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Current Addiction Reports

, Volume 2, Issue 4, pp 293–301 | Cite as

Comorbidity Between Psychiatric Diseases and Alcohol Use Disorders: Impact of Adolescent Alcohol Consumption

  • Jérôme Jeanblanc
Dual Diagnosis (RA Chambers, Section Editor)
Part of the following topical collections:
  1. Topical Collection on Dual Diagnosis

Abstract

Patients suffering from psychiatric disorders such as schizophrenia and bipolar disorders often suffer from alcohol abuse or dependence. Conversely, most alcohol-dependent patients suffer from other psychiatric disorders including depressive or anxiety disorders, with increased risk of suicide ideation and attempts. Adolescence is a crucial period of brain maturation but also of vulnerability to alcohol use disorders and other psychiatric diseases. While global alcohol consumption is decreasing in numerous Western countries, adolescent drinking is increasing with specific patterns of drinking called “binge drinking” leading to massive intoxication in a short period of time. Clinical and preclinical studies investigating the relationship between adolescent alcohol consumption and subsequent psychiatric disorders in patients or in animal models of psychiatric disorders will be described here and discussed.

Keywords

Alcohol Adolescence Mental illness Adulthood Comorbidity 

Introduction

Alcohol use disorders (AUDs), including alcohol abuse and alcohol dependence, are progressive mental disorders with high prevalence in the general population. The World Health Organization revealed that more than 76 million people worldwide have AUDs among the 2 billion consuming alcohol [1]. AUDs are responsible for 5 million deaths per year [2]. Although the prevalence of AUDs is variable across studies and countries, many populations show lifetime prevalence for AUDs of around 10 %. For example, the NCS-R showed a lifetime prevalence for alcohol abuse at around 13 % and for alcohol dependence at about 5 % [3]. Similarly, the National Epidemiologic Survey on Alcohol and Related Conditions (NESARC) reported a lifetime prevalence of around 18 % for alcohol abuse and 12 % for alcohol dependence [4].

AUDs also produce for a significant economic burden on society. The direct and indirect costs of AUDs reach more than 2 % of gross domestic product in high- and middle-income countries [5]. Despite this impact, AUDs have the widest treatment gap among other psychiatric disorders with 78 % of patients effected remaining untreated [6]. Furthermore, patients suffering from AUDs show high rates of relapse despite treatment: 38 % of patients in treatment will relapse within 3 years after achieving abstinence [7].

Interestingly, another particularity of AUD patients is that 50–70 % of them will suffer during their life from a comorbid psychiatric disorder [8], where the term “comorbidity” describes the simultaneous co-occurrence of two different behavioral health diagnoses in the same individual. Here, we will focus on the co-occurrence of any non-substance use psychiatric disorder related to alcohol dependence and vice versa. The relationship between these two disease entities has been understood in various ways that have differential implications for prevention and treatment:
  1. 1.

    Both disorders are totally independent and can/should be treated separately

     
  2. 2.

    Psychiatric disorders are the consequences of alcohol use

     
  3. 3.
    AUD’s are the consequence of psychiatric disorders:
    1. (a)

      Because mentally ill people use ethanol (ETOH) to self-medicate

       
    2. (b)

      Because mental illness worsens vulnerability to ETOH addiction

       
     
  4. 4.

    Both AUDs and mental illnesses share similar psychobiologic underlying mechanisms (e.g., they are actually one disease with two components)

     

In our perspective, the most probable explanations are, first, the self-medication hypothesis but with serious limitations and, second, the fact that AUDs might be another symptom of an existing psychiatric disorder. The self-medication hypothesis can explain for example the use of alcohol acutely to alleviate anxiety (thanks to its anxiolytic properties); however, chronic alcohol intake will have opposite effects and worsen the disease. In addition there is no correlation between the class of drug used and the symptoms that they are supposed to treat (psychostimulant during psychotic episode in schizophrenia, or use of heroin or cannabis during depressive episodes).

