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Acree L. Endogenous and Exogenous Opioids: Role in Substance Use Disorders. ADVANCES IN NEUROBIOLOGY 2024; 35:267-285. [PMID: 38874728 DOI: 10.1007/978-3-031-45493-6_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2024]
Abstract
Opioid use disorders have become an epidemic in recent years with rates nearly quadrupling since 1999 according to the US Centers for Disease Control and Prevention (Centers for Disease Control, Wide-ranging online data for epidemiologic research (WONDER). CDC, National Center for Health Statistics, Atlanta. Retrieved December 19, 2017, from http://wonder.cdc.gov, 2016). To understand substance use disorder (SUD) as a disease, many aspects must be studied including the circuitry in the brain, adaptations to neuronal circuitry and neurotransmitters, genetic variations increasing the risk for SUD, and treatments available for SUD. The mechanism in which an exogenous opioid may cause SUD is nearly identical to the mechanism of an endogenous opioid. This chapter reviews the clinical and epidemiological aspects of opioid use disorder, as well as the interactions between endogenous and exogenous opioids. Additionally, this chapter discusses current scientific data regarding genetic variations and mechanisms within brain circuitry and the role of endogenous opioids in substance use disorders generally (and opioid use disorder specifically). Future applications of these data to treatment of substance use disorders are also discussed.
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Affiliation(s)
- Lindsay Acree
- Department of Pharmacy Practice, University of Charleston School of Pharmacy, Charleston, WV, USA.
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Cadoni C, De Felice M, Corongiu S, Dessì C, Espa E, Melis M, Fenu S. Role of genetic background in the effects of adolescent nicotine exposure on mesolimbic dopamine transmission. Addict Biol 2020; 25:e12803. [PMID: 31342609 DOI: 10.1111/adb.12803] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 05/15/2019] [Accepted: 05/31/2019] [Indexed: 02/06/2023]
Abstract
Smoking during adolescence may increase the likelihood to develop nicotine dependence and to abuse other drugs such as cocaine. Despite great efforts to understand underlying neurobiological mechanisms of this progression, less attention has been paid to the role of genetic factors. Here, we investigated the influence of both genetic background and age at first nicotine exposure in the long-lasting effects on mesolimbic dopamine transmission including the increased cocaine-rewarding effect. Mid-adolescent and adult rats of inbred strains Lewis (addiction prone) and Fischer 344 (addiction resistant) were administered nicotine (0.4 mg/kg) or vehicle once daily for 5 days. Changes in dopamine transmission were investigated by in vivo microdialysis and electrophysiology after 30 days of withdrawal, whereas changes in cocaine-rewarding effect were assessed via conditioned place preference paradigm. Nicotine pre-exposure differentially changed mesolimbic dopamine transmission depending on strain and age of pre-exposure. A potentiation of dopamine response to nicotine was observed in nucleus accumbens (NAc) core of both strains and age groups, whereas dopamine response in NAc shell was enhanced exclusively in Lewis rats exposed to nicotine during adolescence. A similar response was observed following cocaine challenge at adulthood. Changes in VTA dopamine cell population and activity were observed only in adolescent nicotine-pretreated Lewis rats, which also showed an increased cocaine-rewarding effect at adulthood. These results highlight the influence of genetic background in the long-lasting effects of nicotine exposure and suggest that exposure during adolescence might increase nicotine and cocaine-rewarding properties in genetically vulnerable individuals, thereby facilitating progression toward dependence.
