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Shaha A, Islam R, Tanaka N, Kashiwada Y, Fukui H, Takeda N, Kitamura Y, Mizuguchi H. Betuletol, a Propolis Component, Suppresses IL-33 Gene Expression and Effective against Eosinophilia. Molecules 2022; 27:molecules27175459. [PMID: 36080225 PMCID: PMC9457836 DOI: 10.3390/molecules27175459] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 08/19/2022] [Accepted: 08/23/2022] [Indexed: 11/16/2022] Open
Abstract
Propolis, a resinous substance produced by honeybees, has been used in folk medicine since ancient times due to its many biological benefits such as antitumor, antioxidant, antimicrobial, anti-inflammatory, and immunomodulatory effects. Propolis contains flavonoids, terpenoids, aromatic aldehydes, and alcohols, which vary with different climate and environmental conditions. In our study, we examined the antiallergic activity of Brazilian green propolis (BGP) and isolated the active compound that can suppress an allergy-sensitive gene, IL-33, expression and eosinophilia. Ethanolic extract of BGP freeze-dried powder was fractionated with several solvent systems, and the active fractions were collected based on activity measurement. The single active compound was found by thin-layer chromatography. Using column chromatography and NMR, the active compound was isolated and identified as 3,5,7-trihydroxy-6,4’-dimethoxyflavone, also known as betuletol. Further, the antiallergic activity of that has been examined in PMA-induced up-regulation of IL-33 gene expression in Swiss 3T3 cells. Our data showed the IL-33 gene suppression both by BGP and the isolated active compound, betuletol. We also found that betuletol suppressed ERK phosphorylation, suggesting it could be effective in suppressing IL-33 mediated eosinophilic chronic inflammation and will provide new insights to develop potent therapeutics against allergic inflammations.
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Affiliation(s)
- Aurpita Shaha
- Department of Molecular Pharmacology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
- Laboratory of Tumor Microenvironment and Metastasis, The Hormel Institute, University of Minnesota, Austin, MN 55912, USA
| | - Rezwanul Islam
- Department of Molecular Pharmacology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
- Department of Biomedical Sciences, Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, USA
| | - Naonobu Tanaka
- Department of Parmacognosy, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Yoshiki Kashiwada
- Department of Parmacognosy, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Hiroyuki Fukui
- Laboratory of Pharmacology, Faculty of Pharmacy, Osaka Ohtani University, Osaka 584-8540, Japan
- Medical Corporation Kinshukai, Osaka 558-0011, Japan
| | - Noriaki Takeda
- Department of Otolaryngology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Yoshiaki Kitamura
- Department of Otolaryngology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Hiroyuki Mizuguchi
- Laboratory of Pharmacology, Faculty of Pharmacy, Osaka Ohtani University, Osaka 584-8540, Japan
- Correspondence: ; Tel.: +81-721-24-9462
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Lim S, Jeong I, Cho J, Shin C, Kim KI, Shim BS, Ko SG, Kim B. The Natural Products Targeting on Allergic Rhinitis: From Traditional Medicine to Modern Drug Discovery. Antioxidants (Basel) 2021; 10:1524. [PMID: 34679659 PMCID: PMC8532887 DOI: 10.3390/antiox10101524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 09/14/2021] [Accepted: 09/22/2021] [Indexed: 11/29/2022] Open
Abstract
More than 500 million people suffer from allergic rhinitis (AR) in the world. Current treatments include oral antihistamines and intranasal corticosteroids; however, they often cause side effects and are unsuitable for long-term exposure. Natural products could work as a feasible alternative, and this study aimed to review the efficacies and mechanisms of natural substances in AR therapies by examining previous literature. Fifty-seven studies were collected and classified into plants, fungi, and minerals decoction; clinical trials were organized separately. The majority of the natural products showed their efficacies by two mechanisms: anti-inflammation regulating diverse mediators and anti-oxidation controlling the activity of nuclear factor kappa-light-chain-enhancer of activated B cells (NFκB) pathway stimulated by reactive oxygen species (ROS). The main AR factors modified by natural products included interleukin (IL)-4, IL-5, IL-13, interferon-gamma (IFN-γ), tumor necrosis factor-α (TNF-α), cyclooxygenase 2 (COX-2), and phospho-ERK1/2 (p-ERK1/2). Although further studies are required to verify their efficacies and safeties, natural products can significantly contribute to the treatment of AR.
