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Yang W, Gong X, Sun H, Wu C, Suo J, Ji J, Jiang X, Shen J, He Y, Aisa HA. Discovery of a CB 2 and 5-HT 1A receptor dual agonist for the treatment of depression and anxiety. Eur J Med Chem 2024; 265:116048. [PMID: 38150961 DOI: 10.1016/j.ejmech.2023.116048] [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: 10/07/2023] [Revised: 11/29/2023] [Accepted: 12/11/2023] [Indexed: 12/29/2023]
Abstract
Cannabinoid CB2R agonists have gained considerable attention as potential novel therapies for psychiatric disorders due to their non-psychoactive nature, in contrast to CB1R agonists. In this study, we employed molecular docking to design and synthesize 23 derivatives of cannabidiol (CBD) with the aim of discovering potent CB2R agonists rather than CB2R antagonists or inverse agonists. Structure-activity relationship (SAR) investigations highlighted the critical importance of the amide group at the C-3' site and the cycloalkyl group at the C-4' site for CB2R activation. Interestingly, three CBD derivatives, namely 2o, 6g, and 6h, exhibited substantial partial agonistic activity towards the CB2 receptor, in contrast to the inverse agonistic property of CBD. Among these, 2o acted as a CB2R and 5-HT1AR dual agonist, albeit with some undesired antagonist activity for CB1R. It demonstrated significant CB2R partial agonism while maintaining a level of 5-HT1AR agonistic and CB1R antagonistic activity similar to CBD. Pharmacokinetic experiments confirmed that 2o possesses favorable pharmacokinetic properties. Behavioral studies further revealed that 2o elicits significant antidepressant-like and anxiolytic-like effects while maintaining a good safety profile.
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Affiliation(s)
- Wenjiao Yang
- State Key Laboratory Basis of Xinjiang Indigenous Medicinal Plants Resource Utilization, and Key Laboratory of Plant Resources and Chemistry of Arid Zone, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xudong Gong
- Vigonvita Shanghai Co., Ltd, Shanghai, 201210, China
| | - Haiguo Sun
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China
| | - Chunhui Wu
- Vigonvita Shanghai Co., Ltd, Shanghai, 201210, China
| | - Jin Suo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China
| | - Jing Ji
- State Key Laboratory Basis of Xinjiang Indigenous Medicinal Plants Resource Utilization, and Key Laboratory of Plant Resources and Chemistry of Arid Zone, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiangrui Jiang
- University of Chinese Academy of Sciences, Beijing, 100049, China; State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China
| | - Jingshan Shen
- University of Chinese Academy of Sciences, Beijing, 100049, China; State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China.
| | - Yang He
- University of Chinese Academy of Sciences, Beijing, 100049, China; State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China.
| | - Haji Akber Aisa
- State Key Laboratory Basis of Xinjiang Indigenous Medicinal Plants Resource Utilization, and Key Laboratory of Plant Resources and Chemistry of Arid Zone, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
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2
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Alfei S, Schito GC, Schito AM. Synthetic Pathways to Non-Psychotropic Phytocannabinoids as Promising Molecules to Develop Novel Antibiotics: A Review. Pharmaceutics 2023; 15:1889. [PMID: 37514074 PMCID: PMC10384972 DOI: 10.3390/pharmaceutics15071889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 06/27/2023] [Accepted: 07/01/2023] [Indexed: 07/30/2023] Open
Abstract
Due to the rapid emergence of multi drug resistant (MDR) pathogens against which current antibiotics are no longer functioning, severe infections are becoming practically untreatable. Consequently, the discovery of new classes of effective antimicrobial agents with novel mechanism of action is becoming increasingly urgent. The bioactivity of Cannabis sativa, an herbaceous plant used for millennia for medicinal and recreational purposes, is mainly due to its content in phytocannabinoids (PCs). Among the 180 PCs detected, cannabidiol (CBD), Δ8 and Δ9-tetrahydrocannabinols (Δ8-THC and Δ9-THC), cannabichromene (CBC), cannabigerol (CBG), cannabinol (CBN) and some of their acidic precursors have demonstrated from moderate to potent antibacterial effects against Gram-positive bacteria (MICs 0.5-8 µg/mL), including methicillin-resistant Staphylococcus aureus (MRSA), epidemic MRSA (EMRSA), as well as fluoroquinolone and tetracycline-resistant strains. Particularly, the non-psychotropic CBG was also capable to inhibit MRSA biofilm formation, to eradicate even mature biofilms, and to rapidly eliminate MRSA persiter cells. In this scenario, CBG, as well as other minor non-psychotropic PCs, such as CBD, and CBC could represent promising compounds for developing novel antibiotics with high therapeutic potential. Anyway, further studies are necessary, needing abundant quantities of such PCs, scarcely provided naturally by Cannabis plants. Here, after an extensive overture on cannabinoids including their reported antimicrobial effects, aiming at easing the synthetic production of the necessary amounts of CBG, CBC and CBD for further studies, we have, for the first time, systematically reviewed the synthetic pathways utilized for their synthesis, reporting both reaction schemes and experimental details.
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Affiliation(s)
- Silvana Alfei
- Department of Pharmacy (DIFAR), University of Genoa, Viale Cembrano, 4, 16148 Genoa, Italy
| | - Gian Carlo Schito
- Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, Viale Benedetto XV, 6, 16132 Genova, Italy
| | - Anna Maria Schito
- Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, Viale Benedetto XV, 6, 16132 Genova, Italy
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3
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Bosquez-Berger T, Wilson S, Iliopoulos-Tsoutsouvas C, Jiang S, Wager-Miller J, Nikas SP, Mackie KP, Makriyannis A, Straiker A. Differential Enantiomer-Specific Signaling of Cannabidiol at CB 1 Receptors. Mol Pharmacol 2022; 102:259-268. [PMID: 36153039 PMCID: PMC11033957 DOI: 10.1124/molpharm.121.000305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 09/05/2022] [Indexed: 11/22/2022] Open
Abstract
The two main constituents of cannabis are Δ9-tetrahydrocannabinol (THC) and cannabidiol (CBD). While Δ9-THC pharmacology has been studied extensively, CBD-long considered inactive-is now the subject of vigorous research related to epilepsy, pain, and inflammation and is popularly embraced as a virtual cure-all. However, our understanding of CBD pharmacology remains limited, although CBD inhibits cannabinoid CB1 receptor signaling, likely as a negative allosteric modulator. Cannabis synthesizes (-)-CBD, but CBD can also exist as an enantiomer, (+)-CBD. We enantioselectively synthesized both CBD enantiomers using established conditions and describe here a new, practical, and reliable, NMR-based method for confirming the enantiomeric purity of two CBD enantiomers. We also investigated the pharmacology of (+)-CBD in autaptic hippocampal neurons, a well-characterized neuronal model of endogenous cannabinoid signaling, and in CHO-K1 cells. We report the inhibition constant for displacing CP55,940 at CB1 by (+)-CBD, is 5-fold lower than (-)-CBD. We find that (+)-CBD is ∼10 times more potent at inhibiting depolarization-induced suppression of excitation (DSE), a form of endogenous cannabinoid-mediated retrograde synaptic plasticity. (+)-CBD also inhibits CB1 suppression of cAMP accumulation but with less potency, indicating that the signaling profiles of the enantiomers differ in a pathway-specific manner. In addition, we report that (+)-CBD stereoselectively and potently activates the sphingosine-1 phosphate (S1P) receptors, S1P1 and S1P3 These results provide an attractive method for synthesizing and distinguishing enantiomers of CBD and related phytocannabinoids and provide further evidence that these enantiomers have their own unique and interesting signaling properties. SIGNIFICANCE STATEMENT: Cannabidiol (CBD) is the subject of considerable scientific and popular interest, but we know little of the enantiomers of CBD. We find that the enantiomer (+)-CBD is substantially more potent inhibitor of cannabinoid CB1 receptors and that it activates sphingosine-1-phosphate receptors in an enantiomer-specific manner; we have additionally developed an improved method for the synthesis of enantiomers of CBD and related compounds.