The prognosis for comorbid patients is more negative compared with that for non-comorbid patients. The co-occurrence of alcohol (or drug) dependence with other psychiatric disorders worsens psychiatric symptoms, increases their frequency, increases the number of days of hospitalization, and reduces life expectancy [9, 10, 11, 12]. A better understanding of such comorbidity is therefore a pressing need that must be met to provide better care of patients and improved outcomes.

Adolescence is a window of vulnerability not only for onset of mental illness but also for the onset of risky behaviors and pursuit of new experiences including the use of alcohol and nicotine. The aim of this review is to compile evidence investigating a potential role for early alcohol exposure on the course of mental illnesses in alcohol dependent patients and in animal models of alcohol addiction.

Comorbid Psychiatric Disorders in Alcohol-Dependent Patients

Depressive Disorders

Depressive disorders are mood disorders characterized by sadness, despair, lack of desire to live, social withdrawal, loss of motivation, and, in severe cases, suicidal thinking and action. Depressive disorders are classified in the Diagnostic and Statistical Manual of Mental Disorders (DSM5) as disruptive mood dysregulation disorder (for children older than 8 years old and up to 18), premenstrual dysphoric disorders, and persistent depressive disorder (the former dysthymia and major depressive disorders). Major depressive disorders occur in about 17 % of the general population [13] but, in alcohol-dependent patients, are more prevalent (e.g., ranging from 32 % [8] to more than 42 % [14]). As previously mentioned, the relationship between depression and AUDs may be quite complex and bidirectional. This relationship may also be differentially expressed or modulated by gender [8] and the poorer outcome observed might be due to their lower sensitivity to antidepressant treatment [15].

Anxiety

Anxiety is a normal reaction to stress that can often be adaptive in everyday life. However, in some people, anxiety becomes disproportionate and debilitating, producing loss of social, family, and professional functions. Anxiety disorders are among the most common types of mental disorders (or symptoms of mental disorders) including several well-characterized clinical entities such as panic disorder, social phobia, specific phobias, obsessive-compulsive disorder, and posttraumatic stress disorder. Anxiety disorders have a higher lifetime prevalence in women (30.5 %) as compared to men (19.2 %) [16]. In regards to the comorbidity of anxiety disorders with AUDs, a recent meta-analysis revealed a strong association between any anxiety disorder and both alcohol abuse (odds ratio of 1.636) and alcohol dependence (odds ratio of 2.532) [17]. Among the different types of anxiety disorders, social anxiety has been relatively well studied. Results obtained from the National Co-morbidity Study indicate lifetime prevalence of alcohol dependence about 24 % in patients with social anxiety disorders (10 % more than patients without social anxiety disorders). Grant and colleagues found that 13 % of patients suffering from social anxiety disorder within the last year, and more than 48 % with lifetime social anxiety disorders met criterion for AUDs [18]. Globally, the different studies revealed that patients with social anxiety disorders have between two and three times more risk to develop AUDs in their life than persons without social anxiety disorders (see [19] for a review) and “coping” often being cited as the main motive to consume alcohol [20]. On the other hand, patients with AUDs multiply by 10 their risk to develop social anxiety disorders as compared to persons without AUDs [8]. Anxiety disorders can also appear in alcohol-dependent patients during specific periods of withdrawal [21, 22] in which patients cite that relapse provides relief from these anxious symptoms thanks to the anxiolytic properties of alcohol. Posttraumatic stress disorders (PTSDs) that may appear after life-threatening events (war, car accident, sexual aggression) have also been extensively investigated in the past 15 years. Between 3 and 7 % [3, 23] of the general population will develop PTSD during their life. A recent systematic review of the literature indicates that among patients with PTSD, 10 to 61 % suffer from comorbid alcohol misuse [24]. An imagery study demonstrated that AUDs enhance the structural alterations of the hippocampus induced by PTSD [25].