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Affiliation(s)
- Suhyun Lim
- College of Korean Medicine, Kyung Hee University, Seoul 02447, Korea; (S.L.); (I.J.); (J.C.); (C.S.); (B.-S.S.); (S.-G.K.)
| | - Iwah Jeong
- College of Korean Medicine, Kyung Hee University, Seoul 02447, Korea; (S.L.); (I.J.); (J.C.); (C.S.); (B.-S.S.); (S.-G.K.)
| | - Jonghyeok Cho
- College of Korean Medicine, Kyung Hee University, Seoul 02447, Korea; (S.L.); (I.J.); (J.C.); (C.S.); (B.-S.S.); (S.-G.K.)
| | - Chaewon Shin
- College of Korean Medicine, Kyung Hee University, Seoul 02447, Korea; (S.L.); (I.J.); (J.C.); (C.S.); (B.-S.S.); (S.-G.K.)
| | - Kwan-Il Kim
- Division of Allergy, Immune and Respiratory System, Department of Internal Korean Medicine, Kyung Hee University, Seoul 02447, Korea;
| | - Bum-Sang Shim
- College of Korean Medicine, Kyung Hee University, Seoul 02447, Korea; (S.L.); (I.J.); (J.C.); (C.S.); (B.-S.S.); (S.-G.K.)
| | - Seong-Gyu Ko
- College of Korean Medicine, Kyung Hee University, Seoul 02447, Korea; (S.L.); (I.J.); (J.C.); (C.S.); (B.-S.S.); (S.-G.K.)
- Korean Medicine-Based Drug Repositioning Cancer Research Center, College of Korean Medicine, Kyung Hee University, Seoul 02447, Korea
| | - Bonglee Kim
- College of Korean Medicine, Kyung Hee University, Seoul 02447, Korea; (S.L.); (I.J.); (J.C.); (C.S.); (B.-S.S.); (S.-G.K.)
- Korean Medicine-Based Drug Repositioning Cancer Research Center, College of Korean Medicine, Kyung Hee University, Seoul 02447, Korea
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Effects of Syo-seiryu-to and Its Constituent Crude Drugs on Phorbol Ester-Induced Up-Regulation of IL-33 and Histamine H1 Receptor mRNAs in Swiss 3T3 and HeLa Cells. ALLERGIES 2021. [DOI: 10.3390/allergies1030015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Syo-seiryu-to (SST) is a traditional herbal medicine that has been used clinically to treat allergic rhinitis (AR) in Japan. SST improves acute symptoms, such as sneezing and rhinorrhea, as well as chronic symptoms, such as nasal obstruction, in patients with AR. However, its therapeutic mechanisms remain unknown. We examined the effects of SST and eight constituent crude drugs on phorbol 12-myristate-13-acetate (PMA)-induced gene up-regulation of IL-33 and histamine H1 receptor (H1R), which are responsible for the pathogenesis of AR. We found that SST and its crude drugs, except for Pinellia tuber, significantly and dose-dependently suppressed PMA-induced both IL-33 and H1R mRNA up-regulation in vitro. The half-maximal inhibitory concentration values of the seven crude drugs to inhibit PMA-induced IL-33 mRNA up-regulation were correlated with those related to H1R mRNA up-regulation, suggesting that they act on a common signal molecule. These results suggest that SST improves nasal congestion that is induced by IL-33-related eosinophil infiltration and inhibits sneezing and rhinorrhea that are induced by H1R-mediated histamine signaling in the nasal mucosa of AR patients through its inhibition of a common molecule in the gene expression pathways of IL-33 and H1R. The results could explain the advantages of traditional herbal medicine, in which mixing various crude drugs not only acts on a common target to enhance its pharmacological action, similar to the effect of a high concentration of a single crude extract but also has the benefit of reducing the side effects of each crude drug.
