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Prolonged withdrawal following cocaine self-administration increases resistance to punishment in a cocaine binge

Scientific Reports volume 4, Article number: 6876 (2014) | Download Citation

Abstract

Drug addiction is characterized by compulsive drug-taking behaviors and a high propensity to relapse following drug cessation. Drug craving and seeking can increase during a period of abstinence, but this phenomenon is not observed in drug-induced reinstatement models. To investigate the effect of withdrawal on cocaine relapse, rats were exposed to extended-access cocaine self-administration and subjected to either 1 or 30 d of withdrawal. When tested during 12 h unlimited access to cocaine (binge), the duration of the withdrawal did not influence cocaine intake. However, using a histamine punishment procedure that greatly suppresses drug-taking behavior, we demonstrate that longer periods of abstinence from cocaine induce a greater persistence in responding for drug in the face of negative consequences.

Introduction

Substance abuse is a chronic disorder described as: (i) a progression from recreational drug use to compulsive drug-taking behavior; (ii) continued drug use in the face of negative consequences; (iii) difficulty in limiting drug intake; and (iv) a high propensity to relapse following drug cessation1,2,3,4. Relapse is often highest during withdrawal from prolonged access to psychomotor stimulants5. For example, cocaine addiction is characterized by high rates of relapse6 and binge episodes following abstinence7,8. A reported 90% of cocaine addicts relapse after prolonged abstinence9,10. Moreover, addicts continue to use cocaine despite knowledge of having a persistent physical or psychological problem and aversive consequences associated with continued use11, which is a diagnostic criterion for substance dependence disorder according to Fifth Edition of the Diagnostic and Statistical Manual of Mental Disorders12. However, despite intense efforts to understand the behavioral and neurobiological mechanisms underling drug addiction, there are currently no approved treatments for cocaine addiction to reduce incidences of relapse.

In order to identify novel pharmacologic and behavioral interventions to diminish the susceptibility to relapse, which can be triggered by associated cues13, researchers have studied models of reinstatement in laboratory animals14,15,16. In these studies, animals are trained to self-administer drug in the presence of distinct cues (e.g., tone, light), after which extinction is induced by repeated sessions in which responding no longer results in presentation of drug infusions or cue presentations. Responding is “reinstated” after a priming drug injection or presentation of a cue previously paired with drug delivery, which is considered a model of drug-seeking/craving14,16,17,18,19,20,21,22.

Historically, cocaine cessation was considered somewhat benign because of relatively few overt physical symptoms23,24,25. However, cocaine cessation leads to a wide range of psychological and physical symptoms including dysphoria, depression, anxiety, insomnia, changes in appetite, psychomotor retardation, and drug craving26,27,28,29,30,31,32. In the human condition, drug abstinence is often a non-voluntary forced abstinence (e.g., incarceration, in-patient rehabilitation, etc.). In contrast, drug cessation in the reinstatement model is via experimenter-imposed extinction procedures that have a learning component33,34. Thus, it has been argued that animal models of forced abstinence (e.g., withdrawal) are a better model of the human condition35. In preclinical rodent models, cue-induced craving for cocaine increases over periods of forced abstinence/withdrawal as measured by extinction/reinstatement procedures18,36,37,38,39,40,41.

The aim of the present study was to determine whether prolonged periods of forced abstinence/cocaine withdrawal increase drug-seeking and drug-taking behaviors. To answer this, rats were given extended access to cocaine self-administration (SA), which models the “loss of control” observed in humans. Following 1 or 30 d of forced abstinence, animals were then given unlimited access to cocaine in an SA “binge” paradigm42,43,44,45,46,47, which elicits a pattern of SA comparable to that of a “compulsive” drug user44,45,48,49,50,51. Furthermore, the effect of withdrawal on punished cocaine SA was investigated, during which infusions of cocaine were mixed with histamine. Histamine administration models the consequence of protracted cocaine use in humans that is characterized by an aversive, delocalized itching sensation throughout the body52. In the laboratory, intravenously delivered histamine effectively reduces responding for a natural reinforcer53 and drug self-administration in rats54 and non-human primates55,56, presumably by mimicking or enhancing this aversive sensation.