Suicide

Suicide rates vary between countries from around 3–4 per 100,000 persons in South Africa to more than 30 per 100,000 persons in South Korea with a majority of countries having a suicidal rate around 10 to 15 per 100,000 persons [26]. This variability can be explained by cultural reasons (e.g., the stigma of the suicidal attempt for the family) or by criterion used to certify the cause of death. Suicide is three to four times more prevalent in men than in women, and suicide may be encountered at any age. However, two peaks of prevalence emerge: during adolescence and in elderly people (>60 years old). Although suicide happens across demographic groups without “class distinction,” suicide levels are highest among retirees, unemployed, divorced, urban people, and people living alone. A recent South Korean study revealed significant associations between Alcohol Use Disorders Identification Test (AUDIT) scores of 20 or over and suicidal ideation (odds ratio of 1.68) and suicidal attempts (odds ratio of 2.64) [27]. These authors also found that high frequency of drinking per week (more than four times) is significantly associated with suicide attempts (odds ratio of 2.85). Darvishi and colleagues [28] performed a meta-analysis of scientific publications focusing on the relationship between alcohol consumption and risk of suicide (ideation, attempt, and completed suicide). In this meta-analysis, the authors included a total of 31 studies with more than 400,000 subjects and found that AUDs were significantly associated with suicidal ideation (odds ratio of 1.86), suicide attempts (odds ratio of 3.13), and completed suicide (odds ratio of 2.59). The relationship between suicide and AUDs is complex since patients suffering from AUDs can secondarily develop major depressive disorders which can lead to suicide attempts, whereas patients with depression may sometimes claim that alcohol relieves their depressive symptoms.

Bipolar Disorder

Formerly called manic-depressive illness, bipolar disorder is part of the mood disorder spectrum. In its typical form, the patient experiences cycles between two different phases—the manic phase and the depressive phase—deviating from the normal (euthymic) state in various episodic patterns. During the manic phase, the patient is euphoric, hyperactive, and disinhibited and will suddenly have multiple projects to conduct in parallel. The depressive phase is characterized by sadness and lack of motivation and, in the most severe cases, similar to “pure” depressive disorders, leading to suicide ideation and/or attempts. Numerous studies found high rates of comorbid AUDs in patients suffering from bipolar disorders. The Epidemiological Catchment Area Study, conducted in the USA, found that bipolar patients have a 46 % lifetime prevalence of AUDs [29]. The National Comorbidity Study, also conducted in the USA, revealed that patients with a diagnosis of alcohol dependence during their life have higher risk of developing comorbid mania [8]. More recently, Merikangas et al. [30] reported from more than 9000 patients included in the National Comorbidity Survey Replication a 39.1 and 23.2 % lifetime prevalence of alcohol abuse and alcohol dependence, respectively. Interestingly, manic symptoms in general as well as bipolar type II disorders (mild manias, with intervening depressions) are strong predictors of lifetime alcohol abuse and alcohol dependence [31]. In Brazil, the prevalence rates of AUDs in patients diagnosed for bipolar disorders are similar to the previous studies and around 23 % [32].

Schizophrenia

Schizophrenia is characterized by a series of symptoms classified as positive (hallucinations, delusion thought disorders), negative (social withdrawal, loss of motivation, neglect of personal hygiene), and cognitive symptoms (attention and memory deficits). About 1 % of the total population suffers from schizophrenia, occurring in both men and women equally. Substance use disorders (SUDs) are well described in patients with schizophrenia, and studies show that almost all patients with schizophrenia have at least one addiction (85 % to nicotine [33], 15 to 50 % to cocaine [34], 12 to 42 % to cannabis [34]. Concerning AUDs, the prevalence reaches more than 40 % [35] to even 77 % in one study [36]. However, a recent Norwegian study [37] based on a national registry covering all patients receiving public specialist health care in Norway (Norwegian Patients Register) found lower prevalence for schizophrenia (0.34 %) and for comorbid AUDs in patients with schizophrenia (4.6 %). The authors raised some limitations to their study including the fact that “the study only included people who had been in contact with specialist health care services during 5 years” and that “diagnoses of psychotic disorders and SUD in the NPR have not yet been subjected to formal validity testing.” It is noteworthy that a large proportion of patients with schizophrenia already met criteria for AUDs according to the DSM-IV at the time of their first psychotic episode [38, 39] suggesting an early onset for AUDs in patients with schizophrenia.

