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Bayoglu M, Ozturk Bintepe M, Kanit L, Balkan B, Gozen O, Koylu EO, Keser A. Decreased anxiety-like behavior in a selectively bred high nicotine-preferring rat line. Int J Neurosci 2023:1-11. [PMID: 37929683 DOI: 10.1080/00207454.2023.2279505] [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: 07/08/2023] [Accepted: 10/31/2023] [Indexed: 11/07/2023]
Abstract
Genetic vulnerability contributes significantly to the individual variability observed in nicotine dependence. Selective breeding for sensitivity to a particular effect of abused drugs has produced rodent lines useful for studying genetic vulnerability to drug addiction. Previous research showed that anxiety-related personality traits are associated with nicotine dependence. Therefore, we examined the differences in anxiety-like behavior between a high nicotine-preferring rat line and their controls. At the beginning of the study, all rats, naïve to any drug, were exposed sequentially to open field arena, marble-burying and elevated plus-maze paradigms. In the second step, all rats received nicotine in drinking water for 7 weeks. Behavioral tests were rerun on the final 2 weeks of chronic nicotine treatment. Elevated plus-maze testings under basal condition and during chronic nicotine treatment showed that the time spent on the open arms, preference for being in the open arms, and the latency to enter the closed arms were higher, whereas open arm avoidance index was lower in nicotine-preferring rats compared to the controls. In the open field test, nicotine-preferring rats spent longer time in the central zone and excreted less fecal pellets; they buried less marbles in the marble-burying test. These findings indicate a lower level of anxiety-like behavior in nicotine-preferring rat line under basal conditions and during chronic nicotine treatment. We conclude that lower anxiety level in nicotine-preferring rat line is consistent with novelty-seeking personality type and may increase vulnerability to nicotine dependence in this rat line.
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Affiliation(s)
- Merve Bayoglu
- Neuroscience Department, Ege University, Institute of Health Sciences, Izmir, Turkey
| | | | - Lutfiye Kanit
- Neuroscience Department, Ege University, Institute of Health Sciences, Izmir, Turkey
- Faculty of Medicine, Physiology Department, Ege University, Izmir, Turkey
- Center for Brain Research, Ege University, Izmir, Turkey
| | - Burcu Balkan
- Neuroscience Department, Ege University, Institute of Health Sciences, Izmir, Turkey
- Faculty of Medicine, Physiology Department, Ege University, Izmir, Turkey
- Center for Brain Research, Ege University, Izmir, Turkey
| | - Oguz Gozen
- Neuroscience Department, Ege University, Institute of Health Sciences, Izmir, Turkey
- Faculty of Medicine, Physiology Department, Ege University, Izmir, Turkey
- Center for Brain Research, Ege University, Izmir, Turkey
| | - Ersin O Koylu
- Neuroscience Department, Ege University, Institute of Health Sciences, Izmir, Turkey
- Faculty of Medicine, Physiology Department, Ege University, Izmir, Turkey
- Center for Brain Research, Ege University, Izmir, Turkey
| | - Aysegul Keser
- Neuroscience Department, Ege University, Institute of Health Sciences, Izmir, Turkey
- Faculty of Medicine, Physiology Department, Ege University, Izmir, Turkey
- Center for Brain Research, Ege University, Izmir, Turkey
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2
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Shivakumar AB, Kumari S, Mehak SF, Gangadharan G. Compulsive-like Behaviors in Amyloid-β 1-42-Induced Alzheimer's Disease in Mice Are Associated With Hippocampo-cortical Neural Circuit Dysfunction. BIOLOGICAL PSYCHIATRY GLOBAL OPEN SCIENCE 2023; 3:773-784. [PMID: 37881551 PMCID: PMC10593884 DOI: 10.1016/j.bpsgos.2023.02.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 02/21/2023] [Accepted: 02/21/2023] [Indexed: 03/08/2023] Open
Abstract
Background In addition to memory deficits, patients with Alzheimer's disease (AD) experience neuropsychiatric disturbances. Recent studies have suggested the association of obsessive-compulsive disorder with the early stages of AD. However, there is a lack of understanding of the neurobiological underpinnings of compulsive-like behaviors at the neuronal circuit level and their relationship with AD. Methods We have addressed this issue in an amyloid-β 1-42-induced mouse model of AD by studying compulsive-like behaviors. Next, we compared the hippocampal and medial prefrontal cortex (mPFC) local field potential pattern and coherence between these regions of control and AD mice. We also assessed the expression pattern of acetylcholine and glutamatergic signaling in these regions, using quantitative polymerase chain reaction. Results Our findings show that AD mice exhibit compulsive-like behaviors, as evidenced by enhanced marble burying, nest building, and burrowing. Furthermore, AD mice exhibited hippocampo-cortical circuit dysfunction demonstrated by decreased power of rhythmic oscillations at the theta (4-12 Hz) and gamma (25-50 Hz) frequencies in the hippocampus and mPFC, two functionally interconnected brain regions involved both in AD and compulsive behaviors. Importantly, coherence between the hippocampus and mPFC in the theta band of AD animals was significantly reduced. Furthermore, we found reduced cholinergic and glutamatergic neurotransmission in the hippocampus and mPFC of AD mice. Conclusions We conclude that the hippocampo-cortical functional alterations may play a significant role in mediating the compulsive-like behaviors observed in AD mice. These findings may help in understanding the underlying circuit mechanisms of obsessive-compulsive disorder-like phenotypes associated with AD.
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Affiliation(s)
- Apoorva Bettagere Shivakumar
- Department of Cell and Molecular Biology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Sparsha Kumari
- Department of Cell and Molecular Biology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Sonam Fathima Mehak
- Department of Cell and Molecular Biology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Gireesh Gangadharan
- Department of Cell and Molecular Biology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
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Wu R, Liu J, Johnson B, Huang Y, Zhang Y, Li JX. Activation of trace amine-associated receptor 1 attenuates nicotine withdrawal-related effects. Addict Biol 2022; 27:e13075. [PMID: 34170054 PMCID: PMC8709869 DOI: 10.1111/adb.13075] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 06/10/2021] [Accepted: 06/16/2021] [Indexed: 01/03/2023]
Abstract
Nicotine addiction is a leading avoidable brain disorder globally. Although nicotine induces a modest reinforcing effect, which is important for the initial drug use, the transition from nicotine use to nicotine addiction involves the mechanisms responsible for the negative consequences of drug abstinence. Recent study suggested that trace amine-associated receptor 1 (TAAR1) is a promising pharmacological target for the modulation of positive reinforcing effects of nicotine. However, whether TAAR1 plays a part in the negative reinforcement of nicotine withdrawal remains to be determined. Here, using a long-access (LA) self-administration model, we investigated whether LA rats show increased nicotine intake and withdrawal symptoms in comparison with saline and ShA rats and then tested the effect of TAAR1 partial agonist RO5263397 on nicotine withdrawal effects. We found that rats from long-access group showed significant abstinence-induced anxiety-like behaviour, mechanic hypersensitivity, increased number of precipitated withdrawal signs and higher motivation for the drug, while rats from short-access did not differ from saline group. TAAR1 partial agonist RO5263397 significantly reduced the physical and motivational withdrawal effects of nicotine in LA rats, as reflected by increased time spent on the open arm in the elevated plus maze (EPM) test, normalized paw withdrawal threshold, decreased withdrawal signs and motivation to self-administer nicotine. This study indicates that activation of TAAR1 attenuates the negative-reinforcing effects of nicotine withdrawal and further suggests TAAR1 as a promising target to treat nicotine addiction.
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Affiliation(s)
- Ruyan Wu
- Department of Pharmacology and Toxicology, University at Buffalo, Buffalo, New York, USA
- School of Medicine, Yangzhou University, Yangzhou, China
| | - Jianfeng Liu
- Department of Pharmacology and Toxicology, University at Buffalo, Buffalo, New York, USA
| | - Bernard Johnson
- Department of Pharmacology and Toxicology, University at Buffalo, Buffalo, New York, USA
| | - Yufei Huang
- Department of Pharmacology and Toxicology, University at Buffalo, Buffalo, New York, USA
| | - Yanan Zhang
- Research Triangle Institute, Research Triangle Park, North Carolina, USA
| | - Jun-Xu Li
- Department of Pharmacology and Toxicology, University at Buffalo, Buffalo, New York, USA
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4
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Baumbach JL, McCormick CM. Nicotine sensitization (Part 2): Time spent in the centre of an open field sensitizes to repeated nicotine into the drug-free state in female rats. Psychopharmacology (Berl) 2021; 238:371-382. [PMID: 33123818 DOI: 10.1007/s00213-020-05686-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 10/19/2020] [Indexed: 01/08/2023]
Abstract
RATIONALE Nicotine is initially anxiogenic and becomes anxiolytic after prolonged exposure. The mechanisms that facilitate the shift in anxiety-like behaviour produced by nicotine are unclear. OBJECTIVE We investigated the change in time spent in the centre of an open field (as a measure anxiety-like behaviour) produced by three intermittent injections of nicotine as part of experiments of locomotor sensitization to nicotine. METHODS Rats were injected with nicotine (0.4 mg/kg) or saline and immediately placed in the open field arena for 1 h on two consecutive days and again 9 days later. RESULTS When given saline, time spent in the centre of the arena did not change, whereas repeated nicotine injections increased in time spent in the centre beyond the increase produced by an acute injection of nicotine. Repeated nicotine (and not acute nicotine) also increased time in the centre in a drug-free state when tested 24 h after the last injection. CONCLUSION Repeated nicotine sensitized the time spent in the centre of an open field with the long-lasting sensitization of this measure of anxiety-like behaviour evident in a drug-free state, in contrast to locomotor sensitization which does not persist in the drug-free state. The results suggest independence of the mechanisms of sensitization that underlie locomotor and anxiolytic effects.
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Affiliation(s)
| | - Cheryl M McCormick
- Department of Psychology, Department of Biological Sciences, Centre for Neuroscience, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario, L2S 3A1, Canada.
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5
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Mahmood HM, Aldhalaan HM, Alshammari TK, Alqasem MA, Alshammari MA, Albekairi NA, AlSharari SD. The Role of Nicotinic Receptors in the Attenuation of Autism-Related Behaviors in a Murine BTBR T + tf/J Autistic Model. Autism Res 2020; 13:1311-1334. [PMID: 32691528 DOI: 10.1002/aur.2342] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 04/28/2020] [Accepted: 05/31/2020] [Indexed: 12/15/2022]
Abstract
Nicotinic receptors are distributed throughout the central and peripheral nervous system. Postmortem studies have reported that some nicotinic receptor subtypes are altered in the brains of autistic people. Recent studies have demonstrated the importance of nicotinic acetylcholine receptors (nAChRs) in the autistic behavior of BTBR T + tf/J mouse model of autism. This study was undertaken to examine the behavioral effects of targeted nAChRs using pharmacological ligands, including nicotine and mecamylamine in BTBR T + tf/J and C57BL/6J mice in a panel of behavioral tests relating to autism. These behavioral tests included the three-chamber social interaction, self-grooming, marble burying, locomotor activity, and rotarod test. We examined the effect of various oral doses of nicotine (50, 100, and 400 mcg/mL; po) over a period of 2 weeks in BTBR T + tf/J mouse model. The results indicated that the chronic administration of nicotine modulated sociability and repetitive behavior in BTBR T + tf/J mice while no effects observed in C57BL/6J mice. Furthermore, the nonselective nAChR antagonist, mecamylamine, reversed nicotine effects on sociability and increased repetitive behaviors in BTBR T + tf/J mice. Overall, the findings indicate that the pharmacological modulation of nicotinic receptors is involved in modulating core behavioral phenotypes in the BTBR T + tf/J mouse model. LAY SUMMARY: The involvement of brain nicotinic neurotransmission system plays a crucial role in regulating autism-related behavioral features. In addition, the brain of the autistic-like mouse model has a low acetylcholine level. Here, we report that nicotine, at certain doses, improved sociability and reduced repetitive behaviors in a mouse model of autism, implicating the potential therapeutic values of a pharmacological intervention targeting nicotinic receptors for autism therapy. Autism Res 2020, 13: 1311-1334. © 2020 International Society for Autism Research, Wiley Periodicals, Inc.