Results

Cocaine SA

A two-factor repeated measures ANOVA with drug (cocaine, saline) and withdrawal period (1 WD, 30 WD) as between-subject factors and time (day of testing) as within-subject factor revealed a main effect of drug (F [1, 72] = 123.771; P < 0.001), and an interaction between time and drug (F [9, 648] = 1.919; P < 0.05) (Fig. 1a), indicating that animals assigned to cocaine groups self-administer significantly more infusions than rats assigned to saline groups, and no significant differences in drug intake occurred in animals assigned to 1 or 30 WD. Animals were further counterbalanced and assigned to cue-induced reinstatement, binge test, or punished SA (Fig. 1b). In order to further control for drug histories, the average number of drug infusions was analyzed over the last 4 d of extended access across the cocaine groups: cue-induced reinstatement, 102.9 ± 9.3 and 111.5 ± 5.2; cocaine binge test, 110.1 ± 110.4 and 110.4 ± 10.3; and punished cocaine SA, 100.6 ± 5.2 and 107.7 ± 9.0, for 1 and 30 WD, respectively. There were no significant differences in drug intake between 1 and 30 WD.

Figure 1: Extended access self-administration (SA).
Figure 1

(a) The number of infusions of cocaine (0.5 mg/kg/inf) or saline self-administered per day across the 10 d testing protocol in animals subsequently assigned to 1 d (1 WD; cocaine n = 33, saline n = 16) or 30 d (30 WD; cocaine n = 32, saline n = 14) of withdrawal. (b) Timeline of behavioral testing for (i) cue-induced reinstatement, (ii) cocaine binge test, or (iii) punished cocaine SA.

Incubation of cocaine seeking

In order to determine changes in drug-seeking following periods of withdrawal, the number of active responses during cue-induced reinstatement was analyzed. A two-factor ANOVA revealed main effects of drug (F [1, 36] = 38.707; P < 0.05) and withdrawal period (F [1, 36] = 7.988; P < 0.05), and an interaction between them (F [1, 36] = 12.655; P < 0.05). After one day of withdrawal, animals with a history of cocaine had significantly more active responses than animals with a history of saline (F [1, 18] = 10. 628; P < 0.05). Similarly, animals with a history of cocaine had significantly more active responses than those with a history of saline after 30 d of withdrawal (F [1, 16] = 25.387; P < 0.05) (Fig. 2). In animals with a history of cocaine, a follow-up one-factor ANOVA revealed a significant difference between withdrawal groups (F [1, 20] = 13.772; P < 0.01), indicating that animals with 30 d of withdrawal had a greater number of active responses compared to their 1 WD counterparts. Active responses did not differ between 1 and 30 WD animals that received saline.

Figure 2: Cue-induced reinstatement.
Figure 2

The number of responses to the active alternative following 1 d (1 WD; cocaine n = 12, saline n = 8) or 30 d (30 WD; cocaine n = 9, saline n = 8) of withdrawal. Data are expressed as the average ± standard error; *P < 0.05 vs. 1 WD, #P < 0.05 vs. saline.

Relapse to cocaine re-exposure (binge)

A two-factor ANOVA revealed a significant main effect of drug on the number of infusions self-administered during a 12-h-binge (F [1, 40] = 92.011; P < 0.001). In animals with a history of cocaine, there was no significant difference between the withdrawal groups in the number of infusions (Fig. 3a) or the cumulative dose of cocaine received (Fig. 3b). In addition, no significant effect of withdrawal period was observed following a history of saline.

Figure 3: Cocaine self-administration binge.
Figure 3

(a) Average number of infusions, (b) cumulative dose, (c) average number of hourly infusions, (d) cumulative hourly dose during the 12-h-binge (e) correlation of prior self-administration and binge cocaine performance after 1 d and (f) 30 d of withdrawal, and (g) number of non-reinforced active responses during the 12-h-binge following 1 d (1 WD; cocaine n = 12, saline n = 8) or 30 d (30 WD; cocaine n = 15, n = 6) of withdrawal. Black bars represent animals self-administering cocaine, white bars represent animals self-administering saline. Data are expressed as the average ± standard error; *P < 0.05 vs. 1 WD.

A mixed, two-factor, repeated measures ANOVA was performed, with drug and withdrawal as between-subject factors and time as the within-subject factor, to examine the pattern of drug intake across the 12-h-binge, revealing main effects of time (F [11, 407] = 2.269; P < 0.05) and drug (F [1, 37] = 91.891; P < 0.001). A follow-up analysis revealed only a main effect of time for animals receiving cocaine (F [11, 275] = 2.850; P < 0.001), indicating that the pattern of SA during the binge did not differ between the 1 and 30 WD groups.