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Affiliation(s)
- Cristina Cadoni
- National Research Council of ItalyInstitute of Neuroscience Cagliari Italy
- Centre of Excellence “Neurobiology of Dependence”University of Cagliari Cagliari Italy
| | - Marta De Felice
- Department of Biomedical Sciences, Division of Neuroscience and Clinical PharmacologyUniversity of Cagliari Cagliari Italy
| | - Silvia Corongiu
- Department of Biomedical Sciences, Neuropsychopharmacology SectionUniversity of Cagliari Cagliari Italy
| | - Christian Dessì
- National Research Council of ItalyInstitute of Neuroscience Cagliari Italy
| | - Elena Espa
- Department of Biomedical Sciences, Neuropsychopharmacology SectionUniversity of Cagliari Cagliari Italy
| | - Miriam Melis
- Department of Biomedical Sciences, Division of Neuroscience and Clinical PharmacologyUniversity of Cagliari Cagliari Italy
| | - Sandro Fenu
- Department of Biomedical Sciences, Neuropsychopharmacology SectionUniversity of Cagliari Cagliari Italy
- Centre of Excellence “Neurobiology of Dependence”University of Cagliari Cagliari Italy
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Pérez-Mañá C, Papaseit E, Fonseca F, Farré A, Torrens M, Farré M. Drug Interactions With New Synthetic Opioids. Front Pharmacol 2018; 9:1145. [PMID: 30364252 PMCID: PMC6193107 DOI: 10.3389/fphar.2018.01145] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 09/21/2018] [Indexed: 12/31/2022] Open
Abstract
Fentanyl, fentanyl analogs, and other new synthetic opioids (NSO) have burst onto the illegal drug market as new psychoactive substances (NPS). They are often sold as heroin to unsuspecting users and produce euphoria through their agonist action on μ- opioid receptors. Their high consumption, often combined with other substances, has led to multiple intoxications during recent years. In some countries, such as the United States, the consumption of opioids, whether for medical or recreational purposes, has become epidemic and is considered a public health problem. Fentanyl analogs are more potent than fentanyl which in turn is 50 times more potent than morphine. Furthermore, some fentanyl analogs have longer duration of action and therefore interactions with other substances and medicines can be more serious. This review is focused on the potentially most frequent interactions of opioid NPS taking into account the drugs present in the reported cases of poly-intoxication, including other illegal drugs of abuse and medication. Substances involved are mainly antidepressants, antihistamines, antipsychotics, benzodiazepines, analgesics, anesthetics, psychostimulants, other opioids, alcohol, and illegal drugs of abuse. The interactions can be produced due to pharmacokinetic and pharmacodynamic mechanisms. Naloxone can be used as an antidote, although required doses might be higher than for traditional opioid intoxications. It is crucial that doctors who habitually prescribe opioids, which are often misused by patients and NPS users, be aware of designer opioids' potentially life-threatening drug-drug interactions in order to prevent new cases of intoxication.
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Affiliation(s)
- Clara Pérez-Mañá
- Clinical Pharmacology Unit, Hospital Universitari Germans Trias i Pujol (HUGTP-IGTP), Badalona, Spain
- Department of Pharmacology, Therapeutics and Toxicology, Autonomous University of Barcelona, Barcelona, Spain
| | - Esther Papaseit
- Clinical Pharmacology Unit, Hospital Universitari Germans Trias i Pujol (HUGTP-IGTP), Badalona, Spain
- Department of Pharmacology, Therapeutics and Toxicology, Autonomous University of Barcelona, Barcelona, Spain
| | - Francina Fonseca
- Drug Addiction Unit, Institute of Neuropsychiatry and Addictions, Hospital del Mar Medical Research Institute, Barcelona, Spain
- Department of Psychiatry and Legal Medicine, Autonomous University of Barcelona, Barcelona, Spain
| | - Adriana Farré
- Drug Addiction Unit, Institute of Neuropsychiatry and Addictions, Hospital del Mar Medical Research Institute, Barcelona, Spain
- Department of Psychiatry and Legal Medicine, Autonomous University of Barcelona, Barcelona, Spain
| | - Marta Torrens
- Drug Addiction Unit, Institute of Neuropsychiatry and Addictions, Hospital del Mar Medical Research Institute, Barcelona, Spain
- Department of Psychiatry and Legal Medicine, Autonomous University of Barcelona, Barcelona, Spain
| | - Magi Farré
- Clinical Pharmacology Unit, Hospital Universitari Germans Trias i Pujol (HUGTP-IGTP), Badalona, Spain
- Department of Pharmacology, Therapeutics and Toxicology, Autonomous University of Barcelona, Barcelona, Spain
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Cargnin S, Viana M, Sances G, Tassorelli C, Terrazzino S. A systematic review and critical appraisal of gene polymorphism association studies in medication-overuse headache. Cephalalgia 2017; 38:1361-1373. [DOI: 10.1177/0333102417728244] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Purpose of review Medication-overuse headache is a secondary chronic headache disorder, evolving from an episodic primary headache type, caused by the frequent and excessive use of headache symptomatic drugs. While gene polymorphisms have been deeply investigated as susceptibility factors for migraine, little attention has been paid to medication-overuse headache genetics. In the present study we conducted a systematic review to identify, appraise and summarize the current findings of gene polymorphism association studies in medication-overuse headache. Methods A comprehensive literature search was conducted on PubMed and Web of Knowledge databases of primary studies that met the diagnostic criteria for medication-overuse headache according to the temporally-relevant Classification of Headache Disorder of the International Headache Society. Results A total of 17 candidate gene association studies focusing on medication-overuse headache were finally included in the qualitative review. Among these, 12 studies investigated the role of common gene polymorphisms as risk factors for medication-overuse headache susceptibility, six studies focused on the relationship with clinical features of medication-overuse headache patients, and four studies evaluated their role as determinants of clinical outcomes in medication-overuse headache patients. Conclusion Results of single studies show a potential role of polymorphic variants of the dopaminergic gene system or of other genes related to drug-dependence pathways as susceptibility factors for disease or as determinants of monthly drug consumption, respectively. In this systematic review, we summarize the findings of gene polymorphism association studies in medication-overuse headache and discuss the methodological issues that need to be addressed in the design of future studies.