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Affiliation(s)
- Hafiz M Mahmood
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Hesham M Aldhalaan
- Department of Neuroscience, Center for Autism Research, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Tahani K Alshammari
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Mashael A Alqasem
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Musaad A Alshammari
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Norah A Albekairi
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Shakir D AlSharari
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia.,Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, Virginia, USA
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Gießing C, Ahrens S, Thiel CM. Healthy Subjects With Extreme Patterns of Performance Differ in Functional Network Topology and Benefits From Nicotine. Front Syst Neurosci 2020; 13:83. [PMID: 31998085 PMCID: PMC6965056 DOI: 10.3389/fnsys.2019.00083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 12/16/2019] [Indexed: 11/13/2022] Open
Abstract
Do subjects with atypical patterns in attentional and executive behaviour show different brain network topology and react differently towards nicotine administration? The efficacy of pro-cognitive drugs like nicotine considerably varies between subjects and previous theoretical and empirical evidence suggest stronger behavioural nicotine effects in subjects with low performance. One problem is, however, how to best define low performance, especially if several cognitive functions are assessed for subject characterisation. We here present a method that used a multivariate, robust outlier detection algorithm to identify subjects with suspicious patterns of performance in attentional and executive functioning. In contrast to univariate approaches, this method is sensitive towards extreme positions within the multidimensional space that do not have to be extreme values in the individual behavioural distributions. The method was applied to a dataset of healthy, non-smoking subjects (n = 34) who were behaviorally characterised by an attention and executive function test on which N = 12 volunteers were classified as outliers. All subjects then underwent a resting-state functional magnetic resonance imaging (fMRI) scan to characterise brain network topology and an experimental behavioural paradigm under placebo and nicotine (7 mg patch) that gauged aspects of attention and executive function. Our results indicate that subjects with an atypical multivariate pattern in attention and executive functioning showed significant differences in nodal brain network integration in visual association and pre-motor brain regions during resting state. These differences in brain network topology significantly predicted larger individual nicotine effects on attentional processing. In summary, the current approach successfully identified a subgroup of healthy volunteers with low behavioural performance who differ in brain network topology and attentional benefit from nicotine.
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Affiliation(s)
- Carsten Gießing
- Biological Psychology, Department of Psychology, School of Medicine and Health Sciences, Carl-von-Ossietzky Universität Oldenburg, Oldenburg, Germany
- Research Center Neurosensory Science, Carl-von-Ossietzky Universität Oldenburg, Oldenburg, Germany
| | - Stefan Ahrens
- Biological Psychology, Department of Psychology, School of Medicine and Health Sciences, Carl-von-Ossietzky Universität Oldenburg, Oldenburg, Germany
| | - Christiane M. Thiel
- Biological Psychology, Department of Psychology, School of Medicine and Health Sciences, Carl-von-Ossietzky Universität Oldenburg, Oldenburg, Germany
- Research Center Neurosensory Science, Carl-von-Ossietzky Universität Oldenburg, Oldenburg, Germany
- Cluster of Excellence “Hearing4all”, Carl-von-Ossietzky Universität Oldenburg, Oldenburg, Germany
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Rodríguez-Ortega E, de la Fuente L, de Amo E, Cubero I. Environmental Enrichment During Adolescence Acts as a Protective and Therapeutic Tool for Ethanol Binge-Drinking, Anxiety-Like, Novelty Seeking and Compulsive-Like Behaviors in C57BL/6J Mice During Adulthood. Front Behav Neurosci 2018; 12:177. [PMID: 30177875 PMCID: PMC6110170 DOI: 10.3389/fnbeh.2018.00177] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 07/30/2018] [Indexed: 12/21/2022] Open
Abstract
Repetitive drug/ethanol (EtOH) binge-like consumption during pre-addictive stages favors a transition to addiction in vulnerable organisms. Experimental evidence points to the therapeutic and preventive effects of environmental enrichment (EE) on drug and EtOH addiction; however, little is known regarding EE modulation of binge-like consumption in non-dependent organisms. Here, we explore the impact of early EE on binge-like EtOH consumption: (1) we test whether early EE exposure prevents binge-like EtOH intake (20% v/v) in adult mice under an intermittent drinking in the dark (iDID) schedule; (2) we evaluate the therapeutic effects of EE housing conditions on binge-like EtOH consumption in adult animals; and (3) we compare novelty-seeking and compulsive-like behaviors, and anxiety-like behavior, as measured by the Hole Board (HB) and Elevated Plus Maze (EPM) tests, respectively, in adult EE/standard environment (SE) animals. Adolescent (postnatal day 28; PND28) mice were randomly allocated to two housing conditions (4 animals/cage): EE or SE. At PND67 all the animals were exposed to a schedule of EtOH binge-like iDID. On PND92 half of the animals in each environmental condition (EE and SE) were randomly allocated to two subgroups in a crossover design, where environmental conditions were kept similar to those previously experienced or switched, finally leading to four experimental conditions: EE-EE, EE-SE, SE-SE, and SE-EE. EtOH binge-like consumption continued until PND140, when EPM and HB tests were finally conducted. The main observations were: (1) EE-reared mice showed lower EtOH binge-like intake than SE-reared mice during adulthood, which supports a protective role for EE. (2) when adult EtOH drinking SE-reared mice were switched to EE conditions, a reduction in EtOH binge-like consumption was observed, suggesting a therapeutic role for EE; however, losing EE during adulthood triggered a progressive increase in EtOH binge-like intake. Moreover, (3) EE-housed adult animals with long-term exposure to EtOH binge-drinking showed lower anxiety-like, compulsive-like, and novelty-seeking behaviors than SE-housed mice, irrespective of the specific housing conditions during adolescence. We discuss the primary impact of EE on anxiety-like neurobehavioral brain systems through which it secondarily modulates EtOH binge-like drinking.
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Affiliation(s)
| | | | - Enedina de Amo
- Departmento de Psicología, Universidad de Almería, Almería, Spain
| | - Inmaculada Cubero
- Departmento de Psicología, Universidad de Almería, Almería, Spain.,CERNEP, Universidad de Almería, Almería, Spain
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Pogun S, Yararbas G, Nesil T, Kanit L. Sex differences in nicotine preference. J Neurosci Res 2017; 95:148-162. [PMID: 27870459 DOI: 10.1002/jnr.23858] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 06/29/2016] [Accepted: 07/11/2016] [Indexed: 01/01/2023]
Abstract
Smoking is the major cause of preventable deaths worldwide, and although there is a decline in overall smoking prevalence in developed countries, the decline in women is less pronounced than in men. Women become dependent faster and experience greater difficulties in quitting. Similar trends have been observed in animal models of nicotine/tobacco addiction. Individual differences in vulnerability to drug abuse are also observed in nicotine/tobacco addiction and point to the importance of sex differences. This Review, summarizes findings from three experimental approaches used to depict nicotine preference in animal models, intravenous and oral nicotine self-administration and nicotine-induced conditioned place preference. Nicotine preference is considered to be reflected in the animal's motivation to administer the drug (intravenously or orally) or to prefer an environment paired with the presence of the drug (conditioned place preference). These approaches all point to the importance of sex and age of the subjects; the preference of females and adolescents appear to be more pronounced than that of males and adults, respectively. A closer look at these factors will help us understand the mechanisms that underlie nicotine addiction and develop strategies to cope. Ignoring sex differences and reaching conclusions based only on studies using male subjects has resulted in erroneous generalizations in the past. Sex differences in nicotine preference have been clearly documented, and awareness on this aspect of nicotine dependence will significantly impact our success in translational research. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Sakire Pogun
- Center for Brain Research, Ege University, Izmir, Turkey
| | - Gorkem Yararbas
- Institute on Drug Abuse, Toxicology and Pharmaceutical Science, Ege University, Izmir, Turkey
| | - Tanseli Nesil
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, Virginia
| | - Lutfiye Kanit
- Center for Brain Research, Ege University, Izmir, Turkey.,Physiology Department, School of Medicine, Ege University, Izmir, Turkey
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Abreu-Villaça Y, Manhães AC, Krahe TE, Filgueiras CC, Ribeiro-Carvalho A. Tobacco and alcohol use during adolescence: Interactive mechanisms in animal models. Biochem Pharmacol 2017; 144:1-17. [DOI: 10.1016/j.bcp.2017.06.113] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 06/05/2017] [Indexed: 12/13/2022]
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10
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Yang Z, Nesil T, Wingo T, Chang SL, Li MD. HIV-1 Proteins Influence Novelty-Seeking Behavior and Alter Region-Specific Transcriptional Responses to Chronic Nicotine Treatment in HIV-1Tg Rats. Nicotine Tob Res 2017; 19:1024-1032. [PMID: 28339662 PMCID: PMC5896433 DOI: 10.1093/ntr/ntx047] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 02/15/2017] [Indexed: 12/13/2022]
Abstract
INTRODUCTION Clinical studies suggest that HIV-1-infected patients are more likely to use or abuse addictive drugs than is the general population. We hypothesized that HIV-1 proteins impact novelty-seeking behavior and enhance the transcriptional response to nicotine in genes implicated in both novelty-seeking behavior and drug addiction. METHODS We assessed the effects of HIV-1 proteins on novelty-seeking behavior by comparing baseline activity differences of HIV-1Tg and F344 control rats in the open-field test. One day after behavioral testing, all rats began daily subcutaneous injections of either nicotine (0.4 mg/kg, base) or saline (the same for each rat) for 27 days. At the end of treatment, the prefrontal cortex, nucleus accumbens, and ventral tegmental area were collected for RNA expression analysis of genes in the receptor families for dopamine, GABA, glutamate, and serotonin. RESULTS Significant strain difference was detected in the distance moved in the center, such that HIV-1Tg rats traveled greater distance in the center of the arena than did F344 rats. Quantitative RT-PCR analysis showed that mRNA from Drd3 and Grm2 in the prefrontal cortex and Drd5 and Gabra6 in the ventral tegmental area was significantly upregulated, whereas that of Drd5 in the nucleus accumbens was downregulated in HIV-1Tg rats compared with F344 rats. Further, more addiction-related genes were significantly modulated by nicotine in each brain region in the HIV-1Tg rats than in the control animals. CONCLUSIONS HIV-1 proteins may affect novelty-seeking behavior and modulate the expression of genes related to drug addiction and novelty-seeking behavior. IMPLICATIONS HIV-1 viral proteins and chronic nicotine treatment impact the expression of genes involved in novelty-seeking behavior and addiction in three brain regions of the HIV-1 transgenic rat. These findings implicate that HIV-1 proteins may be involved in novelty-seeking behavior and in modulating the expression of genes related to drug addiction and novelty seeking.
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Affiliation(s)
- Zhongli Yang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Zhejiang University School of Medicine, Hangzhou, China
- Research Center for Air Pollution and Health, Zhejiang University,Hangzhou,China
- Institute of NeuroImmune Pharmacology, Seton Hall University,South Orange, NJ
| | - Tanseli Nesil
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA
| | - Taylor Wingo
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA
| | - Sulie L Chang
- Institute of NeuroImmune Pharmacology, Seton Hall University,South Orange, NJ
- Department of Biology, Seton Hall University,South Orange, NJ
| | - Ming D Li
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Zhejiang University School of Medicine, Hangzhou, China
- Research Center for Air Pollution and Health, Zhejiang University,Hangzhou,China
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA
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11
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Arenas MC, Aguilar MA, Montagud-Romero S, Mateos-García A, Navarro-Francés CI, Miñarro J, Rodríguez-Arias M. Influence of the Novelty-Seeking Endophenotype on the Rewarding Effects of Psychostimulant Drugs in Animal Models. Curr Neuropharmacol 2016; 14:87-100. [PMID: 26391743 PMCID: PMC4787288 DOI: 10.2174/1570159x13666150921112841] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 08/20/2015] [Accepted: 09/19/2015] [Indexed: 12/16/2022] Open
Abstract
Novelty seeking (NS), defined as a tendency to pursue novel and intense emotional sensations and experiences, is one of the most relevant individual factors predicting drug use among humans. High novelty seeking (HNS) individuals present an increased risk of drug use compared to low novelty seekers. The NS endophenotype may explain some of the differences observed among individuals exposed to drugs of abuse in adolescence. However, there is little research about the particular response of adolescents to drugs of abuse in function of this endophenotype, and the data that do exist are inconclusive. The present work reviews the literature regarding the influence of NS on psychostimulant reward, with particular focus on adolescent subjects. First, the different animal models of NS and the importance of this endophenotype in adolescence are discussed. Later, studies that have used the most common animal models of reward (self-administration, conditioned place preference paradigms) to evaluate how the NS trait influences the rewarding effects of psychostimulants are reviewed. Finally, possible explanations for the enhanced risk of developing substance dependence among HNS individuals are discussed. In conclusion, the studies referred to in this review show that the HNS trait is associated with: (1) increased initial sensitivity to the rewarding effects of psychostimulants, (2) a higher level of drug craving when the subject is exposed to the environmental cues associated with the drug, and (3) enhanced long-term vulnerability to relapse to drug consumption after prolonged abstinence.