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Affiliation(s)
- Taryn Bosquez-Berger
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Program in Neuroscience, Indiana University, Bloomington, Indiana (T.B., S.W., J.W.M., K.M., A.S.); and Center for Drug Discovery and Department of Pharmaceutical Sciences (C.I.T., S.P.N., A.M.) and Center for Drug Discovery and Department of Chemistry and Chemical Biology (S.J., A.M.), Northeastern University, Boston, Massachusetts
| | - Sierra Wilson
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Program in Neuroscience, Indiana University, Bloomington, Indiana (T.B., S.W., J.W.M., K.M., A.S.); and Center for Drug Discovery and Department of Pharmaceutical Sciences (C.I.T., S.P.N., A.M.) and Center for Drug Discovery and Department of Chemistry and Chemical Biology (S.J., A.M.), Northeastern University, Boston, Massachusetts
| | - Christos Iliopoulos-Tsoutsouvas
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Program in Neuroscience, Indiana University, Bloomington, Indiana (T.B., S.W., J.W.M., K.M., A.S.); and Center for Drug Discovery and Department of Pharmaceutical Sciences (C.I.T., S.P.N., A.M.) and Center for Drug Discovery and Department of Chemistry and Chemical Biology (S.J., A.M.), Northeastern University, Boston, Massachusetts
| | - Shan Jiang
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Program in Neuroscience, Indiana University, Bloomington, Indiana (T.B., S.W., J.W.M., K.M., A.S.); and Center for Drug Discovery and Department of Pharmaceutical Sciences (C.I.T., S.P.N., A.M.) and Center for Drug Discovery and Department of Chemistry and Chemical Biology (S.J., A.M.), Northeastern University, Boston, Massachusetts
| | - Jim Wager-Miller
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Program in Neuroscience, Indiana University, Bloomington, Indiana (T.B., S.W., J.W.M., K.M., A.S.); and Center for Drug Discovery and Department of Pharmaceutical Sciences (C.I.T., S.P.N., A.M.) and Center for Drug Discovery and Department of Chemistry and Chemical Biology (S.J., A.M.), Northeastern University, Boston, Massachusetts
| | - Spyros P Nikas
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Program in Neuroscience, Indiana University, Bloomington, Indiana (T.B., S.W., J.W.M., K.M., A.S.); and Center for Drug Discovery and Department of Pharmaceutical Sciences (C.I.T., S.P.N., A.M.) and Center for Drug Discovery and Department of Chemistry and Chemical Biology (S.J., A.M.), Northeastern University, Boston, Massachusetts
| | - Ken P Mackie
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Program in Neuroscience, Indiana University, Bloomington, Indiana (T.B., S.W., J.W.M., K.M., A.S.); and Center for Drug Discovery and Department of Pharmaceutical Sciences (C.I.T., S.P.N., A.M.) and Center for Drug Discovery and Department of Chemistry and Chemical Biology (S.J., A.M.), Northeastern University, Boston, Massachusetts
| | - Alexandros Makriyannis
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Program in Neuroscience, Indiana University, Bloomington, Indiana (T.B., S.W., J.W.M., K.M., A.S.); and Center for Drug Discovery and Department of Pharmaceutical Sciences (C.I.T., S.P.N., A.M.) and Center for Drug Discovery and Department of Chemistry and Chemical Biology (S.J., A.M.), Northeastern University, Boston, Massachusetts
| | - Alex Straiker
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Program in Neuroscience, Indiana University, Bloomington, Indiana (T.B., S.W., J.W.M., K.M., A.S.); and Center for Drug Discovery and Department of Pharmaceutical Sciences (C.I.T., S.P.N., A.M.) and Center for Drug Discovery and Department of Chemistry and Chemical Biology (S.J., A.M.), Northeastern University, Boston, Massachusetts
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4
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Tagen M, Klumpers LE. Review of delta-8-tetrahydrocannabinol (Δ 8 -THC): Comparative pharmacology with Δ 9 -THC. Br J Pharmacol 2022; 179:3915-3933. [PMID: 35523678 DOI: 10.1111/bph.15865] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 03/29/2022] [Accepted: 04/26/2022] [Indexed: 12/13/2022] Open
Abstract
The use of the intoxicating cannabinoid delta-8-tetrahydrocannabinol (Δ8 -THC) has grown rapidly over the last several years. There have been dozens of Δ8 -THC studies dating back over many decades, yet no review articles have comprehensively covered these findings. In this review, we summarize the pharmacological studies of Δ8 -THC, including receptor binding, cell signalling, in vivo cannabimimetic activity, clinical activity and pharmacokinetics. We give special focus to studies that directly compared Δ8 -THC to its more commonly studied isomer, Δ9 -THC. Overall, the pharmacokinetics and pharmacodynamics of Δ8 -THC and Δ9 -THC are very similar. Δ8 -THC is a partial agonist of the cannabinoid CB1 receptor and has cannabimimetic activity in both animals and humans. The reduced potency of Δ8 -THC in clinical studies compared with Δ9 -THC can be explained by weaker cannabinoid CB1 receptor affinity, although there are other plausible mechanisms that may contribute. We highlight the gaps in our knowledge of Δ8 -THC pharmacology where further studies are needed, particularly in humans.
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Affiliation(s)
| | - Linda E Klumpers
- Verdient Science LLC, Denver, Colorado.,Tomori Pharmacology Inc., Denver, Colorado, USA.,Department of Pharmacology, Larner College of Medicine, University of Vermont, Burlington, Vermont, USA.,Anebulo Pharmaceuticals Inc., Austin, Texas, USA
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5
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Aguillón AR, Leão RAC, Miranda LSM, de Souza ROMA. Cannabidiol Discovery and Synthesis-a Target-Oriented Analysis in Drug Production Processes. Chemistry 2021; 27:5577-5600. [PMID: 32780909 DOI: 10.1002/chem.202002887] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 08/07/2020] [Indexed: 01/13/2023]
Abstract
The current state of evidence and recommendations for cannabidiol (CBD) and its health effects change the legal landscape and aim to destigmatize its phytotherapeutic research. Recently, some countries have included CBD as an antiepileptic product for compassionate use in children with refractory epilepsy. The growing demand for CBD has led to the need for high-purity cannabinoids on the emerging market. The discovery and development of approaches toward CBD synthesis have arisen from the successful extraction of Cannabis plants for cannabinoid fermentation in brewer's yeast. To understand different contributions to the design and enhancement of the synthesis of CBD and its key intermediates, a detailed analysis of the history behind cannabinoid compounds and their optimization is provided herein.
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Affiliation(s)
- Anderson R Aguillón
- Biocatalysis and Organic Synthesis Group, Chemistry Institute, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-909, Brazil
| | - Raquel A C Leão
- Biocatalysis and Organic Synthesis Group, Chemistry Institute, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-909, Brazil.,Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro-RJ, 21941-170, CEP, 21941-910, Brazil
| | - Leandro S M Miranda
- Biocatalysis and Organic Synthesis Group, Chemistry Institute, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-909, Brazil
| | - Rodrigo O M A de Souza
- Biocatalysis and Organic Synthesis Group, Chemistry Institute, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-909, Brazil.,Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro-RJ, 21941-170, CEP, 21941-910, Brazil
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6
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Citti C, Russo F, Linciano P, Strallhofer SS, Tolomeo F, Forni F, Vandelli MA, Gigli G, Cannazza G. Origin of Δ 9-Tetrahydrocannabinol Impurity in Synthetic Cannabidiol. Cannabis Cannabinoid Res 2021; 6:28-39. [PMID: 33614950 DOI: 10.1089/can.2020.0021] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Introduction: Cannabidiol (CBD), the nonintoxicating constituent of cannabis, is largely employed for pharmaceutical and cosmetic purposes. CBD can be extracted from the plant or chemically synthesized. Impurities of psychotropic cannabinoids Δ9-tetrahydrocannabinol (Δ9-THC) and Δ8-THC have been found in extracted CBD, thus hypothesizing a possible contamination from the plant. Materials and Methods: In this study, synthetic and extracted CBD samples were analyzed by ultrahigh-performance liquid chromatography coupled to high-resolution mass spectrometry and the parameters that can be responsible of the conversion of CBD into THC were evaluated by an accelerated stability test. Results: In synthetic and extracted CBD no trace of THC species was detected. In contrast, CBD samples stored in the dark at room temperature on the benchtop for 3 months showed the presence of such impurities. Experiments carried out under inert atmosphere in the absence of humidity or carbon dioxide led to no trace of THC over time even at high temperature. Conclusions: The results suggested that the copresence of carbon dioxide and water from the air could be the key for creating the acidic environment responsible for the cyclization of CBD. These findings suggest that it might be appropriate to review the storage conditions indicated on the label of commercially available CBD.
