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DOI: 10.1055/a-1027-7055
Circadian Clocks in the Regulation of Neurotransmitter Systems
Abstract
To anticipate and adapt to daily recurring events defined by the earth’s rotation such as light-dark and temperature cycles, most species have developed internal, so-called circadian clocks. These clocks are involved in the regulation of behaviors such as the sleep-wake cycle and the secretion of hormones and neurotransmitters. Disruptions of the circadian system affect cognitive functions and are associated with various diseases that are characterized by altered neurotransmitter signaling. In this review, we summarize the current knowledge about the interplay of the circadian clock and the regulation of psychiatric health and disease.
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Key words
circadian clocks - clock genes - neurotransmitter - psychiatric disorders - attention-deficit hyperactivity disorder (ADHS)The Circadian Clock System
In mammals, the circadian clockwork is comprised of interlocked transcriptional-translational feedback loops (TTLs; [Fig. 1]). In the circadian core TTL, the transcription factors brain and muscle Arntl-like protein 1 (BMAL1/ARNTL) and circadian locomotor output cycles kaput (CLOCK), the latter of which can in some tissues be replaced by neuronal PAS domain protein 2 (NPAS2), bind as heterodimers to E-boxes in the promoters of period1–3 (Per1–3) and cryptochrome1/2 (Cry1/2) to activate their transcription during the day. In the following hours, PER and CRY proteins, in contrast, repress BMAL1:CLOCK-mediated transactivation, which is reinitiated in the following morning after degradation of PER and CRY [1]. This core TTL is stabilized by auxiliary interlocking TTLs ([Fig. 1]). E-boxes can be found in the promoters of many other clock-controlled genes, which are subsequently expressed in a circadian rhythm. It was estimated that over 40% and 80% of all murine and primate protein-encoding genes, respectively, display circadian rhythmic expression in at least 1 tissue [2] [3].
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Light entrainment of the circadian system
Molecular circadian clocks are expressed in every mammalian nucleated cell. For coherent physiological output, these different circadian clocks need to be synchronized with each other and with external time environmental conditions. Therefore, the circadian system is organized in a hierarchical order with a master pacemaker residing in the hypothalamic suprachiasmatic nucleus (SCN) [4]. Intrinsically photosensitive retinal ganglion cells expressing the photopigment melanopsin project via the retino-hypothalamic tract (RHT) to the SCN [5] and by affecting the expression of Per in the SCN synchronize the SCN clock with the external light-dark cycle [6]. Subsequently, the SCN resets central extra-SCN and peripheral clocks through neuronal and humoral signals [7].
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Sleep is clock-controlled
The most prominent circadian behavioral function is the sleep-wake cycle. Confinement of sleep to the night or day in diurnal and nocturnal species, respectively, is controlled directly by the SCN clock. The SCN projects, via the sub-paraventricular zone and the dorsomedial hypothalamus (DMH), to sleep-regulating brain regions such as the ventrolateral preoptic nucleus, the lateral hypothalamus, and the locus coeruleus (LC) [8]. The circadian clock, subsequently, regulates sleep timing, leading to early (larks) and late (owls) chronotypes. Furthermore, clock gene polymorphisms are associated with sleep disorders (e. g., delayed sleep phase disorder) [9] [10] [11]. Besides sleep timing, the SCN clock also affects sleep architecture as, for example, REM sleep predominantly occurs during the nadir of the SCN-controlled core body temperature rhythm [12] [13].
Sleep is an important regulator of synaptic plasticity [14]. According to the “synaptic homeostasis” hypothesis, synaptic strength is downregulated during sleep that facilitates energy saving and refinement of synaptic plasticity, thereby improving cognitive functions [15]. Additionally, genes encoding numerous synaptic components are expressed in a circadian pattern [16]. Long-term potentiation (LTP), a major correlate of synaptic plasticity, displays diurnal alterations and, during the dark period, the clock protein REV-ERBα seems to be critical for NMDAR-dependent synaptic potentiation in the hippocampus [17] [18]. Interestingly, in the hippocampus, the phosphorylation of GSK3β displays a circadian pattern and alterations of GSK3 activity affect both the molecular circadian clock and LTP [19]. Day-night differences in hippocampal LTP vanish in mice carrying a deletion of the receptor of the pineal hormone melatonin, which is accompanied with worse and arrhythmic spatial learning capabilities [20].