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Affiliation(s)
| | | | | | | | | | | | - Marta Rodríguez-Arias
- Unidad de Investigación Psicobiología de las Drogodependencias, Departamento de Psicobiología, Facultad de Psicología, Universitat de València, Avda. Blasco Ibañez, 21, 46010, Valencia, Spain.
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12
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Besson M, Guiducci S, Granon S, Guilloux JP, Guiard B, Repérant C, Faure P, Pons S, Cannazza G, Zoli M, Gardier AM, Maskos U. Alterations in alpha5* nicotinic acetylcholine receptors result in midbrain- and hippocampus-dependent behavioural and neural impairments. Psychopharmacology (Berl) 2016; 233:3297-314. [PMID: 27385416 DOI: 10.1007/s00213-016-4362-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 06/20/2016] [Indexed: 12/14/2022]
Abstract
RATIONALE Evidence links alterations in α5-containing nicotinic receptors (α5*-nAChRs) to nicotine addiction. Notably, the rs16969968 polymorphism in the α5 gene (α5SNP) increases the risk for heavy smoking and impairs nicotine-rewarding properties in mice. Additional work is needed to understand how native and polymorphic α5*-nAChRs contribute to processes associated with the risk for nicotine addiction. OBJECTIVES We aimed at understanding the contribution of α5*-nAChRs to endophenotypes like increased responses to novelty and anxiety, known to promote vulnerability to addiction, and to the response of the dopamine and serotonin systems to nicotine. METHODS Behavioural phenotypes were investigated in mice lacking the α5 gene (α5(-/-)). Nicotine injections were performed to test the consequences of nicotine exposure on the phenotypes identified. Dopamine and serotonin signalling were assessed using in vivo microdialysis and electrophysiology. We used lentiviral vectors to compare the consequences of re-expressing either the α5 wild-type allele or the α5SNP in specific brain areas of α5(-/-) mice. RESULTS α5(-/-) mice did not exhibit high responses to novelty but showed decreased novelty-induced rearing behaviour together with high anxiety. Exposure to high doses of nicotine rescued these phenotypes. We identified altered spontaneous and nicotine-elicited serotonin and dopamine activity in α5(-/-) mice. Re-expression of α5 in the ventral tegmental area and hippocampus rescued rearing and anxiety levels in α5(-/-) mice, respectively. When expressing the α5SNP instead, this resulted in a knockout-like phenotype for both behaviours. CONCLUSIONS We propose that altered α5*-nAChR cholinergic signalling contributes to emotional/behavioural impairments that may be alleviated by nicotine consumption.
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Affiliation(s)
- Morgane Besson
- Neurobiologie Intégrative des Systèmes Cholinergiques, Département de Neuroscience, CNRS UMR 3571, Institut Pasteur, Paris, 75724 cedex15, France.
| | - Stefania Guiducci
- Department of Biomedical, Metabolic and Neural Sciences, Section of Physiology and Neurosciences, University of Modena and Reggio Emilia, Modena, 41121, Italy
| | - Sylvie Granon
- Neurobiologie de la Prise de Décision, Neuro-PSI, CNRS UMR 9197, Orsay, 91405, France
| | - Jean-Philippe Guilloux
- Neuropharmacologie des troubles anxieux-dépressifs et neurogénèse, Université Paris-Sud XI, Chatenay-Malabry, 91290, France
| | - Bruno Guiard
- Neuropharmacologie des troubles anxieux-dépressifs et neurogénèse, Université Paris-Sud XI, Chatenay-Malabry, 91290, France
| | - Christelle Repérant
- Neuropharmacologie des troubles anxieux-dépressifs et neurogénèse, Université Paris-Sud XI, Chatenay-Malabry, 91290, France
| | - Philippe Faure
- Neurobiologie des processus adaptatifs, Neurophysiologie et Comportement, Université Pierre et Marie Curie, Paris, 75005, France
| | - Stéphanie Pons
- Neurobiologie Intégrative des Systèmes Cholinergiques, Département de Neuroscience, CNRS UMR 3571, Institut Pasteur, Paris, 75724 cedex15, France
| | - Giuseppe Cannazza
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, 41121, Italy
| | - Michele Zoli
- Department of Biomedical, Metabolic and Neural Sciences, Section of Physiology and Neurosciences, University of Modena and Reggio Emilia, Modena, 41121, Italy
| | - Alain M Gardier
- Neuropharmacologie des troubles anxieux-dépressifs et neurogénèse, Université Paris-Sud XI, Chatenay-Malabry, 91290, France
| | - Uwe Maskos
- Neurobiologie Intégrative des Systèmes Cholinergiques, Département de Neuroscience, CNRS UMR 3571, Institut Pasteur, Paris, 75724 cedex15, France
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Besson M, Forget B. Cognitive Dysfunction, Affective States, and Vulnerability to Nicotine Addiction: A Multifactorial Perspective. Front Psychiatry 2016; 7:160. [PMID: 27708591 PMCID: PMC5030478 DOI: 10.3389/fpsyt.2016.00160] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 09/06/2016] [Indexed: 11/17/2022] Open
Abstract
Although smoking prevalence has declined in recent years, certain subpopulations continue to smoke at disproportionately high rates and show resistance to cessation treatments. Individuals showing cognitive and affective impairments, including emotional distress and deficits in attention, memory, and inhibitory control, particularly in the context of psychiatric conditions, such as attention-deficit hyperactivity disorder, schizophrenia, and mood disorders, are at higher risk for tobacco addiction. Nicotine has been shown to improve cognitive and emotional processing in some conditions, including during tobacco abstinence. Self-medication of cognitive deficits or negative affect has been proposed to underlie high rates of tobacco smoking among people with psychiatric disorders. However, pre-existing cognitive and mood disorders may also influence the development and maintenance of nicotine dependence, by biasing nicotine-induced alterations in information processing and associative learning, decision-making, and inhibitory control. Here, we discuss the potential forms of contribution of cognitive and affective deficits to nicotine addiction-related processes, by reviewing major clinical and preclinical studies investigating either the procognitive and therapeutic action of nicotine or the putative primary role of cognitive and emotional impairments in addiction-like features.
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Affiliation(s)
- Morgane Besson
- Unité de Neurobiologie Intégrative des Systèmes Cholinergiques, Department of Neuroscience, CNRS UMR 3571, Institut Pasteur , Paris , France
| | - Benoît Forget
- Unité de Neurobiologie Intégrative des Systèmes Cholinergiques, Department of Neuroscience, CNRS UMR 3571, Institut Pasteur , Paris , France
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Maternal nicotine exposure during lactation alters food preference, anxiety-like behavior and the brain dopaminergic reward system in the adult rat offspring. Physiol Behav 2015; 149:131-41. [DOI: 10.1016/j.physbeh.2015.05.040] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 05/26/2015] [Accepted: 05/31/2015] [Indexed: 11/18/2022]
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Falco AM, Bevins RA. Individual differences in the behavioral effects of nicotine: A review of the preclinical animal literature. Pharmacol Biochem Behav 2015; 138:80-90. [PMID: 26410616 DOI: 10.1016/j.pbb.2015.09.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 09/17/2015] [Accepted: 09/23/2015] [Indexed: 12/16/2022]
Abstract
Not everyone who tries tobacco or other nicotine-containing products becomes a long-term user. Certain traits or factors that are differentially present in these individuals must be able to help health care providers and researchers determine who is more likely to become chronic users of nicotine-containing products. Some of these factors, particularly sensation-seeking/novelty, impulsivity, and anxiety, lend themselves to the creation of animal models of reactivity to nicotine. These models of reactivity to nicotine can improve the translational aspects of preclinical animal research on nicotine-induced behaviors and treatments in order to help reduce negative outcomes in human populations. The goal of this review is to evaluate the current status of animal models of individual differences that serve to predict the later behavioral effects of nicotine. The limited utility and inconsistency of existing novelty models is considered, as well as the promise of impulsivity and anxiety models in preclinical animal populations. Finally, other models that could be employed to extend the benefit of the current research are examined.
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Affiliation(s)
- Adriana M Falco
- Department of Psychology, Concord University, Athens, WV 24712-1000, United States.
| | - Rick A Bevins
- Department of Psychology, University of Nebraska-Lincoln, Lincoln, NE 68588-0308, United States
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Hall FS, Der-Avakian A, Gould TJ, Markou A, Shoaib M, Young JW. Negative affective states and cognitive impairments in nicotine dependence. Neurosci Biobehav Rev 2015; 58:168-85. [PMID: 26054790 DOI: 10.1016/j.neubiorev.2015.06.004] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 02/13/2015] [Accepted: 06/03/2015] [Indexed: 10/23/2022]
Abstract
Smokers have substantial individual differences in quit success in response to current treatments for nicotine dependence. This observation may suggest that different underlying motivations for continued tobacco use across individuals and nicotine cessation may require different treatments in different individuals. Although most animal models of nicotine dependence emphasize the positive reinforcing effects of nicotine as the major motivational force behind nicotine use, smokers generally report that other consequences of nicotine use, including the ability of nicotine to alleviate negative affective states or cognitive impairments, as reasons for continued smoking. These states could result from nicotine withdrawal, but also may be associated with premorbid differences in affective and/or cognitive function. Effects of nicotine on cognition and affect may alleviate these impairments regardless of their premorbid or postmorbid origin (e.g., before or after the development of nicotine dependence). The ability of nicotine to alleviate these symptoms would thus negatively reinforce behavior, and thus maintain subsequent nicotine use, contributing to the initiation of smoking, the progression to dependence and relapse during quit attempts. The human and animal studies reviewed here support the idea that self-medication for pre-morbid and withdrawal-induced impairments may be more important factors in nicotine addiction and relapse than has been previously appreciated in preclinical research into nicotine dependence. Given the diverse beneficial effects of nicotine under these conditions, individuals might smoke for quite different reasons. This review suggests that inter-individual differences in the diverse effects of nicotine associated with self-medication and negative reinforcement are an important consideration in studies attempting to understand the causes of nicotine addiction, as well as in the development of effective, individualized nicotine cessation treatments.