Cumulative dose of cocaine self-administered was analyzed using a two-factor, repeated measures ANOVA, which showed a main effect of time (F [11, 275] = 169.189; P < 0.01), and a time × withdrawal period interaction (F [11, 275] = 1.871; P < 0.05). A follow-up post hoc Bonferroni's multiple comparison test revealed no significant differences between the 1 and 30 WD group at any time during the binge, with similar patterns of self-administered infusions (Fig. 3c) and cumulative dose of cocaine (Fig. 3d).

In order to determine if the amount of drug self-administered during a binge episode was associated with previous drug intake, correlation coefficients between the average numbers of cocaine infusions self-administered during days 8–10 of extended access and during the binge were calculated. There was a significant positive correlation between the number of infusions self-administered during the binge and during extended access in the 1 WD group (r = 0.72; P < 0.05) (Fig. 3e). However, this association was not observed after 30 d of withdrawal (r = 0.479) (Fig. 3f).

Finally, in order to determine changes in drug-seeking persistence following periods of withdrawal, active responses during the time-out periods of the cocaine binge were analyzed by a two-factor ANOVA, revealing a significant main effect of drug on the number of active responses (F [1, 40] = 4.142; P < 0.05). A follow-up one-factor ANOVA revealed that with a history of cocaine, animals in the 30 WD group had significantly more active responses during the time-out period than the 1 WD group (F [1, 26] = 4.502; P < 0.05) (Fig. 3g). Withdrawal time did not influence time-out active responses in animals with a history of saline. There were no significant changes in general arousal following periods of withdrawal, as assessed by the number of inactive responses (data not shown).

Punished cocaine binge

A two-factor ANOVA revealed main effects of punisher (histamine vs. no histamine) (F [1, 40] = 12.826; P < 0.01) and withdrawal period (F [1, 40] = 6.141; P < 0.01). Follow-up one-way ANOVAs revealed that animals self-administered significantly fewer infusions of punished cocaine than unpunished cocaine both after 1 WD (F [1, 20] = 4.502; P < 0.05) and 30 WD (F [1, 22] = 5.907; P < 0.05), indicating that histamine was an effective punisher (data not shown).

In order to determine if withdrawal alters drug-taking in the presence of negative consequences, the number of infusions and cumulative dose of cocaine self-administered during the punished cocaine binge were analyzed. Animals in the 30 WD HIST group self-administered significantly more infusions of the cocaine/histamine cocktail compared to animals in the 1 WD HIST group (F [1, 16] = 4.732; P < 0.05) (Fig. 4a). Animals in the 30 WD HIST group also self-administered a significantly greater cumulative dose of cocaine compared to 1 WD HIST counterparts (F [1, 16] = 4.732; P < 0.05) (Fig. 4b). No differences were observed in active responses during the time-out period (Fig. 4g) or in the total number of inactive responses (data not shown).

Figure 4: Self-administration of punished cocaine.
Figure 4

(a) Average number of punished infusions, (b) cumulative punished cocaine dose, (c) average number of hourly infusions, (d) cumulative hourly dose during the 12-h-binge (e) correlation of prior self-administration and punished cocaine performance after 1 d and (f) 30 d of withdrawal, and (g) number of non-reinforced active responses during the punished cocaine binge following 1 d (1 WD HIST, n = 9) or 30 d (30 WD HIST, n = 8) of withdrawal. Black bars represent animals self-administering cocaine, grey bars represent animals self-administering cocaine/histamine cocktail. Data are expressed as the ± standard error; *P < 0.05 vs. 1 WD HIST.

A mixed, two-factor repeated measures ANOVA revealed main effects of time (F [11, 165] = 4.290; P < 0.05) and withdrawal period (F [1, 15] = 4.747; P < 0.001), and an interaction between the two factors (F [11, 165) = 2.004; P < 0.05) on the number of infusions per hour. A follow-up post hoc Bonferroni's multiple comparison test revealed that rats in the 30 WD HIST group self-administered significantly more infusions at hours 5, 7, and 9 compared to rats in the 1 WD HIST group (Ps < 0.05) (Fig. 4c). There was also a main effect of time (F [11, 165] = 33.622; P < 0.01) and a time × withdrawal period interaction (F [11, 165] = 5.065; P < 0.01) for cumulative dose self-administered. The post hoc analysis revealed that animals in the 30 WD HIST group had a significantly higher cumulative dose of cocaine than those in the 1 WD HIST at hours 7–12 (Fig. 4d).

