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Pereira LF, Muniz FWMG, de Lima MDDM, Rösing CK, de Deus Moura LDFA, de Moura MS, Lima CCB. Genetics and sleep bruxism: a systematic review and meta-analysis of studies with twins. Sleep Breath 2024:10.1007/s11325-024-03090-5. [PMID: 38958854 DOI: 10.1007/s11325-024-03090-5] [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: 05/24/2023] [Revised: 06/14/2024] [Accepted: 06/17/2024] [Indexed: 07/04/2024]
Abstract
OBJECTIVE To systematically review the literature regarding the concordance of sleep bruxism (SB) between monozygotic (MZ) and dizygotic (DZ) twins. METHODS The registration for this systematic review was accomplished in the International Prospective Register of Systematic Reviews (PROSPERO, No. CRD42021251751). As of July 2022, four databases were searched, including PubMed, Scopus, Embase, and Web of Science, as well as the grey literature in Google Scholar and OpenGrey. Observational studies evaluating SB in MZ and DZ twins of any age and sex were included. For the evaluation of the risk of bias, the Joanna Briggs checklist was utilized. The certainty of evidence was assessed via the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) system. Pooled and subgroup meta-analyses were performed to estimate concordance of SB between twins (p < 0.05). RESULTS In total, 3,155 records were identified. In the qualitative analysis, eleven studies were included; of these, seven were included in the meta-analysis. The majority of the articles exhibited a low risk of bias (63.6%). Greater SB concordance was observed between MZ twins than between DZ twins in the analysis of general concordance (OR = 1.47; 95% CI = 1.07-2.02) and also positive concordance (OR = 1.53; 95% CI = 1.29-1.81). Within the subgroup analyses, the significance of the findings remained only for the reported/self-reported SB regarding general concordance (OR = 1.44; 95% CI = 1.07-1.95) and positive concordance (OR = 1.55; 95% CI = 1.28-1.88). Low certainty of the evidence was observed for the general concordance analysis, while moderate certainty was observed for the positive concordance. CONCLUSION There was a higher concordance of SB in MZ twins compared to DZ twins, indicating a possible genetic influence on the condition's occurrence.
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Affiliation(s)
| | | | - Marina de Deus Moura de Lima
- Department of Pathology and Dental Clinic, Federal University of Piaui, Campus Universitário Ministro Petrônio Portella, Bloco 5 - Postgraduate Program in Dentistry, Teresina, Piaui, 64049-550, Brazil
| | | | - Lúcia de Fátima Almeida de Deus Moura
- Department of Pathology and Dental Clinic, Federal University of Piaui, Campus Universitário Ministro Petrônio Portella, Bloco 5 - Postgraduate Program in Dentistry, Teresina, Piaui, 64049-550, Brazil
| | - Marcoeli Silva de Moura
- Department of Pathology and Dental Clinic, Federal University of Piaui, Campus Universitário Ministro Petrônio Portella, Bloco 5 - Postgraduate Program in Dentistry, Teresina, Piaui, 64049-550, Brazil
| | - Cacilda Castelo Branco Lima
- Department of Pathology and Dental Clinic, Federal University of Piaui, Campus Universitário Ministro Petrônio Portella, Bloco 5 - Postgraduate Program in Dentistry, Teresina, Piaui, 64049-550, Brazil.
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Desai D, Patel J, Saiyed F, Upadhyay H, Kariya P, Patel J. A Literature Review on Holistic Well-Being and Dopamine Fasting: An Integrated Approach. Cureus 2024; 16:e61643. [PMID: 38966464 PMCID: PMC11223451 DOI: 10.7759/cureus.61643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2024] [Accepted: 06/04/2024] [Indexed: 07/06/2024] Open
Abstract
Popularly known as dopaminergic detox or dopamine fasting, it is a concept that aims at reducing dependence on instant satisfaction gratification and overstimulation to attain mental clarity, lessen anxiety, and be able to enjoy everyday events again. Digital detox has been a part of the dopamine fasting concept for several years now. However, some critics argue that this notion has no scientific proof behind it and may fail to deal with the problem of dopamine dysregulation. Some intense types of dopamine fasting which include extreme isolation or strict dieting can result in damage to mental health as well as physical fitness. The objective of the article is to understand what dopamine fasting means and see the literature and evidence available on the topic. Indexes like PubMed, Scopus, OVID, Embase, and Google Scholar were searched using the keywords to understand the existing knowledge about dopamine fasting. The literature review was then written to incorporate the understanding in a way that can be implemented practically. Recent studies have shown that individuals who engage in dopamine-fasting-like ideologies may experience reduced impulsive behaviors, increased focus on tasks, and reduced overwhelm. However, extreme forms of dopamine fasting can lead to feelings of loneliness, anxiety, and malnutrition, which can have detrimental effects on mental and physical health. Hence, the effects of dopamine fasting can vary greatly among individuals, and there is no one-size-fits-all approach. It is essential to consider individual needs and preferences when incorporating dopamine fasting into one's lifestyle and explore alternative practices that align with the principles of dopamine fasting. Understanding and respecting these differences is crucial in determining the most suitable strategies for maintaining a balanced dopamine response and overall psychological health. The benefits of dopamine fasting can be tremendous if done correctly but it depends on every individual to find the correct way and in the modern day, the practices can become tough to implement.
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Affiliation(s)
- Dev Desai
- Internal Medicine, Smt. Nathiba Hargovandas Lakhmichand Municipal Medical College, Ahmedabad, IND
| | - Jekee Patel
- Surgery, Gujarat Medical Education and Research Society Medical College, Vadnagar, IND
| | - Falak Saiyed
- Internal Medicine, Smt. Nathiba Hargovandas Lakhmichand Municipal Medical College, Ahmedabad, IND
| | - Himarshi Upadhyay
- Medicine, Gujarat Medical Education and Research Society Medical College, Vadnagar, IND
| | | | - Jitendra Patel
- Physiology, Gujarat Medical Education and Research Society Medical College, Vadnagar, IND
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3
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Shen S, Liu H. Is Sex Good for Your Brain? A National Longitudinal Study on Sexuality and Cognitive Function among Older Adults in the United States. JOURNAL OF SEX RESEARCH 2023; 60:1345-1355. [PMID: 37506374 PMCID: PMC10615694 DOI: 10.1080/00224499.2023.2238257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
Abstract
Using a life course approach, we examined how sexuality is related to cognitive function for partnered older adults. We utilized longitudinal data from two rounds of the National Social Life, Health, and Aging Project (NSHAP) to analyze 1,683 respondents. Cognitive function was measured using a continuous Montreal Cognitive Assessment (MoCA) score. We considered both sexual frequency and sexual quality (i.e., physical pleasure, emotional satisfaction). We estimated cross-lagged models to consider the potential reciprocal relationship between sexuality and cognitive function. Results indicated that sexuality was not related to later cognitive function in the total sample, but the pattern varied by age and gender. For adults aged 62-74, better sexual quality (i.e., feelings of physical pleasure and emotional satisfaction) was related to better cognitive functioning, while for those aged 75-90, more frequent sex was related to better cognitive functioning. Feelings of physical pleasure were related to better cognitive functioning for men but not women. There was no evidence of cognitive functioning being related to later sexuality. The findings highlight the importance of age and gender in modifying the link between sexuality and cognition in later life.
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Affiliation(s)
- Shannon Shen
- Department of Sociology and Social Work, Hope College, Holland, Michigan, United States
| | - Hui Liu
- Center on Aging and the Life Course and Department of Sociology, Purdue University, West Lafayette, Indiana, United States
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4
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Kostopoulou E. Impact of COVID-19 on adolescent sexual life and attitudes: have we considered all the possible secondary effects of the pandemic? Eur J Pediatr 2023:10.1007/s00431-023-04878-5. [PMID: 36939878 PMCID: PMC10026209 DOI: 10.1007/s00431-023-04878-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 02/06/2023] [Accepted: 02/14/2023] [Indexed: 03/21/2023]
Abstract
A significant increase in pornography use has been reported in the adolescent population worldwide over the past few years, with intensification of the phenomenon during the COVID-19 pandemic. The aim of the present review is to provide data on the frequency of pornography consumption among adolescents during the pandemic and raise awareness about its potential impact on personal beliefs and sexual attitudes in the long term. A comprehensive literature review was performed in two scientific databases using the crossmatch of the terms "pornography", "adolescents" and "COVID-19". A significant increase in pornography consumption in adolescents was documented during the COVID-19 pandemic as a result of social detachment. Fulfilment of sexual desires in the context of social distancing, alleviation of COVID-19-related boredom and psychological strain, and coping with negative emotions are some of the reported reasons for increased pornography use during the pandemic. However, concerns have been raised in the literature regarding potentially negative effects of excessive pornography use from an early age, including the development of pornography addiction, sexual dissatisfaction and aggressive sexual attitudes reinforced by gender preoccupations and sexual inequality beliefs. CONCLUSION The extent to which increased pornography consumption from an early age during the COVID-19 pandemic may have affected adolescents' mental well-being, personality construction and sexual behaviour is yet to be seen. Vigilance from the society as a whole is required so that potential negative adverse effects of adolescent pornography use and potential social implications are recognized early and managed. Further research is needed so that the full impact of the COVID-19-related pornography use in the adolescent population is revealed. WHAT IS KNOWN •A significant increase in pornography consumption has been documented in the adolescent population worldwide over the past decades due to its quick, affordable and easy access from electronic devices and the possibility of anonymous and private participation. •During the COVID-19 pandemic, this phenomenon was intensified as a coping mechanism to social isolation and increased psychosocial strain. WHAT IS NEW •Concerns have been raised regarding the risk of pornography addiction in adolescents during the COVID-19 pandemic, making the post-pandemic adaptation challenging. •Awareness is raised in parents, health care providers and policy makers about the potential negative impacts of pornography consumption from an early, vulnerable age, such as sexual dissatisfaction and development of aggressive sexual attitudes and sex inequality beliefs.
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Affiliation(s)
- Eirini Kostopoulou
- Department of Paediatrics, University General Hospital of Patras, University of Patras, Patras, 26504, Greece.
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5
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Theorizing the Role of Dopaminergic Polymorphic Risk Alleles with Intermittent Explosive Disorder (IED), Violent/Aggressive Behavior and Addiction: Justification of Genetic Addiction Risk Severity (GARS) Testing. J Pers Med 2022; 12:jpm12121946. [PMID: 36556167 PMCID: PMC9784939 DOI: 10.3390/jpm12121946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/09/2022] [Accepted: 11/17/2022] [Indexed: 11/25/2022] Open
Abstract
Scientific studies have provided evidence that there is a relationship between violent and aggressive behaviors and addictions. Genes involved with the reward system, specifically the brain reward cascade (BRC), appear to be associated with various addictions and impulsive, aggressive, and violent behaviors. In our previous research, we examined the Taq A1 allele (variant D2 dopamine receptor gene) and the DAT-40 base repeat (a variant of the dopamine transporter gene) in 11 Caucasian boys at the Brown School in San Marcus, Texas, diagnosed with intermittent explosive disorder. Thirty supernormal controls were screened to exclude several reward-deficit behaviors, including pathological violence, and genotyped for the DRD2 gene. Additionally, 91 controls were screened to exclude ADHD, pathological violence, alcoholism, drug dependence, and tobacco abuse, and their results were compared with DAT1 genotype results. In the schoolboys vs. supercontrols, there was a significant association with the D2 variant and a trend with the dopamine transporter variant. Results support our hypothesis and the involvement of at least two gene risk alleles with adolescent violent/aggressive behaviors. This study and the research presented in this paper suggest that violent/aggressive behaviors are associated with a greater risk of addiction, mediated via various genes linked to the BRC. This review provides a contributory analysis of how gene polymorphisms, especially those related to the brain reward circuitry, are associated with violent behaviors.
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Snaychuk LA, Ferrão YA, Fontenelle LF, Miguel EC, de Mathis MA, Scanavino MDT, Kim HS. Co-Occurring Obsessive-Compulsive Disorder and Compulsive Sexual Behavior: Clinical Features and Psychiatric Comorbidities. ARCHIVES OF SEXUAL BEHAVIOR 2022; 51:4111-4123. [PMID: 36066680 DOI: 10.1007/s10508-022-02412-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 08/18/2022] [Accepted: 08/20/2022] [Indexed: 06/15/2023]
Abstract
Obsessive-compulsive disorder (OCD) commonly co-occurs with other psychiatric conditions. Though research is limited, there is preliminary evidence that OCD also co-occurs with compulsive sexual behavior (CSB). Yet, few studies have investigated the demographic, clinical, and psychiatric comorbidities associated with co-occurring OCD and CSB. To address this gap, the current study aimed to evaluate rates of co-occurring OCD and CSB, identify demographic and clinical factors associated with comorbid OCD and CSB, and assess associated psychiatric comorbidity. Participants (N = 950) were patients of a large multisite treatment for OCD. Standardized self-report measures were used to assess demographic and clinical characteristics such as anxiety, depression, and severity and dimensions of OCD. Semi-structured interviews including the SCID were used to assess psychiatric comorbidities. A total of 36 (3.8%) of participants met the criteria for CSB. Binary logistic regression analysis revealed that males were significantly more likely to present with CSB than females and CSB was associated with greater psychiatric comorbidity, particularly impulse control disorders. These findings suggest that individuals with co-occurring OCD and CSB may have more complex treatment needs, and more tailored interventions may be necessary.