Alcohol Consumption in Adolescence

Adolescence is a transition period between an infantile dependence and a more independent position. This period is marked by significant biological, neuro-anatomical, psychological, social, and behavioral changes [40]. The WHO defines an adolescent as a teenager aged between 10 and 19 years. Adolescence is triggered by the onset of puberty and theoretically ends after the consolidation of the final stages of physical development (17–21 years on average). However, periadolescent brain modifications continue until the age of 25 years old [41].

Global alcohol consumption has decreased over the two last decades in many countries (e.g., Italy, France, Japan, and other Southern European countries [42]). However, alcohol consumption among adolescents is increasing in almost all countries. The European Survey Health Behaviour in School-aged Children (HBSC) indicates that adolescents enrolled in middle school (11 to 16 years old mainly) have high levels of testing alcoholic drinks. Indeed, more than half of students in the sixth grade have already tasted an alcoholic drink (59.3 %) and 83.2 % have by ninth grade [43]. Also, according to the results of this survey, 10 % of male students and 6 % of female students reported drinking alcohol at least once a week at the age of 13. This proportion reaches 25 % (for the males) and 13 % (for the females) at the age of 15. Thus, during middle school, the most frequently experienced psychoactive substance is alcohol, well ahead of tobacco and cannabis. Over the time spent of middle school, one out of six European students will experience at least one alcohol intoxication with levels multiplied by 5 between the sixth and the ninth grade (6.8 to 34 %) [43, 44]. A similar phenomenon is observed in the USA with the highest prevalence of alcohol dependence among 18 to 20 year olds [45]. The National Survey on Drug Use and Health indicates that from age of 12 to age of 21, the prevalence of alcohol use increases from about 10 % to more than 85 % [46]. This makes alcohol, similar to the European context, the drug also most used by American teenagers, way above tobacco and marijuana [47].

All these data indicate that adolescents consume high levels of alcohol. But, in addition to this, the pattern of drinking itself is different from that of adult consumers. Indeed adolescents drink less frequently but more heavily at each episode of consumption. This phenomenon, called binge drinking, is characterized by ingesting a large amount of alcohol in a short period of time, to rapidly get drunk. Particularly present in adolescents and young adults, this mode of consumption is precisely defined by the National Institute on Alcohol Abuse and Alcoholism [48] as consumption within 2 h of a large amount of alcohol corresponding to 60 g of pure alcohol (six glasses) for women and 70 g (seven glasses) for men which leads to blood alcohol levels greater or equal to 0.8 g/l. This mode of consumption leading to repeated drunkenness is particularly harmful at both cognitive [49, 50] and neuroanatomical levels (for a review, see [51]).

The particular vulnerability of adolescents toward alcohol can be explained by the late maturation of specific brain regions such as the prefrontal cortex involved in inhibitory control of actions and in evaluation of action consequences. This delayed maturation of frontal brain regions has been shown to be associated with activation of the amygdala involved in emotions, conditioning, and fear [52]. Normal adolescent development reverses this balance to restore the highest activity of the frontal cortical regions with a decrease in the amygdala [53]. However, early alcohol consumption may disrupt this process of maturation as it has been demonstrated that adolescents who misuse alcohol show poor performance in inhibition tasks and mental flexibility [54]. Another study compared the neuropsychological performance of four different groups of subjects: young binge drinkers, young moderate drinkers, abstinent young adults, and healthy elderly subjects (mean age of 69 years old). The authors found that binge drinkers have poorer performance than moderate drinkers or abstinent subjects, but comparable performances to older people [49].

Late Psychiatric Consequences of Adolescent Alcohol Consumption

Except for subsequent alcohol dependence induced by an early alcohol initiation (which is not the scope of this review), very few studies have investigated the impact of adolescent exposure to alcohol on other adult psychiatric disorders commonly found to be comorbid with AUDs.