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Affiliation(s)
- Cinzia Citti
- Mediteknology s.r.l. (CNR Spin-off Company), Lecce, Italy.,CNR NANOTEC-Institute of Nanotechnology, Lecce, Italy.,Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Fabiana Russo
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Pasquale Linciano
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Sarah Sylvana Strallhofer
- Department of Pharmaceutical Chemistry, Institute of Pharmaceutical Sciences, University of Graz, Graz, Austria
| | | | - Flavio Forni
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | | | | | - Giuseppe Cannazza
- CNR NANOTEC-Institute of Nanotechnology, Lecce, Italy.,Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
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7
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Citti C, Linciano P, Russo F, Luongo L, Iannotta M, Maione S, Laganà A, Capriotti AL, Forni F, Vandelli MA, Gigli G, Cannazza G. A novel phytocannabinoid isolated from Cannabis sativa L. with an in vivo cannabimimetic activity higher than Δ 9-tetrahydrocannabinol: Δ 9-Tetrahydrocannabiphorol. Sci Rep 2019; 9:20335. [PMID: 31889124 PMCID: PMC6937300 DOI: 10.1038/s41598-019-56785-1] [Citation(s) in RCA: 102] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 11/29/2019] [Indexed: 12/14/2022] Open
Abstract
(-)-Trans-Δ9-tetrahydrocannabinol (Δ9-THC) is the main compound responsible for the intoxicant activity of Cannabis sativa L. The length of the side alkyl chain influences the biological activity of this cannabinoid. In particular, synthetic analogues of Δ9-THC with a longer side chain have shown cannabimimetic properties far higher than Δ9-THC itself. In the attempt to define the phytocannabinoids profile that characterizes a medicinal cannabis variety, a new phytocannabinoid with the same structure of Δ9-THC but with a seven-term alkyl side chain was identified. The natural compound was isolated and fully characterized and its stereochemical configuration was assigned by match with the same compound obtained by a stereoselective synthesis. This new phytocannabinoid has been called (-)-trans-Δ9-tetrahydrocannabiphorol (Δ9-THCP). Along with Δ9-THCP, the corresponding cannabidiol (CBD) homolog with seven-term side alkyl chain (CBDP) was also isolated and unambiguously identified by match with its synthetic counterpart. The binding activity of Δ9-THCP against human CB1 receptor in vitro (Ki = 1.2 nM) resulted similar to that of CP55940 (Ki = 0.9 nM), a potent full CB1 agonist. In the cannabinoid tetrad pharmacological test, Δ9-THCP induced hypomotility, analgesia, catalepsy and decreased rectal temperature indicating a THC-like cannabimimetic activity. The presence of this new phytocannabinoid could account for the pharmacological properties of some cannabis varieties difficult to explain by the presence of the sole Δ9-THC.
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Affiliation(s)
- Cinzia Citti
- Mediteknology spin-off company of the National Council of Research (CNR), Via Arnesano, 73100, Lecce, Italy
- Institute of Nanotechnology of the National Council of Research (CNR NANOTEC), Via Monteroni, 73100, Lecce, Italy
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125, Modena, Italy
| | - Pasquale Linciano
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125, Modena, Italy
| | - Fabiana Russo
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125, Modena, Italy
| | - Livio Luongo
- Department of Experimental Medicine, Division of Pharmacology, Università della Campania "L. Vanvitelli", Via Santa Maria di Costantinopoli 16, 80138, Naples, Italy
| | - Monica Iannotta
- Department of Experimental Medicine, Division of Pharmacology, Università della Campania "L. Vanvitelli", Via Santa Maria di Costantinopoli 16, 80138, Naples, Italy
| | - Sabatino Maione
- Department of Experimental Medicine, Division of Pharmacology, Università della Campania "L. Vanvitelli", Via Santa Maria di Costantinopoli 16, 80138, Naples, Italy
| | - Aldo Laganà
- Institute of Nanotechnology of the National Council of Research (CNR NANOTEC), Via Monteroni, 73100, Lecce, Italy
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy
| | - Anna Laura Capriotti
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy
| | - Flavio Forni
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125, Modena, Italy
| | - Maria Angela Vandelli
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125, Modena, Italy
| | - Giuseppe Gigli
- Institute of Nanotechnology of the National Council of Research (CNR NANOTEC), Via Monteroni, 73100, Lecce, Italy
| | - Giuseppe Cannazza
- Institute of Nanotechnology of the National Council of Research (CNR NANOTEC), Via Monteroni, 73100, Lecce, Italy.
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125, Modena, Italy.
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8
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Alapafuja SO, Nikas SP, Ho TC, Tong F, Benchama O, Makriyannis A. Chain Substituted Cannabilactones with Selectivity for the CB2 Cannabinoid Receptor. Molecules 2019; 24:E3559. [PMID: 31581433 PMCID: PMC6804212 DOI: 10.3390/molecules24193559] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 09/25/2019] [Accepted: 09/27/2019] [Indexed: 11/21/2022] Open
Abstract
In earlier work, we reported a novel class of CB2 selective ligands namely cannabilactones. These compounds carry a dimethylheptyl substituent at C3, which is typical for synthetic cannabinoids. In the current study with the focus on the pharmacophoric side chain at C3 we explored the effect of replacing the C1'-gem-dimethyl group with the bulkier cyclopentyl ring, and, we also probed the chain's length and terminal carbon substitution with bromo or cyano groups. One of the analogs synthesized namely 6-[1-(1,9-dihydroxy-6-oxo-6H-benzo[c]chromen-3-yl) cyclopentyl] hexanenitrile (AM4346) has very high affinity (Ki = 4.9 nM) for the mouse CB2 receptor (mCB2) and 131-fold selectivity for that target over the rat CB1 (rCB1). The species difference in the affinities of AM4346 between the mouse (m) and the human (h) CB2 receptors is reduced when compared to our first-generation cannabilactones. In the cyclase assay, our lead compound was found to be a highly potent and efficacious hCB2 receptor agonist (EC50 = 3.7 ± 1.5 nM, E(max) = 89%). We have also extended our structure-activity relationship (SAR) studies to include biphenyl synthetic intermediates that mimic the structure of the phytocannabinoid cannabinodiol.
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Affiliation(s)
- Shakiru O Alapafuja
- Center for Drug Discovery and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, USA.
| | - Spyros P Nikas
- Center for Drug Discovery and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, USA.
| | - Thanh C Ho
- Center for Drug Discovery and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, USA.
| | - Fei Tong
- Center for Drug Discovery and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, USA.
| | - Othman Benchama
- Center for Drug Discovery and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, USA.
| | - Alexandros Makriyannis
- Center for Drug Discovery and Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115, USA.
- Department of Chemistry & Chemical Biology, Northeastern University, Boston, MA 02115, USA.
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9
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Straiker A, Dvorakova M, Zimmowitch A, Mackie K. Cannabidiol Inhibits Endocannabinoid Signaling in Autaptic Hippocampal Neurons. Mol Pharmacol 2018; 94:743-748. [PMID: 29669714 DOI: 10.1124/mol.118.111864] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 04/16/2018] [Indexed: 11/22/2022] Open
Abstract
Δ9-Tetrahydrocannabinol (THC) and cannabidiol (CBD) are two main cannabinoid constituents of marijuana and hashish. The pharmacology of Δ9-THC has been extensively studied, whereas our understanding of the pharmacology of CBD has remained limited, despite excitement in CBD's potential role in treating certain pediatric epilepsies and its reputation for attenuating some Δ9-THC-induced effects. It was established early on that CBD binds poorly to the orthosteric site of CB1 or CB2 cannabinoid receptors, and its actions were commonly attributed to other noncannabinoid receptor mechanisms. However, recent evidence suggests that CBD does indeed act at cannabinoid CB1 receptors as a negative allosteric modulator (NAM) of CB1 signaling. By altering the orthosteric signaling of a G protein-coupled receptor, allosteric modulators greatly increase the richness of G protein-coupled receptor pharmacology. We have recently surveyed candidate CB1 NAMs in autaptic hippocampal neurons, a well-characterized neuronal model of endogenous cannabinoid signaling, and have now tested CBD in this model. We find that although CBD has no direct effect on excitatory transmission, it does inhibit two forms of endogenous cannabinoid-mediated retrograde synaptic plasticity: depolarization-induced suppression of excitation and metabotropic suppression of excitation, while not affecting signaling via GABA-B receptors. These results are consistent with the recently described NAM activity of CBD and suggest interesting possible mechanisms for CBD's therapeutic actions.