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Affiliation(s)
- Lindsey A Snaychuk
- Department of Psychology, Toronto Metropolitan University, 350 Victoria St., Toronto, ON, M5B 2K3, Canada
| | - Ygor A Ferrão
- Clinical Neurosciences Department, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, Brazil
| | - Leonardo F Fontenelle
- Departamento de Psiquiatria e Medicina Legal, Instituto de Psiquiatria da Universidade Federal do Rio de Janeiro (IPUB/UFRJ) e Instituto D'Or de Pesquisa e Ensino (IDOR), Rio de Janeiro, Brazil
- Department of Psychiatry, School of Clinical Sciences, Monash University, Clayton, VIC, Australia
| | | | - Maria A de Mathis
- Institute of Psychiatry, Universidade de São Paulo, São Paulo, Brazil
| | | | - Hyoun S Kim
- Department of Psychology, Toronto Metropolitan University, 350 Victoria St., Toronto, ON, M5B 2K3, Canada.
- University of Ottawa Institute of Mental Health Research at The Royal, Ottawa, ON, Canada.
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Madigan MA, Gupta A, Bowirrat A, Baron D, Badgaiyan RD, Elman I, Dennen CA, Braverman ER, Gold MS, Blum K. Precision Behavioral Management (PBM) and Cognitive Control as a Potential Therapeutic and Prophylactic Modality for Reward Deficiency Syndrome (RDS): Is There Enough Evidence? INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19116395. [PMID: 35681980 PMCID: PMC9180535 DOI: 10.3390/ijerph19116395] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 05/19/2022] [Accepted: 05/20/2022] [Indexed: 12/20/2022]
Abstract
This brief commentary aims to provide an overview of the available and relatively new precision management of reward deficiencies manifested as substance and behavioral disorders. Current and future advances, concepts, and the substantial evidential basis of this potential therapeutic and prophylactic treatment modality are presented. Precision Behavioral Management (PBM), conceptualized initially as Precision Addiction Management (PAM), certainly deserves consideration as an important modality for the treatment of impaired cognitive control in reward processing as manifested in people with neurobiologically expressed Reward Deficiency Syndrome (RDS).
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Affiliation(s)
- Margaret A. Madigan
- The Kenneth Blum Behavioral & Neurogenetic Institute, LLC., Austin, TX 78701, USA; (M.A.M.); (C.A.D.); (E.R.B.)
| | - Ashim Gupta
- Future Biologics, Lawrenceville, GA 30043, USA;
| | - Abdalla Bowirrat
- Department of Molecular Biology, Adelson School of Medicine, Ariel University, Ariel 40700, Israel;
| | - David Baron
- Center for Psychiatry, Medicine, & Primary Care (Office of Provost), Division of Addiction Research & Education, Western University Health Sciences, Pomona, CA 91766, USA;
| | - Rajendra D. Badgaiyan
- Department of Psychiatry, South Texas Veteran Health Care System, Audie L. Murphy Memorial VA Hospital, Long School of Medicine, University of Texas Medical Center, San Antonio, TX 78229, USA;
| | - Igor Elman
- Center for Pain and the Brain (P.A.I.N Group), Department of Anesthesiology, Critical Care & Pain Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, MA 02115, USA;
| | - Catherine A. Dennen
- The Kenneth Blum Behavioral & Neurogenetic Institute, LLC., Austin, TX 78701, USA; (M.A.M.); (C.A.D.); (E.R.B.)
| | - Eric R. Braverman
- The Kenneth Blum Behavioral & Neurogenetic Institute, LLC., Austin, TX 78701, USA; (M.A.M.); (C.A.D.); (E.R.B.)
| | - Mark S. Gold
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA;
| | - Kenneth Blum
- The Kenneth Blum Behavioral & Neurogenetic Institute, LLC., Austin, TX 78701, USA; (M.A.M.); (C.A.D.); (E.R.B.)
- Center for Psychiatry, Medicine, & Primary Care (Office of Provost), Division of Addiction Research & Education, Western University Health Sciences, Pomona, CA 91766, USA;
- Institute of Psychology, ELTE Eötvös Loránd University, Egyetem tér 1-3, 1053 Budapest, Hungary
- Department of Psychiatry, School of Medicine, University of Vermont, Burlington, VT 05405, USA
- Department of Psychiatry, Wright State University Boonshoft School of Medicine, Dayton VA Medical Centre, Dayton, OH 45324, USA
- Correspondence:
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Neppala GK, Terkuhle I, Wagner A, Lepow L, Shaik RB, Freed R, Kimhy D, Pietrzak RH, Velthorst E, Feder A, Ivanov I, Parvaz MA. Social Isolation-Mediated Exacerbation of Negative Affect in Young Drinkers during the COVID-19 Pandemic. Brain Sci 2022; 12:brainsci12020214. [PMID: 35203977 PMCID: PMC8870361 DOI: 10.3390/brainsci12020214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/26/2022] [Accepted: 02/02/2022] [Indexed: 02/04/2023] Open
Abstract
Emerging research on psychological adjustment during the COVID-19 outbreak has suggested that young people may be particularly vulnerable to increases in negative affect during the pandemic. However, the association between alcohol use in youth and change in negative affect during this unprecedented time is not clear. Using an online survey, this study obtained scores on negative affect (before and during the COVID-19 pandemic), pandemic-related stress, change in drinking frequency, and traits including resilience, impulsivity and anhedonia, from a sample of drinkers and non-drinkers, up to the age of 21. Young drinkers experienced a greater increase in negative affect during the pandemic compared to non-drinkers, and this differential rise in negative affect was mediated by the pandemic-related stress of social isolation. Young drinkers also experienced a decrease in alcohol use during the pandemic, but this was not associated with a change in negative affect. Interestingly, young drinkers with greater resilience and lower anhedonia reported less increase in negative affect during the COVID-19 pandemic. Taken together, these results show that the greater increase in negative affect that young drinkers experienced during the COVID-19 pandemic, compared to their non-drinking counterparts, was mediated by pandemic-related social isolation. Moreover, greater resilience and lower anhedonia may have served as protective factors for mitigating the social isolation-induced worsening of negative affect in young drinkers during the pandemic. These findings may inform future studies investigating potential indicators of maladaptive affective responses to public health crises in vulnerable adolescent populations.
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Affiliation(s)
- Gopi K. Neppala
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (G.K.N.); (I.T.); (A.W.); (L.L.); (R.B.S.); (R.F.); (D.K.); (E.V.); (A.F.); (I.I.)
| | - Isabel Terkuhle
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (G.K.N.); (I.T.); (A.W.); (L.L.); (R.B.S.); (R.F.); (D.K.); (E.V.); (A.F.); (I.I.)
| | - Ariella Wagner
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (G.K.N.); (I.T.); (A.W.); (L.L.); (R.B.S.); (R.F.); (D.K.); (E.V.); (A.F.); (I.I.)
| | - Lauren Lepow
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (G.K.N.); (I.T.); (A.W.); (L.L.); (R.B.S.); (R.F.); (D.K.); (E.V.); (A.F.); (I.I.)
| | - Riaz B. Shaik
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (G.K.N.); (I.T.); (A.W.); (L.L.); (R.B.S.); (R.F.); (D.K.); (E.V.); (A.F.); (I.I.)
| | - Rachel Freed
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (G.K.N.); (I.T.); (A.W.); (L.L.); (R.B.S.); (R.F.); (D.K.); (E.V.); (A.F.); (I.I.)
| | - David Kimhy
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (G.K.N.); (I.T.); (A.W.); (L.L.); (R.B.S.); (R.F.); (D.K.); (E.V.); (A.F.); (I.I.)
| | - Robert H. Pietrzak
- U.S. Department of Veterans Affairs, National Center for Posttraumatic Stress Disorder, VA Connecticut Healthcare System, West Haven, CT 06516, USA;
- Department of Psychiatry, Yale School of Medicine, New Haven, CT 06511, USA
- Department of Social and Behavioral Sciences, Yale School of Public Health, New Haven, CT 06520, USA
| | - Eva Velthorst
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (G.K.N.); (I.T.); (A.W.); (L.L.); (R.B.S.); (R.F.); (D.K.); (E.V.); (A.F.); (I.I.)
| | - Adriana Feder
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (G.K.N.); (I.T.); (A.W.); (L.L.); (R.B.S.); (R.F.); (D.K.); (E.V.); (A.F.); (I.I.)
| | - Iliyan Ivanov
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (G.K.N.); (I.T.); (A.W.); (L.L.); (R.B.S.); (R.F.); (D.K.); (E.V.); (A.F.); (I.I.)
| | - Muhammad A. Parvaz
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (G.K.N.); (I.T.); (A.W.); (L.L.); (R.B.S.); (R.F.); (D.K.); (E.V.); (A.F.); (I.I.)
- Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- Correspondence:
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Chou T, D’Orsogna MR. A mathematical model of reward-mediated learning in drug addiction. CHAOS (WOODBURY, N.Y.) 2022; 32:021102. [PMID: 35232044 PMCID: PMC8816520 DOI: 10.1063/5.0082997] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Substances of abuse are known to activate and disrupt neuronal circuits in the brain reward system. We propose a simple and easily interpretable dynamical systems model to describe the neurobiology of drug addiction that incorporates the psychiatric concepts of reward prediction error, drug-induced incentive salience, and opponent process theory. Drug-induced dopamine releases activate a biphasic reward response with pleasurable, positive "a-processes" (euphoria, rush) followed by unpleasant, negative "b-processes" (cravings, withdrawal). Neuroadaptive processes triggered by successive intakes enhance the negative component of the reward response, which the user compensates for by increasing drug dose and/or intake frequency. This positive feedback between physiological changes and drug self-administration leads to habituation, tolerance, and, eventually, to full addiction. Our model gives rise to qualitatively different pathways to addiction that can represent a diverse set of user profiles (genetics, age) and drug potencies. We find that users who have, or neuroadaptively develop, a strong b-process response to drug consumption are most at risk for addiction. Finally, we include possible mechanisms to mitigate withdrawal symptoms, such as through the use of methadone or other auxiliary drugs used in detoxification.
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Affiliation(s)
- Tom Chou
- Department of Computational Medicine, UCLA, Los Angeles, California 90095-1766, USA
| | - Maria R. D’Orsogna
- Department of Mathematics, California State University at Northridge, Los Angeles, California 91130-8313, USA
- Also at: Department of Computational Medicine, UCLA, Los Angeles, CA 90095-1766, USA. Author to whom correspondence should be addressed:
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Awan HA, Aamir A, Diwan MN, Ullah I, Pereira-Sanchez V, Ramalho R, Orsolini L, de Filippis R, Ojeahere MI, Ransing R, Vadsaria AK, Virani S. Internet and Pornography Use During the COVID-19 Pandemic: Presumed Impact and What Can Be Done. Front Psychiatry 2021; 12:623508. [PMID: 33796031 PMCID: PMC8007884 DOI: 10.3389/fpsyt.2021.623508] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 02/08/2021] [Indexed: 12/24/2022] Open
Abstract
The COVID-19 pandemic continues to cause an immense psychosocial strain worldwide. Excessive use of the internet during these psychologically trying times, fueled by physical isolation as a result of lockdowns, has translated into dysfunctional behaviors. A growing body of evidence suggests an unprecedented increase in internet use and consumption of online pornography during the pandemic, and possibly even directly caused by it. In this review, the authors report data from relevant sources to show the rise in pornography use during lockdowns in different countries worldwide. In addition to a brief overview of the neurobiology of internet addiction broadly and problematic online pornography use specifically, similarities with substance use disorders are explained. Further, the current status of the debate about defining diagnostic criteria is discussed. Finally, the review sheds light on the potential detrimental outcomes during the future post-pandemic "re-adaptation," while simultaneously offering preventative and management strategies for harm reduction. The authors conclude that foresightedness with utilizing existing tools and therapies and exercising appropriate amounts of caution could go a long way in addressing the challenges that lie ahead in the post-pandemic era.
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Affiliation(s)
| | - Alifiya Aamir
- Dow University of Health Sciences, Karachi, Pakistan
| | | | - Irfan Ullah
- Kabir Medical College, Gandhara University, Peshawar, Pakistan
| | - Victor Pereira-Sanchez
- Department of Child and Adolescent Psychiatry, School of Medicine, New York University, New York, NY, United States
| | - Rodrigo Ramalho
- Department of Social and Community Health, School of Population Health, University of Auckland, Auckland, New Zealand
| | - Laura Orsolini
- Unit of Clinical Psychiatry, Department of Neurosciences/DIMSC, School of Medicine and Surgery, Polytechnic University of Marche, Ancona, Italy
| | - Renato de Filippis
- Psychiatry Unit, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | | | - Ramdas Ransing
- Bhaktshreshtha Kamalakarpant Laxman Walawalkar Rural Medical College, Kasarwadi, India
| | | | - Sanya Virani
- Veterans Affairs Connecticut Healthcare System, Yale University School of Medicine, West Haven, CT, United States
- School of Medicine Yale University, New Haven, CT, United States
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11
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Wiss D, Brewerton T. Separating the Signal from the Noise: How Psychiatric Diagnoses Can Help Discern Food Addiction from Dietary Restraint. Nutrients 2020; 12:E2937. [PMID: 32992768 PMCID: PMC7600542 DOI: 10.3390/nu12102937] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 09/22/2020] [Accepted: 09/23/2020] [Indexed: 02/07/2023] Open
Abstract
Converging evidence from both animal and human studies have implicated hedonic eating as a driver of both binge eating and obesity. The construct of food addiction has been used to capture pathological eating across clinical and non-clinical populations. There is an ongoing debate regarding the value of a food addiction "diagnosis" among those with eating disorders such as anorexia nervosa binge/purge-type, bulimia nervosa, and binge eating disorder. Much of the food addiction research in eating disorder populations has failed to account for dietary restraint, which can increase addiction-like eating behaviors and may even lead to false positives. Some have argued that the concept of food addiction does more harm than good by encouraging restrictive approaches to eating. Others have shown that a better understanding of the food addiction model can reduce stigma associated with obesity. What is lacking in the literature is a description of a more comprehensive approach to the assessment of food addiction. This should include consideration of dietary restraint, and the presence of symptoms of other psychiatric disorders (substance use, posttraumatic stress, depressive, anxiety, attention deficit hyperactivity) to guide treatments including nutrition interventions. The purpose of this review is to help clinicians identify the symptoms of food addiction (true positives, or "the signal") from the more classic eating pathology (true negatives, or "restraint") that can potentially elevate food addiction scores (false positives, or "the noise"). Three clinical vignettes are presented, designed to aid with the assessment process, case conceptualization, and treatment strategies. The review summarizes logical steps that clinicians can take to contextualize elevated food addiction scores, even when the use of validated research instruments is not practical.