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Rahim NA, Jantan I, Said MM, Jalil J, Abd Razak AF, Husain K. Anti-Allergic Rhinitis Effects of Medicinal Plants and Their Bioactive Metabolites via Suppression of the Immune System: A Mechanistic Review. Front Pharmacol 2021; 12:660083. [PMID: 33927634 PMCID: PMC8076953 DOI: 10.3389/fphar.2021.660083] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 03/10/2021] [Indexed: 12/30/2022] Open
Abstract
Allergic rhinitis (AR) is a common inflammatory condition of the nasal mucosa and it is an immunoglobulin E-mediated disease. The incidence and prevalence of AR globally have been escalating over recent years. Antihistamines, intranasal corticosteroids, decongestants, intranasal anticholinergics, intranasal cromolyn, leukotriene receptor antagonists and immunotherapy have been used in the treatment of AR. However, there is a need to search for more effective and safer remedies as many of the current treatments have reported side effects. Medicinal plants have been used traditionally to relief symptoms of AR but their efficacy and safety have not been scientifically proven. In this review, up-to-date reports of studies on the anti-allergic rhinitis of several medicinal plants and their bioactive metabolites through suppression of the immune system are compiled and critically analyzed. The plant samples were reported to suppress the productions of immunoglobulin E, cytokines and eosinophils and inhibit histamine release. The suppression of cytokines production was found to be the main mechanistic effect of the plants to give symptomatic relief. The prospect of these medicinal plants as sources of lead molecules for development of therapeutic agents to treat AR is highlighted. Several bioactive metabolites of the plants including shikonin, okicamelliaside, warifteine, methylwarifteine, luteolin-7-O-rutinoside, tussilagone, petasin, and mangiferin have been identified as potential candidates for development into anti-allergic rhinitis agents. The data collection was mainly from English language articles published in journals, or studies from EBSCOHOST, Medline and Ovid, Scopus, Springer, and Google Scholar databases from the year 1985-2020. The terms or keywords used to find relevant studies were allergic rhinitis OR pollinosis OR hay fever, AND medicinal plant OR single plant OR single herb OR phytotherapy. This comprehensive review serves as a useful resource for medicinal plants with anti-allergic rhinitis potential, understanding the underlying mechanisms of action and for future exploration to find natural product candidates in the development of novel anti-allergic rhinitis agents.
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Affiliation(s)
- Nur Amira Rahim
- Drug and Herbal Research Centre, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Ibrahim Jantan
- Institute of Systems Biology, Universiti Kebangsaan Malaysia, Bangi, Malaysia
| | - Mazlina Mohd Said
- Drug and Herbal Research Centre, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Juriyati Jalil
- Drug and Herbal Research Centre, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Amirul Faiz Abd Razak
- Drug and Herbal Research Centre, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Khairana Husain
- Drug and Herbal Research Centre, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
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Kamimura S, Kitamura Y, Fujii T, Okamoto K, Sanada N, Okajima N, Wakugawa T, Fukui H, Mizuguchi H, Takeda N. Effects of narrow-band UVB on nasal symptom and upregulation of histamine H 1 receptor mRNA in allergic rhinitis model rats. Laryngoscope Investig Otolaryngol 2021; 6:34-41. [PMID: 33614927 PMCID: PMC7883611 DOI: 10.1002/lio2.518] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 12/14/2020] [Accepted: 12/26/2020] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Phototherapy with narrow-band ultraviolet B (narrow-band UVB) is clinically effective treatment for atopic dermatitis. In the present study, we examined the effects of intranasal irradiation with narrow-band UVB on nasal symptom, upregulation of histamine H1 receptor (H1R) gene expression and induction of DNA damage in the nasal mucosa of allergic rhinitis (AR) model rat. METHODS AR model rats were intranasally irradiated with 310 nm of narrow-band UVB. Nasal mucosal levels of H1R mRNA were measured using real-time quantitative reverse transcriptase (RT)-PCR. DNA damage was evaluated using cyclobutane pyrimidine dimer (CPD) immunostaining. RESULTS In toluene 2,4-diisocyanate (TDI)-sensitized rats, TDI provoked sneezes and H1R gene expression in the nasal mucosa. Intranasal pre-irradiation with 310 nm narrow-band UVB at doses of 600 and 1400, but not 200 mJ/cm2 significantly inhibited the number of sneezes and upregulation of H1R gene expression provoked by TDI. CPD-positive cells appeared in the nasal mucosa after intranasal narrow-band UVB irradiation at a dose of 1400, but not 200 and 600 mJ/cm2. The suppression of TDI-provoked sneezes and upregulation of H1R gene expression lasted 24 hours, but not 48 hours, after narrow-band UVB irradiation with a dose of 600 mJ/cm2. CONCLUSIONS Intranasal pre-irradiation with narrow-band UVB dose-dependently inhibited sneezes and upregulation of H1R gene expression of the nasal mucosa in AR model rats, suggesting that the inhibition of nasal upregulation of H1R gene expression suppressed nasal symptom. The suppression after narrow-band UVB irradiation at a dose of 600 mJ/cm2 was reversible without induction of DNA damage. These findings indicated that low-dose narrow-band UVB phototherapy could be effectively and safely used for AR treatment in a clinical setting. LEVEL OF EVIDENCE NA.