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Affiliation(s)
- Alex Straiker
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana
| | - Michaela Dvorakova
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana
| | - Anaelle Zimmowitch
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana
| | - Ken Mackie
- Gill Center for Biomolecular Science, Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana
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10
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Bow EW, Rimoldi JM. The Structure-Function Relationships of Classical Cannabinoids: CB1/CB2 Modulation. PERSPECTIVES IN MEDICINAL CHEMISTRY 2016; 8:17-39. [PMID: 27398024 PMCID: PMC4927043 DOI: 10.4137/pmc.s32171] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 05/31/2016] [Accepted: 06/02/2016] [Indexed: 12/11/2022]
Abstract
The cannabinoids are members of a deceptively simple class of terpenophenolic secondary metabolites isolated from Cannabis sativa highlighted by (-)-Δ(9)-tetrahydrocannabinol (THC), eliciting distinct pharmacological effects mediated largely by cannabinoid receptor (CB1 or CB2) signaling. Since the initial discovery of THC and related cannabinoids, synthetic and semisynthetic classical cannabinoid analogs have been evaluated to help define receptor binding modes and structure-CB1/CB2 functional activity relationships. This perspective will examine the classical cannabinoids, with particular emphasis on the structure-activity relationship of five regions: C3 side chain, phenolic hydroxyl, aromatic A-ring, pyran B-ring, and cyclohexenyl C-ring. Cumulative structure-activity relationship studies to date have helped define the critical structural elements required for potency and selectivity toward CB1 and CB2 and, more importantly, ushered the discovery and development of contemporary nonclassical cannabinoid modulators with enhanced physicochemical and pharmacological profiles.
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Affiliation(s)
- Eric W. Bow
- Department of BioMolecular Sciences, Division of Medicinal Chemistry, School of Pharmacy, University of Mississippi, University, MS, USA
| | - John M. Rimoldi
- Department of BioMolecular Sciences, Division of Medicinal Chemistry, School of Pharmacy, University of Mississippi, University, MS, USA
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11
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Nikas SP, Sharma R, Paronis CA, Kulkarni S, Thakur GA, Hurst D, Wood JT, Gifford RS, Rajarshi G, Liu Y, Raghav JG, Guo JJ, Järbe TUC, Reggio PH, Bergman J, Makriyannis A. Probing the carboxyester side chain in controlled deactivation (-)-δ(8)-tetrahydrocannabinols. J Med Chem 2014; 58:665-81. [PMID: 25470070 PMCID: PMC4306527 DOI: 10.1021/jm501165d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
![]()
We
recently reported on a controlled deactivation/detoxification approach
for obtaining cannabinoids with improved druggability. Our design
incorporates a metabolically labile ester group at strategic positions
within the THC structure. We have now synthesized a series of (−)-Δ8-THC analogues encompassing a carboxyester group within the
3-alkyl chain in an effort to explore this novel cannabinergic chemotype
for CB receptor binding affinity, in vitro and in vivo potency and
efficacy, as well as controlled deactivation by plasma esterases.
We have also probed the chain’s polar characteristics with
regard to fast onset and short duration of action. Our lead molecule,
namely 2-[(6aR,10aR)-6a,7,10,10a-tetrahydro-1-hydroxy-6,6,9-trimethyl-6H-dibenzo[b,d]pyran-3-yl]-2-methyl-propanoic
acid 3-cyano-propyl ester (AM7438), showed picomolar affinity for
CB receptors and is deactivated by plasma esterases while the respective
acid metabolite is inactive. In further in vitro and in vivo experiments,
the compound was found to be a remarkably potent and efficacious CB1
receptor agonist with relatively fast onset/offset of action.
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Affiliation(s)
- Spyros P Nikas
- Center for Drug Discovery and Departments of Chemistry and Chemical Biology and Pharmaceutical Sciences, Northeastern University , Boston, Massachusetts 02115, United States
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12
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Sharma R, Nikas SP, Paronis CA, Wood JT, Halikhedkar A, Guo JJ, Thakur GA, Kulkarni S, Benchama O, Raghav JG, Gifford RS, Järbe TUC, Bergman J, Makriyannis A. Controlled-deactivation cannabinergic ligands. J Med Chem 2013; 56:10142-57. [PMID: 24286207 DOI: 10.1021/jm4016075] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We report an approach for obtaining novel cannabinoid analogues with controllable deactivation and improved druggability. Our design involves the incorporation of a metabolically labile ester group at the 2'-position on a series of (-)-Δ(8)-THC analogues. We have sought to introduce benzylic substituents α to the ester group which affect the half-lives of deactivation through enzymatic activity while enhancing the affinities and efficacies of individual ligands for the CB1 and CB2 receptors. The 1'-(S)-methyl, 1'-gem-dimethyl, and 1'-cyclobutyl analogues exhibit remarkably high affinities for both CB receptors. The novel ligands are susceptible to enzymatic hydrolysis by plasma esterases in a controllable manner, while their metabolites are inactive at the CB receptors. In further in vitro and in vivo experiments key analogues were shown to be potent CB1 receptor agonists and to exhibit CB1-mediated hypothermic and analgesic effects.
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Affiliation(s)
- Rishi Sharma
- Center for Drug Discovery and Departments of Chemistry and Chemical Biology and Pharmaceutical Sciences, Northeastern University , Boston, Massachusetts 02115, United States
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13
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Synthesis and characterization of a compact tricyclic resorcinol from (+)- and (-)-3-pinanol. Tetrahedron Lett 2012; 53:4636-4638. [PMID: 24052669 DOI: 10.1016/j.tetlet.2012.05.165] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Resorcinol derivatives are important building blocks in the synthesis of natural products and pharmaceutical compounds including cannabinoids. Here we describe the synthesis and the structural characterization of a key resorcinol which carries a fully restricted bridged bicyclic group. We also report a potential mechanism for the acid catalyzed condensation of (+)- or (-)-3-pinanol with 2,6-dimethoxyphenol. The synthesized resorcinol facilitates the development of novel conformationally restricted cannabinoid analogs.
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14
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Järbe TUC, Tai S, LeMay BJ, Nikas SP, Shukla VG, Zvonok A, Makriyannis A. AM2389, a high-affinity, in vivo potent CB1-receptor-selective cannabinergic ligand as evidenced by drug discrimination in rats and hypothermia testing in mice. Psychopharmacology (Berl) 2012; 220:417-26. [PMID: 21989802 PMCID: PMC3291515 DOI: 10.1007/s00213-011-2491-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Accepted: 09/03/2011] [Indexed: 11/24/2022]
Abstract
RATIONALE The endocannabinoid signaling system (ECS) has been targeted for developing novel therapeutics since ECS dysfunction has been implicated in various pathologies. Current focus is on chemical modifications of the hexahydrocannabinol (HHC) nabilone (Cesamet(®)). OBJECTIVE To characterize the novel, high-affinity cannabinoid receptor 1 (CB(1)R) HHC-ligand AM2389 [9β-hydroxy-3-(1-hexyl-cyclobut-1-yl)-hexahydrocannabinol in two rodent pre-clinical assays. MATERIALS AND METHODS CB(1)R mediation of AM2389-induced hypothermia in mice was evaluated with AM251, a CB(1)R-selective antagonist/inverse agonist. Additionally, two groups of rats discriminated the full cannabinergic aminoalkylindole AM5983 (0.18 and 0.56 mg/kg) from vehicle 20 min post-injection in a two-choice operant conditioning task motivated by 0.1% saccharin/water. Generalization/substitution tests were conducted with AM2389, AM5983, and Δ(9)-tetrahydrocannabinol (Δ(9)-THC). RESULTS Δ(9)-THC (30 mg/kg)-induced hypothermia exhibited a faster onset and shorter duration of action compared with AM2389 (0.1 and 0.3 mg/kg). AM251 (3 and 10 mg/kg) attenuated/blocked hypothermia induced by 0.3 mg/kg AM2389. In drug discrimination, the order of potency was AM2389 > AM5983 > Δ(9)-THC with ED(50) values of 0.0025, 0.0571, and 0.2635 mg/kg, respectively, in the low-dose condition. The corresponding ED(50) values in the high-dose condition were 0.0069, 0.1246, and 0.8438 mg/kg, respectively. Onset of the effects of AM2389 was slow with a protracted time-course; the functional, perceptual in vivo half-life was approximately 17 h. CONCLUSIONS This potent cannabinergic HHC exhibited a slow onset of action with a protracted time-course. The AM2389 chemotype appears well suited for further drug development, and AM2389 currently is used to probe behavioral consequences of sustained ECS activation.