Brook and colleagues [55] found in a longitudinal study that alcohol consumption during adolescence increases the odds for adult diagnosis of anxiety disorders (odds ratio of 1.30) and antisocial personality disorders (odds ratio of 1.36). McCambridge and colleagues performed a systematic review of studies investigating the late consequences of alcohol use during adolescence. Thirty-five reports were generated from 10 different cohorts and 19 other reports from individual cohorts [56]. From these 54 reports, only 5 investigated the association between early alcohol consumption and late consequences on psychiatric disorders other than AUDs. These five studies specifically focused on depressive disorders, anxiety disorders, and suicidal ideation/attempts. Taken together, most of the studies demonstrated a strong association between alcohol consumption during adolescence with adult (or young adult) diagnoses of depression or anxiety disorders [57, 58, 59, 60]. However, two studies did not find a link between early/adolescent alcohol consumption and depressive disorders or anxiety disorders later on [59, 61]. Rohde et al. found that adolescents with alcohol problems (defined as “one or two symptoms of alcohol dependence but no AUD diagnosis” established [58]) exhibit higher risk for antisocial personality disorders. In regards with suicidal ideation or attempts, alcohol does not seem to have any effects at adulthood (age between 21 and 25) in distinction to its effect during late adolescence (age between 16 and 21) [59]. Thus, very few human studies have investigated the role of adolescent alcohol consumption on late psychiatric disorders other than alcohol abuse and dependence. Moreover, the “late” consequences are often evaluated in young adults, only a few years after the end of adolescence and rarely after 35–40 years old. Furthermore, the question of whether certain severe psychiatric disorders such as schizophrenia and bipolar disorders may be contributed to by heavy adolescent drinking has been almost completely unexplored in human studies.

What do Animal Models Teach Us About the Impact of Alcohol Exposure During Adolescence?

Obviously, some human psychiatric conditions described in this review cannot be studied using animal models, such as suicide ideation/attempts for example. Nonetheless, numerous animal models exist for psychiatric diseases (for a review, see [62]) which can be highly informative to clinical context when their strengths and weaknesses are carefully considered [63]. However, similar to human studies, only a few animal models of psychiatric disorders have been the subject of investigation aiming at identifying the impact of adolescence exposure to alcohol on subsequent occurrence of psychiatric symptoms or syndromes.

Depression

Over the last 5 years, insufficient data has been published to make any conclusions on the potential role for alcohol exposure during adolescence on adult depression-like behavior. However, Ribiero-Carvalhi and his colleagues [64] used a protocol of intra-peritoneal injections of alcohol (2 g/kg, 25 % ethanol solution) every other day between the postnatal days 30 and 45 corresponding to adolescence in mice [65]. Depression-like behaviors were assessed with the Forced Swim Test and with a sucrose preference test. At adulthood, only a weak impact of early alcohol exposure in the forced Swim test was found in female mice, and no effect at all in both male and female mice in the sucrose preference test. The authors used the C57BL/6 strain of mice which is known to be an alcohol-preferring strain meaning that the mice spontaneously consume high levels of alcohol [66], and this specific phenotype toward alcohol might have interfered with specific onset on depression-like behavior. In addition, C57BL/6 mice exhibit already high level of immobility in the Forced Swim Test [67] as compared to other strains of mice inducing a potential ceiling effect.

Anxiety

As in humans, the relationship between alcohol consumption and anxiety has been more widely studied in rodents, but interestingly with diverse findings. Rats selectively bred for their alcohol-preferring phenotype can show either high [68] or low anxiety levels [69]. Conversely, two selected strains of rats for high levels of anxiety did not show increased levels of alcohol consumption [70]. As mentioned for humans, anxiety can be induced by alcohol withdrawal, and Zhang and colleagues have demonstrated in adult rats that acute and repeated alcohol administration induces anxiety-like behavior [71].