Correlational analyses revealed a significant positive association between the average number of infusions during days 8–10 of extended access and the number of punished cocaine infusions after 1 WD (r = 0.683; P < 0.05), but not after 30 WD (r = 0.556) (Fig. 4e,f).

Discussion

Longer periods of drug abstinence result in an incubation of cue-induced reinstatement and drug-seeking consistent with findings reported by Grimm et al.37. However, there is no such increase in drug-taking when cocaine was readily available following longer withdrawal periods. This discrepancy may be due to the fact that these tests measure two different types of drug-related behaviors. Cue-induced reinstatement measures drug-seeking, as responses do not result in drug procurement, whereas actual drug-taking is measured in a cocaine binge.

Intriguingly, animals that underwent 30 d of withdrawal made more active responses during the time-out period when drug was unavailable, which is consistent with the incubation effect observed in cue-induced reinstatement. This is a model of compulsive responding57,58,59, which is considered an addiction-like criterion in the rat, and is analogous to the difficulty in stopping drug use or limiting drug intake in humans. These data suggest that although withdrawal does not influence binge intake, it may increase compulsive drug-seeking behaviors during periods of drug unavailability. The use of more sophisticated animal models that simultaneously examine drug-taking and drug-seeking components of relapse using a between-session progressive ratio cocaine SA procedure60 may be able to more carefully dissect their individual roles following periods of drug abstinence.

The fact that drug intake remained unchanged after 30 d of withdrawal demonstrates the stability of the learned associations that occur during drug SA, compared to other forms of operant learning which may decay in performance as early as 72 h after the last training session61. This stability is remarkable, given that extended access to cocaine SA produces significant cognitive deficits and impairments in working memory that can persist for at least one month62,63,64,65. Such cognitive impairments have also been observed in humans after two weeks of abstinence66.

One of the hallmarks of cocaine addiction is the regular, continued use of drug despite negative consequences (e.g., health complications, risk of incarceration, etc.). The results of this study demonstrate that a prolonged withdrawal increases the amount of punished cocaine that is self-administered. These findings are consistent with previous reports showing that motivation, as measured by progressive ratio, was increased following withdrawal, though, this may be dependent on withdrawal and drug histories67. Importantly, these data suggest that negative and aversive consequences are less effective for preventing drug-taking following long periods of abstinence. However, this may be dependent on the timing in which the punishment is administered, as Barnea-Ygael et al. found that increasing withdrawal periods attenuated drug-seeking relapse behaviors following exposure to a conflict SA model in which punishment was administered prior to withdrawal68.

Interestingly, cocaine intake was only positively associated with binge intake following a short withdrawal period, suggesting that drug history is not effective in predicting propensity of relapse following longer abstinence periods. Weiss et al. also reported that the severity of cocaine dependence in patients diagnosed with cocaine addiction was a poor predictor of relapse in a three-month follow-up after hospitalization48.

The increase in cocaine seeking that was observed after prolonged withdrawal combined with access to cocaine has grave implications for the human condition. These data suggest that despite averse consequences, the potential to relapse is unaffected by withdrawal. Indeed, lifelong behavioral and neuronal plasticity occurs following drug exposure69,70,71,72, which is thought to drive the cycle of abstinence and relapse that is a hallmark of drug addiction.

Few studies have measured the time-course of drug craving in a naturalistic setting, and clinical studies have contradictory reports across periods of withdrawal. Some studies report that craving for cocaine time-dependently increases over periods of forced abstinence/withdrawal7,26, whereas others report decreases in craving over 28 d73. Furthermore, wide ranging individual differences in drug craving across time have also been reported74. A universal limitation of these human studies is that drug craving is measured in an environment different from the environment where drug-taking occurs, emphasizing the importance of the use of realistic animal models.