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Affiliation(s)
- Torbjörn U. C. Järbe
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 116 Mugar Hall, 360 Huntington Ave, Boston, MA 02115, USA
| | - Sherrica Tai
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 116 Mugar Hall, 360 Huntington Ave, Boston, MA 02115, USA
| | - Brian J. LeMay
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 116 Mugar Hall, 360 Huntington Ave, Boston, MA 02115, USA
| | - Spyros P. Nikas
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 116 Mugar Hall, 360 Huntington Ave, Boston, MA 02115, USA
| | - Vidyanand G. Shukla
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 116 Mugar Hall, 360 Huntington Ave, Boston, MA 02115, USA
| | - Alexander Zvonok
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 116 Mugar Hall, 360 Huntington Ave, Boston, MA 02115, USA
| | - Alexandros Makriyannis
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 116 Mugar Hall, 360 Huntington Ave, Boston, MA 02115, USA
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Brogi S, Corelli F, Di Marzo V, Ligresti A, Mugnaini C, Pasquini S, Tafi A. Three-dimensional quantitative structure-selectivity relationships analysis guided rational design of a highly selective ligand for the cannabinoid receptor 2. Eur J Med Chem 2010; 46:547-55. [PMID: 21183257 DOI: 10.1016/j.ejmech.2010.11.034] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 10/22/2010] [Accepted: 11/19/2010] [Indexed: 10/18/2022]
Abstract
This paper describes a three-dimensional quantitative structure-selectivity relationships (3D-QSSR) study for selectivity of a series of ligands for cannabinoid CB1 and CB2 receptors. 3D-QSSR exploration was expected to provide design information for drugs with high selectivity toward the CB2 receptor. The proposed 3D computational model was performed by Phase and generated taking into account a number of structurally diverse compounds characterized by a wide range of selectivity index values. The model proved to be predictive, with r2 of 0.95 and Q2 of 0.63. In order to get prospective experimental validation, the selectivity of an external data set of 39 compounds reported in the literature was predicted. The correlation coefficient (r2=0.56) obtained on this unrelated test set provided evidence that the correlation shown by the model was not a chance result. Subsequently, we essayed the ability of our approach to help the design of new CB2-selective ligands. Accordingly, based on our interest in studying the cannabinergic properties of quinolones, the N-(adamantan-1-yl)-4-oxo-8-methyl-1-pentyl-1,4-dihydroquinoline-3-carboxamide (65) was considered as a potential synthetic target. The log(SI) value predicted by using our model was indicative of high CB2 selectivity for such a compound, thus spurring us to synthesize it and to evaluate its CB1 and CB2 receptor affinity. Compound 65 was found to be an extremely selective CB2 ligand as it displayed high CB2 affinity (Ki=4.9 nM), while being devoid of CB1 affinity (Ki>10,000 nM). The identification of a new selective CB2 receptor ligand lends support for the practicability of quantitative ligand-based selectivity models for cannabinoid receptors. These drug discovery tools might represent a valuable complementary approach to docking studies performed on homology models of the receptors.
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Affiliation(s)
- Simone Brogi
- Dipartimento Farmaco Chimico Tecnologico, Università degli Studi di Siena, Via Alcide de Gasperi 2, 53100 Siena, Italy
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16
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Nikas SP, Alapafuja SO, Papanastasiou I, Paronis CA, Shukla VG, Papahatjis DP, Bowman AL, Halikhedkar A, Han X, Makriyannis A. Novel 1',1'-chain substituted hexahydrocannabinols: 9β-hydroxy-3-(1-hexyl-cyclobut-1-yl)-hexahydrocannabinol (AM2389) a highly potent cannabinoid receptor 1 (CB1) agonist. J Med Chem 2010; 53:6996-7010. [PMID: 20925434 DOI: 10.1021/jm100641g] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In pursuit of a more detailed understanding of the structural requirements for the key side chain cannabinoid pharmacophore, we have extended our SAR to cover a variety of conformationally modified side chains within the 9-keto and 9-hydroxyl tricyclic structures. Of the compounds described here, those with a seven-atom long side chain substituted with a cyclopentyl ring at C1' position have very high affinities for both CB1 and CB2 (0.97 nM < K(i) < 5.25 nM), with no preference for either of the two receptors. However, presence of the smaller cyclobutyl group at the C1' position leads to an optimal affinity and selectivity interaction with CB1. Thus, two of the C1'-cyclobutyl analogues, namely, (6aR,10aR)-3-(1-hexyl-cyclobut-1-yl)-6,6a,7,8,10,10a-hexahydro-1-hydroxy-6,6-dimethyl-9H-dibenzo[b,d]pyran-9-one and (6aR,9R,10aR)-3-(1-hexyl-cyclobut-1-yl)-6a,7,8,9,10,10a-hexahydro-6,6-dimethyl-6H-dibenzo[b,d]pyran-1,9 diol (7e-β, AM2389), exhibited remarkably high affinities (0.84 and 0.16 nM, respectively) and significant selectivities (16- and 26-fold, respectively) for CB1. Compound 7e-β was found to exhibit exceptionally high in vitro and in vivo potency with a relatively long duration of action.
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Affiliation(s)
- Spyros P Nikas
- Center for Drug Discovery, Northeastern University, 116 Mugar Life Sciences Building, 360 Huntington Avenue, Boston, Massachusetts 02115, USA.
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17
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Dixon DD, Sethumadhavan D, Benneche T, Banaag AR, Tius MA, Thakur GA, Bowman A, Wood JT, Makriyannis A. Heteroadamantyl cannabinoids. J Med Chem 2010; 53:5656-66. [PMID: 20593789 DOI: 10.1021/jm100390h] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The aliphatic side chain plays a pivotal role in determining the cannabinergic potency of tricyclic classical cannabinoids. We have synthesized a series of analogues in which the C3 position is substituted either directly or through a one-carbon atom linker with an adamantylamine or with an oxa- or an oxazaadamantane. The oxaadamantane pharmacophore in analogue 16 showed the best binding profile for both receptors.
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Affiliation(s)
- Darryl D Dixon
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
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18
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Thakur GA, Tichkule R, Bajaj S, Makriyannis A. Latest advances in cannabinoid receptor agonists. Expert Opin Ther Pat 2010; 19:1647-73. [PMID: 19939187 DOI: 10.1517/13543770903436505] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
BACKGROUND Since the discovery of cannabinoid receptors and their endogenous ligands in early 1990s, the endocannabinoid system has been shown to play a vital role in several pathophysiological processes. It has been targeted for the treatment of several diseases including neurodegenerative diseases (Parkinson's disease, Alzheimer's disease, Huntington's disease and MS), cancer, obesity, inflammatory bowel disease, neuropathic and inflammatory pain. The last decade has witnessed remarkable advances in the development of cannabinergic ligands displaying high selectivity and potency towards two subtypes of cannabinoid receptors, namely CB1 and CB2. OBJECTIVE In this review, we highlight the latest advances made in the development of cannabinoid agonists and summarize recently disclosed, novel chemical scaffolds as CB-selective agonists in patents that appeared during January 2008 - June 2009. METHODS Data presented here are obtained through the search of PubMed for research articles and reviews, and the website of European patents (http://ep.espacenet.com), SciFinder Scholar and US patents (www.uspto.gov). CONCLUSIONS Our analysis reveals prolific patenting activity mainly in the CB2 selective agonist area. Limiting the BBB penetrability, thereby, leading to peripherally restricted CB1/CB2 agonists and enhancing CB2-selectivity emerge as likely prerequisites for avoidance of adverse central CB1 mediated side effects.
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Affiliation(s)
- Ganesh A Thakur
- Northeastern University, Center for Drug Discovery, 116 Mugar Hall, Boston, MA 02115, USA.