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Affiliation(s)
- Sarah Cargnin
- Department of Pharmaceutical Sciences and Interdepartmental Research Center of Pharmacogenetics and Pharmacogenomics (CRIFF), University of Piemonte Orientale “A. Avogadro”, Novara, Italy
| | - Michele Viana
- Headache Science Center, C. Mondino National Neurological Institute, Pavia, Italy
| | - Grazia Sances
- Headache Science Center, C. Mondino National Neurological Institute, Pavia, Italy
| | - Cristina Tassorelli
- Headache Science Center, C. Mondino National Neurological Institute, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Italy
| | - Salvatore Terrazzino
- Department of Pharmaceutical Sciences and Interdepartmental Research Center of Pharmacogenetics and Pharmacogenomics (CRIFF), University of Piemonte Orientale “A. Avogadro”, Novara, Italy
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Woodcock EA, Lundahl LH, Burmeister M, Greenwald MK. Functional mu opioid receptor polymorphism (OPRM1 A(118) G) associated with heroin use outcomes in Caucasian males: A pilot study. Am J Addict 2015; 24:329-35. [PMID: 25911999 DOI: 10.1111/ajad.12187] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Revised: 10/15/2014] [Accepted: 11/16/2014] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND Heroin's analgesic, euphoric and dependence-producing effects are primarily mediated by the mu opioid receptor (MOR). A single gene, OPRM1, encodes the MOR. The functional polymorphism A(118)G, located in exon 1 of the OPRM1 gene, results in anatomically-specific reductions in MOR expression, which may alter an individual's response to heroin. In prior studies 118G (rare allele) carriers demonstrated significantly greater opioid tolerance, overdose vulnerability, and pain sensitivity than 118AA homozygotes. Those findings suggest OPRM1 genotype may impact characteristics of heroin use. METHODS The present pilot study characterized the impact of OPRM1 genotype (rs1799971, 118G allele carriers vs. 118AA homozygotes) on heroin-use phenotypes associated with heroin dependence severity in a sample of male, Caucasian chronic heroin users (n = 86). RESULTS Results indicate that 118G allele carriers reported significantly more heroin use-related consequences and heroin-quit attempts, and were more likely to have sought treatment for their heroin use than 118AA homozygotes. CONCLUSIONS These preliminary findings, consistent with extant data, illustrate a role for OPRM1 allelic variation on heroin use characteristics, and provide support for considering genotype in heroin treatment and relapse prevention.
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Affiliation(s)
- Eric A Woodcock
- Department of Psychiatry and Behavioral Neurosciences, Wayne State University, Detroit, Michigan; Translational Neuroscience Program, Wayne State University, Detroit, Michigan
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Cargnin S, Pautasso C, Viana M, Sances G, Mittino D, Cantello R, Tassorelli C, Nappi G, Terrazzino S. Association ofRAMP1 rs7590387 With the Risk of Migraine Transformation Into Medication Overuse Headache. Headache 2015; 55:658-68. [DOI: 10.1111/head.12559] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/22/2015] [Indexed: 11/26/2022]
Affiliation(s)
- Sarah Cargnin
- Department of Pharmaceutical Sciences; Università del Piemonte Orientale; Novara Italy
| | - Chiara Pautasso
- Department of Pharmaceutical Sciences; Università del Piemonte Orientale; Novara Italy
| | - Michele Viana
- Headache Science Centre; National Neurological Institute C. Mondino; Pavia Italy
| | - Grazia Sances
- Headache Science Centre; National Neurological Institute C. Mondino; Pavia Italy
| | - Daniela Mittino
- Division of Neurology; Maggiore Hospital; Università del Piemonte Orientale; Novara Italy
| | - Roberto Cantello
- Division of Neurology; Maggiore Hospital; Università del Piemonte Orientale; Novara Italy
| | - Cristina Tassorelli
- Headache Science Centre; National Neurological Institute C. Mondino; Pavia Italy
- Department of Brain and Behaviour; University of Pavia; Pavia Italy
| | - Giuseppe Nappi
- Headache Science Centre; National Neurological Institute C. Mondino; Pavia Italy
| | - Salvatore Terrazzino
- Department of Pharmaceutical Sciences; Università del Piemonte Orientale; Novara Italy
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Abstract
Formation of patterns is a common feature in the development of multicellular organism as well as of microbial communities. To investigate the formation of gene expression patterns in colonies, we build a mathematical model of two-dimensional colony growth, where cells carry a coupled positive-and-negative-feedback circuit. We demonstrate that the model can produce sectored, target (concentric), uniform, and scattered expression patterns of regulators, depending on gene expression dynamics and nutrient diffusion. We reconstructed the same regulatory structure in Escherichia coli cells and found gene expression patterns on the surface of colonies similar to the ones produced by the computer simulations. By comparing computer simulations and experimental results, we observed that very simple rules of gene expression can yield a spectrum of well-defined patterns