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Affiliation(s)
- David Wiss
- Department of Community Health Sciences, Fielding School of Public Health, University of California Los Angeles, Los Angeles, CA 90025, USA
| | - Timothy Brewerton
- Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, SC 29425, USA;
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12
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Designer Cathinones N-Ethylhexedrone and Buphedrone Show Different In Vitro Neurotoxicity and Mice Behaviour Impairment. Neurotox Res 2020; 39:392-412. [PMID: 32535718 DOI: 10.1007/s12640-020-00229-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 05/18/2020] [Accepted: 05/19/2020] [Indexed: 10/24/2022]
Abstract
N-Ethylhexedrone (NEH) and buphedrone (Buph) are emerging synthetic cathinones (SC) with limited information about their detrimental effects within central nervous system. Objectives: To distinguish mice behavioural changes by NEH and Buph and validate their differential harmful impact on human neurons and microglia. In vivo safety data showed the typical induced behaviour of excitation and stereotypies with 4-64 mg/kg, described for other SC. Buph additionally produced jumping and aggressiveness signs, while NEH caused retropulsion and circling. Transient reduction in body-weight gain was obtained with NEH at 16 mg/kg and induced anxiolytic-like behaviour mainly with Buph. Both drugs generated place preference shift in mice at 4 and 16 mg/kg, suggestive of abuse potential. In addition, mice withdrawn NEH displayed behaviour suggestive of depression, not seen with Buph. When tested at 50-400 μM in human nerve cell lines, NEH and Buph caused neuronal viability loss at 100 μM, but only NEH produced similar results in microglia, indicating different cell susceptibilities. NEH mainly induced microglial late apoptosis/necrosis, while Buph caused early apoptosis. NEH was unique in triggering microglia shorter/thicker branches indicative of cell activation, and more effective in increasing microglial lysosomal biogenesis (100 μM vs. 400 μM Buph), though both produced the same effect on neurons at 400 μM. These findings indicate that NEH and Buph exert neuro-microglia toxicities by distinct mechanisms and highlight NEH as a specific inducer of microglia activation. Buph and NEH showed in vivo/in vitro neurotoxicities but enhanced specific NEH-induced behavioural and neuro-microglia dysfunctionalities pose safety concerns over that of Buph.
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13
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Belisle J, Dixon MR. Behavior and Substance Addictions in Children: A Behavioral Model and Potential Solutions. Pediatr Clin North Am 2020; 67:589-602. [PMID: 32443997 DOI: 10.1016/j.pcl.2020.02.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Behavior and substance use addictions are increasingly prevalent in children with increased risk for substance abuse and mental health diagnoses in adulthood. This article proposes a comprehensive model of addiction to inform research on the prevention and treatment of childhood addiction, emphasizing skills training, mindfulness training, and broader treatment strategies consistent with acceptance and commitment therapy.
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Affiliation(s)
- Jordan Belisle
- Applied Behavior Analysis, Psychology Department, Missouri State University, 901 S National Avenue, Springfield, MO 65897, USA
| | - Mark R Dixon
- Department of Disability and Human Development, University of Illinois at Chicago, Chicago, IL, USA.
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14
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Scariot R, Brunet L, Olsson B, Palinkas M, Regalo SCH, Rebellato NLB, Brancher JA, Torres CP, Diaz-Serrano KV, Küchler EC, Zielak JC. Single nucleotide polymorphisms in dopamine receptor D2 are associated with bruxism and its circadian phenotypes in children. Cranio 2019; 40:152-159. [PMID: 31868570 DOI: 10.1080/08869634.2019.1705629] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Objective: To evaluate the association of bruxism phenotypes with single nucleotide polymorphisms in FKBP5, DRD2, ANKK1, and COMT.Methods: Clinical oral examination was performed to diagnose bruxism phenotypes in 150 children. DNA was collected from saliva. Logistic univariate regression, Chi-square, and Fisher's exact tests were performed (p < 0.05).Results: Bruxism was associated with DRD2 (p = 0.02). Tooth grinding while awake was associated with ANKK1 (p < 0.001), and tooth grinding while asleep was associated with DRD2 in the additive (p = 0.030) and dominant (p = 0.008) model. Tooth clenching while awake was associated with ANKK1 in the additive (p = 0.005) and dominant (p = 0.008) models, whereas tooth clenching while asleep was associated with ANKK1 (p < 0.001) and with COMT in the additive (p = 0.001) and dominant (p = 0.003) models.Discussion: Polymorphisms in DRD2, ANKK1, and COMT are associated with bruxism phenotypes.
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Affiliation(s)
- Rafaela Scariot
- Department of Stomatology, Department of Oral and Maxillofacial Surgery, Federal University of Paraná, Curitiba, Brazil.,School of Health Sciences, Department of Oral and Maxillofacial Surgery, Positivo University, Curitiba, Brazil
| | - Leonardo Brunet
- School of Health Sciences, Department of Oral and Maxillofacial Surgery, Positivo University, Curitiba, Brazil
| | - Bernardo Olsson
- Department of Stomatology, Department of Oral and Maxillofacial Surgery, Federal University of Paraná, Curitiba, Brazil
| | - Marcelo Palinkas
- Department of Pediatric Dentistry, University of São Paulo, Ribeirão Preto, Brazil
| | | | - Nelson Luis Barbosa Rebellato
- Department of Stomatology, Department of Oral and Maxillofacial Surgery, Federal University of Paraná, Curitiba, Brazil
| | - João Armando Brancher
- Department of Stomatology, Department of Oral and Maxillofacial Surgery, Federal University of Paraná, Curitiba, Brazil.,School of Health Sciences, Department of Oral and Maxillofacial Surgery, Positivo University, Curitiba, Brazil
| | - Carolina Paes Torres
- Department of Pediatric Dentistry, University of São Paulo, Ribeirão Preto, Brazil
| | | | | | - João Cesar Zielak
- School of Health Sciences, Department of Oral and Maxillofacial Surgery, Positivo University, Curitiba, Brazil
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15
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Gallant C, Good D. Alcohol misuse and traumatic brain injury: a review of the potential roles of dopaminergic dysfunction and physiological underarousal post-injury. APPLIED NEUROPSYCHOLOGY-ADULT 2019; 28:501-511. [PMID: 31561716 DOI: 10.1080/23279095.2019.1670181] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Although many researchers have demonstrated an increase in alcohol use following traumatic brain injury (TBI), there is also a body of research indicating that alcohol misuse predisposes one to injury and precedes TBI. Accordingly, various mechanisms have been proposed (e.g., self-medication, dampened levels of arousal, dopaminergic dysfunction, etc.) and variable results have emerged. This paper reviews the empirical evidence, for and against, TBI as a risk factor for alcohol misuse. In particular, this paper focuses on the brain-behavior relationships involved and examines the roles of physiological underarousal and dopaminergic dysfunction in the development of alcohol misuse after injury. Alcohol misuse impedes community reintegration among TBI survivors and creates additional rehabilitative challenges. Thus, in order to inform and improve treatment outcomes among this vulnerable population, a deeper understanding of the neural mechanisms implicated is needed.
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Affiliation(s)
- Caitlyn Gallant
- Department of Psychology, Brock University, St. Catharines, ON, Canada
| | - Dawn Good
- Department of Psychology, Brock University, St. Catharines, ON, Canada.,Centre for Neuroscience, Brock University, St. Catharines, ON, Canada
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16
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Arroyo L, Valent D, Carreras R, Peña R, Sabrià J, Velarde A, Bassols A. Housing and road transport modify the brain neurotransmitter systems of pigs: Do pigs raised in different conditions cope differently with unknown environments? PLoS One 2019; 14:e0210406. [PMID: 30650149 PMCID: PMC6334955 DOI: 10.1371/journal.pone.0210406] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 11/06/2018] [Indexed: 12/23/2022] Open
Abstract
How housing and transport conditions may affect welfare in porcine production is a leading topic in livestock research. This study investigated whether pigs present a different neurological response to management conditions and to ascertain whether pigs living partially outdoors cope differently with road transport-associated stress. Twenty-four female pigs were divided in two groups: one living indoors (ID, n = 12) and the other housed combining indoor conditions with 4 hours per day of outdoor pasture (OD, n = 12). After one month, one set of animals from each housing condition were driven in a truck to the slaughterhouse in low-stress conditions (5 min drive, no mixing groups, soft management, LS group, n = 12) or high-stress conditions (2 hours drive, mixing groups, harsh management, HS group, n = 12). At the slaughterhouse, blood was collected, and the prefrontal cortex (PFC) and the hippocampus (HC) dissected. OD pigs had lower serum haptoglobin and increased dopaminergic pathway (DA-system) in the PFC, suggesting that living outdoors increases their wellbeing. HS conditions increased serum creatine kinase (CK) and affected several brain pathways: activation of the noradrenergic (NA-system) and DA -system in the PFC and the activation of the DA-system and an increase in c-Fos as well as a decrease in brain-derived neurotrophic factor (BDNF) in the HC. The serotonergic system (5-HT-system) was mildly altered in both areas. There was an interaction between housing and transport in serum NA and the DA-system in the HC, indicating that living conditions affected the response to stress. Multivariate analysis was able to discriminate the four animal groups. In conclusion, this work indicates that housing conditions and road transport markedly modifies the neurophysiology of pigs, and suggests that animals raised partially outdoors respond differently to transport-associated stress than animals raised indoors, indicating that they cope differently with unknown environments.
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Affiliation(s)
- Laura Arroyo
- Departament de Bioquímica i Biologia Molecular, Facultat de Veterinària, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
| | - Daniel Valent
- Departament de Bioquímica i Biologia Molecular, Facultat de Veterinària, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
| | - Ricard Carreras
- IRTA, Animal Welfare Subprogram, Veïnat de Sies, s/n, Monells, Spain
| | - Raquel Peña
- Departament de Bioquímica i Biologia Molecular, Facultat de Veterinària, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
- Servei de Bioquímica Clínica Veterinària, Facultat de Veterinària, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
| | - Josefa Sabrià
- Departament de Bioquímica i Biologia Molecular, Facultat de Medicina, Institut de Neurociències, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
| | - Antonio Velarde
- IRTA, Animal Welfare Subprogram, Veïnat de Sies, s/n, Monells, Spain
| | - Anna Bassols
- Departament de Bioquímica i Biologia Molecular, Facultat de Veterinària, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
- * E-mail:
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17
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Stolf AR, Müller D, Schuch JB, Akutagava-Martins GC, Guimaraes LSP, Szobot CM, Halpern R, Kessler FHP, Pechansky F, Roman T. Association between the Intron 8 VNTR Polymorphism of the DAT1 Gene and Crack Cocaine Addiction. Neuropsychobiology 2018; 75:141-144. [PMID: 29332099 DOI: 10.1159/000485128] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 11/08/2017] [Indexed: 11/19/2022]
Abstract
BACKGROUND This study aims to compare allele and genotype frequencies of a 30-bp variable number of tandem repeats (VNTR) polymorphism of the DAT1 gene, located at intron 8, between adult crack cocaine users and nonaddicted individuals. Due to its involvement in drug addiction, this gene is a good candidate for molecular studies. METHODS A cross-sectional sample of 239 current adult crack abusers or dependents from in- and outpatient clinics and 211 control individuals was collected in Brazil. They were evaluated using ASRS, ASI-6, WAIS-III, and MINI assessments. DNA samples extracted from whole blood were genotyped for the intron 8 VNTR in DAT1. RESULTS Logistic regression analysis was performed and controlled for gender, age, ethnicity, educational level, and comorbidities of clinical interest (generalized anxiety disorder, suicide risk, major depressive episode, and attention deficit/hyperactivity disorder). This analysis showed that the 6R6R genotype was associated with crack cocaine addiction (OR = 1.844; CI = 1.101-3.089; p = 0.020). CONCLUSIONS Our results are consistent with the role of DAT1 in the neurobiology of drug addiction. Nevertheless, the study of other genes, environmental factors, and their interactions is also important to gain a broader understanding of this condition.