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19
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Durdagi S, Papadopoulos MG, Papahatjis DP, Mavromoustakos T. Combined 3D QSAR and molecular docking studies to reveal novel cannabinoid ligands with optimum binding activity. Bioorg Med Chem Lett 2007; 17:6754-63. [DOI: 10.1016/j.bmcl.2007.10.044] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2007] [Revised: 10/11/2007] [Accepted: 10/13/2007] [Indexed: 11/28/2022]
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20
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Papahatjis DP, Nahmias VR, Nikas SP, Andreou T, Alapafuja SO, Tsotinis A, Guo J, Fan P, Makriyannis A. C1‘-Cycloalkyl Side Chain Pharmacophore in Tetrahydrocannabinols. J Med Chem 2007; 50:4048-60. [PMID: 17672444 DOI: 10.1021/jm070121a] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In earlier work we have provided evidence for the presence of a subsite within the CB1 and CB2 cannabinoid receptor binding domains of classical cannabinoids. This putative subsite corresponds to substituents on the C1'-position of the C3-alkyl side chain, a key pharmacophoric feature in this class of compounds. We have now refined this work through the synthesis of additional C1'-cycloalkyl compounds using newly developed approaches. Our findings indicate that the C1'-cyclopropyl and C1'-cyclopentyl groups are optimal pharmacophores for both receptors while the C1'-cyclobutyl group interacts optimally with CB1 but not with CB2. The C1'-cyclohexyl analogs have reduced affinities for both CB1 and CB2. However, these affinities are significantly improved with the introduction of a C2'-C3' cis double bond that modifies the available conformational space within the side chain and allows for a better accommodation of a six-membered ring within the side chain subsite. Our SAR results are highlighted by molecular modeling of key analogs.
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Affiliation(s)
- Demetris P Papahatjis
- Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vass. Constantinou, Athens 116-35 Greece.
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21
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Abstract
Over the past 50 years, a considerable research in medicinal chemistry has been carried out around the natural constituents of Cannabis sativa L. Following the identification of Delta9-tetrahydrocannabinol (Delta9-THC) in 1964, critical chemical modifications, e.g., variation of the side chain at C3 and the opening of the tricyclic scaffold, have led to the characterization of potent and cannabinoid receptor subtype-selective ligands. Those ligands that demonstrate high affinity for the cannabinoid receptors and good biological efficacy are still used as powerful pharmacological tools. This review summarizes past as well as recent developments in the structure-activity relationships of phytocannabinoids.
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Affiliation(s)
- Eric Stern
- Drug Design and Discovery Center and Unité de Chimie pharmaceutique et de Radiopharmacie, Ecole de Pharmacie, Faculté de Médecine, Université catholique de Louvain, Avenue E. Mounier 73, U.C.L. 73.40, B-1200 Bruxelles
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22
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Durdagi S, Kapou A, Kourouli T, Andreou T, Nikas SP, Nahmias VR, Papahatjis DP, Papadopoulos MG, Mavromoustakos T. The Application of 3D-QSAR Studies for Novel Cannabinoid Ligands Substituted at the C1‘ Position of the Alkyl Side Chain on the Structural Requirements for Binding to Cannabinoid Receptors CB1 and CB2. J Med Chem 2007; 50:2875-85. [PMID: 17521177 DOI: 10.1021/jm0610705] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A set of 30 novel Delta8-tetrahydrocannabinol and cannabidiol analogues were subjected to three-dimensional quantitative structure-activity relationship studies using the comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA) approaches. Using a combination of molecular modeling techniques and NMR spectroscopy, the putative bioactive conformation of the most potent cannabinoid (CB) ligand in the training set was determined. This conformer was used as the template and CB1 and CB2 pharmacophore models were developed. These models were fitted with experimental binding data and gave high correlation coefficients. Contour maps of the CB1 and CB2 models of CoMFA and CoMSIA approaches show that steric effects dominantly determine the binding affinities. The CoMFA and CoMSIA analyses based on the binding affinity data of CB ligands at the CB1 and CB2 receptors allowed us to deduce the possible optimal binding positions. This information can be used for the design of new CB analogues with enhanced activity and other tailored properties.
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Affiliation(s)
- Serdar Durdagi
- Institute of Organic and Pharmaceutical Chemistry, The National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece
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23
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Biaryl cannabinoid mimetics--synthesis and structure-activity relationship. Bioorg Med Chem Lett 2007; 17:3652-6. [PMID: 17507224 DOI: 10.1016/j.bmcl.2007.04.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2007] [Revised: 04/10/2007] [Accepted: 04/16/2007] [Indexed: 10/23/2022]
Abstract
Synthesis, in vitro biological evaluation, and structure-activity relationships of a biaryl cannabinoid mimetic 2 are reported. Variations in the substitution pattern yielded a number of agonists with low nanomolar affinity. Replacing the phenol group by a methyl morpholino acetate group led to compound 28, a 500-fold selective CB(2) receptor agonist.
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24
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Papahatjis DP, Nahmias VR, Andreou T, Fan P, Makriyannis A. Structural modifications of the cannabinoid side chain towards C3-aryl and 1',1'-cycloalkyl-1'-cyano cannabinoids. Bioorg Med Chem Lett 2006; 16:1616-20. [PMID: 16387492 DOI: 10.1016/j.bmcl.2005.12.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2005] [Revised: 11/29/2005] [Accepted: 12/07/2005] [Indexed: 11/29/2022]
Abstract
The compounds reported in this study are Delta(8)-THC analogues in which the C3 five-carbon linear side chain of Delta(8)-THC was replaced with aryl and 1',1'-cycloalkyl substituents. Of the compounds described here analogues 2d (CB(1), K(i)=11.7 nM. CB(2), K(i)=9.39 nM) and 2f (CB(1), K(i)=8.26 nM. CB(2), K(i)=3.86 nM) exhibited enhanced binding affinities for CB(1) and CB(2), exceeding that of Delta(8)-THC. Efficient procedures for the synthesis of these novel cannabinoid analogues are described.
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Affiliation(s)
- Demetris P Papahatjis
- Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vass. Constantinou, Athens 116-35, Greece.
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25
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Adam J, Cowley PM, Kiyoi T, Morrison AJ, Mort CJW. Recent progress in cannabinoid research. PROGRESS IN MEDICINAL CHEMISTRY 2006; 44:207-329. [PMID: 16697899 DOI: 10.1016/s0079-6468(05)44406-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Affiliation(s)
- Julia Adam
- Organon Research, Newhouse, Lanarkshire, Scotland, UK
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26
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Abstract
Mammalian tissues express at least two types of cannabinoid receptor, CB1 and CB2, both G protein coupled. CB1 receptors are expressed predominantly at nerve terminals where they mediate inhibition of transmitter release. CB2 receptors are found mainly on immune cells, one of their roles being to modulate cytokine release. Endogenous ligands for these receptors (endocannabinoids) also exist. These are all eicosanoids; prominent examples include arachidonoylethanolamide (anandamide) and 2-arachidonoyl glycerol. These discoveries have led to the development of CB1- and CB2-selective agonists and antagonists and of bioassays for characterizing such ligands. Cannabinoid receptor antagonists include the CB1-selective SR141716A, AM251, AM281 and LY320135, and the CB2-selective SR144528 and AM630. These all behave as inverse agonists, one indication that CB1 and CB2 receptors can exist in a constitutively active state. Neutral cannabinoid receptor antagonists that seem to lack inverse agonist properties have recently also been developed. As well as acting on CB1 and CB2 receptors, there is convincing evidence that anandamide can activate transient receptor potential vanilloid type 1 (TRPV1) receptors. Certain cannabinoids also appear to have non-CB1, non-CB2, non-TRPV1 targets, for example CB2-like receptors that can mediate antinociception and "abnormal-cannabidiol" receptors that mediate vasorelaxation and promote microglial cell migration. There is evidence too for TRPV1-like receptors on glutamatergic neurons, for alpha2-adrenoceptor-like (imidazoline) receptors at sympathetic nerve terminals, for novel G protein-coupled receptors for R-(+)-WIN55212 and anandamide in the brain and spinal cord, for novel receptors for delta9-tetrahydrocannabinol and cannabinol on perivascular sensory nerves and for novel anandamide receptors in the gastro-intestinal tract. The presence of allosteric sites for cannabinoids on various ion channels and non-cannabinoid receptors has also been proposed. In addition, more information is beginning to emerge about the pharmacological actions of the non-psychoactive plant cannabinoid, cannabidiol. These recent advances in cannabinoid pharmacology are all discussed in this review.