in a growing colony. Our results suggest that variations of the protein content among cells lead to a high level of heterogeneity in colonies. Importance Formation of patterns is a common feature in the development of microbial communities. In this work, we show that a simple genetic circuit composed of a positive-feedback loop and a negative-feedback loop can produce diverse expression patterns in colonies. We obtained similar sets of gene expression patterns in the simulations and in the experiments. Because the combination of positive feedback and negative feedback is common in intracellular molecular networks, our results suggest that the protein content of cells is highly diversified in colonies. Formation of patterns is a common feature in the development of microbial communities. In this work, we show that a simple genetic circuit composed of a positive-feedback loop and a negative-feedback loop can produce diverse expression patterns in colonies. We obtained similar sets of gene expression patterns in the simulations and in the experiments. Because the combination of positive feedback and negative feedback is common in intracellular molecular networks, our results suggest that the protein content of cells is highly diversified in colonies.
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Salamanca Ortiz DN, Vergara Vergara JY, Escobar Córdoba F, Rodríguez Gama Á, Caminos Pinzón JE. Avances genéticos y moleculares en el estudio de trastornos mentales. REVISTA DE LA FACULTAD DE MEDICINA 2014. [DOI: 10.15446/revfacmed.v62n2.45429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Isaza C, Henao J, Velez J, Rodríguez MA, Sierra J, Beltrán L, Sepúlveda A. [Evaluation of the Methadone Maintenance Program of the Risaralda Mental Hospital]. ACTA ACUST UNITED AC 2014; 43:96-105. [PMID: 26574964 DOI: 10.1016/j.rcp.2014.02.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 02/01/2014] [Accepted: 02/04/2014] [Indexed: 11/17/2022]
Abstract
BACKGROUND Psychosocial care and methadone maintenance treatment (MMT) are the preferred strategies for the management of heroin addicts, but the results are still unsatisfactory, justifying the search and intervention of the factors influencing the response to treatment. METHODOLOGY In order to determine the contribution of demographic, clinical and genetic variables on serum concentrations and response to methadone, we investigated patients on MMT, who were receiving methadone in supervised and unchanged doses at least during the previous two weeks. The age, gender, body mass index (BMI), duration of heroin abuse, addiction to other drugs, criminal background, current daily methadone doses, time spent in the TMM, comorbidity and concomitant medication were recorded. Blood samples were taken for the determination of serum levels of racemic methadone and its R and S-enantiomers, and for typing of candidate alleles of POR, CYP2B6, ABCB1, GRIN1, OPRM1, SLC6A3, DßH and ARRB2 genes, all associated with the metabolism, tissue distribution and mechanism of action of methadone. Methadone quantification was by HPLC-DAD, and the detection of genetic markers by Real Time PCR and VNTR methods. RESULTS A total of 80 subject volunteers were enrolled, with a mean age of 23.5 (5) years (86% male), all of them were addicts of multiple drugs, 60% with a criminal background, 5.1 (2.9) years taking heroin, and 5.3 (4) months on MMT, and taking a supervised dose of 41 (12) mg/day methadone. The (R), (S) and (R, S) methadone enantiomer trough plasma levels were, 84 (40), 84 (42), and 168 (77) ng/mL, respectively. All genotypes were in Hardy-Weinberg equilibrium. The two urine tests were negative for heroin in 61.3% (49/80) of the volunteers, the decline in cocaine/crack use was 83%, 30% of marijuana, and other psychoactives (inhalants, benzodiazepines, amphetamines) decreased to zero, while the consumption of snuff remained at 93.5% (75/80). Blood concentrations of racemic methadone and its enantiomers were significantly associated with the dose/day of the medication, but none of the other demographic, clinical or genetic variables impacted on serum levels of methadone. As for the results of the MMT, non-users and occasional users of heroin, as well as those who stopped taking other psychoactive drugs, and the ones who did not, were similar as regards the demographic, genetic and clinical variables. This included the blood metahdone concentrations, except for individuals who did not reduce their consumption of other psychoactives other than heroin, who had significantly (P=.03) higher blood levels of S-methadone, compared with those who did stop taking them. CONCLUSIONS There was a significant reduction in the consumption of heroin and other psychoactives, and social rehabilitation of patients. However, the extensive overlap between effective and ineffective doses of methadone suggests the presence of personal and social variables that transcend the simple pharmacological management. These probably need to be addressed more successfully from the psychosocial features, particularly as regards to identifying and overcoming relapse-trigger experiences, as well as certain features of the patient, such as their psychological distress level or their psychiatric disorders.