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Affiliation(s)
- Anderson R Stolf
- Center for Drug and Alcohol Research (CPAD), Hospital de Clínicas de Porto Alegre (HCPA), Unidade Álvaro Alvim, Porto Alegre, Brazil
| | - Diana Müller
- Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Jaqueline B Schuch
- Center for Drug and Alcohol Research (CPAD), Hospital de Clínicas de Porto Alegre (HCPA), Unidade Álvaro Alvim, Porto Alegre, Brazil.,Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | | | - Luciano S P Guimaraes
- Center for Drug and Alcohol Research (CPAD), Hospital de Clínicas de Porto Alegre (HCPA), Unidade Álvaro Alvim, Porto Alegre, Brazil
| | - Claudia M Szobot
- Center for Drug and Alcohol Research (CPAD), Hospital de Clínicas de Porto Alegre (HCPA), Unidade Álvaro Alvim, Porto Alegre, Brazil.,Child and Adolescent Psychiatric Service (SPIA), Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Brazil
| | - Ricardo Halpern
- Federal University of Health Sciences of Porto Alegre, Porto Alegre, Brazil
| | - Felix H P Kessler
- Center for Drug and Alcohol Research (CPAD), Hospital de Clínicas de Porto Alegre (HCPA), Unidade Álvaro Alvim, Porto Alegre, Brazil
| | - Flavio Pechansky
- Center for Drug and Alcohol Research (CPAD), Hospital de Clínicas de Porto Alegre (HCPA), Unidade Álvaro Alvim, Porto Alegre, Brazil
| | - Tatiana Roman
- Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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18
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Bystrowska B, Frankowska M, Smaga I, Pomierny-Chamioło L, Filip M. Effects of Cocaine Self-Administration and Its Extinction on the Rat Brain Cannabinoid CB1 and CB2 Receptors. Neurotox Res 2018; 34:547-558. [PMID: 29754307 PMCID: PMC6154179 DOI: 10.1007/s12640-018-9910-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Revised: 04/23/2018] [Accepted: 05/01/2018] [Indexed: 12/18/2022]
Abstract
The aim of this study was to evaluate changes in the expression of cannabinoid type 1 (CB1) and 2 (CB2) receptor proteins in several brain regions in rats undergoing cocaine self-administration and extinction training. We used a triad-yoked procedure to distinguish between the motivational and pharmacological effects of cocaine. Using immunohistochemistry, we observed a significant decrease in CB1 receptor expression in the prefrontal cortex, dorsal striatum, and the basolateral and basomedial amygdala following cocaine (0.5 mg/kg/infusion) self-administration. Increased CB1 receptor expression in the ventral tegmental area in rats with previous cocaine exposure was also found. Following cocaine abstinence after 10 days of extinction training, we detected increases in the expression of CB1 receptors in the substantia nigra in both cocaine groups and in the subregions of the amygdala for only the yoked cocaine controls, while any method of cocaine exposure resulted in a decrease in CB2 receptor expression in the prefrontal cortex (p < 0.01), nucleus accumbens (p < 0.01), and medial globus pallidus (p < 0.01). Our findings further support the idea that the eCB system and CB1 receptors are involved in cocaine-reinforced behaviors. Moreover, we detected a cocaine-evoked adaptation in CB2 receptors in the amygdala, prefrontal cortex, and globus pallidus.
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Affiliation(s)
- Beata Bystrowska
- Department of Toxicology, Jagiellonian University Medical College, Medyczna 9, 30-688, Kraków, Poland.
| | - Małgorzata Frankowska
- Department of Drug Addiction Pharmacology, Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343, Kraków, Poland
| | - Irena Smaga
- Department of Internal Medicine, Jagiellonian University Medical College, Skawińska 8, 31-066, Kraków, Poland
| | - Lucyna Pomierny-Chamioło
- Department of Toxicology, Jagiellonian University Medical College, Medyczna 9, 30-688, Kraków, Poland
| | - Małgorzata Filip
- Department of Drug Addiction Pharmacology, Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343, Kraków, Poland
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19
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Ding S, Zhuge W, Hu J, Yang J, Wang X, Wen F, Wang C, Zhuge Q. Baicalin reverses the impairment of synaptogenesis induced by dopamine burden via the stimulation of GABA AR-TrkB interaction in minimal hepatic encephalopathy. Psychopharmacology (Berl) 2018; 235:1163-1178. [PMID: 29404643 PMCID: PMC5869945 DOI: 10.1007/s00213-018-4833-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2017] [Accepted: 01/08/2018] [Indexed: 01/21/2023]
Abstract
BACKGROUND It has been reported that D1 receptor (D1R) activation reduces GABAA receptor (GABAAR) current, and baicalin (BAI) displays therapeutic efficacy in diseases involving cognitive impairment. METHODS We investigated the mechanisms by which BAI could improve DA-induced minimal hepatic encephalopathy (MHE) using immunoblotting, immunofluorescence, and co-immunoprecipitation. RESULTS BAI did not induce toxicity on the primary cultured neurons. And no obvious toxicity of BAI to the brain was found in rats. DA activated D1R/dopamine and adenosine 3'5'-monophosphate-regulated phospho-protein (DARPP32) to reduce the GABAAR current; BAI treatment did not change the D1R/DARPP32 levels but blocked DA-induced reduction of GABAAR levels in primary cultured neurons. DA decreased the interaction of GABAAR with TrkB and the expression of downstream AKT, which was blocked by BAI treatment. Moreover, BAI reversed the decrease in the expression of GABAAR/TrkB/AKT and prevented the impairment of synaptogenesis and memory deficits in MHE rats. CONCLUSIONS These results suggest that BAI has neuroprotective and synaptoprotective effects on MHE which are not related to upstream D1R/DARPP32 signaling, but to the targeting of downstream GABAAR signaling to TrkB.
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Affiliation(s)
- Saidan Ding
- Zhejiang Provincial Key Laboratory of Aging and Neurological Disease Research, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325000 People’s Republic of China
| | - Weishan Zhuge
- Gastrointestinal Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325000 People’s Republic of China
| | - Jiangnan Hu
- Institute for Healthy Aging, University of North Texas Health Science Center, Fort Worth, TX 76107 USA
| | - Jianjing Yang
- Zhejiang Provincial Key Laboratory of Aging and Neurological Disease Research, Neurosurgery Department, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325000 People’s Republic of China
| | - Xuebao Wang
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, 325000 People’s Republic of China
| | - Fangfang Wen
- Zhejiang Provincial Key Laboratory of Aging and Neurological Disease Research, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325000 People’s Republic of China
| | - Chengde Wang
- Zhejiang Provincial Key Laboratory of Aging and Neurological Disease Research, Neurosurgery Department, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325000 People’s Republic of China
| | - Qichuan Zhuge
- Zhejiang Provincial Key Laboratory of Aging and Neurological Disease Research, Neurosurgery Department, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325000, People's Republic of China.
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20
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Stewart JC, Cramer SC. Genetic Variation and Neuroplasticity: Role in Rehabilitation After Stroke. J Neurol Phys Ther 2017; 41 Suppl 3:S17-S23. [PMID: 28628592 PMCID: PMC5477674 DOI: 10.1097/npt.0000000000000180] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
BACKGROUND AND PURPOSE In many neurologic diagnoses, significant interindividual variability exists in the outcomes of rehabilitation. One factor that may impact response to rehabilitation interventions is genetic variation. Genetic variation refers to the presence of differences in the DNA sequence among individuals in a population. Genetic polymorphisms are variations that occur relatively commonly and, while not disease-causing, can impact the function of biological systems. The purpose of this article is to describe genetic polymorphisms that may impact neuroplasticity, motor learning, and recovery after stroke. SUMMARY OF KEY POINTS Genetic polymorphisms for brain-derived neurotrophic factor (BDNF), dopamine, and apolipoprotein E have been shown to impact neuroplasticity and motor learning. Rehabilitation interventions that rely on the molecular and cellular pathways of these factors may be impacted by the presence of the polymorphism. For example, it has been hypothesized that individuals with the BDNF polymorphism may show a decreased response to neuroplasticity-based interventions, decreased rate of learning, and overall less recovery after stroke. However, research to date has been limited and additional work is needed to fully understand the role of genetic variation in learning and recovery. RECOMMENDATIONS FOR CLINICAL PRACTICE Genetic polymorphisms should be considered as possible predictors or covariates in studies that investigate neuroplasticity, motor learning, or motor recovery after stroke. Future predictive models of stroke recovery will likely include a combination of genetic factors and other traditional factors (eg, age, lesion type, corticospinal tract integrity) to determine an individual's expected response to a specific rehabilitation intervention.
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Affiliation(s)
- Jill Campbell Stewart
- Physical Therapy Program, Department of Exercise Science, University of South Carolina
| | - Steven C. Cramer
- Departments of Neurology, Anatomy & Neurobiology, and Physical Medicine & Rehabilitation, University of California, Irvine
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21
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Single nucleotide polymorphisms in genes of dopaminergic pathways are associated with bruxism. Clin Oral Investig 2017; 22:331-337. [DOI: 10.1007/s00784-017-2117-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 04/10/2017] [Indexed: 11/26/2022]
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22
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Febo M, Blum K, Badgaiyan RD, Perez PD, Colon-Perez LM, Thanos PK, Ferris CF, Kulkarni P, Giordano J, Baron D, Gold MS. Enhanced functional connectivity and volume between cognitive and reward centers of naïve rodent brain produced by pro-dopaminergic agent KB220Z. PLoS One 2017; 12:e0174774. [PMID: 28445527 PMCID: PMC5405923 DOI: 10.1371/journal.pone.0174774] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 03/15/2017] [Indexed: 11/20/2022] Open
Abstract
Dopaminergic reward dysfunction in addictive behaviors is well supported in the literature. There is evidence that alterations in synchronous neural activity between brain regions subserving reward and various cognitive functions may significantly contribute to substance-related disorders. This study presents the first evidence showing that a pro-dopaminergic nutraceutical (KB220Z) significantly enhances, above placebo, functional connectivity between reward and cognitive brain areas in the rat. These include the nucleus accumbens, anterior cingulate gyrus, anterior thalamic nuclei, hippocampus, prelimbic and infralimbic loci. Significant functional connectivity, increased brain connectivity volume recruitment (potentially neuroplasticity), and dopaminergic functionality were found across the brain reward circuitry. Increases in functional connectivity were specific to these regions and were not broadly distributed across the brain. While these initial findings have been observed in drug naïve rodents, this robust, yet selective response implies clinical relevance for addicted individuals at risk for relapse, who show reductions in functional connectivity after protracted withdrawal. Future studies will evaluate KB220Z in animal models of addiction.
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Affiliation(s)
- Marcelo Febo
- Department of Psychiatry & McKnight Brain Institute, University of Florida College of Medicine, Gainesville, Florida, United States of America
| | - Kenneth Blum
- Department of Psychiatry & McKnight Brain Institute, University of Florida College of Medicine, Gainesville, Florida, United States of America
- Department of Psychiatry, Wright State University, Boonshoft School of Medicine, Dayton, Ohio, United States of America
- Department of Holistic Medicine, National Institute for Holistic Addiction Studies, North Miami Beach, Florida, United States of America
- Division of Applied Clinical Research & Education, Dominion Diagnostics, LLC, North Kingstown, Rhode Island, United States of America
- Department of Psychiatry, Keck Medicine University of Southern California, Los Angeles, California, United States of America
| | - Rajendra D. Badgaiyan
- Department of Psychiatry, Wright State University, Boonshoft School of Medicine, Dayton, Ohio, United States of America
| | - Pablo D. Perez
- Department of Psychiatry & McKnight Brain Institute, University of Florida College of Medicine, Gainesville, Florida, United States of America
| | - Luis M. Colon-Perez
- Department of Psychiatry & McKnight Brain Institute, University of Florida College of Medicine, Gainesville, Florida, United States of America
| | - Panayotis K. Thanos
- Research Institute on Addictions, University at Buffalo, Buffalo, New York, United States of America
| | - Craig F. Ferris
- Center for Translational Neuroimaging, Department of Psychology and Pharmaceutical Sciences, Northeastern University, Boston, Massachusetts, United States of America
| | - Praveen Kulkarni
- Center for Translational Neuroimaging, Department of Psychology and Pharmaceutical Sciences, Northeastern University, Boston, Massachusetts, United States of America
| | - John Giordano
- Department of Holistic Medicine, National Institute for Holistic Addiction Studies, North Miami Beach, Florida, United States of America
| | - David Baron
- Department of Psychiatry, Keck Medicine University of Southern California, Los Angeles, California, United States of America
| | - Mark S. Gold
- Department of Psychiatry & McKnight Brain Institute, University of Florida College of Medicine, Gainesville, Florida, United States of America
- Department of Psychiatry, Keck Medicine University of Southern California, Los Angeles, California, United States of America
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Anderson MR, Miller L, Wickramaratne P, Svob C, Odgerel Z, Zhao R, Weissman MM. Genetic Correlates of Spirituality/Religion and Depression: A Study in Offspring and Grandchildren at High and Low Familial Risk for Depression. ACTA ACUST UNITED AC 2017; 4:43-63. [PMID: 29057276 DOI: 10.1037/scp0000125] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
RATIONALE Possible genetic correlates of spirituality and depression have been identified in community samples. We investigate some of the previously identified candidates in a sample of families at both high and low-risk for depression. METHOD Offspring and grandchildren of individuals at high and low-risk for depression, participating in a multi-wave thirty-year longitudinal study, were assessed for seven SNPS drawn from four single gene candidates associated with systems implicated in both depression and spirituality: Serotonin (5-HT1B and 5-HT2A), Dopamine (DRD2), Oxytocin (OT) and Monoamine Vesicular Transporter (VMAT1). RESULTS Dopamine (DRD2) Serotonin (5-HT1B), their Transporter (VMAT1) and Oxytocin (OXTR) were positively associated with a high level of importance of spirituality or religion (S/R) in the group at low familial risk for depression. DRD2 minor allele was associated with both lifetime major depressive disorder (MDD) and spirituality in the low-risk group for depression. No SNPs were related to S/R in the group at high familial risk for depression. OXTR was associated with lifetime MDD in the full sample. CONCLUSION Genes for dopamine, serotonin, their vesicular transporter, and oxytocin may be associated with S/R in people at low familial risk for depression. Genes for dopamine may be associated both with S/R and increased risk for depression in people at low-risk for depression, suggesting a common pathway or physiology to mild to moderate depression. MDD is associated with oxytocin across risk groups. In the high-risk group, phenotypic expression of S/R may be suppressed. IMPLICATIONS The shared association of DRD2 by S/R and depression, generally found to be inversely related, calls for further research on their common physiological pathways, and the phenotypic expression of these pathways based upon use and environment. Prevention for offspring at high familial risk for depression might include support for the development of child spirituality.
