin patch, designated NGX-4010, is in clinical evaluation for the management of peripheral neuropathic pain. To determine systemic capsaicin exposure after single 60- or 90-minute NGX-4010 applications, plasma samples were collected from 173 patients with postherpetic neuralgia (PHN), painful human immunodeficiency virus-associated neuropathy (HIV-AN), and painful diabetic neuropathy (PDN). The percentages of patients with quantifiable levels of capsaicin at any time point were 31% for PHN (30 of 96), 7% for HIV-AN (3 of 44), and 3% for PDN (1 of 33). The maximum plasma concentration observed in any patient was 17.8 ng/mL. Due to the limited number of quantifiable levels, a population analysis was performed to characterize the pharmacokinetics (PK) of capsaicin. Plasma concentrations were fitted adequately using a 1-compartment model with first-order absorption and linear elimination. Capsaicin levels declined very rapidly, with a mean population elimination half-life of 1.64 hours. Mean area under the curve and C max values after a 60-minute application were 7.42 ng x h/mL and 1.86 ng/mL, respectively. Only a few correlations between calculated PK parameters and patient characteristics were observed. Duration and area of application of the patch were detected as significant covariates explaining the PK of capsaicin. Ninety-minute applications of NGX-4010 resulted in capsaicin area under the curve and Cmax values approximately 1.78- and 2.15-fold higher than those observed in patients treated for 60 minutes. Treatment on the feet (patients with HIV-AN and PDN) produced far lower systemic exposure than treatment on the trunk (patients with PHN). Finally, larger treatment areas were associated with statistically higher Vc/F values. The low systemic exposure and very rapid elimination half-life of capsaicin after NGX-4010 administration are unlikely to result in systemic effects and support the overall safety profile of this investigational cutaneous patch.
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