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Affiliation(s)
- Carlos Isaza
- Farmacología, Facultad de Ciencias de la Salud, Universidad Tecnológica de Pereira, Pereira, Colombia.
| | - Julieta Henao
- Genética, Facultad de Ciencias de la Salud, Laboratorio de Genética Médica, Universidad Tecnológica de Pereira, Pereira, Colombia
| | - Juan Velez
- Epidemiología, Dirección Científica, ESE Hospital Mental de Risaralda, Pereira, Colombia
| | | | - Juan Sierra
- Farmacodependencia, ESE Hospital Mental de Risaralda, Pereira, Colombia
| | - Leonardo Beltrán
- Laboratorio de Genética Médica, Universidad Tecnológica de Pereira, Pereira, Colombia
| | - Ana Sepúlveda
- Laboratorio de Genética Médica, Universidad Tecnológica de Pereira, Pereira, Colombia
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Fonseca F, Gratacòs M, Escaramís G, De Cid R, Martín-Santos R, Farré M, Estivill X, Torrens M. ALDH5A1 variability in opioid dependent patients could influence response to methadone treatment. Eur Neuropsychopharmacol 2014; 24:420-4. [PMID: 24230997 DOI: 10.1016/j.euroneuro.2013.10.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Revised: 09/04/2013] [Accepted: 10/09/2013] [Indexed: 11/17/2022]
Abstract
Methadone maintenance treatment is the most widely-used therapy in opioid dependence, but some patients relapse or drop out from treatment. We genotyped a genetic variant in the succinic semialdehyde dehydrogenase enzyme gene, ALDH5A1, and found that subjects carrying the T variant allele have a higher risk to be nonresponders to methadone treatment (OR=3.16; 95% CI [1.48-6.73], P=0.0024). This could be due to a reduction in the ALDH5A1 enzyme activity, that would increase endogenous gamma-hydroxbutyric acid (GHB) and gamma-aminobutyric acid (GABA) levels and therefore, inducing symptoms such as sedation and impaired pschomotor performance. These neuropsychological effects related with the reduction in enzyme activity could be responsible for a higher propensity to relapse in these genetically predisposed patients.
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Affiliation(s)
- Francina Fonseca
- Institut de Neuropsiquiatria i Addicions, Hospital del Mar, Barcelona, Spain; Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Barcelona, Spain
| | - Mònica Gratacòs
- CIBER Epidemiología y Salud Pública (CIBERESP) and Genes and Disease Program, Barcelona, Spain
| | - Geòrgia Escaramís
- CIBER Epidemiología y Salud Pública (CIBERESP) and Genes and Disease Program, Barcelona, Spain
| | - Rafael De Cid
- CIBER Epidemiología y Salud Pública (CIBERESP) and Genes and Disease Program, Barcelona, Spain; Center for Genomic Regulation (CRG-UPF), Parc de Recerca Biomèdica (PRBB), Barcelona, Spain
| | - Rocío Martín-Santos
- Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Barcelona, Spain; Service of Psychiatry and Psychology, Neuroscience Institute, Hospital Clinic, Institut d'Investigació Biomèdiques August Pi i Sunyer (IDIBAPS), Centro de Investigación Biomédica en Red en Salud Mental (CIBERSAM), Barcelona, Spain; Department of Psychiatry and Clinical Psychobiology, University of Barcelona, Barcelona, Spain
| | - Magi Farré
- Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Barcelona, Spain; Psychiatry and Pharmacology Departments, Autonomous University of Barcelona, Barcelona, Spain
| | - Xavier Estivill
- CIBER Epidemiología y Salud Pública (CIBERESP) and Genes and Disease Program, Barcelona, Spain; Center for Genomic Regulation (CRG-UPF), Parc de Recerca Biomèdica (PRBB), Barcelona, Spain; Experimental and Health Sciences Department, Pompeu Fabra University, Barcelona, Spain
| | - Marta Torrens
- Institut de Neuropsiquiatria i Addicions, Hospital del Mar, Barcelona, Spain; Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Barcelona, Spain; Psychiatry and Pharmacology Departments, Autonomous University of Barcelona, Barcelona, Spain.