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Affiliation(s)
| | - Lisa Miller
- Teachers College, Columbia University, New York, NY
| | - Priya Wickramaratne
- Department of Psychiatry, College of Physicians and Surgeons, Columbia University, New York, NY, USA.,Division of Epidemiology, New York State Psychiatric Institute, New York, NY, USA.,Mailman School of Public Health, Columbia University, New York, NY, USA
| | - Connie Svob
- Department of Psychiatry, College of Physicians and Surgeons, Columbia University, New York, NY, USA.,Division of Epidemiology, New York State Psychiatric Institute, New York, NY, USA
| | - Zagaa Odgerel
- Department of Psychiatry, College of Physicians and Surgeons, Columbia University, New York, NY, USA.,Division of Epidemiology, New York State Psychiatric Institute, New York, NY, USA
| | - Ruixin Zhao
- Department of Psychiatry, College of Physicians and Surgeons, Columbia University, New York, NY, USA.,Division of Epidemiology, New York State Psychiatric Institute, New York, NY, USA
| | - Myrna M Weissman
- Department of Psychiatry, College of Physicians and Surgeons, Columbia University, New York, NY, USA.,Division of Epidemiology, New York State Psychiatric Institute, New York, NY, USA.,Mailman School of Public Health, Columbia University, New York, NY, USA
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Blum K, Madigan MA, Fried L, Braverman ER, Giordano J, Badgaiyan RD. Coupling Genetic Addiction Risk Score (GARS) and Pro Dopamine Regulation (KB220) to Combat Substance Use Disorder (SUD). ACTA ACUST UNITED AC 2017; 1. [PMID: 29399668 DOI: 10.19080/gjarm.2017.01.555556] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Kenneth Blum
- Department of Psychiatry & McKnight Brain Institute, University of Florida College of Medicine, USA.,Department of Psychiatry and Behavioral Sciences, Keck Medicine University of Southern California, USA.,Division of Applied Clinical Research & Education, Dominion Diagnostics, USA.,Department of Neurogenetics, Igene, USA.,National Institute for Holistic Addiction Studies, USA.,Department of Clinical Neurology, Path Foundation NY, USA.,Division of Neuroscience Based Addiction Therapy, The Shores Treatment & Recovery Center, USA.,Eötvös Loránd University, Institute of Psychology, Europe.,Department of Psychiatry, Wright State University Boonshoft School of Medicine and Dayton VA Medical Center, US.,Division of Reward Deficiency Syndrome, Nupathways, Inc., Innsbrook, MO, USA
| | | | - Lyle Fried
- Division of Neuroscience Based Addiction Therapy, The Shores Treatment & Recovery Center, USA
| | | | - John Giordano
- National Institute for Holistic Addiction Studies, USA
| | - Rajendra D Badgaiyan
- Department of Psychiatry, Wright State University Boonshoft School of Medicine and Dayton VA Medical Center, US
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25
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Imperatori C, Valenti EM, Della Marca G, Amoroso N, Massullo C, Carbone GA, Maestoso G, Quintiliani MI, Contardi A, Farina B. Coping food craving with neurofeedback. Evaluation of the usefulness of alpha/theta training in a non-clinical sample. Int J Psychophysiol 2017; 112:89-97. [DOI: 10.1016/j.ijpsycho.2016.11.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Revised: 11/08/2016] [Accepted: 11/11/2016] [Indexed: 11/25/2022]
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de Haan P, Klein HC, 't Hart BA. Autoimmune Aspects of Neurodegenerative and Psychiatric Diseases: A Template for Innovative Therapy. Front Psychiatry 2017; 8:46. [PMID: 28421005 PMCID: PMC5378775 DOI: 10.3389/fpsyt.2017.00046] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 03/08/2017] [Indexed: 12/13/2022] Open
Abstract
Neurodegenerative and psychiatric diseases (NPDs) are today's most important group of diseases, surpassing both atherosclerotic cardiovascular disease and cancer in morbidity incidence. Although NPDs have a dramatic impact on our society because of their high incidence, mortality, and severe debilitating character, remarkably few effective interventions have become available. The current treatments, if available, comprise the lifelong intake of general immunosuppressants to delay disease progression or neurotransmitter antagonists/agonists to dampen undesired behaviors. The long-term usage of such medication, however, coincides with often severe adverse side effects. There is, therefore, an urgent need for safe and effective treatments for these diseases. Here, we discuss that many NPDs coincide with subtle chronic or flaring brain inflammation sometimes escalating with infiltrations of lymphocytes in the inflamed brain parts causing mild to severe or even lethal brain damage. Thus, NPDs show all features of autoimmune diseases. In this review, we postulate that NPDs resemble autoimmune-driven inflammatory diseases in many aspects and may belong to the same disease spectrum. Just like in autoimmune diseases, NPD symptoms basically are manifestations of a chronic self-sustaining inflammatory process with detrimental consequences for the patient. Specific inhibition of the destructive immune responses in the brain, leaving the patient's immune system intact, would be the ultimate solution to cure patients from the disease. To reach this goal, the primary targets, e.g., the primary self-antigens (pSAgs) of the patient's chronic (auto)immune response, need to be identified. For a few major NPDs, immunological studies led to the identification of the pSAgs involved in the autoimmune damage of specific brain parts. However, further research is needed to complete the list of pSAgs for all NPDs. Such immunological studies will not only provide crucial insights into NPD pathogenesis but also ultimately enable the development of a new generation of safe and effective immunotherapies for NPDs. Interventions that will dramatically improve the life expectancy and quality of life of individual patients and, moreover, will significantly reduce the health-care costs of the society in general.
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Affiliation(s)
| | - Hans C Klein
- Department of Psychiatry and Medical Imaging Centre, University Medical Centre Groningen, Groningen, Netherlands
| | - Bert A 't Hart
- Department of Immunobiology, Biomedical Primate Research Centre, Rijswijk, Netherlands
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Blum K, Febo M, Badgaiyan RD, Demetrovics Z, Simpatico T, Fahlke C, Li M, Dushaj K, Gold MS. Common Neurogenetic Diagnosis and Meso-Limbic Manipulation of Hypodopaminergic Function in Reward Deficiency Syndrome (RDS): Changing the Recovery Landscape. Curr Neuropharmacol 2017; 15:184-194. [PMID: 27174576 PMCID: PMC5327445 DOI: 10.2174/1570159x13666160512150918] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 04/11/2016] [Accepted: 04/21/2016] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND In 1990, Blum and associates provided the first confirmed genetic link between the DRD2 polymorphisms and alcoholism. This finding was based on an earlier conceptual framework, which served as a blueprint for their seminal genetic association discovery they termed "Brain Reward Cascade." These findings were followed by a new way of understanding all addictive behaviors (substance and non-substance) termed "Reward Deficiency Syndrome" (RDS). RDS incorporates a complex multifaceted array of inheritable behaviors that are polygenic. OBJECTIVE In this review article, we attempt to clarify these terms and provide a working model to accurately diagnose and treat these unwanted behaviors. METHOD We are hereby proposing the development of a translational model we term "Reward Deficiency Solution System™" that incorporates neurogenetic testing and meso-limbic manipulation of a "hypodopaminergic" trait/state, which provides dopamine agonistic therapy (DAT) as well as reduced "dopamine resistance," while embracing "dopamine homeostasis." RESULT The result is better recovery and relapse prevention, despite DNA antecedents, which could impact the recovery process and relapse. Understanding the commonality of mental illness will transform erroneous labeling based on symptomatology, into a genetic and anatomical etiology. WC: 184.
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Affiliation(s)
- Kenneth Blum
- Department of Psychiatry, University of Florida College of Medicine and McKnight Brain Institute, Gainesville, FL, USA
- Department of Nutrigenomics, RDSolutions, Inc., Salt Lake City, UT, USA
- Department of Psychology, Eotvos Lorand University, Budapest, Hungary
- PATH Foundation NY, New York, NY, USA
- Division of Neuroscience Research and Addiction Therapy, The Shores Treatment and Recovery, Port Saint Lucie, FL, USA
| | - Marcelo Febo
- Department of Psychiatry, University of Florida College of Medicine and McKnight Brain Institute, Gainesville, FL, USA
| | - Rajendra D. Badgaiyan
- Division of Neuroimaging, Department of Psychiatry, University of Minnesota College of Medicine, Minneapolis, MN, USA;
| | - Zsolt Demetrovics
- Department of Psychology, Eotvos Lorand University, Budapest, Hungary
| | - Thomas Simpatico
- Department of Psychiatry, University of Vermont, Burlington, VT, USA
| | - Claudia Fahlke
- Department of Psychology, University of Gothenburg, Göteborg, Sweden;
| | - Oscar-Berman M
- Departments of Psychiatry and Anatomy & Neurobiology, Boston University School of Medicine and Boston VA Healthcare System, Boston, MA, USA
| | - Mona Li
- PATH Foundation NY, New York, NY, USA
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29
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How psychoactive drugs shape human culture: A multi-disciplinary perspective. Brain Res Bull 2016; 126:138-151. [DOI: 10.1016/j.brainresbull.2016.04.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 04/06/2016] [Accepted: 04/11/2016] [Indexed: 12/23/2022]
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Wingo T, Nesil T, Choi JS, Li MD. Novelty Seeking and Drug Addiction in Humans and Animals: From Behavior to Molecules. J Neuroimmune Pharmacol 2016; 11:456-70. [PMID: 26481371 PMCID: PMC4837094 DOI: 10.1007/s11481-015-9636-7] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Accepted: 10/13/2015] [Indexed: 12/21/2022]
Abstract
Global treatment of drug addiction costs society billions of dollars annually, but current psychopharmacological therapies have not been successful at desired rates. The increasing number of individuals suffering from substance abuse has turned attention to what makes some people more vulnerable to drug addiction than others. One personality trait that stands out as a contributing factor is novelty seeking. Novelty seeking, affected by both genetic and environmental factors, is defined as the tendency to desire novel stimuli and environments. It can be measured in humans through questionnaires and in rodents using behavioral tasks. On the behavioral level, both human and rodent studies demonstrate that high novelty seeking can predict the initiation of drug use and a transition to compulsive drug use and create a propensity to relapse. These predictions are valid for several drugs of abuse, such as alcohol, nicotine, cocaine, amphetamine, and opiates. On the molecular level, both novelty seeking and addiction are modulated by the central reward system in the brain. Dopamine is the primary neurotransmitter involved in the overlapping neural substrates of both parameters. In sum, the novelty-seeking trait can be valuable for predicting individual vulnerability to drug addiction and for generating successful treatment for patients with substance abuse disorders.
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Affiliation(s)
- Taylor Wingo
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, 450 Ray C Hunt Drive, Suite G-170, Charlottesville, VA, 22903, USA
| | - Tanseli Nesil
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, 450 Ray C Hunt Drive, Suite G-170, Charlottesville, VA, 22903, USA
| | - Jung-Seok Choi
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, 450 Ray C Hunt Drive, Suite G-170, Charlottesville, VA, 22903, USA
- Department of Psychiatry, SMG-SNU Boramae Medical Center and Department of Psychiatry and Behavioral Science, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Ming D Li
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, 450 Ray C Hunt Drive, Suite G-170, Charlottesville, VA, 22903, USA.
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Affiliation(s)
- Christian A Koch
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, University of Mississippi Medical Center, 2500 N State Street, Jackson, MS, 39216, USA.
- G.V. (Sonny) Montgomery VA Medical Center, Jackson, MS, USA.
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Neurofeedback Training as a New Method in Treatment of Crystal Methamphetamine Dependent Patients: A Preliminary Study. Appl Psychophysiol Biofeedback 2016; 40:151-61. [PMID: 25894106 DOI: 10.1007/s10484-015-9281-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
This study aimed to compare the effectiveness of neurofeedback (NFB) plus pharmacotherapy with pharmacotherapy alone, on addiction severity, mental health, and quality of life in crystal methamphetamine-dependent (CMD) patients. The study included 100 CMD patients undergoing a medical treatment who volunteered for this randomized controlled trial. After being evaluated by a battery of questionnaires that included addiction severity index questionnaire, Symptoms Check List 90 version, and World Health Organization Quality of Life, the participants were randomly assigned to an experimental or a control group. The experimental group received thirty 50-min sessions of NFB in addition to their usual medication over a 2-month period; meanwhile, the control group received only their usual medication. In accordance with this study's pre-test-post-test design, both study groups were evaluated again after completing their respective treatment regimens. Multivariate analysis of covariance showed the experimental group to have lower severity of addiction, better psychological health, and better quality of life in than the control group. The differences between the two groups were statistically significant. These finding suggest that NFB can be used to improve the effectiveness of treatment results in CMD patients.