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MESH Headings
- Animals
- Biological Assay
- Cannabinoids/pharmacology
- Humans
- Ligands
- Receptor, Cannabinoid, CB1/classification
- Receptor, Cannabinoid, CB1/drug effects
- Receptor, Cannabinoid, CB1/physiology
- Receptor, Cannabinoid, CB2/drug effects
- Receptor, Cannabinoid, CB2/physiology
- TRPV Cation Channels/drug effects
- TRPV Cation Channels/physiology
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Affiliation(s)
- R G Pertwee
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, UK.
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Thakur GA, Duclos RI, Makriyannis A. Natural cannabinoids: templates for drug discovery. Life Sci 2005; 78:454-66. [PMID: 16242157 DOI: 10.1016/j.lfs.2005.09.014] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2005] [Indexed: 01/09/2023]
Abstract
Recent studies have elucidated the biosynthetic pathway of cannabinoids and have highlighted the preference for a C-3 n-pentyl side chain in the most prominently represented cannabinoids from Cannabis sativa and their medicinally important decarboxylation products. The corresponding C-3 n-propyl side chain containing cannabinoids are also found, although in lesser quantities. Structure-activity relationship (SAR) studies performed on Delta(9)-tetrahydrocannabinol (Delta(9)-THC), the key psychoactive ingredient of Cannabis, and its synthetic analogues have identified the C-3 side chain as the key pharmacophore for ligand affinity and selectivity for the known cannabinoid receptors and for pharmacological potency. Interestingly, the terminal n-pentyl saturated hydrocarbon side chain of endocannabinoids also plays a corresponding crucial role in conferring similar properties. This review briefly summarizes the biosynthesis of cannabinoids and endocannabinoids and focuses on their side chain SAR.
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Affiliation(s)
- Ganesh A Thakur
- Center for Drug Discovery, Northeastern University, 360 Huntington Avenue, 116 Mugar Life Sciences Building, Boston, MA 02115, USA
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28
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Antoniou K, Galanopoulos A, Vlachou S, Kourouli T, Nahmias V, Thermos K, Panagis G, Daifoti Z, Marselos M, Papahatjis D, Spyraki C. Behavioral pharmacological properties of a novel cannabinoid 1???,1???-dithiolane ??8-THC analog, AMG-3. Behav Pharmacol 2005; 16:499-510. [PMID: 16148456 DOI: 10.1097/00008877-200509000-00024] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Newly developed cannabinoids may hold the promise of the development of useful and safe drugs. This study aimed to investigate the behavioral effects of the novel 1',1'-dithiolane delta8-HC analogue AMG-3, a cannabinomimetic molecule with high affinity for CB1/CB2 receptors. This analog was chosen for its binding affinity to these receptors, which is higher than that reported for delta8-tetrahydrocannabinol (delta8-THC). Behavioral responses were assessed after the administration of AMG-3 (1, 2, 4, 8 mg/kg, i.p.) in the open field, on the bar test, on the hot plate and in the intracranial self-stimulation procedure. AMG-3 increased the reactivity time on the hot plate in a dose- and time-dependent manner, indicating a long-lasting analgesic effect (at least 24 h). The substance was found dose-dependently to decrease spontaneous motor activity and to induce catalepsy, particularly at the highest dose (8 mg/kg). AMG-3 did not affect the rewarding value of intracranial self-stimulation, except to increase the reward threshold at the highest dose (8 mg/kg). The effects of the highest dose of AMG-3 on spontaneous activity and on the self-stimulation paradigm were completely reversed by pre-treatment with the CB1 receptor antagonist AM-251. These findings indicate that the administration of AMG-3 to rats elicits a specific behavioral profile, most probably associated with the activation of CB1 receptors and without effects indicating abuse potential.
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MESH Headings
- Animals
- Behavior, Animal/drug effects
- Behavior, Animal/physiology
- Binding, Competitive/drug effects
- Cannabinoids/chemistry
- Cannabinoids/pharmacology
- Catalepsy/chemically induced
- Catalepsy/physiopathology
- Cell Membrane/drug effects
- Cell Membrane/metabolism
- Cerebral Cortex/drug effects
- Cerebral Cortex/metabolism
- Cyclohexanols/metabolism
- Dose-Response Relationship, Drug
- Male
- Molecular Structure
- Motor Activity/drug effects
- Pain/physiopathology
- Pain/prevention & control
- Pain Measurement/methods
- Piperidines/pharmacology
- Pyrazoles/pharmacology
- Rats
- Rats, Sprague-Dawley
- Receptor, Cannabinoid, CB1/agonists
- Receptor, Cannabinoid, CB1/antagonists & inhibitors
- Receptor, Cannabinoid, CB1/physiology
- Time Factors
- Tritium
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Affiliation(s)
- K Antoniou
- Department of Pharmacology, Medical School, University of Ioannina, 45110 Ioannina, Greece.
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29
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Lu D, Meng Z, Thakur GA, Fan P, Steed J, Tartal CL, Hurst DP, Reggio PH, Deschamps JR, Parrish DA, George C, Järbe TUC, Lamb RJ, Makriyannis A. Adamantyl cannabinoids: a novel class of cannabinergic ligands. J Med Chem 2005; 48:4576-85. [PMID: 15999995 DOI: 10.1021/jm058175c] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Structure-activity relationship studies have established that the aliphatic side chain plays a pivotal role in determining the cannabinergic potency of tricyclic classical cannabinoids. We have now synthesized a series of analogues in which a variety of adamantyl substituents were introduced at the C3 position of Delta(8)-THC. Our lead compound, (-)-3-(1-adamantyl)-Delta(8)-tetrahydrocannabinol (1a, AM411), was found to have robust affinity and selectivity for the CB1 receptor as well as high in vivo potency. The X-ray crystal structure of 1a was determined. Exploration of the side chain conformational space using molecular modeling approaches has allowed us to develop cannabinoid side chain pharmacophore models for the CB1 and CB2 receptors. Our results suggest that although a bulky group at the C3 position of classical cannabinoids could be tolerated by both CB1 and CB2 binding sites, the relative orientation of that group with respect to the tricyclic component can lead to receptor subtype selectivity.
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MESH Headings
- Adamantane/analogs & derivatives
- Adamantane/chemical synthesis
- Adamantane/chemistry
- Adamantane/pharmacology
- Animals
- Brain/metabolism
- Computer Simulation
- Crystallography, X-Ray
- Discrimination Learning/drug effects
- Dronabinol/chemical synthesis
- Dronabinol/chemistry
- Dronabinol/pharmacology
- In Vitro Techniques
- Ligands
- Male
- Models, Molecular
- Molecular Conformation
- Protein Conformation
- Radioligand Assay
- Rats
- Rats, Sprague-Dawley
- Receptor, Cannabinoid, CB1/agonists
- Receptor, Cannabinoid, CB1/chemistry
- Receptor, Cannabinoid, CB1/metabolism
- Receptor, Cannabinoid, CB2/chemistry
- Receptor, Cannabinoid, CB2/drug effects
- Receptor, Cannabinoid, CB2/metabolism
- Structure-Activity Relationship
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Affiliation(s)
- Dai Lu
- Center for Drug Discovery, Northeastern University, 116 Mugar Life Sciences Building, Boston, Massachusetts 02115, USA
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Abstract
Over the past 40 years, much research has been carried out directed toward the characterization of the cannabinergic system. With the identification of two G-protein coupled receptors and the endogenous ligand, anandamide, pharmacological targets have expanded to encompass hydrolase and transport proteins as well as novel classes of cannabinoid ligands. Those ligands that demonstrate high affinity for the receptors and good biological efficacy are tied together through lipophilic regions repeatedly demonstrated necessary for activity. This review presents recent developments in the structure-activity relationships of several classes of cannabinoid ligands.
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Affiliation(s)
- Lea W Padgett
- Howard L. Hunter Chemistry Laboratory, Clemson University, Clemson, SC 29634-0973, USA.
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31
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Thakur GA, Nikas SP, Li C, Makriyannis A. Structural requirements for cannabinoid receptor probes. Handb Exp Pharmacol 2005:209-46. [PMID: 16596776 DOI: 10.1007/3-540-26573-2_7] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The discovery and cloning of CB1 and CB2, the two known G(i/o) protein-coupled cannabinoid receptors, as well as the isolation and characterization of two families of endogenous cannabinergic ligands represented by arachidonoylethanolamide (anandamide) and 2-arachidonoylglycerol (2-AG), have opened new horizons in this newly discovered field of biology. Furthermore, a considerable number of cannabinoid analogs belonging to structurally diverse classes of compounds have been synthesized and tested, thus providing substantial information on the structural requirements for cannabinoid receptor recognition and activation. Experiments with site-directed mutated receptors and computer modeling studies have suggested that these diverse classes of ligands may interact with the receptors through different binding motifs. The information about the exact binding site may be obtained with the help of suitably designed molecular probes. These ligands either interact with the receptors in a reversible fashion (reversible probes) or alternatively attach at or near the receptor active site with the formation of covalent bonds (irreversible probes). This review focuses on structural requirements of cannabinoid receptor ligands and highlights their pharmacological and therapeutic potential.