Recent studies have demonstrated a link between adolescent alcohol administration and subsequent anxiety-like behavior in adulthood. Using a binge drinking exposure paradigm during adolescence (postnatal days 28 to 53), Meija-Toiber and colleagues [72] studied anxiety-like behavior at adulthood (postnatal days 185) in the light-potentiated startle test. It is noteworthy that rats were re-exposed to alcohol following the same 4-day binge drinking procedure just before the anxiety test. The authors found an elevated anxiety level during the withdrawal period in adult rats pre-exposed to alcohol during adolescence. Crews’ group used intra-gastric administration of alcohol (5 g/kg, 20 % ethanol solution) between postnatal days 25 and 55 on a 2-day on/2-day off schedule similar to the one developed by Pascual et al. [73] with intra-peritoneal injections. Alcohol-treated rats exhibited in advanced adulthood (postnatal day 219) higher anxiety measured as the time spent out of the light during a light/dark box test [74]. In another study, Pandey and his colleagues also used the Pascual et al. [73] protocol of intra-peritoneal injections between the age of 28 and 41 days on a 2-day on/2-day off schedule. Alcohol-treated rats displayed at the age of 92 days higher anxiety in the light/dark box and in the elevated plus maze tests. This high level of anxiety was already present during adolescence; thus, these results suggest that alcohol-induced anxiety observed in adolescents persists until adulthood and probably through modification of gene expression thanks to epigenetic mechanisms [75••].

Schizophrenia

A large number of animal models of schizophrenia are available (genetic, pharmacological models, etc.), but in regards to studying comorbid use of substances in mental illness, the neonatal ventral hippocampal lesion (NVHL) model described by Lipska and Weinberger [76] has been the most frequently used. Chambers’ group has largely investigated the adult consumption of drugs of abuse such as cocaine [77, 78], nicotine [79, 80], and also alcohol [81, 82] with this model showing increased consumption of the different drugs of abuse at adulthood. However, our group was the first to investigate the impact of adolescent alcohol exposure on subsequent AUDs in adulthood in the NVHL model of schizophrenia [83]. In this study, we found that moderate alcohol consumption using a 10 % continuous access two-bottle choice paradigm during adolescence (postnatal days 28 to 42) is necessary to observe at adulthood a loss of control over alcohol consumption. This loss of control, found using a 20 % intermittent access protocol, is associated with higher motivation to consume alcohol, resistance to extinction, and higher relapse after protracted abstinence in an operant self-administration paradigm (20 % ethanol solution). These specific phenotypes were long lasting since after more than a month, pre-exposed NVHL rats still exhibited higher levels of ethanol consumption (0.9 g/kg/30 min vs. 0.4 g/kg/30 min for the pre-exposed SHAM rats). None of the behavioral alterations were observed either in control animals pre-exposed to alcohol, or in alcohol-pre-exposed NVHL rats tested in adulthood in terms of sucrose consumption. Further investigations are ongoing in order to assess the impact of these addiction-like phenotypes on schizophrenia-like behaviors.

Decision Making

Decision making is the ability to select the most favorable option for the subject among many at a particular time. This selection is based on several internal and external parameters. Decision making is crucial in everyday life to adapt our behavior to the changing environment. Abnormal decision making may be a key concept to understand behavioral disturbances present in depression [84], anxiety disorders [85], schizophrenia [86, 87], and other mental illnesses [88].

Preclinical studies have demonstrated that adolescent alcohol consumption induces alterations in decision making processes at adulthood. Nasrallah and his colleagues [89] pre-exposed adolescent rats (postnatal days 30 to 49) to alcohol (10 % ethanol geletin) and evaluated the risk-based decision making processes at adulthood (3 months after the end of alcohol exposure) using a probabilistic discounting task. Pre-exposed rats showed significantly higher risky choices than control rats associated with higher dopamine release in the core part of the nucleus accumbens. Moreover, the authors showed altered phasic dopamine release during the choices in pre-exposed rats. On the opposite, no difference of dopamine release was observed when rewards (sucrose pellets) were delivered freely to the animals. These results suggest that alcohol pre-exposure during adolescence modifies decision making in adulthood by altering dopamine-related encoding of the cost during the choice but not the consumption value of the reward. A study from the same group identified a dysregulation of learning processes involved in these decision making alterations induced by early alcohol consumption [90]. Indeed, pre-exposed rats showed fast learning for what the authors called “better-than-expected” rewards but not “worse-than-expected” ones still without altering the perception of the real value of the rewards. Using another alcohol pre-exposure procedure (5 g/kg of 25 % ethanol intra-gastrically in a 2-day on/2-day off pattern), Boutros et al. found similar increased risky choice at adulthood and, within the prelimbic area of the prefrontal cortex, reduced levels of tyrosine hydroxylase, the enzyme responsible for the synthesis of dopamine. Likewise, the authors found reduced levels of choline acetyltransferase in cholinergic nuclei [91•].