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Affiliation(s)
- F Scott Hall
- Department of Pharmacology and Experimental Therapeutics, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, OH, USA.
| | - Andre Der-Avakian
- Department of Psychiatry, University of California San Diego, La Jolla, CA, USA
| | - Thomas J Gould
- Department of Psychology, Temple University, Philadelphia, PA, USA
| | - Athina Markou
- Department of Psychiatry, University of California San Diego, La Jolla, CA, USA
| | - Mohammed Shoaib
- Institute of Neuroscience, Newcastle University, Newcastle, UK
| | - Jared W Young
- Department of Psychiatry, University of California San Diego, La Jolla, CA, USA; Research Service, VA San Diego Healthcare System, San Diego, CA, USA
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Abreu-Villaça Y, Filgueiras CC, Correa-Santos M, Cavina CC, Naiff VF, Krahe TE, Manhães AC, Ribeiro-Carvalho A. Tobacco smoke containing high or low levels of nicotine during adolescence: effects on novelty-seeking and anxiety-like behaviors in mice. Psychopharmacology (Berl) 2015; 232:1693-703. [PMID: 25401170 DOI: 10.1007/s00213-014-3801-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 10/31/2014] [Indexed: 01/11/2023]
Abstract
RATIONALE Thousands of adolescents start smoking daily but information on the effects of tobacco exposure on this age group is scarce. Moreover, the available animal models rely on the effects of nicotine, neglecting other neuroactive components of tobacco. OBJECTIVES We investigated the effects of exposure of adolescent mice to tobacco smoke generated from cigarettes containing either high or low levels of nicotine on novelty seeking and anxiety-like behaviors. METHODS From postnatal day (PN) 30 to 45, male and female Swiss mice were exposed to tobacco smoke (whole body exposure, 8 h/day, 7 days/week) generated from 2R1F (HighNic group: 1.74 mg nicotine/cigarette) or 4A1 (LowNic group: 0.14 mg nicotine/cigarette) research cigarettes, whereas control mice were exposed to ambient air. By the end (PN44-45), shortly (PN49-50), or long after (PN74-75) exposure, mice were tested on the elevated plus maze and on the hole board. RESULTS While HighNic mice presented an increased number of head-dips (increased novelty-seeking) and decreased grooming (increased anxiety-like behavior) by the end of adolescent exposure, only the latter effect persisted shortly after its end. Distinctively, LowNic mice presented reduced head-dips both by the end and shortly after exposure as well as decreased grooming shortly and long after the end of exposure. Interestingly, only HighNic mice presented detectable cotinine (nicotine metabolite) serum levels (109.1 ± 24.0 ng/ml). CONCLUSION Our results demonstrate that even adolescent exposure to tobacco smoke with very low nicotine content can have significant short- and long-term behavioral effects, supporting the hypothesis that adolescents can be particularly vulnerable to the effects of cigarette consumption.
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Affiliation(s)
- Yael Abreu-Villaça
- Laboratório de Neurofisiologia, Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro (UERJ), Av. Prof. Manuel de Abreu 444, 5 andar - Vila Isabel, Rio de Janeiro, RJ, 20550-170, Brazil,
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Cohen A, Treweek J, Edwards S, Leão RM, Schulteis G, Koob GF, George O. Extended access to nicotine leads to a CRF1 receptor dependent increase in anxiety-like behavior and hyperalgesia in rats. Addict Biol 2015; 20:56-68. [PMID: 23869743 DOI: 10.1111/adb.12077] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Tobacco dependence is associated with the emergence of negative emotional states during withdrawal, including anxiety and nociceptive hypersensitivity. However, the current animal models of nicotine dependence have focused on the mechanisms that mediate the acute reinforcing effects of nicotine and failed to link increased anxiety and pain during abstinence with excessive nicotine self-administration. Here, we tested the hypothesis that the activation of corticotropin-releasing factor-1 (CRF1 ) receptors and emergence of the affective and motivational effects of nicotine abstinence only occur in rats with long access (>21 hours/day, LgA) and not short (1 hour/day, ShA) access to nicotine self-administration. ShA and LgA rats were tested for anxiety-like behavior, nociceptive thresholds, somatic signs of withdrawal and nicotine intake after 3 days of abstinence. The role of CRF1 receptors during abstinence was tested using systemic or intracerebral infusion of MPZP (N,N-bis(2-methoxyethyl)-3-(4-methoxy-2-methylphenyl)-2,5-dimethyl-pyrazolo(1,5α)pyrimidin-7-amine), a CRF1 receptor antagonist, in the central nucleus of the amygdala (CeA). LgA but not ShA rats exhibited abstinence-induced increases in anxiety-like behavior and nociceptive hypersensitivity, which both predicted subsequent excessive nicotine intake and were prevented by systemic administration of MPZP. Intra-CeA MPZP infusion prevented abstinence-induced increases in nicotine intake and nociceptive hypersensitivity. These findings demonstrate that the model of short access to nicotine self-administration has limited validity for tobacco dependence, highlight the translational relevance of the model of extended-intermittent access to nicotine self-administration for tobacco dependence and demonstrate that activation of CRF1 receptors is required for the emergence of abstinence-induced anxiety-like behavior, hyperalgesia and excessive nicotine intake.
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Affiliation(s)
- Ami Cohen
- The Scripps Research Institute; La Jolla CA USA
| | | | | | | | - Gery Schulteis
- Research Service; VA San Diego Healthcare System; San Diego CA USA
- Department of Anesthesiology; University of California San Diego School of Medicine; La Jolla CA USA
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Higher sensitivity to the conditioned rewarding effects of cocaine and MDMA in High-Novelty-Seekers mice exposed to a cocaine binge during adolescence. Psychopharmacology (Berl) 2015; 232:101-13. [PMID: 24908272 DOI: 10.1007/s00213-014-3642-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Accepted: 05/23/2014] [Indexed: 10/25/2022]
Abstract
RATIONALE Exposure to drugs during adolescence can induce alterations in the central nervous system. The novelty-seeking personality trait influences differences observed among individuals exposed to drugs of abuse. OBJECTIVES Long-term effects of intensive pre-treatment with cocaine during adolescence or adulthood were evaluated in High- and Low-Novelty Seeker (HNS and LNS) mice. It was hypothesized that a cocaine binge during adolescence would increase sensitivity to the rewarding effects of cocaine and MDMA, especially in HNS animals, and modify the spontaneous behaviour of adult animals. METHODS Adolescent (PND 33) and adult (PND 60) mice were identified as HNS or LNS according to their performance in the hole-board test. Subsequently, they received pre-treatment with cocaine (three injections per day of an increasing dose for 10 days) or saline. Three weeks later, the mice performed the hole-board, elevated plus maze, spontaneous locomotor activity and cocaine- (1 mg/kg) or MDMA- (1.25 mg/kg) induced conditioning place preference (CPP) tests. In another set of mice, the effects of pre-treatment of cocaine during adulthood on MDMA- or cocaine-induced CPP were also evaluated 3 weeks later. RESULTS Only HNS mice treated with cocaine during adolescence acquired MDMA- or cocaine-induced CPP in adulthood. Moreover, pre-exposure to cocaine during adolescence caused subsequent behavioural alterations, including reduced exploratory behaviour and increased locomotor reactivity. CONCLUSIONS Cocaine binge administration during adolescence induces a higher sensitivity to the rewarding effects of MDMA and cocaine in HNS mice in adulthood. This may explain the greater vulnerability often seen among individuals exposed early in life to drugs of abuse.
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20
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Liu J, Wei W, Kuang H, Tsien JZ, Zhao F. Heart rate and heart rate variability assessment identifies individual differences in fear response magnitudes to earthquake, free fall, and air puff in mice. PLoS One 2014; 9:e93270. [PMID: 24667366 PMCID: PMC3965551 DOI: 10.1371/journal.pone.0093270] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Accepted: 03/03/2014] [Indexed: 01/04/2023] Open
Abstract
Fear behaviors and fear memories in rodents have been traditionally assessed by the amount of freezing upon the presentation of conditioned cues or unconditioned stimuli. However, many experiences, such as encountering earthquakes or accidental fall from tree branches, may produce long-lasting fear memories but are behaviorally difficult to measure using freezing parameters. Here, we have examined changes in heartbeat interval dynamics as physiological readout for assessing fearful reactions as mice were subjected to sudden air puff, free-fall drop inside a small elevator, and a laboratory-version earthquake. We showed that these fearful events rapidly increased heart rate (HR) with simultaneous reduction of heart rate variability (HRV). Cardiac changes can be further analyzed in details by measuring three distinct phases: namely, the rapid rising phase in HR, the maximum plateau phase during which HRV is greatly decreased, and the recovery phase during which HR gradually recovers to baseline values. We showed that durations of the maximum plateau phase and HR recovery speed were quite sensitive to habituation over repeated trials. Moreover, we have developed the fear resistance index based on specific cardiac response features. We demonstrated that the fear resistance index remained largely consistent across distinct fearful events in a given animal, thereby enabling us to compare and rank individual mouse’s fear responsiveness among the group. Therefore, the fear resistance index described here can represent a useful parameter for measuring personality traits or individual differences in stress-susceptibility in both wild-type mice and post-traumatic stress disorder (PTSD) models.
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Affiliation(s)
- Jun Liu
- Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Brain Functional Genomics, East China Normal University, Shanghai, China
- Brain and Behavior Discovery Institute and Department of Neurology, Medical College of Georgia, Georgia Regents University, Augusta, Georgia, United States of America
| | - Wei Wei
- Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Brain Functional Genomics, East China Normal University, Shanghai, China
- Brain and Behavior Discovery Institute and Department of Neurology, Medical College of Georgia, Georgia Regents University, Augusta, Georgia, United States of America
| | - Hui Kuang
- Banna Biomedical Research Institute, Xi-Shuang-Ban-Na Prefecture, Yunnan, China
- Brain and Behavior Discovery Institute and Department of Neurology, Medical College of Georgia, Georgia Regents University, Augusta, Georgia, United States of America
| | - Joe Z. Tsien
- Banna Biomedical Research Institute, Xi-Shuang-Ban-Na Prefecture, Yunnan, China
- Brain and Behavior Discovery Institute and Department of Neurology, Medical College of Georgia, Georgia Regents University, Augusta, Georgia, United States of America
- * E-mail: (JZT); (FZ)
| | - Fang Zhao
- Banna Biomedical Research Institute, Xi-Shuang-Ban-Na Prefecture, Yunnan, China
- Brain and Behavior Discovery Institute and Department of Neurology, Medical College of Georgia, Georgia Regents University, Augusta, Georgia, United States of America
- * E-mail: (JZT); (FZ)
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Bernardi RE, Spanagel R. Basal activity level in mice predicts the initial and sensitized locomotor response to nicotine only in high responders. Behav Brain Res 2014; 264:143-50. [PMID: 24508239 DOI: 10.1016/j.bbr.2014.01.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Accepted: 01/28/2014] [Indexed: 02/05/2023]
Abstract
Not all humans become addicted to drugs of abuse following casual use. Thus, it is important to identify factors that may contribute to subsequent drug responding. Previous studies have identified characteristics such as novelty-seeking, impulsivity, and anxiety as factors involved in the progression to drug dependence. The current experiment investigated basal locomotor activity in C57Bl/6N mice as a potential predictor of subsequent nicotine responses. We examined the ability of differences in basal locomotor activity to predict the acute and sensitized response to nicotine, as well as nicotine conditioned reinforcement. A median split was used to distinguish between low and high responders with regard to basal locomotor activity in mice. We then measured the acute response to nicotine (0.5mg/kg IP) in these mice, followed by measures of conditioned place preference (CPP; 0.5mg/kg IP) and locomotor sensitization (0.5mg/kg IP), to determine whether basal locomotion is predictive of subsequent responding to nicotine. High, but not low, basal activity was found to be a predictor of both the acute and sensitized response to nicotine. Interestingly, only mice classified as having low basal activity demonstrated a significant CPP, suggesting that pre-exposure to nicotine differentially affects conditioned reinforcement on the basis of initial activity level. Basal locomotor activity may be an efficient measure of subsequent locomotor responding to nicotine, but only in animals classified as having high basal activity. However, animals with low basal locomotor activity may be more susceptible to the reinforcing properties of nicotine.
