Miquel Martin1,2, Miriam Gutiérrez-Martos2, Roberto Cabrera2, Klaus Langohr1,3, Rafael Maldonado2,4, Magi Farre1,5,6, Rafael de la Torre7,8,9. 1. Integrative Pharmacology and Systems Neuroscience Research Group, Hospital del Mar Medical Research Institute (IMIM), Parc de Recerca Biomedica de Barcelona (PRBB), C/Dr. Aiguader 88, 08003, Barcelona, Spain. 2. Laboratory of Neuropharmacology, Parc de Recerca Biomedica de Barcelona (PRBB), Universitat Pompeu Fabra, C/Dr. Aiguader 88, 08003, Barcelona, Spain. 3. Department of Statistics and Operations Research, Universitat Politècnica de Cataluña (UPC)/BarcelonaTech, Jordi Girona 1-3, 08034, Barcelona, Spain. 4. Universitat Pompeu Fabra (CEXS-UPF), C/Dr. Aiguader 88, 08003, Barcelona, Spain. 5. Universitat Autònoma de Barcelona (UDIMAS-UAB), C/Dr. Aiguader 88, 08003, Barcelona, Spain. 6. Clinical Pharmacology Unit, Hospital Universitari Germans Trias i Pujol (IGTP), Carretera de Canyet s/n, 08916, Badalona, Spain. 7. Integrative Pharmacology and Systems Neuroscience Research Group, Hospital del Mar Medical Research Institute (IMIM), Parc de Recerca Biomedica de Barcelona (PRBB), C/Dr. Aiguader 88, 08003, Barcelona, Spain. RTorre@imim.es. 8. Universitat Pompeu Fabra (CEXS-UPF), C/Dr. Aiguader 88, 08003, Barcelona, Spain. RTorre@imim.es. 9. CIBER Fisiopatologia de la Obesidad y la Nutrición (CIBERobn), Choupana s, /n 15706, Santiago de Compostela, Spain. RTorre@imim.es.
Abstract
RATIONALE: Cocaine addiction is a chronic relapsing disorder that lacks of an effective treatment. Isoflavones are a family of compounds present in different plants and vegetables like soybeans that share a common chemical structure. Previous studies have described that synthetic derivatives from the natural isoflavone daidzin can modulate cocaine addiction, by a mechanism suggested to involve aldehyde-dehydrogenase (ALDH) activities. OBJECTIVES: Based on these previous studies, we investigated the effects of three natural isoflavones, daidzin, daidzein, and genistein, on the modulation of the cocaine reinforcing effects and on cue-induced reinstatement in an operant mouse model of cocaine self-administration. RESULTS: Chronic treatment with daidzein or genistein decreased operant responding to obtain cocaine intravenous infusions. On the other hand, daidzein and daidzin, but not genistein, were effective in decreasing cue-induced cocaine reinstatement. Complementary studies revealed that daidzein effects on cocaine reinforcement were mediated through a mechanism that involved dopamine type-2/3 receptors (DA-D2/3) activities. CONCLUSIONS: Our results suggest that these natural compounds alone or in combination can be a potential therapeutic approach for cocaine addiction. Further clinical studies are required in order to ascertain their potential therapeutic use.
RATIONALE: Cocaine addiction is a chronic relapsing disorder that lacks of an effective treatment. Isoflavones are a family of compounds present in different plants and vegetables like soybeans that share a common chemical structure. Previous studies have described that synthetic derivatives from the natural isoflavonedaidzin can modulate cocaine addiction, by a mechanism suggested to involve aldehyde-dehydrogenase (ALDH) activities. OBJECTIVES: Based on these previous studies, we investigated the effects of three natural isoflavones, daidzin, daidzein, and genistein, on the modulation of the cocaine reinforcing effects and on cue-induced reinstatement in an operant mouse model of cocaine self-administration. RESULTS: Chronic treatment with daidzein or genistein decreased operant responding to obtain cocaine intravenous infusions. On the other hand, daidzein and daidzin, but not genistein, were effective in decreasing cue-induced cocaine reinstatement. Complementary studies revealed that daidzein effects on cocaine reinforcement were mediated through a mechanism that involved dopamine type-2/3 receptors (DA-D2/3) activities. CONCLUSIONS: Our results suggest that these natural compounds alone or in combination can be a potential therapeutic approach for cocaine addiction. Further clinical studies are required in order to ascertain their potential therapeutic use.
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