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Affiliation(s)
- Seiichiro Kamimura
- Department of OtolaryngologyInstitute of Biomedical Sciences, Tokushima University Graduate SchoolTokushimaJapan
| | - Yoshiaki Kitamura
- Department of OtolaryngologyInstitute of Biomedical Sciences, Tokushima University Graduate SchoolTokushimaJapan
| | - Tatsuya Fujii
- Department of OtolaryngologyInstitute of Biomedical Sciences, Tokushima University Graduate SchoolTokushimaJapan
| | - Kentaro Okamoto
- Department of Molecular PharmacologyInstitute of Biomedical Sciences, Tokushima University Graduate SchoolTokushimaJapan
| | - Nanae Sanada
- Department of Molecular PharmacologyInstitute of Biomedical Sciences, Tokushima University Graduate SchoolTokushimaJapan
| | - Natsuki Okajima
- Department of Molecular PharmacologyInstitute of Biomedical Sciences, Tokushima University Graduate SchoolTokushimaJapan
| | - Tomoharu Wakugawa
- Department of Molecular PharmacologyInstitute of Biomedical Sciences, Tokushima University Graduate SchoolTokushimaJapan
| | - Hiroyuki Fukui
- Department of OtolaryngologyInstitute of Biomedical Sciences, Tokushima University Graduate SchoolTokushimaJapan
| | - Hiroyuki Mizuguchi
- Laboratory of Pharmacology, Faculty of PharmacyOsaka Ohtani UniversityOsakaJapan
| | - Noriaki Takeda
- Department of OtolaryngologyInstitute of Biomedical Sciences, Tokushima University Graduate SchoolTokushimaJapan
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Kim M, Jo H, Kwon Y, Kim Y, Jung HS, Jeoung D. Homoharringtonine Inhibits Allergic Inflammations by Regulating NF-κB-miR-183-5p-BTG1 Axis. Front Pharmacol 2020; 11:1032. [PMID: 32733254 PMCID: PMC7358642 DOI: 10.3389/fphar.2020.01032] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 06/25/2020] [Indexed: 12/28/2022] Open
Abstract
Homoharringtonine (HHT) is a drug for treatment of chronic myeloid leukemia. However, the role of HHT in allergic inflammations remains unknown. Mouse model of atopic dermatitis (AD) induced by 2, 4,-dinitroflurobenzene (DNFB) and anaphylaxis employing 2,4-dinitropheny-human serum albumin (DNP-HSA) were used to examine the role of HHT in allergic inflammations. HHT inhibited in vitro allergic reactions and attenuated clinical symptoms associated with AD. DNFB induced features of allergic reactions in rat basophilic leukemia (RBL2H3) cells. HHT suppressed effect of AD on the expression of Th1/Th2 cytokines. HHT inhibited passive cutaneous anaphylaxis and passive systemic anaphylaxis. MiR-183-5p, increased by antigen stimulation, was downregulated by HHT in RBL2H3 cells. MiR-183-5p inhibitor suppressed anaphylaxis and AD. B cell translocation gene 1 (BTG1) was shown to be a direct target of miR-183-5p. BTG1 prevented antigen from inducing molecular features of in vitro allergic reactions. AD increased the expression of NF-κB, and NF-κB showed binding to the promoter sequences of miR-183-5p. NF-κB and miR-183 formed positive feedback to mediate in vitro allergic reactions. Thus, HHT can be an anti-allergy drug. We present evidence that NF-κB-miR-183-5p-BTG1 axis can serve as target for development of anti-allergy drug.