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Affiliation(s)
- Rick E Bernardi
- Institute of Psychopharmacology, Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University, J5 68159 Mannheim, Germany.
| | - Rainer Spanagel
- Institute of Psychopharmacology, Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University, J5 68159 Mannheim, Germany
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Fraga MC, de Moura EG, da Silva Lima N, Lisboa PC, de Oliveira E, Silva JO, Claudio-Neto S, Filgueiras CC, Abreu-Villaça Y, Manhães AC. Anxiety-like, novelty-seeking and memory/learning behavioral traits in male Wistar rats submitted to early weaning. Physiol Behav 2014; 124:100-6. [DOI: 10.1016/j.physbeh.2013.11.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 10/25/2013] [Accepted: 11/06/2013] [Indexed: 10/26/2022]
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Natividad LA, Torres OV, Friedman TC, O'Dell LE. Adolescence is a period of development characterized by short- and long-term vulnerability to the rewarding effects of nicotine and reduced sensitivity to the anorectic effects of this drug. Behav Brain Res 2013; 257:275-85. [PMID: 24120402 DOI: 10.1016/j.bbr.2013.10.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 09/27/2013] [Accepted: 10/02/2013] [Indexed: 02/06/2023]
Abstract
This study compared nicotine intake and changes in food intake and weight gain in naïve adolescent, naïve adult, and adult rats that were exposed to nicotine during adolescence. An extended intravenous self-administration (IVSA) model was used whereby rats had 23-hour access to saline or increasing doses of nicotine (0.03, 0.06, and 0.09 mg/kg/0.1 mL infusion) for 4-day intervals separated by 3-day periods of abstinence. Rats began IVSA as adolescents (PND 32-34) or adults (PND 75). A separate group of rats was exposed to nicotine via osmotic pumps (4.7 mg/kg) for 14 days during adolescence and then began nicotine IVSA as adults (PND 75). The rats that completed the nicotine IVSA regimen were also tested for nicotine-seeking behavior during extinction. The results revealed that nicotine intake was highest in adolescents followed by adults that were pre-exposed to nicotine during adolescence as compared to naïve adults. A similar pattern of nicotine-seeking behavior was observed during extinction. In contrast to nicotine intake, naïve adults displayed robust appetite and weight suppressant effects of nicotine, an effect that was absent in adolescents and adults that were pre-exposed to nicotine during adolescence. Our findings suggest that adolescence is a unique period of enhanced vulnerability to the reinforcing effects of nicotine. Although adolescents gain weight faster than adults, the food intake and weight suppressant effects of nicotine are reduced during adolescence. Importantly, our findings suggest that adolescent nicotine exposure produces long-lasting consequences that enhance nicotine reward and promote tolerance to the anorectic effects of this drug.
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Affiliation(s)
- Luis A Natividad
- Department of Psychology, University of Texas at El Paso, 500 West University Avenue, El Paso, TX 79968, United States; Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States
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Varlinskaya EI, Vetter-O'Hagen CS, Spear LP. Puberty and gonadal hormones: role in adolescent-typical behavioral alterations. Horm Behav 2013; 64:343-9. [PMID: 23998677 PMCID: PMC3761212 DOI: 10.1016/j.yhbeh.2012.11.012] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Revised: 10/30/2012] [Accepted: 11/14/2012] [Indexed: 11/22/2022]
Abstract
This article is part of a Special Issue "Puberty and Adolescence". Adolescence is characterized by a variety of behavioral alterations, including elevations in novelty-seeking and experimentation with alcohol and other drugs of abuse. Some adolescent-typical neurobehavioral alterations may depend upon pubertal rises in gonadal hormones, whereas others may be unrelated to puberty. Using a variety of approaches, studies in laboratory animals have not revealed clear relationships between pubertal-related changes and adolescent- or adult-typical behaviors that are not strongly sexually dimorphic. Data reviewed suggest surprisingly modest influences of gonadal hormones on alcohol intake, alcohol preference and novelty-directed behaviors. Gonadectomy in males (but not females) increased ethanol intake in adulthood following surgery either pre-pubertally or in adulthood, with these increases in intake largely reversed by testosterone replacement in adulthood, supporting an activational role of androgens in moderating ethanol intake in males. In contrast, neither pre-pubertal nor adult gonadectomy influenced sensitivity to the social inhibitory or aversive effects of ethanol when indexed via conditioned taste aversions, although gonadectomy at either age altered the microstructure of social behavior of both males and females. Unexpectedly, the pre-pubertal surgical manipulation process itself was found to increase later ethanol intake, decrease sensitivity to ethanol's social inhibitory effects, attenuate novelty-directed behavior and lower social motivation, with gonadal hormones being necessary for these long-lasting effects of early surgical perturbations.
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Affiliation(s)
- Elena I Varlinskaya
- Center for Development and Behavioral Neuroscience, Department of Psychology, Binghamton University, Binghamton, NY 13902-6000, USA.
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Carrasco MC, Vidal J, Redolat R. Bupropion induced changes in exploratory and anxiety-like behaviour in NMRI male mice depends on the age. Behav Processes 2013; 98:117-24. [PMID: 23727544 DOI: 10.1016/j.beproc.2013.05.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Revised: 03/08/2013] [Accepted: 05/09/2013] [Indexed: 12/15/2022]
Abstract
The aim of this study was to assess the effects of the antidepressant bupropion on anxiety and novelty-seeking in adolescent mice of different ages and adults. Behavioural differences between early adolescent, late adolescent and adult NMRI mice were measured both in the elevated plus-maze and the hole-board tasks following acute administration of bupropion (5, 10, 15, 20mg/kg) or saline. In the plus maze test, early and late adolescent mice treated with bupropion (10, 15mg/kg, respectively) had lower percentages of entries in the open-arms compared to their vehicle controls. Adult mice treated with bupropion did not differ from their vehicle controls. These results suggest that the effect of this drug on anxiety-like behaviour in mice depends on the age, showing adolescents an anxiogenic-like profile. In the hole-board, adolescents showed more elevated levels of novelty-seeking than adults, exhibiting shorter latency to the first head-dip (HD) and a higher number of HD's. Bupropion increases the latency to the first HD and decreases the number of HD's in all age-groups, indicating a decline in exploratory tendency. Findings reveal that the age can modulate the behaviour displayed by mice in both animal models, and that adolescents are more sensitive to bupropion's anxiogenic effects.
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Affiliation(s)
- M Carmen Carrasco
- Departamento Psicobiología, Facultad de Psicología, Universitat de València, Blasco Ibañez, 21, Valencia 46010, Spain.
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Behavioral effects of combined environmental enrichment and chronic nicotine administration in male NMRI mice. Physiol Behav 2013; 114-115:65-76. [DOI: 10.1016/j.physbeh.2013.03.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Revised: 09/27/2012] [Accepted: 03/12/2013] [Indexed: 12/18/2022]
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Thanos PK, Robison LS, Robinson JK, Michaelides M, Wang GJ, Volkow ND. Obese rats with deficient leptin signaling exhibit heightened sensitivity to olfactory food cues. Synapse 2013; 67:171-8. [PMID: 23172699 PMCID: PMC3578169 DOI: 10.1002/syn.21627] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Accepted: 11/13/2012] [Indexed: 01/23/2023]
Abstract
The Zucker rat is used as a model of genetic obesity, and while Zucker rats have been well studied for their reduced sensitivity to leptin signaling and subsequent weight gain, little work has examined their responses to environmental signals that are associated with "hedonic" feeding. This study evaluated the effects of a high-fat food olfactory cue (bacon) in stimulating nose-poke food-seeking behavior on first exposure (novel) and after a period of access for consumption (familiar) in lean and obese Zucker rats at either 4 or 12 months of age, and under ad-lib fed (unrestricted; U) or chronically food-restricted (70% of ad-lib; R) conditions. Baseline nose-poke levels were comparable amongst all groups. At 4 months of age, only ObU rats displayed increased behavioral activation to familiar food cues. Twelve-month-old Ob rats, regardless of diet, exhibited substantially greater food-seeking behavior when exposed to both the novel and familiar olfactory cues. A strong positive correlation between body weight and nose-poke entries for the familiar food cue was observed at both ages, while this correlation for the novel food cue was significant in 12-month-old rats only. Similarly, there were strong positive correlations between food intake and poke entries for the familiar food cue was observed at both ages, while this correlation for the novel food cue was significant in 12-month-old rats only. Although it is possible that differences in olfactory sensitivity contribute to these behavioral effects, our findings support the interactions between food intake, obesity, and food-seeking behavior and are consistent with leptin inhibiting the brain's reactivity to food cues and suggest that the enhanced sensitivity to the food cues with leptin deficiency is likely to contribute to overeating and weight gain.
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Affiliation(s)
- Panayotis K Thanos
- Laboratory of Neuroimaging, National Institute on Alcohol Abuse and Alcoholism, NIH, Bethesda, Maryland 20892, USA.
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Bardo MT, Neisewander JL, Kelly TH. Individual differences and social influences on the neurobehavioral pharmacology of abused drugs. Pharmacol Rev 2013; 65:255-90. [PMID: 23343975 PMCID: PMC3565917 DOI: 10.1124/pr.111.005124] [Citation(s) in RCA: 130] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The interaction of drugs with biologic targets is a critical area of research, particularly for the development of medications to treat substance use disorders. In addition to understanding these drug-target interactions, however, there is a need to understand more fully the psychosocial influences that moderate these interactions. The first section of this review introduces some examples from human behavioral pharmacology that illustrate the clinical importance of this research. The second section covers preclinical evidence to characterize some of the key individual differences that alter drug sensitivity and abuse vulnerability, related primarily to differences in response to novelty and impulsivity. Evidence is presented to indicate that critical neuropharmacological mechanisms associated with these individual differences involve integrated neurocircuits underlying stress, reward, and behavioral inhibitory processes. The third section covers social influences on drug abuse vulnerability, including effects experienced during infancy, adolescence, and young adulthood, such as maternal separation, housing conditions, and social interactions (defeat, play, and social rank). Some of the same neurocircuits involved in individual differences also are altered by social influences, although the precise neurochemical and cellular mechanisms involved remain to be elucidated fully. Finally, some speculation is offered about the implications of this research for the prevention and treatment of substance abuse.
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Affiliation(s)
- M T Bardo
- Department of Psychology, University of Kentucky, BBSRB Room 447, 741 S. Limestone, Lexington, KY 40536-0509, USA.
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Vetter-O'Hagen CS, Spear LP. Hormonal and physical markers of puberty and their relationship to adolescent-typical novelty-directed behavior. Dev Psychobiol 2012; 54:523-35. [PMID: 21953609 PMCID: PMC3288810 DOI: 10.1002/dev.20610] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2011] [Accepted: 08/23/2011] [Indexed: 12/18/2022]
Abstract
The extent to which characteristic adolescent behaviors are associated with pubertal changes or driven by more general, puberty-independent developmental alterations is largely unknown. Using physiological and hormonal markers of puberty, this experiment characterized pubertal timing across adolescence and examined the relationships among these variables and novelty-directed behaviors. Males and females were tested for response to novelty at P28, P32, P36, P40, P44, P48, and P75, and examined for balano-preputial skinfold separation and sperm presence (males) or vaginal opening (females), followed by blood collection for hormonal assessments. Despite earlier pubertal maturation in females, with maturation generally completed by P36 in females and P44 in males, novelty-directed behavior peaked at P32 and P36 in both sexes, and was unrelated to pubertal measures. These data support the suggestion that the ontogenetic peak in this behavior during adolescence is not notably puberty dependent.
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Affiliation(s)
- Courtney S Vetter-O'Hagen
- Center for Development and Behavioral Neuroscience, Developmental Exposure to Alcohol Research Center, Department of Psychology, Binghamton University, Binghamton, NY 13902-6000, USA.
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Locklear LL, McDonald CG, Smith RF, Fryxell KJ. Adult mice voluntarily progress to nicotine dependence in an oral self-selection assay. Neuropharmacology 2012; 63:582-92. [PMID: 22583831 DOI: 10.1016/j.neuropharm.2012.04.037] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2011] [Revised: 04/11/2012] [Accepted: 04/28/2012] [Indexed: 12/12/2022]
Abstract
Nicotine has both rewarding and aversive properties in rodents, as shown by intravenous self-administration, intracranial self-stimulation, and conditioned place preference experiments. However, high throughput models of nicotine reward have not been developed in mice. In previous two-bottle studies, mice often chose to drink less from the nicotine bottle than from the water bottle, which raises the question whether these paradigms provide a model of the reinforcing properties of oral nicotine. We hypothesized that previous two-bottle choice paradigms included factors (such as the brief duration of trials, the addition of flavorings to both bottles, water bottles located relatively close to each other, etc.) that may have obstructed the formation of a learned association between the taste of nicotine and its delayed pharmacological effects. Here we show that a paradigm designed to simplify the acquisition of a learned association resulted in nicotine consumption by various strains and sexes that diverged progressively over a period of seven weeks. The strain and sex with the highest nicotine consumption (C57BL/6J females) showed steady and statistically significant increases in nicotine consumption throughout this period. C57BL/6J females were clearly responding to the reinforcing properties of nicotine because they chose to drink over 70% of their fluids from the nicotine bottle. Moreover, they became nicotine dependent, as shown by highly significant nicotine withdrawal symptoms after the nicotine bottle was removed. The strain and sex with the lowest consumption (A/J males) showed a significant decrease in nicotine consumption, and by the end of the experiment were drinking only 24% of their fluids from the nicotine bottle.