In an effort to translate animal models of drug-seeking, drug-taking and relapse into therapeutic interventions, in future studies it will be critical that we use such models to elucidate a full and thorough understanding of the neurobiology that mediates these behaviors. For example, there are several reports that investigate neuronal adaptions as key mediators of the addicted state and relapse, including alterations of glutamatergic synapse function and composition75,76,77,78,79, neurotrophic factors36 and structural plasticity80. Furthermore, it is essential to profile the transcriptional and epigenetic alterations that may mediate our behavioral findings. For example, withdrawal from cocaine has also been linked to gene priming or desensitization resulting from functional changes in the chromatin state around individual genes81,82. These changes in the transcriptional and epigenetic landscape following chronic cocaine provide a plausible mechanism by which relapse occurs despite long periods of abstinence83. Finally, although the data presented here are restricted to cocaine, it is critical to understand whether the stability of drug consumption and resistance to negative consequences occur following exposure to other drugs of abuse, such as opiates, nicotine, and alcohol.

Our results demonstrate that withdrawal from cocaine alters aspects of future susceptibility to relapse in a cocaine binge. Although binge drug-taking remained stable, there is incubation of compulsive drug-seeking behaviors following prolonged periods of drug withdrawal. Furthermore, prolonged withdrawal decreases the effectiveness of a punisher in a cocaine binge. Broadly, these data suggest more clinical intervention is necessary than simple forced abstinence from the drug to decrease future drug relapse. These findings highlight the need for a deeper and more complete understanding of time-dependent behavioral and neuronal adaptations to provide effective clinical intervention to prevent future drug relapse. These punished and unpunished binge paradigms show face validity to the human condition, as resumption of drug-taking behavior is recorded, unlike traditional reinstatement paradigms. Such binge paradigms provide unique results in measuring true ‘relapse’ following periods of withdrawal. Future studies are needed to further investigate the drug-seeking/drug-taking differences observed in relapse following increasing periods of withdrawal. Targeting and understanding relapse in human addicts will be essential for progressive interventions for cocaine addiction.

Methods

Animals

Male Sprague-Dawley rats (300 g; Harlan Laboratories, Indianapolis, IN, USA) were allowed to acclimate for three days upon arrival to the colony room and housed on a 12 h light-dark cycle with ad libitum access to food and water. Rats were singly housed following surgery and for the duration of the experiment in order to protect the catheter/harness assembly. Testing took place seven days/wk during the rats' dark phase of the light-dark cycle. This study and all experimental protocols were approved and the methods were carried out in accordance within the guidelines of the Institutional Animal Care and Use Committee of the State University of New York at Buffalo.

Self-administration test chambers

The experimental chambers have been described elsewhere84. Briefly, 16 standard test chambers (MED Associates, Inc., St. Albans, VT, USA) were equipped with two snout-poke holes that were monitored with infrared detectors. Two stimulus lights were mounted above the snout-poke holes, and a houselight was mounted in the middle of the back wall of the test chamber. All test chambers were housed in sound-attenuating chambers. Test chambers were computer controlled through a MED Associates interface with a temporal resolution of 0.01 s.

Drugs

Solutions of (−)-cocaine hydrochloride (NIDA drug supply program) dissolved in sterile 0.9% saline were prepared on a weekly basis (acquisition, 4.5 mg/mL; extended access, 1.7 mg/mL; cocaine binge, 1.0 mg/mL). Pump durations were adjusted according to body weight on a daily basis in order to deliver the correct dose of drug (acquisition, 1.0 mg/kg/inf; extended access, 0.5 mg/kg/inf; cocaine binge, 0.3 mg/kg/inf). During the punished cocaine binge, a cocaine (1.0 mg/mL)/histamine (13.4 mg/mL) cocktail was used (cocaine, 0.3 mg/kg/inf; histamine, 4.0 mg/kg/inf).

Jugular catheterization and patency test

Rats were implanted with chronic indwelling jugular catheters and allowed seven days to recover following surgery as previously described60,85. Catheters were flushed daily with 0.2 mL of a heparinized saline solution (50 IU/mL) with enrofloxacin (4 mg/mL) to preserve patency. Tests of patency occurred once per week during which the behavioral response to an infusion of ketamine hydrochloride (0.5 mg/kg in 0.05 mL saline; iv) was observed. Loss of muscle tone and righting reflexes served as behavioral indicators of patency. Only rats with patent catheters were used in data analyses.

Acquisition of SA

One week after jugular catheter surgery, rats were trained to self-administer cocaine or saline. Responses to the active snout-poke hole initially resulted in infusions followed by a 30 s time-out period using a fixed ratio (FR)1 schedule of reinforcement, which was increased daily to an FR5 schedule. Following each session, catheters were flushed and rats were returned to the colony room. The criterion for acquisition of cocaine SA was an average of ten infusions per day during the last three days of the acquisition period.