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Petäjä-Repo UE, Lackman JJ. Targeting opioid receptors with pharmacological chaperones. Pharmacol Res 2013; 83:52-62. [PMID: 24355364 DOI: 10.1016/j.phrs.2013.12.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 12/05/2013] [Accepted: 12/05/2013] [Indexed: 11/29/2022]
Abstract
G protein-coupled receptors (GPCRs) are polytopic membrane proteins that have a pivotal role in cellular signaling. Like other membrane proteins, they fold in the endoplasmic reticulum (ER) before they are transported to the plasma membrane. The ER quality control monitors the folding process and misfolded proteins and slowly folding intermediates are targeted to degradation in the cytosol via the ubiquitin-proteasome pathway. The high efficiency of the quality control machinery may lead to the disposal of potentially functional receptors. This is the major underlying course for loss-of-function conformational diseases, such as retinitis pigmentosa, nephrogenic diabetes insipidus and early onset obesity, which involve mutant GPCRs. During the past decade, it has become increasingly evident that small-molecular lipophilic and pharmacologically selective receptor ligands, called pharmacological chaperones (PCs), can rescue these mutant receptors from degradation by stabilizing newly synthesized receptors in the ER and enhancing their transport to the cell surface. This has raised the interesting prospect that PCs might have therapeutic value for the treatment of conformational diseases. At the same time, accumulating evidence has indicated that wild-type receptors might also be targeted by PCs, widening their therapeutic potential. This review focuses on one GPCR subfamily, opioid receptors that have been useful models to unravel the mechanism of action of PCs. In contrast to most other GPCRs, compounds that act as PCs for opioid receptors, including widely used opioid drugs, target wild-type receptors and their common natural variants.
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Affiliation(s)
- Ulla E Petäjä-Repo
- Department of Anatomy and Cell Biology and Medical Research Center Oulu, Institute of Biomedicine, University of Oulu, FI-90014 Oulu, Finland.
| | - Jarkko J Lackman
- Department of Anatomy and Cell Biology and Medical Research Center Oulu, Institute of Biomedicine, University of Oulu, FI-90014 Oulu, Finland
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Greenwald MK, Steinmiller CL, Sliwerska E, Lundahl L, Burmeister M. BDNF Val(66)Met genotype is associated with drug-seeking phenotypes in heroin-dependent individuals: a pilot study. Addict Biol 2013; 18:836-45. [PMID: 22339949 DOI: 10.1111/j.1369-1600.2011.00431.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Brain-derived neurotrophic factor (BDNF) Val(66)Met genotype has been associated with neurobehavioral deficits. To examine its relevance for addiction, we examined BDNF genotype differences in drug-seeking behavior. Heroin-dependent volunteers (n = 128) completed an interview that assessed past-month naturalistic drug-seeking/use behaviors. In African Americans (n = 74), the Met allele was uncommon (carrier frequency 6.8%); thus, analyses focused on European Americans (n = 54), in whom the Met allele was common (carrier frequency 37.0%). In their natural setting, Met carriers (n = 20) reported more time- and cost-intensive heroin-seeking and more cigarette use than Val homozygotes (n = 34). BDNF Val(66)Met genotype predicted 18.4% of variance in 'weekly heroin investment' (purchasing time × amount × frequency). These data suggest that the BDNF Met allele may confer a 'preferred drug-invested' phenotype, resistant to moderating effects of higher drug prices and non-drug reinforcement. These preliminary hypothesis-generating findings require replication, but are consistent with pre-clinical data that demonstrate neurotrophic influence in drug reinforcement. Whether this genotype is relevant to other abused substances besides opioids or nicotine, or treatment response, remains to be determined.
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Affiliation(s)
- Mark K Greenwald
- Substance Abuse Research Division, Department of Psychiatry and Behavioral Neurosciences, Wayne State University School of Medicine, Detroit, MI, USA.