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Affiliation(s)
- Laura L Locklear
- School of Systems Biology, George Mason University, Manassas, VA, USA
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Morganstern I, Barson JR, Leibowitz SF. Regulation of drug and palatable food overconsumption by similar peptide systems. ACTA ACUST UNITED AC 2012; 4:163-73. [PMID: 21999690 DOI: 10.2174/1874473711104030163] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2011] [Revised: 08/04/2011] [Accepted: 08/04/2011] [Indexed: 11/22/2022]
Abstract
This review is aimed at understanding some of the common neurochemical, behavioral and physiological determinants of drug and food overconsumption. Much current work has been devoted to determining the similarities between the brain circuits controlling excessive use of addictive drugs and the overconsumption of palatable foods. The brain systems involved likely include peptides of both mesolimbic and hypothalamic origin. Evidence gathered from expression and injection studies suggests that the consumption of drugs, such as ethanol and nicotine, and also of palatable foods rich in fat is stimulated by different orexigenic peptides, such as enkephalin, galanin, orexin, and melaninconcentrating hormone, acting within the hypothalamus or various limbic structures, while another peptide, neuropeptide Y, is closely related to carbohydrate consumption and shows an inverse relationship with ethanol and nicotine consumption. Moreover, studies in animal models suggest that a propensity to overconsume these reinforcing substances may result from preexisting disturbances in these same peptide systems. These neurochemical disturbances, in turn, may also be closely linked to specific behaviors associated with excessive consummatory behavior, such as hyperactivity or novelty-seeking, palatable food preference, and also fluctuations in circulating lipid levels. Clear understanding of the relationship between these various determinants of consummatory behavior will allow researchers to effectively predict and examine at early stages of exposure animals that are prone to drug and food overconsumption. This work may ultimately aid in the identification of inherent traits that increase the risk for drug abuse and palatable food overconsumption.
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Affiliation(s)
- Irene Morganstern
- Laboratory of Behavioral Neurobiology, The Rockefeller University, New York, NY 10065, USA
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Hall FS, Markou A, Levin ED, Uhl GR. Mouse models for studying genetic influences on factors determining smoking cessation success in humans. Ann N Y Acad Sci 2012; 1248:39-70. [PMID: 22304675 DOI: 10.1111/j.1749-6632.2011.06415.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Humans differ in their ability to quit using addictive substances, including nicotine, the major psychoactive ingredient in tobacco. For tobacco smoking, a substantial body of evidence, largely derived from twin studies, indicates that approximately half of these individual differences in ability to quit are heritable genetic influences that likely overlap with those for other addictive substances. Both twin and molecular genetic studies support overlapping influences on nicotine addiction vulnerability and smoking cessation success, although there is little formal analysis of the twin data that support this important point. None of the current datasets provides clarity concerning which heritable factors might provide robust dimensions around which individuals differ in ability to quit smoking. One approach to this problem is to test mice with genetic variations in genes that contain human variants that alter quit success. This review considers which features of quit success should be included in a comprehensive approach to elucidate the genetics of quit success, and how those features may be modeled in mice.
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Affiliation(s)
- F Scott Hall
- Molecular Neurobiology Branch, NIH-IRP, NIDA, Baltimore, Maryland 21224, USA
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Abstract
Nicotine addiction is a complex process that begins with self-administration. Consequently, this process has been studied extensively using animal models. A person is usually not called "smoker" if s/he has smoked for a week or a month in a lifetime; in general, a smoker has been smoking for many years. Furthermore, a smoker has free access to cigarettes and can smoke whenever she/he wants, provided there are no social/legal restraints. Subsequently, in an animal model of tobacco addiction, it will be desirable to expose the animal to free access nicotine for 24 hours/day for many weeks, starting at different stages of development.
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Affiliation(s)
- Allan C Collins
- Institute for Behavioral Genetics, University of Colorado, Boulder, Colorado, USA
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Blum K, Chen ALC, Oscar-Berman M, Chen TJH, Lubar J, White N, Lubar J, Bowirrat A, Braverman E, Schoolfield J, Waite RL, Downs BW, Madigan M, Comings DE, Davis C, Kerner MM, Knopf J, Palomo T, Giordano JJ, Morse SA, Fornari F, Barh D, Femino J, Bailey JA. Generational association studies of dopaminergic genes in reward deficiency syndrome (RDS) subjects: selecting appropriate phenotypes for reward dependence behaviors. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2011; 8:4425-59. [PMID: 22408582 PMCID: PMC3290972 DOI: 10.3390/ijerph8124425] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Revised: 11/23/2011] [Accepted: 11/23/2011] [Indexed: 11/26/2022]
Abstract
UNLABELLED Abnormal behaviors involving dopaminergic gene polymorphisms often reflect an insufficiency of usual feelings of satisfaction, or Reward Deficiency Syndrome (RDS). RDS results from a dysfunction in the "brain reward cascade," a complex interaction among neurotransmitters (primarily dopaminergic and opioidergic). Individuals with a family history of alcoholism or other addictions may be born with a deficiency in the ability to produce or use these neurotransmitters. Exposure to prolonged periods of stress and alcohol or other substances also can lead to a corruption of the brain reward cascade function. We evaluated the potential association of four variants of dopaminergic candidate genes in RDS (dopamine D1 receptor gene [DRD1]; dopamine D2 receptor gene [DRD2]; dopamine transporter gene [DAT1]; dopamine beta-hydroxylase gene [DBH]). METHODOLOGY We genotyped an experimental group of 55 subjects derived from up to five generations of two independent multiple-affected families compared to rigorously screened control subjects (e.g., N = 30 super controls for DRD2 gene polymorphisms). Data related to RDS behaviors were collected on these subjects plus 13 deceased family members. RESULTS Among the genotyped family members, the DRD2 Taq1 and the DAT1 10/10 alleles were significantly (at least p < 0.015) more often found in the RDS families vs. controls. The TaqA1 allele occurred in 100% of Family A individuals (N = 32) and 47.8% of Family B subjects (11 of 23). No significant differences were found between the experimental and control positive rates for the other variants. CONCLUSIONS Although our sample size was limited, and linkage analysis is necessary, the results support the putative role of dopaminergic polymorphisms in RDS behaviors. This study shows the importance of a nonspecific RDS phenotype and informs an understanding of how evaluating single subset behaviors of RDS may lead to spurious results. Utilization of a nonspecific "reward" phenotype may be a paradigm shift in future association and linkage studies involving dopaminergic polymorphisms and other neurotransmitter gene candidates.
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Affiliation(s)
- Kenneth Blum
- Department of Psychiatry, School of Medicine and McKnight Brain Institute, University of Florida, W University Ave., Gainesville, FL 32601, USA;
- Department of Nutrigenomics, LifeGen, Inc., P.O. Box 366, 570 Lederach Stattion Way, Lederach, PA 19450, USA; (R.L.W.); (B.W.D.); (M.M.)
- Department of Integrative Medicine, PATH Medical Research Foundation, 304 Park Ave. South, New York, NY 10010, USA; (M.M.K.); (J.K.)
- Department of Holistic Medicine, G&G Holistic Addiction Treatment, Inc., 1590 Northeast 162nd Street, North Miami Beach, FL 33162, USA;
- Department of Research, National Institute for Holistic Addiction Studies, 1590 Northeast 162nd Street, North Miami Beach, FL 33162, USA;
- Dominion Diagnostics, Inc., 211 Circuit Road, North Kingstown, RI 02852, USA;
- Center for Genomics and Applied Gene Technology, Institute of Integrative Omics and Applied Biotechnology, Nonakuri, Purba Medinipur, West Bengal, India;
| | - Amanda L. C. Chen
- Department of Engineering Management Advanced Technology, Chang Jung Christian University, No. 396, Sec. 1, Changrong Road, Tainan 71101, Taiwan
| | - Marlene Oscar-Berman
- Department of Anatomy & Neurobiology, Boston University School of Medicine, 72 East Concord Street, Boston, MA 02118, USA;
| | - Thomas J. H. Chen
- Department of Occupational Safety and Health, Chang Jung Christian University, No. 396, Sec. 1, Changrong Road, Tainan 71101, Taiwan;
| | - Joel Lubar
- Emeritus, Department of Physiology, University of Tennessee, 719 Andy Holt Tower, Knoxville, TN 37996, USA;
| | - Nancy White
- Unique Mindcare, Inc., 1900 Saint James Place, Houston, TX 77056, USA;
| | - Judith Lubar
- Department of Neurofeedback, Southeastern Biofeedback and Neurobehavioral Clinic, 101 Westwood Road, Knoxville, TN 37919, USA;
| | - Abdalla Bowirrat
- Department of Neuroscience & Population Genetics, EMMS Nazareth Hospital, Nazareth, Israel;
| | - Eric Braverman
- Department of Neurosurgery, Weill Cornell College of Medicine, 1300 York Ave., New York, NY 10065, USA;
- Department of Integrative Medicine, PATH Medical Research Foundation, 304 Park Ave. South, New York, NY 10010, USA; (M.M.K.); (J.K.)
| | - John Schoolfield
- Department of Academic Informatics Services, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA;
| | - Roger L. Waite
- Department of Nutrigenomics, LifeGen, Inc., P.O. Box 366, 570 Lederach Stattion Way, Lederach, PA 19450, USA; (R.L.W.); (B.W.D.); (M.M.)
| | - Bernard W. Downs
- Department of Nutrigenomics, LifeGen, Inc., P.O. Box 366, 570 Lederach Stattion Way, Lederach, PA 19450, USA; (R.L.W.); (B.W.D.); (M.M.)
| | - Margaret Madigan
- Department of Nutrigenomics, LifeGen, Inc., P.O. Box 366, 570 Lederach Stattion Way, Lederach, PA 19450, USA; (R.L.W.); (B.W.D.); (M.M.)
| | - David E. Comings
- Department of Genomic Research, Carlsbad Science Foundation, Department of Medical Genetics, City of Hope National Medical Center, 1500 Duarte Road, Duarte, CA 91010, USA;
| | - Caroline Davis
- Department of Kinesiology and Health Sciences, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada;
| | - Mallory M. Kerner
- Department of Integrative Medicine, PATH Medical Research Foundation, 304 Park Ave. South, New York, NY 10010, USA; (M.M.K.); (J.K.)
| | - Jennifer Knopf
- Department of Integrative Medicine, PATH Medical Research Foundation, 304 Park Ave. South, New York, NY 10010, USA; (M.M.K.); (J.K.)