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Cadoni C. Fischer 344 and Lewis Rat Strains as a Model of Genetic Vulnerability to Drug Addiction. Front Neurosci 2016; 10:13. [PMID: 26903787 PMCID: PMC4746315 DOI: 10.3389/fnins.2016.00013] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 01/11/2016] [Indexed: 01/02/2023] Open
Abstract
Today it is well acknowledged that both nature and nurture play important roles in the genesis of psychopathologies, including drug addiction. Increasing evidence suggests that genetic factors contribute for at least 40–60% of the variation in liability to drug dependence. Human genetic studies suggest that multiple genes of small effect, rather than single genes, contribute to the genesis of behavioral psychopathologies. Therefore, the use of inbred rat strains might provide a valuable tool to identify differences, linked to genotype, important in liability to addiction and related disorders. In this regard, Lewis and Fischer 344 inbred rats have been proposed as a model of genetic vulnerability to drug addiction, given their innate differences in sensitivity to the reinforcing and rewarding effects of drugs of abuse, as well their different responsiveness to stressful stimuli. This review will provide evidence in support of this model for the study of the genetic influence on addiction vulnerability, with particular emphasis on differences in mesolimbic dopamine (DA) transmission, rewarding and emotional function. It will be highlighted that Lewis and Fischer 344 rats differ not only in several indices of DA transmission and adaptive changes following repeated drug exposure, but also in hypothalamic-pituitary-adrenal (HPA) axis responsiveness, influencing not only the ability of the individual to cope with stressful events, but also interfering with rewarding and motivational processes, given the influence of corticosteroids on dopamine neuron functionality. Further differences between the two strains, as impulsivity or anxiousness, might contribute to their different proneness to addiction, and likely these features might be linked to their different DA neurotransmission plasticity. Although differences in other neurotransmitter systems might deserve further investigation, results from the reviewed studies might open new vistas in understanding aberrant deviations in reward and motivational functions.
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Affiliation(s)
- Cristina Cadoni
- Institute of Neuroscience, Cagliari Section, Department of Biomedical Sciences, National Research Council of ItalyCagliari, Italy; Centre of Excellence "Neurobiology of Dependence", University of CagliariCagliari, Italy
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Love T, Laier C, Brand M, Hatch L, Hajela R. Neuroscience of Internet Pornography Addiction: A Review and Update. Behav Sci (Basel) 2015; 5:388-433. [PMID: 26393658 PMCID: PMC4600144 DOI: 10.3390/bs5030388] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 08/29/2015] [Accepted: 09/08/2015] [Indexed: 02/07/2023] Open
Abstract
Many recognize that several behaviors potentially affecting the reward circuitry in human brains lead to a loss of control and other symptoms of addiction in at least some individuals. Regarding Internet addiction, neuroscientific research supports the assumption that underlying neural processes are similar to substance addiction. The American Psychiatric Association (APA) has recognized one such Internet related behavior, Internet gaming, as a potential addictive disorder warranting further study, in the 2013 revision of their Diagnostic and Statistical Manual. Other Internet related behaviors, e.g., Internet pornography use, were not covered. Within this review, we give a summary of the concepts proposed underlying addiction and give an overview about neuroscientific studies on Internet addiction and Internet gaming disorder. Moreover, we reviewed available neuroscientific literature on Internet pornography addiction and connect the results to the addiction model. The review leads to the conclusion that Internet pornography addiction fits into the addiction framework and shares similar basic mechanisms with substance addiction. Together with studies on Internet addiction and Internet Gaming Disorder we see strong evidence for considering addictive Internet behaviors as behavioral addiction. Future research needs to address whether or not there are specific differences between substance and behavioral addiction.
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Affiliation(s)
- Todd Love
- Society for the Advancement of Sexual Health, Ardmore, PA 19003, USA.
| | - Christian Laier
- Department of General Psychology: Cognition, University of Duisburg-Essen, Duisburg 47057, Germany.
| | - Matthias Brand
- Department of General Psychology: Cognition, University of Duisburg-Essen, Duisburg 47057, Germany.
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen 45141, Germany.
| | - Linda Hatch
- Private Practice, Santa Barbara, CA 93103, USA.
| | - Raju Hajela
- Health Upwardly Mobile Inc., Calgary, AB T2S 0J2, Canada.
- Diagnostic and Descriptive Terminology Action Group (DDTAG), American Society of Addiction Medicine (ASAM), Chevy Chase, MD 93101, USA.
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Lindahl AJ, MacMahon DG. The agony of the agonists: a review of impulsivity and withdrawal syndromes in Parkinson's disease treatment. FUTURE NEUROLOGY 2015. [DOI: 10.2217/fnl.15.22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The introduction of dopamine agonists was a welcome development in the treatment of Parkinson's disease. However, their history has been somewhat checkered with concerns about their side effects including sudden onset of sleep and ‘sleep attacks’ the development of fibrotic side effects with ergot-derived agents; and most recently, the emergence of impulse control disorders. Furthermore, those who develop these behaviors are those most likely to suffer distressing side effects on their withdrawal: the so-called ‘dopamine agonist withdrawal syndrome’ (DAWS). This review examines this complex area and some suggested strategies to avoid and manage these phenomena, and concludes with some discussion of the future agenda for improving the understanding and management of these conditions.
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Affiliation(s)
- Andrea J Lindahl
- University Hospitals Coventry & Warwickshire NHS Trust, University Hospital, Clifford Bridge Road, Coventry CV2 2DX, UK
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Blum K, Febo M, Smith DE, Roy AK, Demetrovics Z, Cronjé FJ, Femino J, Agan G, Fratantonio JL, Pandey SC, Badgaiyan RD, Gold MS. Neurogenetic and epigenetic correlates of adolescent predisposition to and risk for addictive behaviors as a function of prefrontal cortex dysregulation. J Child Adolesc Psychopharmacol 2015; 25:286-92. [PMID: 25919973 PMCID: PMC4442554 DOI: 10.1089/cap.2014.0146] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
As addiction professionals, we are becoming increasingly concerned about preteenagers and young adults' involvement with substance abuse as a way of relieving stress and anger. The turbulent underdeveloped central nervous system, especially in the prefrontal cortex (PFC), provides impetus to not only continue important neuroimaging studies in both human and animal models, but also to encourage preventive measures and cautions embraced by governmental and social media outlets. It is well known that before people reach their 20s, PFC development is undergoing significant changes and, as such, hijacks appropriate decision making in this population. We are further proposing that early genetic testing for addiction risk alleles will offer important information that could potentially be utilized by their parents and caregivers prior to use of psychoactive drugs by these youth. Understandably, family history, parenting styles, and attachment may be modified by various reward genes, including the known bonding substances oxytocin/vasopressin, which effect dopaminergic function. Well-characterized neuroimaging studies continue to reflect region-specific differential responses to drugs and food (including other non-substance-addictive behaviors) via either "surfeit" or "deficit." With this in mind, we hereby propose a "reward deficiency solution system" that combines early genetic risk diagnosis, medical monitoring, and nutrigenomic dopamine agonist modalities to combat this significant global dilemma that is preventing our youth from leading normal productive lives, which will in turn make them happier.
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Affiliation(s)
- Kenneth Blum
- Department of Psychiatry and McKnight Brain Institute, University of Florida, College of Medicine, Gainesville, Florida.,Division of Addiction Services, Dominion Diagnostics, LLC, North Kingstown, Rhode Island.,Department of Addiction Research & Therapy, Malibu Beach Recovery Center, Malibu Beach, California.,Human Integrative Services & Translational Science, Department of Psychiatry, University of Vermont College of Medicine, Burlington, Vermont
| | - Marcelo Febo
- Department of Psychiatry and McKnight Brain Institute, University of Florida, College of Medicine, Gainesville, Florida
| | - David E. Smith
- Division of Addiction Services, Dominion Diagnostics, LLC, North Kingstown, Rhode Island.,Institute of Health & Aging, University of California, San Francisco, California
| | | | - Zsolt Demetrovics
- Department of Clinical Psychology and Addiction, Institute of Psychology, Eötvös Loránd University, Budapest, Hungary
| | | | - John Femino
- Department of Clinical Medicine, Meadows Edge Recovery Center, North Kingston, Rhode Island
| | - Gozde Agan
- Division of Addiction Services, Dominion Diagnostics, LLC, North Kingstown, Rhode Island
| | - James L. Fratantonio
- Division of Applied Clinical Research, Dominion Diagnostics, LLC, North Kingstown, Rhode Island
| | - Subhash C. Pandey
- Department of Psychiatry, University of Illinois at Chicago and Jesse Brown VA Medical Center, Chicago, Illinois
| | - Rajendra D. Badgaiyan
- Department of Psychiatry, University of Minnesota College of Medicine, Minneapolis, Minnesota
| | - Mark S. Gold
- Department of Psychiatry and McKnight Brain Institute, University of Florida, College of Medicine, Gainesville, Florida.,Department of Addiction Research & Therapy, Malibu Beach Recovery Center, Malibu Beach, California
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Blum K, Febo M, Thanos PK, Baron D, Fratantonio J, Gold M. Clinically Combating Reward Deficiency Syndrome (RDS) with Dopamine Agonist Therapy as a Paradigm Shift: Dopamine for Dinner? Mol Neurobiol 2015; 52:1862-1869. [PMID: 25750061 PMCID: PMC4586005 DOI: 10.1007/s12035-015-9110-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 01/21/2015] [Indexed: 01/23/2023]
Abstract
Everyday, there are several millions of people that are increasingly unable to combat their frustrating and even fatal romance with getting high and/or experiencing “normal” feelings of well-being. In the USA, the FDA has approved pharmaceuticals for drug and alcohol abuse: tobacco and nicotine replacement therapy. The National Institute on Drug Abuse (NIDA) and the National Institute on Alcohol Abuse and Alcoholism (NIAAA) remarkably continue to provide an increasing understanding of the intricate functions of brain reward circuitry through sophisticated neuroimaging and molecular genetic applied technology. Similar work is intensely investigated on a worldwide basis with enhanced clarity and increased interaction between not only individual scientists but across many disciplines. However, while it is universally agreed that dopamine is a major neurotransmitter in terms of reward dependence, there remains controversy regarding how to modulate its role clinically to treat and prevent relapse for both substance and non-substance-related addictive behaviors. While the existing FDA-approved medications promote blocking dopamine, we argue that a more prudent paradigm shift should be biphasic—short-term blockade and long-term upregulation, enhancing functional connectivity of brain reward circuits.
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Affiliation(s)
- Kenneth Blum
- Department of Psychiatry and McKnight Brain Institute, College of Medicine, University of Florida, P. O. Box 100256, Gainesville, FL 32610-0256 USA
- Human Integrated Services Unit, Center for Clinical and Translational Science, Department of Psychiatry, College of Medicine, University of Vermont, Burlington, VT USA
- Division of Applied Clinical Research, Dominion Diagnostics, LLC, North Kingstown, RI USA
- Department of Addiction Research and Therapy, Malibu Beach Recovery Center, Malibu, CA USA
| | - Marcelo Febo
- Department of Psychiatry and McKnight Brain Institute, College of Medicine, University of Florida, P. O. Box 100256, Gainesville, FL 32610-0256 USA
| | - Panayotis K. Thanos
- Behavior Neuropharmacology and Neuroimaging Laboratory, Department of Psychology, SUNY at Stony Brook, Stony Brook, NY USA
| | - David Baron
- Department of Psychiatry, Keck School of Medicine, University of Southern California, Los Angeles, CA USA
- Keck School of Medicine, University of Southern California, Los Angeles, CA USA
| | - James Fratantonio
- Division of Applied Clinical Research, Dominion Diagnostics, LLC, North Kingstown, RI USA
| | - Mark Gold
- Department of Psychiatry and McKnight Brain Institute, College of Medicine, University of Florida, P. O. Box 100256, Gainesville, FL 32610-0256 USA
- Department of Research, Rivermernd Health, Atlanta, GA USA
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Heng BC, Aubel D, Fussenegger M. Prosthetic gene networks as an alternative to standard pharmacotherapies for metabolic disorders. Curr Opin Biotechnol 2015; 35:37-45. [PMID: 25679308 DOI: 10.1016/j.copbio.2015.01.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 01/28/2015] [Accepted: 01/28/2015] [Indexed: 12/19/2022]
Abstract
Synthetic biology makes inroads into clinical therapy with the debut of closed-loop prosthetic gene networks specifically designed to treat human diseases. Prosthetic networks are synthetic sensor/effector devices that could functionally integrate and interface with host metabolism to monitor disease states and coordinate appropriate therapeutic responses in a self-sufficient, timely and automatic manner. Prosthetic networks hold particular promise for the current global epidemic of closely interrelated metabolic disorders encompassing obesity, type 2 diabetes, hypertension and hyperlipidaemia, which arise from the unhealthy lifestyle and dietary factors in the modern urbanised world. This review will critically examine the various attempts at constructing prosthetic gene networks for the treatment of these metabolic disorders, as well as provide insight into future developments in the field.
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Affiliation(s)
- Boon Chin Heng
- Department of Biological Sciences, Sunway University, Bandar Sunway 47500, Selangor Darul Ehsan, Malaysia; Department of Biosystems Science and Engineering (D-BSSE), ETH Zurich, Mattenstrasse 26, CH-4058 Basel, Switzerland
| | - Dominique Aubel
- IUTA Département Génie Biologique, Université Claude Bernard Lyon 1, Boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France
| | - Martin Fussenegger
- Department of Biosystems Science and Engineering (D-BSSE), ETH Zurich, Mattenstrasse 26, CH-4058 Basel, Switzerland; Faculty of Science, University of Basel, Mattenstrasse 26, CH-4058 Basel, Switzerland.