Conclusion

AUDs in patients suffering from psychiatric disorders show increased severity and frequency of psychiatric symptoms complicating their care. Numerous studies have demonstrated that adolescent alcohol consumption is strongly associated with higher risk of premature death, and to acquiring AUDs during adulthood. Nonetheless, unlike cannabis use and schizophrenia, alcohol consumption during adolescence does not seem to influence the age-of-onset of major psychiatric disorders exhibited by alcohol-dependent patients. However, despite the scarcity of clinical and preclinical studies investigating the role of early alcohol consumption on adult frequency and severity of psychiatric disorders, it seems clear that alcohol consumption during adolescence is strongly associated to anxiety and depressive disorders at adulthood.

Considering the dramatic brain damages induced by early alcohol consumption observed in clinical and preclinical studies, it is perhaps surprising that a link between adult psychiatric diseases and early adolescent alcohol exposure has not been robustly observed. But, this lack of strong evidence might be due to the small number of studies investigating such a link. McCambridge et al. [56] reviewed 54 reports with only 5 focusing on psychiatric disorders other than alcohol dependence. Moreover, most of these studies focused on only mood disorders. Thus, we can imagine that with an increased number of studies, with specific focus on each psychiatric disorder or endophenotypes of each disease on a long lifespan, we may yet still detect long-lasting behavioral and psychiatric effects of adolescent alcohol consumption.

The small number of preclinical studies has already revealed very interesting information about the behavioral and neurochemical basis underlying the link between AUDs and psychiatric disorders. This suggests the need for greater efforts in examining the development of comorbid AUDs in already existing animal models of psychiatric disorders, despite the added technical complexity that this entails. Employment of cutting-edge techniques such as in vivo fast cyclic voltammetry, optogenetics, or Designer Receptors Exclusively Activated by Designer Drugs (DREADD) techniques to these preclinical models will allow new research and new scientific questions focusing on neurobiological basis of the comorbid use of alcohol in animal models of mental illness.

Nevertheless, in addition to the already demonstrated link between alcohol consumption during adolescence and mood disorders, early alcohol exposure leads to high risk of AUDs. Since AUDs in patients suffering from psychiatric diseases are associated with worse prognosis and poor treatment outcome, prevention against alcohol consumption in adolescents in general but specifically in populations at risk for any of the major psychiatric diseases may be important to improve patients’ care at adulthood.

Comorbid AUDs in patients with mental illness is, sadly, still not enough evaluated as a clinical entity despite its significant prevalence. In most treatment facilities, patients can only be admitted for a psychiatric disorder in a psychiatric facility, or in an addiction treatment center for their addiction issues. Only rarely are patients treated for both diseases at the same time and at the same place. In addition, an effort in training more medical staff to take care of such comorbid patients is necessary to achieve efficient care of this particular population of patients. Pursuing clinical and preclinical research on AUDs comorbid with psychiatric disorders, and achieving these efforts in the context of integrated organization and training structures will be needed to improve the prognosis of patients suffering from both substance use disorders and mental illnesses.

Notes

Compliance with Ethics Guidelines

Conflict of Interest

Jérôme Jeanblanc declares no conflict of interest.

Human and Animal Rights and Informed Consent

This article does not contain any studies with human subjects performed by any of the authors. Animal studies mentioned in this article performed by the authors were performed accordingly to the European community regulations for animal use in research (CEE No 86/609) and were approved by the local ethical committee (Comité Régional d’Ethique en Matière d’Expérimentation Animale de Picardie).

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© Springer International Publishing AG 2015

Authors and Affiliations

  1. 1.Research Group on Alcohol and Pharmacodependences – INSERM ERi24UFR Pharmacie Université de Picardie Jules VerneAmiensFrance
  2. 2.Université de Picardie Jules Verne, Equipe INSERM ERI24, Groupe de Recherche sur l’Alcool et les Pharmacodépendances, GRAPCentre de Recherche Universitaire en Santé (CURS)Amiens Cedex 1France

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