| | - Tomas Palomo
- Hospital Universitario 12 de Octubre, Servicio de Psiquiatria, Av. Cordoba SN, Madrid 28041, Spain;
| | - John J. Giordano
- Department of Holistic Medicine, G&G Holistic Addiction Treatment, Inc., 1590 Northeast 162nd Street, North Miami Beach, FL 33162, USA;
- Department of Research, National Institute for Holistic Addiction Studies, 1590 Northeast 162nd Street, North Miami Beach, FL 33162, USA;
| | - Siobhan A. Morse
- Department of Holistic Medicine, G&G Holistic Addiction Treatment, Inc., 1590 Northeast 162nd Street, North Miami Beach, FL 33162, USA;
- Department of Research, National Institute for Holistic Addiction Studies, 1590 Northeast 162nd Street, North Miami Beach, FL 33162, USA;
| | - Frank Fornari
- Dominion Diagnostics, Inc., 211 Circuit Road, North Kingstown, RI 02852, USA;
| | - Debmalya Barh
- Center for Genomics and Applied Gene Technology, Institute of Integrative Omics and Applied Biotechnology, Nonakuri, Purba Medinipur, West Bengal, India;
| | - John Femino
- Meadows Edge Recovery Center, 580 10 Rod Road, North Kingstown, RI 02852, USA;
| | - John A. Bailey
- Department of Psychiatry, School of Medicine and McKnight Brain Institute, University of Florida, W University Ave., Gainesville, FL 32601, USA;
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Exposure to nicotine and ethanol in adolescent mice: Effects on depressive-like behavior during exposure and withdrawal. Behav Brain Res 2011; 221:282-9. [DOI: 10.1016/j.bbr.2011.03.014] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Revised: 03/02/2011] [Accepted: 03/06/2011] [Indexed: 12/26/2022]
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Fraga MC, Moura EG, Silva JO, Bonomo IT, Filgueiras CC, Abreu-Villaça Y, Passos MCF, Lisboa PC, Manhães AC. Maternal prolactin inhibition at the end of lactation affects learning/memory and anxiety-like behaviors but not novelty-seeking in adult rat progeny. Pharmacol Biochem Behav 2011; 100:165-73. [PMID: 21777608 DOI: 10.1016/j.pbb.2011.07.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Revised: 07/05/2011] [Accepted: 07/07/2011] [Indexed: 12/13/2022]
Abstract
Maternal hypoprolactinemia at the end of lactation in rats reduces milk production and is associated with offspring's malnutrition. Since malnutrition during development is also known to have long lasting effects on cognition and emotion, in the present study we tested the hypothesis that maternal hypoprolactinemia, induced by bromocriptine treatment, at the end of the lactating period affects memory/learning, novelty-seeking and anxiety-like behaviors in adult male Wistar rats using, respectively, the radial arm water maze (RAWM), the hole board (HB) arena and the elevated plus-maze (EPM). We also analyzed serum corticosterone and thyroid hormone levels at postnatal day (PN) 21. Lactating dams were treated with bromocriptine (BRO, 1mg twice a day, inhibiting prolactin) or saline from PN19 to 21 (the last 3 days of lactation). BRO offspring had hypercorticosteronemia and hypothyroidism at PN21. In the RAWM, reductions in latency observed in CON rats were initially more accentuated than in BRO ones. By the end of the testing period, latencies became similar between groups. No difference was observed between groups regarding the number of nose-pokes in the HB. In the EPM, BRO rats stayed less time in and had fewer entries into the open-arms than CON ones. This pattern of results indicates that maternal bromocriptine treatment at the end of the lactating period results in poorer memory/learning performance and in higher levels of anxiety-like behavior in the adult offspring, demonstrating that even a relatively short period of malnutrition during development can have long lasting detrimental effects regarding cognition and emotion.
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Affiliation(s)
- Mabel C Fraga
- Laboratório de Fisiologia Endócrina, Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Centro Biomédico, Universidade do Estado do Rio de Janeiro, Brazil
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Nesil T, Kanit L, Collins AC, Pogun S. Individual differences in oral nicotine intake in rats. Neuropharmacology 2011; 61:189-201. [PMID: 21504750 DOI: 10.1016/j.neuropharm.2011.03.027] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2010] [Revised: 03/25/2011] [Accepted: 03/30/2011] [Indexed: 12/23/2022]
Abstract
To study individual differences in nicotine preference and intake, male and female rats were given free access to a choice of oral nicotine (10 or 20 mg/L) or water for 24 h/day for periods of at least six weeks, starting at adolescence or adulthood. A total of 341 rats, were used in four different experiments; weight, nicotine intake and total liquid consumption were recorded weekly. Results show that rats can discriminate nicotine from water, can regulate their intake, and that there are readily detected individual differences in nicotine preference. Ward analyses indicated that the animals could be divided into minimum, median and maximum preferring subgroups in all experiments. The effect of saccharine on nicotine intake was also evaluated; although the addition of saccharine increased total intake, rats drank unsweetened nicotine solutions and those with higher preferences for nicotine, preferred nicotine over water with or without saccharine added. Nicotine reduced weight gain and the effect was more pronounced in females than males. The average nicotine consumption of adolescent rats was higher than adults and nicotine exposure during adolescence reduced nicotine intake in adult rats. About half of the rats which had access to nicotine as adolescents and also as adults had a persistent pattern of consumption; the behavior was very stable in the female minimum preferring groups and a much higher ratio of rats sustained their adolescent behavior as adults. The change in preference was more pronounced when there was an interval between adolescent and adult exposure; female rats showed a more stable behavior than males suggesting a greater role for environmental influences on males. In conclusion, marked individual differences were observed in oral nicotine intake as measured in a continuous access 2-bottle choice test. Age and sex of the subjects and previous exposure to nicotine are significant factors which affect preference in rats.
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Affiliation(s)
- Tanseli Nesil
- Center for Brain Research, Ege University, Bornova, 35100 Izmir, Turkey; Institute of Sciences, Biotechnology Dept., Ege University, Bornova, Izmir, Turkey
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Belin D, Berson N, Balado E, Piazza PV, Deroche-Gamonet V. High-novelty-preference rats are predisposed to compulsive cocaine self-administration. Neuropsychopharmacology 2011; 36:569-79. [PMID: 20980989 PMCID: PMC3055686 DOI: 10.1038/npp.2010.188] [Citation(s) in RCA: 188] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Sensation/novelty-seeking is amongst the best markers of cocaine addiction in humans. However, its implication in the vulnerability to cocaine addiction is still a matter of debate, as it is unclear whether this trait precedes or follows the development of addiction. Sensation/novelty-seeking trait has been identified in rats on the basis of either novelty-induced locomotor activity (high-responder (HR) trait) or novelty-induced place preference (high-novelty-preference trait (HNP)). HR and HNP traits have been associated with differential sensitivity to psychostimulants. However, it has recently been demonstrated that HR rats do not develop compulsive cocaine self-administration (SA) after protracted exposure to the drug, thereby suggesting that at least one dimension of sensation/novelty seeking in the rat is dissociable from the vulnerability to switch from controlled to compulsive cocaine SA. We therefore investigated whether HNP, as measured as the propensity to choose a new environment in a free choice procedure, as opposed to novelty-induced locomotor activity, predicts the vulnerability to, and the severity of, addiction-like behavior for cocaine. For this, we identified HR/LR rats and HNP/LNP rats before any exposure to cocaine. After 60 days of cocaine SA, each rat was given an addiction score based on three addiction-like behaviors (persistence of responding when the drug is signaled as not available, high breakpoint under progressive ratio schedule and resistance to punishment) that resemble the clinical features of drug addiction, namely inability to refrain from drug seeking, high motivation for the drug and compulsive drug use despite adverse consequences. We show that, as opposed to HR rats, HNP rats represent a sub-population predisposed to compulsive cocaine intake, displaying higher addiction scores than LNP rats. This study thereby provides new insights into the factors predisposing to cocaine addiction, supporting the hypothesis that addiction is sustained by two vulnerable phenotypes: a 'drug use prone' phenotype such as HR which brings an individual to develop drug use and an 'addiction prone' phenotype, such as HNP, which facilitates the shift from sustained to compulsive drug intake and addiction.
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Affiliation(s)
- David Belin
- University of Bordeaux, Bordeaux Cedex, France.
| | - Nadège Berson
- University of Bordeaux, Bordeaux Cedex, France,INSERM U862, Pathophysiology of Addiction, NeuroCentre Magendie, Bordeaux Cedex, France
| | - Eric Balado
- University of Bordeaux, Bordeaux Cedex, France,INSERM U862, Pathophysiology of Addiction, NeuroCentre Magendie, Bordeaux Cedex, France
| | - Pier Vincenzo Piazza
- University of Bordeaux, Bordeaux Cedex, France,INSERM U862, Pathophysiology of Addiction, NeuroCentre Magendie, Bordeaux Cedex, France
| | - Véronique Deroche-Gamonet
- University of Bordeaux, Bordeaux Cedex, France,INSERM U862, Pathophysiology of Addiction, NeuroCentre Magendie, Bordeaux Cedex, France
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Oliveira-da-Silva A, Manhães AC, Cristina-Rodrigues F, Filgueiras CC, Abreu-Villaça Y. Hippocampal increased cell death and decreased cell density elicited by nicotine and/or ethanol during adolescence are reversed during drug withdrawal. Neuroscience 2010; 167:163-73. [PMID: 20138127 DOI: 10.1016/j.neuroscience.2010.01.060] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Revised: 01/27/2010] [Accepted: 01/28/2010] [Indexed: 01/19/2023]
Abstract
We have recently identified hippocampal cell death and reduced neuronal and glial cells densities during adolescent nicotine and ethanol exposures and outcomes reduced in severity when nicotine and ethanol are co-administered during this developmental period. In the present study, we investigated the effects of adolescent nicotine and/or ethanol withdrawal on the following regions of the hippocampus: Granular layer of the Dentate Gyrus (GrDG), Molecular layer (Mol), CA1, CA2 and CA3. From the 30th to the 45th postnatal day (PN30-PN45), C57BL/6 male and female mice were exposed to nicotine free base (NIC) and/or ethanol (ETOH). Four groups were analyzed: (1) concomitant NIC (50 microg/ml in 2% saccharin to drink) and ETOH (25%, 2 g/kg i.p. injected every other day) exposure; (2) NIC exposure; (3) ETOH exposure; (4) vehicle. We evaluated cell degeneration (TUNEL assay), neuronal and glial densities (optical Disector) and region thicknesses two (PN47) and five (PN50) days post-exposure. On PN47, there were increases in the number of TUNEL+ cells in most hippocampal regions of both ETOH and NIC groups. In the NIC+ETOH group there were less severe effects. These results were paralleled by reductions in neuronal and glial cells densities for all treatment groups. In contrast, on PN50, ethanol and/or nicotine withdrawal were associated with compensatory reductions in TUNEL+ cells in all hippocampal regions. These results were paralleled by a reversal of effects on neuronal and glial densities so that there were no longer differences between groups. There were no effects on region thicknesses. These results suggest that deleterious effects of nicotine and/or ethanol are reversed during prolonged withdrawal.
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Affiliation(s)
- A Oliveira-da-Silva
- Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcântara Gomes, Centro Biomédico, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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40
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41
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Darvas M, Morsch M, Racz I, Ahmadi S, Swandulla D, Zimmer A. Modulation of the Ca2+ conductance of nicotinic acetylcholine receptors by Lypd6. Eur Neuropsychopharmacol 2009; 19:670-81. [PMID: 19403274 PMCID: PMC2716416 DOI: 10.1016/j.euroneuro.2009.03.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2008] [Revised: 03/10/2009] [Accepted: 03/31/2009] [Indexed: 01/14/2023]
Abstract
The agonist binding sensitivity and desensitization kinetics of nicotinic acetylcholine receptors (nAChRs) can be modulated by snake venom neurotoxins and related endogenous small proteins of the uPAR-Ly6 family. Here we identify Lypd6, a distantly related member of the u-PAR/Ly-6 family expressed in neurons as a novel modulator of nAChRs. Lypd6 overexpressed in trigeminal ganglia neurons selectively enhanced the Ca2+-component of nicotine-evoked currents through nAChRs, as evidenced by comparative whole-cell patch clamp recordings and Ca2+-imaging in wildtype and transgenic mice overexpressing Lypd6. In contrast, a knockdown of Lypd6 expression using siRNAs selectively reduced nicotine-evoked Ca2+-currents. Pharmacological experiments revealed that the nAChRs involved in this process are heteromers. Transgenic mice displayed behaviors that were indicative of an enhanced cholinergic tone, such as a higher locomotor arousal, increased prepulse-inhibition and hypoalgesia. These mice overexpressing Lypd6 mice were also more sensitive to the analgesic effects of nicotine. Transgenic mice expressing siRNAs directed against Lypd6 were unable to procreate, thus indicating a vital role for this protein. Taken together, Lypd6 seems to constitute a novel modulator of nAChRs that affects receptor function by selectively increasing Ca2+-influx through this ion channels.