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Affiliation(s)
- G A Thakur
- Center for Drug Discovery, Department of Pharmaceutical Sciences, University of Connecticut, Storrs, CT 06269, USA
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32
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Nikas SP, Grzybowska J, Papahatjis DP, Charalambous A, Banijamali AR, Chari R, Fan P, Kourouli T, Lin S, Nitowski AJ, Marciniak G, Guo Y, Li X, Wang CLJ, Makriyannis A. The role of halogen substitution in classical cannabinoids: a CB1 pharmacophore model. AAPS JOURNAL 2004; 6:e30. [PMID: 15760095 PMCID: PMC2751226 DOI: 10.1208/aapsj060430] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The presence of halogens within the classical cannabinoid structure leads to large variations in the compounds' potencies and affinities for the CB1 receptors. To explore the structure activity relationships within this class of analogs we have used a series of halogen-substituted (-)-Delta8-tetrahydrocannabinol analogs and compared their affinities for the CB1 cannabinoid receptor. Our results indicate that halogen substitution at the end-carbon of the side chain leads to an enhancement in affinity with the bulkier halogens (Br, I) producing the largest effects. Conversely, 2-iodo substitution on the phenolic ring leads to a 2-fold reduction in affinity while iodo-substitution in the C1'-position of the side chain lowers the compound's affinity for CB1 by more than 8-fold. The pharmacophoric requirements resulting from halogen-substitution are explored using computer modeling methods.
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Affiliation(s)
- Spyros P. Nikas
- />Departments of Pharmaceutical Sciences and Molecular and Cell Biology and Center for Drug Discovery, University of Connecticut, 372 Fairfield Road, 06269 Storrs, CT
| | - Jolanta Grzybowska
- />Departments of Pharmaceutical Sciences and Molecular and Cell Biology and Center for Drug Discovery, University of Connecticut, 372 Fairfield Road, 06269 Storrs, CT
| | - Demetris P. Papahatjis
- />Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vass Constantinou, 116-35 Athens, Greece
| | - Avgui Charalambous
- />Departments of Pharmaceutical Sciences and Molecular and Cell Biology and Center for Drug Discovery, University of Connecticut, 372 Fairfield Road, 06269 Storrs, CT
| | - Ali R. Banijamali
- />Departments of Pharmaceutical Sciences and Molecular and Cell Biology and Center for Drug Discovery, University of Connecticut, 372 Fairfield Road, 06269 Storrs, CT
- />Crompton Corp, 06749 Middlebury, CT
| | - Ravi Chari
- />Departments of Pharmaceutical Sciences and Molecular and Cell Biology and Center for Drug Discovery, University of Connecticut, 372 Fairfield Road, 06269 Storrs, CT
| | - Pusheng Fan
- />Departments of Pharmaceutical Sciences and Molecular and Cell Biology and Center for Drug Discovery, University of Connecticut, 372 Fairfield Road, 06269 Storrs, CT
| | - Therapia Kourouli
- />Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vass Constantinou, 116-35 Athens, Greece
| | - Sonyuan Lin
- />Departments of Pharmaceutical Sciences and Molecular and Cell Biology and Center for Drug Discovery, University of Connecticut, 372 Fairfield Road, 06269 Storrs, CT
| | | | - Gilbert Marciniak
- />Departments of Pharmaceutical Sciences and Molecular and Cell Biology and Center for Drug Discovery, University of Connecticut, 372 Fairfield Road, 06269 Storrs, CT
| | - Yan Guo
- />Departments of Pharmaceutical Sciences and Molecular and Cell Biology and Center for Drug Discovery, University of Connecticut, 372 Fairfield Road, 06269 Storrs, CT
| | - Xiuyan Li
- />Departments of Pharmaceutical Sciences and Molecular and Cell Biology and Center for Drug Discovery, University of Connecticut, 372 Fairfield Road, 06269 Storrs, CT
| | | | - Alexandros Makriyannis
- />Departments of Pharmaceutical Sciences and Molecular and Cell Biology and Center for Drug Discovery, University of Connecticut, 372 Fairfield Road, 06269 Storrs, CT
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33
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Ferreira AM, Moore BM, Krishnamurthy M. Theoretical analysis of the NMR and electronic structure of novel Δ8-THC derivatives. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.theochem.2003.12.052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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34
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Krishnamurthy M, Ferreira AM, Moore BM. Synthesis and testing of novel phenyl substituted side-Chain analogues of classical cannabinoids. Bioorg Med Chem Lett 2003; 13:3487-90. [PMID: 14505654 DOI: 10.1016/s0960-894x(03)00729-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A series of novel phenyl substituted side-chain analogues of classical cannabinoids were synthesized and their CB1 and CB2 binding affinities were evaluated relative to Delta(8)-THC and compound 2. CB1 and CB2 binding assays indicate that the dimethyl and ketone analogues (3) and (6) display selectivity for the CB2 receptor in comparison to delta(8)-THC and compound 2. This study provides newer insights into the geometrical and functional group requirements of the ligand binding pockets of the CB1 and the CB2 receptors.
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Affiliation(s)
- Mathangi Krishnamurthy
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee-Memphis, Memphis, TN 38163, USA
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35
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Papahatjis DP, Nikas SP, Kourouli T, Chari R, Xu W, Pertwee RG, Makriyannis A. Pharmacophoric requirements for the cannabinoid side chain. Probing the cannabinoid receptor subsite at C1'. J Med Chem 2003; 46:3221-9. [PMID: 12852753 DOI: 10.1021/jm020558c] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Earlier work from our laboratories has provided evidence for the existence of a subsite within the CB1 and CB2 cannabinoid receptor binding domain corresponding to substituents at the benzylic side chain position of classical cannabinoids. The existence and stereochemical features of this subsite have now been probed through the synthesis of a novel series of (-)-Delta(8)-tetrahydrocannabinol analogues bearing C1'-ring substituents. Of the compounds described here, those with C1'-dithiolane (1c), C1'-dioxolane (2d), and cyclopentyl (2a) substituents exhibited the highest affinities for CB1 and CB2. We used molecular modeling approaches to better define the stereochemical limits of the putative subsite. In vitro pharmacological testing found 1c to be a potent CB1 agonist.
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Affiliation(s)
- Demetris P Papahatjis
- Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vass. Constantinou, Athens 116-35 Greece.
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36
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Nadipuram AK, Krishnamurthy M, Ferreira AM, Li W, Moore BM. Synthesis and testing of novel classical cannabinoids: exploring the side chain ligand binding pocket of the CB1 and CB2 receptors. Bioorg Med Chem 2003; 11:3121-32. [PMID: 12818675 DOI: 10.1016/s0968-0896(03)00238-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
A series of C3 cyclic side-chain analogues of classical cannabinoids were synthesized to probe the ligand binding pocket of the CB1 and CB2 receptors. The analogues were evaluated for CB1 and CB2 receptor binding affinities relative to delta(8)-THC. The C3 side-chain geometries of the analogues were studied using high field NMR spectroscopy and quantum mechanical calculations. The results of these studies provide insights into the geometry of the ligand binding pocket of the CB1 and CB2 receptors.
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MESH Headings
- Animals
- Binding Sites
- Cannabinoids/chemical synthesis
- Cannabinoids/metabolism
- Cell Membrane/metabolism
- Humans
- Ligands
- Magnetic Resonance Spectroscopy
- Models, Molecular
- Protein Binding
- Quantum Theory
- Receptor, Cannabinoid, CB1/chemistry
- Receptor, Cannabinoid, CB1/metabolism
- Receptor, Cannabinoid, CB2/chemistry
- Receptor, Cannabinoid, CB2/metabolism
- Receptors, Cannabinoid/metabolism
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Affiliation(s)
- Asha K Nadipuram
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee-Memphis, Memphis, TN 38103, USA
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