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Abstract
Cytochrome P450 enzymes (CYPs) metabolize many drugs that act on the central nervous system (CNS), such as antidepressants and antipsychotics; drugs of abuse; endogenous neurochemicals, such as serotonin and dopamine; neurotoxins; and carcinogens. This takes place primarily in the liver, but metabolism can also occur in extrahepatic organs, including the brain. This is important for CNS-acting drugs, as variation in brain CYP-mediated metabolism may be a contributing factor when plasma levels do not predict drug response. This review summarizes the characterization of CYPs in the brain, using examples from the CYP2 subfamily, and discusses sources of variation in brain CYP levels and metabolism. Some recent experiments are described that demonstrate how changes in brain CYP metabolism can influence drug response, toxicity and drug-induced behaviours. Advancing knowledge of brain CYP-mediated metabolism may help us understand why patients respond differently to drugs used in psychiatry and predict risk for psychiatric disorders, including neurodegenerative diseases and substance abuse.
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Affiliation(s)
| | - Rachel F. Tyndale
- Correspondence to: R.F. Tyndale, Department of Pharmacology and Toxicology, 1 King’s College Circle, Toronto ON M5S 1A8;
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Wilhelm CJ, Mitchell SH. Acute ethanol does not always affect delay discounting in rats selected to prefer or avoid ethanol. Alcohol Alcohol 2012; 47:518-24. [PMID: 22645038 DOI: 10.1093/alcalc/ags059] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
AIMS The purpose of this study was to determine whether animals predisposed to prefer alcohol possess an altered acute response to alcohol on a delay discounting task relative to animals predisposed to avoid alcohol. METHODS We used rats selected to prefer or avoid alcohol to assess whether genotype moderates changes in delay discounting induced by acute ethanol exposure. Selectively bred rat lines of Sardinian alcohol-preferring (sP; n = 8) and non-preferring (sNP; n = 8) rats, and alko alcohol (AA, n = 8) and alko non-alcohol (ANA, n = 8) rats were trained in an adjusting amount task to assess delay discounting. RESULTS There were no significant effects of line on baseline discounting; however, both lines of alcohol-preferring rats exhibit slowed reaction times. Acute ethanol (0, 0.25, 0.5 g/kg) treatment also had no effect on delay discounting in any of the selectively bred rat lines. CONCLUSION Our data indicate that in these lines of animals, alcohol preference or avoidance has no impact on delay discounting following acute ethanol exposure. It is possible that other genetic models or lines may be differentially affected by alcohol and exhibit qualitatively and quantitatively different responses in delay discounting tasks.
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Affiliation(s)
- Clare J Wilhelm
- Department of Psychiatry, Oregon Health and Science University, Portland, OR 97239, USA.
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15
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Alberg AJ, Carpenter MJ. Enhancing the effectiveness of smoking cessation interventions: a cancer prevention imperative. J Natl Cancer Inst 2012; 104:260-2. [PMID: 22282541 DOI: 10.1093/jnci/djr558] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Delis F, Benveniste H, Xenos M, Grandy D, Wang GJ, Volkow ND, Thanos PK. Loss of dopamine D2 receptors induces atrophy in the temporal and parietal cortices and the caudal thalamus of ethanol-consuming mice. Alcohol Clin Exp Res 2011; 36:815-25. [PMID: 22017419 DOI: 10.1111/j.1530-0277.2011.01667.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND The need of an animal model of alcoholism becomes apparent when we consider the genetic diversity of the human populations, an example being dopamine D2 receptor (DRD2) expression levels. Research suggests that low DRD2 availability is associated with alcohol abuse, while higher DRD2 levels may be protective against alcoholism. This study aims to establish whether (i) the ethanol-consuming mouse is a suitable model of alcohol-induced brain atrophy and (ii) DRD2 protect the brain against alcohol toxicity. METHODS Adult Drd2+/+ and Drd2-/- mice drank either water or 20% ethanol solution for 6 months. At the end of the treatment period, the mice underwent magnetic resonance (MR) imaging under anesthesia. MR images were registered to a common space, and regions of interest were manually segmented. RESULTS We found that chronic ethanol intake induced a decrease in the volume of the temporal and parietal cortices as well as the caudal thalamus in Drd2-/- mice. CONCLUSIONS The result suggests that (i) normal DRD2 expression has a protective role against alcohol-induced brain atrophy and (ii) in the absence of Drd2 expression, prolonged ethanol intake reproduces a distinct feature of human brain pathology in alcoholism, the atrophy of the temporal and parietal cortices.