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Affiliation(s)
- Martin Darvas
- Institute of Molecular Psychiatry, University of Bonn, Bonn, Germany
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42
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Ribeiro-Carvalho A, Lima C, Medeiros A, Siqueira N, Filgueiras C, Manhães A, Abreu-Villaça Y. Combined exposure to nicotine and ethanol in adolescent mice: effects on the central cholinergic systems during short and long term withdrawal. Neuroscience 2009; 162:1174-86. [DOI: 10.1016/j.neuroscience.2009.05.032] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2009] [Revised: 05/05/2009] [Accepted: 05/16/2009] [Indexed: 11/29/2022]
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43
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Oliveira-da-Silva A, Vieira FB, Cristina-Rodrigues F, Filgueiras CC, Manhães AC, Abreu-Villaça Y. Increased apoptosis and reduced neuronal and glial densities in the hippocampus due to nicotine and ethanol exposure in adolescent mice. Int J Dev Neurosci 2009; 27:539-48. [PMID: 19576279 DOI: 10.1016/j.ijdevneu.2009.06.009] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2009] [Revised: 06/03/2009] [Accepted: 06/23/2009] [Indexed: 12/11/2022] Open
Abstract
It has been recently shown that nicotine and ethanol interact during adolescence affecting memory/learning and anxiety levels. Considering the role of the hippocampus in both anxiety and memory/learning, we investigated whether adolescent nicotine and/or ethanol administration elicit apoptotic cell death and whether this results in neuronal and/or glial density alterations in the following regions of the hippocampus: granular layer of the dentate gyrus (GrDG), molecular layer (Mol), CA1, CA2 and CA3. From the 30th to the 45th postnatal day, C57BL/6 male and female mice were exposed to nicotine free base (NIC) and/or ethanol (ETOH). Four groups were analyzed: (1) concomitant NIC (50mug/ml in 2% saccharin to drink) and ETOH (25%, 2g/kg i.p. injected every other day) exposure; (2) NIC exposure; (3) ETOH exposure; (4) vehicle. We evaluated cell degeneration (TUNEL assay), neuronal and glial densities (optical disector) and region thicknesses at the end of the period of exposure. Our results demonstrate that ETOH elicited an increase in TUNEL-positive cells relative to the vehicle group in all hippocampal regions. NIC elicited less severe region-dependent effects: the number of TUNEL-positive cells was significantly increased in the Mol and CA1 when compared to the vehicle group. These results were paralleled by reductions in neuronal and glial cells densities, which indicate that both cell types are sensitive to the neurotoxic effects of these drugs. There were no effects on region thicknesses. On the other hand, concomitant NIC and ETOH reduced the adverse effects of the drugs when administered separately. This ability of nicotine and ethanol co-exposure to lessen the adverse effects of nicotine and ethanol may contribute to adolescents co-use and co-abuse of tobacco and alcoholic beverages.
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Affiliation(s)
- Andreia Oliveira-da-Silva
- Laboratório de Neurofisiologia, Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Centro Biomédico, Universidade do Estado do Rio de Janeiro, Av. Prof. Manoel de Abreu 444, 5 andar, Vila Isabel, Rio de Janeiro, RJ 20550-170, Brazil
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Fraga-Marques MC, Moura EG, Claudio-Neto S, Trevenzoli IH, Toste FP, Passos MCF, Lisboa PC, Manhães AC. Neonatal hyperleptinaemia programmes anxiety-like and novelty seeking behaviours but not memory/learning in adult rats. Horm Behav 2009; 55:272-9. [PMID: 19118558 DOI: 10.1016/j.yhbeh.2008.11.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2008] [Revised: 10/28/2008] [Accepted: 11/30/2008] [Indexed: 12/31/2022]
Abstract
Leptin treatment during lactation programmes for leptin resistance at adulthood, evidenced by hyperleptinaemia, hyperphagia and overweight. Since leptin is known to affect stress response, emotional behaviour and memory/learning performance, the objective of the present study was to evaluate whether neonatal hyperleptinaemia programmes anxiety-like and novelty-seeking behaviours as well as memory/learning in adult male rats. During the first 10 days of lactation (from PN1 to PN10), pups were s.c. injected once per day with either 50 microL of saline (SAL) or murine leptin (LEP - 8 microg/100 g of body mass, saline diluted). Serum leptin was assessed at PN10 and at PN150. Two separate experiments were carried out: 1) experiment one: at PN137, 29 SAL and 30 LEP rats were tested in the elevated plus-maze (EPM) and, at PN142, their behaviour was assessed in the hole board (HB) arena; 2) experiment two: at PN140, a different group of rats consisting of 53 SAL and 56 LEP animals were tested in the radial arm water maze (RAWM). Serum leptin concentration was higher in the LEP group at PN10 and at PN150. LEP animals spent significantly less time in the open arms of the EPM. Furthermore, the number of nose-pokes in the HB arena was higher in LEP rats. There were no differences between groups regarding latency to find the hidden platform in the RAWM. Our results suggests that a central mechanism of leptin resistance at adulthood, caused by neonatal hyperleptinaemia, is associated with an increased level of anxiety and also that it intensifies novelty seeking-behaviour.
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Affiliation(s)
- Mabel C Fraga-Marques
- Laboratório de Neurofisiologia, Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Centro Biomédico, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
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45
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Manhães AC, Guthierrez MC, Filgueiras CC, Abreu-Villaça Y. Anxiety-like behavior during nicotine withdrawal predict subsequent nicotine consumption in adolescent C57BL/6 mice. Behav Brain Res 2008; 193:216-24. [DOI: 10.1016/j.bbr.2008.05.018] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2008] [Accepted: 05/28/2008] [Indexed: 11/16/2022]
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Glatt AR, Denton K, Boughter JD. Variation in nicotine consumption in inbred mice is not linked to orosensory ability. Chem Senses 2008; 34:27-35. [PMID: 18775876 DOI: 10.1093/chemse/bjn049] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Genetic studies of nicotine addiction in mice have utilized the oral self-administration model. However, it is unclear if strain differences in nicotine consumption are influenced by variation in bitter taste sensitivity. We measured both nicotine consumption and nicotine brief-access licking behavior in several commonly used inbred strains of mice that were previously shown to differ in nicotine consumption. A/J (A), C57BL/6J (B6), and DBA/2J (D2) mice were given a 2-bottle choice test with a single concentration of nicotine (75 microg/ml; nicotine vs. water). Mice of these strains were also tested with a range of nicotine concentrations (5-400 microg/ml) using a brief-access test, which measures orosensory response and minimizes postingestive effects. Although B6 mice consumed more 75-microg/ml nicotine than A or D2 mice in the 2-bottle test, these strains did not differ in level of aversion to nicotine when tested with the brief-access procedure. Strain differences in orosensory response to nicotine were not found; yet, differences emerged during the 2-bottle tests. This study provides evidence that variation in intake level of nicotine is likely not due to differences in taste or trigeminal sensitivity but likely due to postingestive factors.
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Affiliation(s)
- A Rebecca Glatt
- Department of Anatomy and Neurobiology, University of Tennessee Health Science Center, Memphis, TN 38163, USA
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47
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Ribeiro-Carvalho A, Lima CS, Filgueiras CC, Manhães AC, Abreu-Villaça Y. Nicotine and ethanol interact during adolescence: Effects on the central cholinergic systems. Brain Res 2008; 1232:48-60. [DOI: 10.1016/j.brainres.2008.07.062] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2008] [Revised: 07/14/2008] [Accepted: 07/17/2008] [Indexed: 10/21/2022]
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O'Dell LE. A psychobiological framework of the substrates that mediate nicotine use during adolescence. Neuropharmacology 2008; 56 Suppl 1:263-78. [PMID: 18723034 DOI: 10.1016/j.neuropharm.2008.07.039] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2008] [Revised: 07/22/2008] [Accepted: 07/29/2008] [Indexed: 01/17/2023]
Abstract
Adolescents are especially likely to initiate tobacco use and are more vulnerable to long-term nicotine dependence. A unifying hypothesis is proposed based largely on animals studies that adolescents, as compared to adults, experience enhanced short-term positive and reduced aversive effects of nicotine, as well as less negative effects during nicotine withdrawal. Thus, during adolescence the strong positive effects of nicotine are inadequately balanced by negative effects that contribute to nicotine dependence in adults. This review provides a neural framework to explain developmental differences within the mesolimbic pathway based on the established role of dopamine in addiction. This pathway originates in the ventral tegmental area (VTA) and terminates in the nucleus accumbens (NAcc) where dopamine is increased by nicotine but decreased during withdrawal. During adolescence, excitatory glutamatergic systems that facilitate dopamine are overdeveloped, whereas inhibitory GABAergic systems are underdeveloped. Thus, it is hypothesized that adolescents display enhanced nicotine reward and reduced withdrawal via enhanced excitation and reduced inhibition of VTA cell bodies that release dopamine in the NAcc. Although this framework focuses on adolescents and adults, it may also apply to the understanding of enhanced vulnerability to nicotine in adults that were previously exposed to nicotine during adolescence. The hypothesis presented in this review suggests that the clinical diagnostic criteria developed for nicotine dependence in adults, based primarily on withdrawal, may be inappropriate during adolescence when nicotine withdrawal does not appear to play a major role in nicotine use. Furthermore, treatment strategies involving nicotine replacement may be harmful for adolescents because it may cause enhanced vulnerability to nicotine dependence later in adulthood.
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Affiliation(s)
- Laura E O'Dell
- Department of Psychology, University of Texas at El Paso, 500 W. University Avenue, El Paso, TX 79968, USA.
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Gómez MC, Carrasco MC, Redolat R. Differential sensitivity to the effects of nicotine and bupropion in adolescent and adult male OF1 mice during social interaction tests. Aggress Behav 2008; 34:369-79. [PMID: 18366102 DOI: 10.1002/ab.20255] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Few studies have compared the action of both nicotine (NIC) and bupropion (BUP), an antidepressant used to treat NIC dependence, on social and aggressive behavior at different ages. This study aims to determine whether these drugs produce differential effects in adolescent (postnatal day: 36-37) and adult (postnatal day: 65-66) mice that have been housed individually for 2 weeks in order to induce aggressive behavior. Mice received BUP (40, 20, or 10 mg/kg), NIC (1, 0.5, and 0.25 mg/kg as base), or vehicle earlier to a social interaction test. BUP (40 mg/kg) decreased social investigation and increased nonsocial exploration in both adolescent and adult mice. The same effects were also observed in adult mice administered with a lower dose of the same drug (20 mg/kg). In adolescents, NIC (1 mg/kg) decreased social investigation, but this effect did not reach statistical significance in adults. In conclusion, a differential sensitivity to the effects of NIC or BUP emerged in some of the behavioral categories when the two age groups were compared.
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Affiliation(s)
- M C Gómez
- Departamento de Psicobiología, Facultat de Psicología, Universitat de Valencia, Valencia, Spain
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50
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Nicotine-induced monoamine neurotransmitter changes in the brain of young rats. Brain Res Bull 2008; 76:626-39. [PMID: 18598854 DOI: 10.1016/j.brainresbull.2008.03.017] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2008] [Revised: 03/25/2008] [Accepted: 03/27/2008] [Indexed: 11/23/2022]
Abstract
A number of studies in various species including man indicated a greater risk of drug preference and addictive behavior in young as compared to adults. Such age dependent preference was also found with nicotine. To examine possible mechanisms for this difference in our continuing study of reward mechanisms, we compared nicotine-induced neurotransmitter changes in the brain regions of adult and young Sprague-Dawley rats, assaying the transmitters via microdialysis in conscious freely moving animals. In general, nicotine-induced changes were significantly less in the regions measured in the young. Nicotine-induced effects on dopamine in the dorsal and ventral hippocampus (VH), prefrontal and medial temporal cortex, and superior cerebral peduncle were lower in the young than in adult, the same in the ventral tegmental area (VTA) and lateral septal nucleus (LS), and somewhat higher in the nucleus accumbens shell (NAccS). Norepinephrine levels in the young were lower in all areas except in the VH where they were the same, and serotonin levels were lower except in the VTA and LS where they remained the same, and higher in the NAccS. Age-dependent differences in the metabolites measured were more mixed. We conclude that the greater nicotine preference in young is not paralleled by a greater effect of nicotine on the release of monoamines at least in most of the brain areas assayed. Thus, increases of nicotine reward are not likely due to increases of monoamines in reward and cognitive areas. The small increase of dopamine (DA) and more significant increase of serotonin (5-HT) only in the NAccS are of significance, and would indicate a more significant role of 5-HT than of DA at least in the age difference in nicotine preference. Developmental changes in receptor composition and distribution involving several transmitter systems and other components such as neuropeptides are also likely to play a role.
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