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Wydra K, Gołembiowska K, Suder A, Kamińska K, Fuxe K, Filip M. On the role of adenosine (A)₂A receptors in cocaine-induced reward: a pharmacological and neurochemical analysis in rats. Psychopharmacology (Berl) 2015; 232:421-35. [PMID: 25027583 DOI: 10.1007/s00213-014-3675-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Accepted: 06/27/2014] [Indexed: 10/25/2022]
Abstract
RATIONALE Several studies have suggested the inhibitory control of adenosine (A)2A receptor stimulation in cocaine-induced behavioral actions. OBJECTIVES A combination of systemic or local drug injections and in vivo neurochemical analysis investigated A2A receptors in cocaine and food reward. METHODS Rats, trained to self-administer cocaine or food, were tested with the selective A2A receptor antagonists KW 6002 and SCH 58261 or the selective A2A receptor agonist CGS 21680. Extracellular dopamine, glutamate, and GABA levels in the nucleus accumbens and ventral pallidum were determined following intra-accumbal CGS 21680 administration during cocaine self-administration. RESULTS Neither KW 6002 nor SCH 58261 (0.25-1 mg/kg) altered cocaine self-administration (0.125-0.5 mg/kg/infusion), while CGS 21680 (0.2-0.4 mg/kg) produced a downward shift in the cocaine dose-response curve under a fixed ratio schedule of reinforcement and decreased the cocaine breaking point. CGS 21680 blocked also operant responding for food, while the A2A receptor antagonists were inactive. Local steady-state infusion of CGS 21680 (10 μM) during cocaine self-administration increased the active level pressing that was accompanied with reduced dopamine and increased GABA in the nucleus accumbens in the absence of changes in GABA and glutamate levels in the ventral pallidum. Pretreatment with systemic KW 6002 counteracted the increases in number of cocaine infusions seen after intra-accumbal administration of CGS 21680. CONCLUSION The findings support a role of A2A receptors in modulating goal-maintained behaviors. They also indicate that increased accumbal GABA release involving an antagonistic A2A-D2 receptor interaction can participate in mediating the inhibitory effects of the A2A agonist on cocaine reward.
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Affiliation(s)
- Karolina Wydra
- Laboratory of Drug Addiction Pharmacology, Department of Pharmacology, Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343, Kraków, Poland
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Blum K, Liu Y, Wang W, Wang Y, Zhang Y, Oscar-Berman M, Smolen A, Febo M, Han D, Simpatico T, Cronjé FJ, Demetrovics Z, Gold MS. rsfMRI effects of KB220Z™ on neural pathways in reward circuitry of abstinent genotyped heroin addicts. Postgrad Med 2014; 127:232-41. [PMID: 25526228 DOI: 10.1080/00325481.2015.994879] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Recently, Willuhn et al. reported that cocaine use and even non-substance-related addictive behavior increases as dopaminergic function is reduced. Chronic cocaine exposure has been associated with decreases in D2/D3 receptors and was also associated with lower activation of cues in occipital cortex and cerebellum, in a recent PET study by Volkow's et al. Therefore, treatment strategies, like dopamine agonist therapy, that might conserve dopamine function may be an interesting approach to relapse prevention in psychoactive drug and behavioral addictions. To this aim, we evaluated the effect of KB220Z™ on reward circuitry of 10 heroin addicts undergoing protracted abstinence (average 16.9 months). In a randomized placebo-controlled crossover study of KB220Z, five subjects completed a triple-blinded experiment in which the subject, the person administering the treatment, and the person evaluating the response to treatment were blinded to the treatment that any particular subject was receiving. In addition, nine subjects were genotyped utilizing the GARSDX™ test. We preliminarily report that KB220Z induced an increase in BOLD activation in caudate-accumbens-dopaminergic pathways compared to placebo following 1-hour acute administration. Furthermore, KB220Z also reduced resting-state activity in the putamen of abstinent heroin addicts. In the second phase of this pilot study of all 10 abstinent heroin-dependent subjects, we observed that three brain regions of interest were significantly activated from resting state by KB220Z compared to placebo (p < 0.05). Increased functional connectivity was observed in a putative network that included the dorsal anterior cingulate, medial frontal gyrus, nucleus accumbens, posterior cingulate, occipital cortical areas, and cerebellum. These results and other quantitative electroencephalogy (qEEG) study results suggest a putative anti-craving/anti-relapse role of KB220Z in addiction by direct or indirect dopaminergic interaction. Due to small sample size, we caution definitive interpretation of these preliminary results, and confirmation with additional research and ongoing rodent and human studies of KB220Z is required.
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Affiliation(s)
- Kenneth Blum
- Department of Psychiatry & McKnight Brain Institute, University of Florida, College of Medicine , Gainesville, FL , USA
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Davis C, Loxton NJ. A psycho-genetic study of hedonic responsiveness in relation to "food addiction". Nutrients 2014; 6:4338-53. [PMID: 25325253 PMCID: PMC4210920 DOI: 10.3390/nu6104338] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 09/29/2014] [Accepted: 10/01/2014] [Indexed: 12/28/2022] Open
Abstract
While food addiction has no formally-recognized definition, it is typically operationalized according to the diagnostic principles established by the Yale Food Addiction Scale-an inventory based on the symptom criteria for substance dependence in the DSM-IV. Currently, there is little biologically-based research investigating the risk factors for food addiction. What does exist has focused almost exclusively on dopaminergic reward pathways in the brain. While brain opioid signaling has also been strongly implicated in the control of food intake, there is no research examining this neural circuitry in the association with food addiction. The purpose of the study was therefore to test a model predicting that a stronger activation potential of opioid circuitry-as indicated by the functional A118G marker of the mu-opioid receptor gene-would serve as an indirect risk factor for food addiction via a heightened hedonic responsiveness to palatable food. Results confirmed these relationships. In addition, our findings that the food-addiction group had significantly higher levels of hedonic responsiveness to food suggests that this bio-behavioral trait may foster a proneness to overeating, to episodes of binge eating, and ultimately to a compulsive and addictive pattern of food intake.
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Affiliation(s)
- Caroline Davis
- School of Kinesiology & Health Sciences, 343 Bethune College, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada.
| | - Natalie J Loxton
- School of Applied Psychology, Griffith University, 176 Messines Ridge Road Mt Gravatt, Queensland 4122, Australia.
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BLUM KENNETH, FEBO MARCELO, MCLAUGHLIN THOMAS, CRONJÉ FRANSJ, HAN DAVID, GOLD SMARK. Hatching the behavioral addiction egg: Reward Deficiency Solution System (RDSS)™ as a function of dopaminergic neurogenetics and brain functional connectivity linking all addictions under a common rubric. J Behav Addict 2014; 3:149-56. [PMID: 25317338 PMCID: PMC4189308 DOI: 10.1556/jba.3.2014.019] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 07/04/2014] [Accepted: 07/04/2014] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND Following the first association between the dopamine D2 receptor gene polymorphism and severe alcoholism, there has been an explosion of research reports in the psychiatric and behavioral addiction literature and neurogenetics. With this increased knowledge, the field has been rife with controversy. Moreover, with the advent of Whole Genome-Wide Studies (GWAS) and Whole Exome Sequencing (WES), along with Functional Genome Convergence, the multiple-candidate gene approach still has merit and is considered by many as the most prudent approach. However, it is the combination of these two approaches that will ultimately define real, genetic allelic relationships, in terms of both risk and etiology. Since 1996, our laboratory has coined the umbrella term Reward Deficiency Syndrome (RDS) to explain the common neurochemical and genetic mechanisms involved with both substance and non-substance, addictive behaviors. METHODS This is a selective review of peer-reviewed papers primary listed in Pubmed and Medline. RESULTS A review of the available evidence indicates the importance of dopaminergic pathways and resting-state, functional connectivity of brain reward circuits. DISCUSSION Importantly, the proposal is that the real phenotype is RDS and impairments in the brain's reward cascade, either genetically or environmentally (epigenetically) induced, influence both substance and non-substance, addictive behaviors. Understanding shared common mechanisms will ultimately lead to better diagnosis, treatment and prevention of relapse. While, at this juncture, we cannot as yet state that we have "hatched the behavioral addiction egg", we are beginning to ask the correct questions and through an intense global effort will hopefully find a way of "redeeming joy" and permitting homo sapiens live a life, free of addiction and pain.
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Affiliation(s)
- KENNETH BLUM
- Department of Psychiatry and McKnight Brain Institute, University of Florida, College of Medicine, Gainesville, FL, USA,Department of Clinical Medicine, Malibu Beach Recovery Center, Malibu Beach, CA, USA,Department of Personalized Medicine, IGENE, LLC, Austin, TX, USA,Corresponding author: Kenneth Blum, PhD; Department of Psychiatry and McKnight Brain Institute, University of Florida, College of Medicine, PO Box 103424 Gainesville, Florida, USA, 32610-3424; Phone: +-619-890-2167; Fax: +-352-392-9887; E-mail:
| | - MARCELO FEBO
- Department of Psychiatry and McKnight Brain Institute, University of Florida, College of Medicine, Gainesville, FL, USA
| | | | | | - DAVID HAN
- Department of Management Science and Statistics, University of Texas at San Antonio, Texas, USA
| | - S. MARK GOLD
- Department of Psychiatry and McKnight Brain Institute, University of Florida, College of Medicine, Gainesville, FL, USA,Department of Clinical Medicine, Malibu Beach Recovery Center, Malibu Beach, CA, USA
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Blum K, Oscar-Berman M, Blum SH, Madigan MA, Waite RL, McLaughlin T, Barh D. Can Genetic Testing Coupled with Enhanced Dopaminergic Activation Reduce Recidivism Rates in the Workers Compensation Legacy Cases? ACTA ACUST UNITED AC 2014; 2. [PMID: 27512720 PMCID: PMC4976629 DOI: 10.4172/2329-6488.1000161] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Kenneth Blum
- Department of Psychiatry & McKnight Brain Institute, University of Florida College of Medicine, Gainesville, Fl., USA; Human Integrated Services Unit University of Vermont Center for Clinical & Translational Science, College of Medicine, Burlington, VT, USA; Department of Addiction Research & Therapy, Malibu Beach Recovery Center, Malibu Beach, CA, USA; Dominion Diagnostics, LLC, North Kingstown, RI, USA; Institute of Integrative Omics and Applied Biotechnology, Nonakuri, Purba Medinipur, West Bengal, India; IGENE, LLC, Austin, Texas, USA; Department of Nutrigenomics, RDSolutions, LLC, La Jolla, CA, USA
| | - Marlene Oscar-Berman
- Departments of Psychiatry, Neurology, and Anatomy & Neurobiology, Boston University School of Medicine, and Boston VA Healthcare System, Boston, MA, 02118, USA
| | - Seth H Blum
- Center for Psychiatric Medicine, North Andover, Massachusetts, USA
| | | | | | | | - Debmalya Barh
- Institute of Integrative Omics and Applied Biotechnology, Nonakuri, Purba Medinipur, West Bengal, India
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Lominac KD, McKenna CL, Schwartz LM, Ruiz PN, Wroten MG, Miller BW, Holloway JJ, Travis KO, Rajasekar G, Maliniak D, Thompson AB, Urman LE, Phillips TJ, Szumlinski KK. Mesocorticolimbic monoamine correlates of methamphetamine sensitization and motivation. Front Syst Neurosci 2014; 8:70. [PMID: 24847220 PMCID: PMC4019853 DOI: 10.3389/fnsys.2014.00070] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 04/10/2014] [Indexed: 11/16/2022] Open
Abstract
Methamphetamine (MA) is a highly addictive psychomotor stimulant, with life-time prevalence rates of abuse ranging from 5–10% world-wide. Yet, a paucity of research exists regarding MA addiction vulnerability/resiliency and neurobiological mediators of the transition to addiction that might occur upon repeated low-dose MA exposure, more characteristic of early drug use. As stimulant-elicited neuroplasticity within dopamine neurons innervating the nucleus accumbens (NAC) and prefrontal cortex (PFC) is theorized as central for addiction-related behavioral anomalies, we used a multi-disciplinary research approach in mice to examine the interactions between sub-toxic MA dosing, motivation for MA and mesocorticolimbic monoamines. Biochemical studies of C57BL/6J (B6) mice revealed short- (1 day), as well as longer-term (21 days), changes in extracellular dopamine, DAT and/or D2 receptors during withdrawal from 10, once daily, 2 mg/kg MA injections. Follow-up biochemical studies conducted in mice selectively bred for high vs. low MA drinking (respectively, MAHDR vs. MALDR mice), provided novel support for anomalies in mesocorticolimbic dopamine as a correlate of genetic vulnerability to high MA intake. Finally, neuropharmacological targeting of NAC dopamine in MA-treated B6 mice demonstrated a bi-directional regulation of MA-induced place-conditioning. These results extend extant literature for MA neurotoxicity by demonstrating that even subchronic exposure to relatively low MA doses are sufficient to elicit relatively long-lasting changes in mesocorticolimbic dopamine and that drug-induced or idiopathic anomalies in mesocorticolimbic dopamine may underpin vulnerability/resiliency to MA addiction.