Extended-access SA

Following SA acquisition, rats were exposed to ten days of extended access. During this time, rats were allowed 6-h-access to cocaine (n = 89) or saline (n = 30) according to an FR5 schedule of reinforcement. Following each session, catheters were flushed and rats were returned to the colony room. Only rats that reached criterion of acquisition and maintained catheter patency were used in successive phases of the experiment. Failure to achieve acquisition or respond for cocaine resulted in the removal of the animal from the remainder of the study.

Withdrawal

Following extended access SA, rats were counterbalanced according to SA performance and assigned to receive either 1 or 30 d of withdrawal (1 WD and 30 WD, respectively). During the withdrawal periods, rats were returned to the colony room, flushed once per day, and otherwise left undisturbed in their home cages. Following cocaine SA, rats were then assigned to groups that participated in cue-induced reinstatement, cocaine re-exposure (binge) or punished cocaine responding (histamine).

Cue-induced reinstatement

Following withdrawal, 1 WD (cocaine, n = 12; saline, n = 8) and 30 WD (cocaine, n = 9; saline, n = 8) rats were first exposed to multiple within-session extinction sessions, during which the chambers were dark and responses were recorded but resulted in no programmed consequences37. Sessions were 1 h in duration, separated by 5 min, and were continued until responding levels were equivalent to saline (8–10 sessions). On the subsequent day, animals were returned to their test chamber and given a 1-h-test of cue-induced reinstatement during which active responses produced cues previously paired with drug delivery.

Binge test

Following the assigned withdrawal period, rats were tested during a single 12-h-period during which responses to the active snout-poke hole resulted in infusions according to an FR5 schedule of reinforcement (1 WD: cocaine, n = 12; saline, n = 8; and 30 WD: cocaine, n = 15; saline, n = 6).

Punished SA

Following withdrawal, rats were tested during a single 12-h-period during which responses to the active snout-poke hole resulted in infusions of cocaine mixed with histamine according to an FR5 schedule of reinforcement (1 WD HIST, n = 9; 30 WD HIST, n = 8).

Data analysis

Primary dependent measures were: (i) number of infusions self-administered during extended access; (ii) number of active responses emitted during a test of cue-induced reinstatement; (iii) number of infusions self-administered during cocaine binge; (iv) cumulative cocaine dose (mg/kg); (v) number of active responses emitted during the time-out period of the binge; and (vi) number of inactive responses during the binge. Performance during the binge was analyzed using a two-factor within-subject Analysis of Variance (ANOVA) with the between-session variable as drug group (cocaine, saline) and the within-subject variable as time. One-factor ANOVAs were used to identify sources of significant interactions.

To compare hourly responding during the binge, a three-factor mixed ANOVA was used with drug (saline, cocaine) and withdrawal period (1, 30 WD) as between-subject factors, and time (h) as a within-subject factor. Follow-up two-way between-subject ANOVAs were performed on the hourly data with drug and withdrawal period as the two factors.

Pearson correlation coefficients were determined between the average number of infusions self-administered on days 8–10 of extended access and during the cocaine binge. All data were analyzed using SPSS software, and are represented as the mean ± standard error, with P < 0.05 indicating significance.

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Acknowledgements

This work was supported by R01DA037257 awarded to D.M.D. and NIAAA T-32-AA007583. We would like to thank Drs. Karen Dietz, Paul Meyer, and Fraser Sim for their insightful comments on this manuscript. The cocaine tested in these experiments was gifted by NIDA.

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Author notes

    • Amy M. Gancarz-Kausch
    •  & Danielle N. Adank

    These authors contributed equally to this work.

Affiliations

  1. Department of Pharmacology & Toxicology; Research Institute on Addictions, Program of Neuroscience, University at Buffalo, Buffalo New York 14214, USA

    • Amy M. Gancarz-Kausch
    • , Danielle N. Adank
    •  & David M. Dietz

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Contributions

A.M.G.-K. and D.A. performed and collected all data for Figures 1–4. A.M.G.-K. analyzed and prepared all figures. A.M.G.-K. and D.M.D. wrote the main text of the manuscript. All the authors have read and approved the final version of the manuscript.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to David M. Dietz.

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https://doi.org/10.1038/srep06876

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