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Affiliation(s)
- Misun Kim
- Department of Biochemistry, Kangwon National University, Chunchon, South Korea
| | - Hyein Jo
- Department of Biochemistry, Kangwon National University, Chunchon, South Korea
| | - Yoojung Kwon
- Department of Biochemistry, Kangwon National University, Chunchon, South Korea
| | - Youngmi Kim
- College of Medicine, Institute of New Frontier Research, Hallym University, Chunchon, South Korea
| | - Hyun Suk Jung
- Department of Biochemistry, Kangwon National University, Chunchon, South Korea
| | - Dooil Jeoung
- Department of Biochemistry, Kangwon National University, Chunchon, South Korea
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Nakano T, Ikeda M, Wakugawa T, Kashiwada Y, Kaminuma O, Kitamura N, Yabumoto M, Fujino H, Kitamura Y, Fukui H, Takeda N, Mizuguchi H. Identification of pyrogallol from Awa-tea as an anti-allergic compound that suppresses nasal symptoms and IL-9 gene expression. THE JOURNAL OF MEDICAL INVESTIGATION 2020; 67:289-297. [PMID: 33148904 DOI: 10.2152/jmi.67.289] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
As the expression level of allergic disease sensitive genes are correlated with the severity of allergic symptoms, suppression of these gene expressions could be promising therapeutics. We demonstrated that protein kinase Cδ / heat shock protein 90-mediated H1R gene expression signaling and nuclear factor of activated T-cells (NFAT)-mediated IL-9 gene expression signaling are responsible for the pathogenesis of pollinosis. Treatment with Awa-tea combined with wild grape hot water extract suppressed these signaling and alleviated nasal symptoms in toluene-2,4-diisocyanate (TDI)-sensitized rats. However, the underlying mechanism of its anti-allergic activity is not elucidated yet. Here, we sought to identify an anti-allergic compound from Awa-tea and pyrogallol was identified as an active compound. Pyrogallol strongly suppressed ionomycin-induced up-regulation of IL-9 gene expression in RBL-2H3 cells. Treatment with pyrogallol in combination with epinastine alleviated nasal symptoms and suppressed up-regulation of IL-9 gene expression in TDI-sensitized rats. Pyrogallol itself did not inhibit calcineurin phosphatase activity. However, pyrogallol suppressed ionomycin-induced dephosphorylation and nuclear translocation of NFAT. These data suggest pyrogallol is an anti-allergic compound in Awa-tea and it suppressed NFAT-mediated IL-9 gene expression through the inhibition of dephosphorylation of NFAT. This might be the underlying mechanism of the therapeutic effects of combined therapy of pyrogallol with antihistamine. J. Med. Invest. 67 : 289-297, August, 2020.
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Affiliation(s)
- Tomohiro Nakano
- Department of Molecular Pharmacology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8505, Japan
| | - Mitsuhiro Ikeda
- Department of Molecular Pharmacology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8505, Japan
| | - Tomoharu Wakugawa
- Department of Molecular Pharmacology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8505, Japan
| | - Yoshiki Kashiwada
- Department of Pharmacognosy, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8505, Japan
| | - Osamu Kaminuma
- Department of Disease Model Research Institute of Radiation Biology and Medicine, Hiroshima University, Hiroshima 734-8553, Japan
| | - Noriko Kitamura
- Allergy and Immunology Project, The Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
| | | | - Hiromichi Fujino
- Department of Molecular Pharmacology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8505, Japan
| | - Yoshiaki Kitamura
- Department of Otolalyngology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Hiroyuki Fukui
- Medical Corporation Kinshukai, Osaka 558-0011, Japan.,Laboratory of Pharmacology, Faculty of Pharmacy, Osaka Ohtani University, Osaka 584-8540, Japan
| | - Noriaki Takeda
- Department of Otolalyngology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Hiroyuki Mizuguchi
- Laboratory of Pharmacology, Faculty of Pharmacy, Osaka Ohtani University, Osaka 584-8540, Japan
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Barbosa-Méndez S, Salazar-Juarez A. Melatonin does not produce sedation in rats: A chronobiological study. Chronobiol Int 2019; 37:353-374. [DOI: 10.1080/07420528.2019.1702554] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Susana Barbosa-Méndez
- Molecular Neurobiology and Neurochemistry of Addiction, Ramón de la Fuente Muñiz National Institute of Psychiatry, Ciudad de México, México
| | - Alberto Salazar-Juarez
- Molecular Neurobiology and Neurochemistry of Addiction, Ramón de la Fuente Muñiz National Institute of Psychiatry, Ciudad de México, México
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