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Affiliation(s)
- Foteini Delis
- Laboratory of Neuroimaging, National Institute on Alcohol Abuse and Alcoholism, NIH, Bethesda, Maryland, USA
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17
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Mitchell SH. The genetic basis of delay discounting and its genetic relationship to alcohol dependence. Behav Processes 2011; 87:10-7. [PMID: 21354276 DOI: 10.1016/j.beproc.2011.02.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Revised: 02/17/2011] [Accepted: 02/17/2011] [Indexed: 12/20/2022]
Abstract
Delay discounting is steeper for individuals who drink heavily or are alcohol dependent, but the reasons for this are unclear. Given the substantial genetic component for alcohol dependence it is not unreasonable to ask whether discounting and alcohol dependence have a genetic relationship. For there to be a genetic relationship, delay discounting must have a genetic component (heritability). A review of the human and animal literature suggests that this is the case. Other literature examining whether discounting is a correlated phenotype in individuals who are genetically predisposed to drink (family history positive individuals and selected lines of rats and mice) is mixed, suggesting that networks of genes are critical for the relationship to be seen. The identities of the genes in this network are not yet known, but research examining polymorphisms associated with differences in discounting is beginning to address this issue.
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Affiliation(s)
- Suzanne H Mitchell
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR 97239, United States.
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18
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Ho MK, Goldman D, Heinz A, Kaprio J, Kreek MJ, Li MD, Munafò MR, Tyndale RF. Breaking barriers in the genomics and pharmacogenetics of drug addiction. Clin Pharmacol Ther 2010; 88:779-91. [PMID: 20981002 PMCID: PMC3738009 DOI: 10.1038/clpt.2010.175] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Drug addiction remains a substantial health issue with limited treatment options currently available. Despite considerable advances in the understanding of human genetic architecture, the genetic underpinning of complex disorders remains elusive. On the basis of our current understanding of neurobiology, numerous candidate genes have been implicated in the etiology and response to treatment for different addictions. Genome-wide association (GWA) studies have also identified novel targets. However, replication of these studies is often lacking, and this complicates interpretation. The situation is expected to improve as issues such as phenotypic characterization, the apparent "missing heritability," the identification of functional variants, and possible gene-environment (G × E) interactions are addressed. In addition, there is growing evidence that genetic information can be useful in refining the choice of addiction treatment. As genetic testing becomes more common in the practice of medicine, a variety of ethical and practical challenges, some of which are unique to drug addiction, will also need to be considered.
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Affiliation(s)
- M K Ho
- Centre for Addiction & Mental Health, Department of Psychiatry, Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada
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Chiba J, Akaishi A, Ikeda R, Inouye M. Electrochemical detection of insertion/deletion mutations based on enhanced flexibility of bulge-containing duplexes on electrodes. Chem Commun (Camb) 2010; 46:7563-5. [PMID: 20852766 DOI: 10.1039/c0cc02371j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ferrocene-modified DNA probes formed fully matched duplexes and bulge-containing ones with wild-type and insertion/deletion-type complements of clinical importance, respectively. Cyclic voltammetry measurements revealed that the bulge-containing duplexes showed an increased flexibility compared to the fully matched duplexes. The difference in the bending elasticity could be read out electrochemically by square wave voltammetry.
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Affiliation(s)
- Junya Chiba
- Graduate School of Pharmaceutical Sciences, University of Toyama, Sugitani 2630, Toyama 930-0194, Japan.
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20
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Abstract
Neurobiologische Modelle der Substanzabhängigkeit postulieren, dass Abhängigkeit aus einem Zusammenspiel zwischen positiver und negativer Verstärkung entsteht. Die positive Verstärkung wird über die dopaminerge Transmission im Striatum vermittelt, während die negative Verstärkung die neurobiologischen Stresssysteme involviert. Abhängigkeit geht mit lang anhaltenden Änderungen der zerebralen Motivationssysteme einher. Neuropsychologische Forschungsarbeiten weisen auf ein beeinträchtigtes Entscheidungsverhalten hin, welches mit einer Dysfunktion im ventromedialen präfrontalen Kortex zusammenhängen könnte. Sie betonen die Rolle der Insula, welche die neuronale Grundlage für die fehlende Einsicht ins problematische Suchtverhalten als auch für die Vermittlung des bewussten Drangs, die Substanz zu konsumieren, sein könnte. Neurobiologische und neuropsychologische Sichtweisen werden in einem Modell integriert, das impulsive subkortikale und dopamin-bezogene Prozesse mit einer Beeinträchtigung der kortikalen Hemmung und kognitiven Defiziten verbindet.
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Affiliation(s)
- C. Martin-Soelch
- Klinik für Psychiatrie und Psychotherapie, Universitätsspital Zürich
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