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Affiliation(s)
- Kevin D Lominac
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - Courtney L McKenna
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - Lisa M Schwartz
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - Paige N Ruiz
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - Melissa G Wroten
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - Bailey W Miller
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - John J Holloway
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - Katherine O Travis
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - Ganesh Rajasekar
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - Dan Maliniak
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - Andrew B Thompson
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - Lawrence E Urman
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
| | - Tamara J Phillips
- Behavioral Neuroscience, Methamphetamine Abuse Research Center, Veterans Affairs Medical Center, Oregon Health and Science University Portland, OR, USA
| | - Karen K Szumlinski
- Department of Psychological and Brain Sciences, Neuroscience Research Institute, University of California at Santa Barbara Santa Barbara, CA, USA
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Karlsson L, Andersson M, Kronstrand R, Kugelberg FC. Mephedrone, methylone and 3,4-methylenedioxypyrovalerone (MDPV) induce conditioned place preference in mice. Basic Clin Pharmacol Toxicol 2014; 115:411-6. [PMID: 24739011 DOI: 10.1111/bcpt.12253] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 04/08/2014] [Indexed: 11/29/2022]
Abstract
During the last decade, there has been a worldwide increase in popularity and abuse of synthetic cathinones. Common ingredients of the so-called bath salts include mephedrone, methylone and 3,4-methylenedioxypyrovalerone (MDPV). Relatively little information about the pharmacology and addiction potential of these drugs is available. We used the conditioned place preference (CPP) paradigm to explore the reinforcing effects of three different synthetic cathinones. The primary aim of this study was to investigate whether mephedrone, methylone and MDPV induce CPP in mice. The secondary aims were to investigate a possible dose-response CPP and whether the synthetic cathinones induce higher CPP than amphetamine at equal dose. C57BL/6 mice were conditioned to mephedrone, methylone, MDPV and amphetamine at doses of 0.5, 2, 5, 10 or 20 mg/kg (i.p.). During the conditioning, the mice received two training sessions per day for 4 days. All four tested drugs showed a significant place preference compared with controls. Mice conditioned with MDPV (5 and 10 mg/kg) displayed a greater preference score compared to mice conditioned with amphetamine (5 and 10 mg/kg). Our findings show that mephedrone, methylone and MDPV produce CPP equal or higher than amphetamine strongly suggesting addictive properties. Given the public health concern of abuse, future pharmacological studies are necessary to fully understand the effects of these drugs.
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Affiliation(s)
- Louise Karlsson
- Division of Drug Research, Clinical Pharmacology, Department of Medical and Health Sciences, Linköping University, Linköping, Sweden
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Blum K, Schoenthaler SJ, Oscar-Berman M, Giordano J, Madigan MA, Braverman ER, Han D. Drug abuse relapse rates linked to level of education: can we repair hypodopaminergic-induced cognitive decline with nutrient therapy? PHYSICIAN SPORTSMED 2014; 42:130-45. [PMID: 24875980 DOI: 10.3810/psm.2014.05.2065] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
It is well known that athletes and other individuals who have suffered painful injuries are at increased risk for all reward deficiency syndrome (RDS) behaviors, including substance use disorder (SUD). Comparing patient demographics and relapse rates in chemical dependence programs is pertinent because demographics may affect outcomes. Increased risk for relapse and lower academic achievement were found to have a significant association in recent outcome data from a holistic treatment center (HTC) located in North Miami Beach, FL. Relapse outcomes from the Drug Addiction Treatment Outcome Study (DATOS; n = 1738) and HTC (n = 224) were compared for a 12-month period. Post-discharge relapse was reported by 26% of HTC patients and 58% of patients in DATOS. When broken out by education level-less than high school, high school diploma, college degree, and graduate degree-HTC patient relapse was 50%, 36%, 33%, and 16%, respectively, and demonstrated an inverse linear association (F = 5.702; P = 0.017). Looking at DATOS patient relapse rates broken down by educational grades/years completed, patients who attended school between 7th grade and 4 years of college also demonstrated an inverse linear association (F = 5.563; P = 0.018). Additionally, the lowest performers, patients who reported their academic performance as "not so good," had the highest relapse (F = 4.226; P = 0.04). Albeit certain limitations, compared with DATOS patients, HTC patients produced significantly larger net differences in relapse rates (X 2 = 84.09; P = 0.0001), suggesting that other variables, such as the treatment model may also affect patient relapse. Our results implicate the use of vitamin and mineral supplements coupled with a well-researched natural dopamine agonist nutrient therapy; both have been shown to improve cognition and behavior, and thus academic achievement. That relapse is highest among addicts who have less education and who report lower grades is a factor that can be useful when considering treatment type and controlled for when comparing treatment outcomes.
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Affiliation(s)
- Kenneth Blum
- Department of Psychiatry and McKnight Brain Institute, University of Florida College of Medicine, Gainesville, FL.
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Gerra G, Somaini L, Leonardi C, Cortese E, Maremmani I, Manfredini M, Donnini C. Association between gene variants and response to buprenorphine maintenance treatment. Psychiatry Res 2014; 215:202-7. [PMID: 24274990 DOI: 10.1016/j.psychres.2013.11.001] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Revised: 09/13/2013] [Accepted: 11/03/2013] [Indexed: 11/24/2022]
Abstract
A variety of studies were addressed to differentiate responders and non-responders to substitution treatment among heroin dependent patients, without conclusive findings. In particular, preliminary pharmacogenetic findings have been reported to predict treatment effectiveness in mental health and substance use disorders. Aim of the present study was to investigate the possible association of buprenorphine (BUP) treatment outcome with gene variants that may affect kappa-opioid receptors and dopamine system function. One hundred and seven heroin addicts (West European, Caucasians) who underwent buprenorphine maintenance treatment were genotyped and classified into two groups (A and B) on the basis of treatment outcome. Non-responders to buprenorphine (group B) have been identified taking into account early drop out, continuous use of heroin, severe behavioral or psychiatric problems, misbehavior and diversion during the 6 months treatment period. No difference was evidenced between responders and non-responders to BUP in the frequency of kappa opioid receptor (OPRK1) 36G>T SNP. The frequency of dopamine transporter (DAT) gene polymorphism (SLC6A3/DAT1), allele 10, was evidently much higher in "non-responder" than in "responder" individuals (64.9% vs. 55.93%) whereas the frequency of the category of other alleles (6, 7 and 11) was higher in responder than in non-responder individuals (11.02% vs. 2.13% respectively). On one hand, the hypothesis that possible gene-related changes in kappa-opioid receptor could consistently affect buprenorphine pharmacological action and clinical effectiveness was not confirmed in our study, at least in relation to the single nucleotide polymorphism 36G>T. On the other hand, the possibility that gene-related dopamine changes could have reduced BUP effectiveness and impaired maintenance treatment outcome was cautiously supported by our findings. DAT1 gene variants such as allele 10, previously reported in association with personality and behavioral problems, would have influenced the effects of BUP-induced dopamine release, modulated through mu and kappa opioid receptors, and probably the related reinforcing capacity of the drug.
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Affiliation(s)
- Gilberto Gerra
- Drug Prevention and Health Branch, Division for Operations, United Nation Office on Drugs and Crime, Vienna, Austria
| | - Lorenzo Somaini
- Addiction Treatment Center, Local Health Service, Cossato 13836, Biella, Italy.
| | - Claudio Leonardi
- Addiction Treatment Center, Local Health Service, Rome C 00179, Rome, Italy
| | - Elena Cortese
- Addiction Treatment Center, Local Health Service, Rome C 00179, Rome, Italy
| | - Icro Maremmani
- Department of Neurosciences, Santa Chiara University Hospital, University of Pisa, 56100 Pisa, Italy
| | - Matteo Manfredini
- Department of Life Sciences, University of Parma, Parma 43124, Italy
| | - Claudia Donnini
- Department of Life Sciences, University of Parma, Parma 43124, Italy
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Gao H, Shang YZ, Xia T, Qiao MQ, Zhang HY, Ma YX. The correlation between neurosteroids and neurotransmitters with liver yang rising and liver qi stagnation types of premenstrual syndrome. Gynecol Endocrinol 2014; 30:913-7. [PMID: 25211539 DOI: 10.3109/09513590.2014.943726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND To investigate neural-reproductive hormonal basis of liver yang rising (LYR), liver qi stagnation (LQS) premenstrual syndrome (PMS), and to develop standardized diagnostic criteria for PMS. METHODS HPLC, HPLC-MC, ELISA and radioimmunoassay were used to compare levels of serum hormones, plasma neurotransmitters and neurosteroids between LYR PMS patients, LQS PMS patients and healthy controls (30 subjects in each group). RESULTS Of the measures, all three groups exhibited no significant differences during the follicular phase. In contrast, during the luteal phase, LYR PMS testosterone levels tended to be higher than controls, while dopamine and 5-HT of the LYR PMS group were significantly higher. Conversely, γ-aminobutyric acid in the LYR PMS group was significantly lower than controls (p < 0.05). On the other hand, epinephrine and norepinephrine levels in both PMS groups were significantly higher than controls (p < 0.05), while pregnenolone and allopregnanolone of LYR and LQS groups were significantly lower than controls, with dehydroepiandrosterone (DHEA) being significantly higher than controls (p < 0.05). The ratios of DHEA/allopregnanolone and DHEA/pregnenolone of both PMS groups were significantly higher than the control group, with the LYR PMS group ratios being significantly higher than in the LQS PMS group (p < 0.05). CONCLUSION The decrease in pregnenolone and allopregnenolone, increase in DHEA, DHEA/allopregnanolone and DHEA/pregnenolone during the luteal phase may be one of the biological bases for anger in LYR PMS patients and depression in LQS PMS patients.
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Affiliation(s)
- Hui Gao
- a Department of Traditional Chinese Medicine, Affiliated Hospital of Chengde Medical College Chengde Hebei
| | - Ya Zhen Shang
- b Institute of Traditional Chinese Medicine, Chengde Medical College Chengde Hebei
| | - Tian Xia
- c Department of Traditional Chinese Medicine, First Affiliated Hospital of Tianjin, University of Traditional Chinese Tianjin
| | - Ming Qi Qiao
- d Basic Medical School, Shandong University of Traditional Chinese Medicine Jinan Shandong
| | - Hui Yun Zhang
- d Basic Medical School, Shandong University of Traditional Chinese Medicine Jinan Shandong
| | - Yue Xiang Ma
- d Basic Medical School, Shandong University of Traditional Chinese Medicine Jinan Shandong
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Eisenstein SA, Antenor-Dorsey JAV, Gredysa DM, Koller JM, Bihun EC, Ranck SA, Arbeláez AM, Klein S, Perlmutter JS, Moerlein SM, Black KJ, Hershey T. A comparison of D2 receptor specific binding in obese and normal-weight individuals using PET with (N-[(11)C]methyl)benperidol. Synapse 2013; 67:748-56. [PMID: 23650017 PMCID: PMC3778147 DOI: 10.1002/syn.21680] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 04/20/2013] [Accepted: 04/27/2013] [Indexed: 01/11/2023]
Abstract
Previous PET imaging studies have demonstrated mixed findings regarding dopamine D2/D3 receptor availability in obese relative to nonobese humans. Nonspecific D2/D3 radioligands do not allow for separate estimation of D2 receptor (D2R) and D3 receptor (D3R) subtypes of the D2 receptor family, which may play different roles in behavior and are distributed differently throughout the brain. These radioligands are also displaceable by endogenous dopamine, confounding interpretation of differences in receptor availability with differing levels of dopamine release. The present study used PET imaging with the D2R-selective radioligand (N-[(11)C] methyl)benperidol ([(11)C]NMB), which is nondisplaceable by endogenous dopamine, to estimate D2R specific binding (BPND) and its relationship to body mass index (BMI) and age in 15 normal-weight (mean BMI = 22.6 kg/m(2)) and 15 obese (mean BMI = 40.3 kg/m(2)) men and women. Subjects with illnesses or taking medications that interfere with dopamine signaling were excluded. Striatal D2R BPND was calculated using the Logan graphical method with cerebellum as a reference region. D2R BPND estimates were higher in putamen and caudate relative to nucleus accumbens, but did not differ between normal-weight and obese groups. BMI values did not correlate with D2R BPND . Age was negatively correlated with putamen D2R BPND in both groups. These results suggest that altered D2R specific binding is not involved in the pathogenesis of obesity per se and underscore the need for additional studies evaluating the relationship between D3R, dopamine reuptake, or endogenous dopamine release and human obesity.
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Affiliation(s)
- Sarah A. Eisenstein
- Department of Psychiatry, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
| | - Jo Ann V. Antenor-Dorsey
- Department of Psychiatry, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
| | - Danuta M. Gredysa
- Department of Psychiatry, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
| | - Jonathan M. Koller
- Department of Psychiatry, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
| | - Emily C. Bihun
- Department of Psychiatry, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
| | - Samantha A. Ranck
- Department of Psychiatry, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
| | - Ana Maria Arbeláez
- Department of Pediatrics, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
| | - Samuel Klein
- Department of Internal Medicine, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
| | - Joel S. Perlmutter
- Department of Neurology, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
- Department of Radiology, Washington University School of Medicine in St. Louis, Mallinckrodt Institute of Radiology, 660 S. Euclid Ave., St. Louis, MO 63110
- Department of Anatomy and Neurobiology, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
- Program in Physical Therapy, Washington University School of Medicine in St. Louis, 4444 Forest Park Blvd., St. Louis, MO 63108
- Program in Occupational Therapy, Washington University School of Medicine in St. Louis, 4444 Forest Park Blvd., St. Louis, MO 63108
| | - Stephen M. Moerlein
- Department of Radiology, Washington University School of Medicine in St. Louis, Mallinckrodt Institute of Radiology, 660 S. Euclid Ave., St. Louis, MO 63110
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
| | - Kevin J. Black
- Department of Psychiatry, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
- Department of Neurology, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
- Department of Radiology, Washington University School of Medicine in St. Louis, Mallinckrodt Institute of Radiology, 660 S. Euclid Ave., St. Louis, MO 63110
- Department of Anatomy and Neurobiology, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
| | - Tamara Hershey
- Department of Psychiatry, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
- Department of Neurology, Washington University School of Medicine in St. Louis, 660 S. Euclid Ave., St. Louis, MO 63110
- Department of Radiology, Washington University School of Medicine in St. Louis, Mallinckrodt Institute of Radiology, 660 S. Euclid Ave., St. Louis, MO 63110
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