Through multi-synaptic control, the SCN clock regulates the expression of the pineal hormone melatonin, which is often referred to as the “sleep hormone” due to its role in timing sleep onset and latency [21]. Melatonin is synthesized and secreted during the night and acts as zeitgeber (i. e., synchronizer) for many peripheral clocks but also provides feedback to the SCN itself [22]. Subsequently, disruptions of the circadian system and sleep disturbances are often interconnected. Sleep and circadian disruptions are often observed in mental disorders, which are associated with altered expression of neurotransmitters. Therefore, circadian regulation of neurotransmitters might play a role in the development and treatment of these disorders.
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Neurotransmitters and the Circadian Clock
Neurotransmitters are endogenous chemicals that are released by neurons, including, for example, glutamate, gamma-aminobutyric acid (GABA), glycine, acetylcholine, dopamine (DA), (nor-)epinephrine, histamine, and serotonin. Circadian regulation of major neurotransmitters of the mammalian central nervous system is discussed below.
DA
Probably the best studied neurotransmitter with regard to circadian regulation is DA, which plays a major role in reward-motivated behavior (reviewed in [23]). In the brain, DA is mainly produced in neurons of the mesolimbic system arising in the ventral tegmental area (VTA) and the substantia nigra (SN) and projecting to the ventral striatum including the nucleus accumbens (NAc), the amygdala, and the prefrontal cortex. Baseline striatal DA of mice and rats displays circadian rhythmicity with higher DA levels during the night [24] [25]. Furthermore, DA biosynthesis, transport, and degradation are controlled by the circadian clock. E-boxes have been identified in the promoters of tyrosine hydroxylase (TH, the rate-limiting enzyme of DA synthesis), DA transporter (DAT), and monoamine oxidase-A (MAO-A, a DA-degrading enzyme), which subsequently display circadian rhythmicity in their expression [26] [27] [28] [29]. Interestingly, also DA signaling itself seems to be under circadian control. Expression of the DA receptors Drd1, Drd2, and Drd3 has been shown to display diurnal rhythmicity in the NAc that is abolished by Npas2 knockdown, whereby Drd3 expression is directly controlled by the clock proteins ROR and REV-ERB [30] [31] [32].
The existence of an endogenous rhythmic clock in the VTA is controversially discussed, but endogenous rhythmic clock gene expression has been shown in the NAc [33] [34] [35]. Still, circadian rhythmicity in the VTA could be induced by indirect projections from the SCN via the lateral hypothalamus, the lateral habenula, the paraventricular thalamic nuclei, or the medial preoptic nucleus ([Fig. 2]; reviewed in [23]).
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Therefore, it is not surprising that several clock gene mutant mice display dopaminergic alterations. Per2 mutant mice show higher basal DA release, lower MAO-A and D1R, and higher D2R expression, which has have been associated with a depression-resistant phenotype of these mice [26]. Rev-Erbα −/− mice show mania-like behavior that is induced by missing inhibition of REV-ERBα onto TH gene expression, thereby leading to a hyperdopaminergic state [36]. Clock-Δ19 mice show increased dopaminergic activity, TH expression and altered striatal D1R and D2R expression. This may explain their bipolar mania-like phenotype that is characterized by disrupted circadian sleep, hyperactivity, lower anxiety, and decreased depression-related behavior [37] [38].
On the contrary, DA affects the circadian system. In primary murine striatal neurons, the expression of Clock and Per1 can be inhibited by D2-class receptor agonists, whereas Per1, Clock, Npas2, and Bmal1 expression can be stimulated by D1-class receptor agonists [39]. DA depletion dampens striatal PER2 expression in vivo, which can be rescued by rhythmic activation of D2R [25]. Interestingly, DA is an important entrainment factor of the pre-natal SCN [40].
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Serotonin
Another monoamine interacting with the circadian system is serotonin (5-hydroxytryptamine, 5-HT), which is also a precursor of melatonin and is involved in the regulation of emotions and mental well-being. The major production sites of 5-HT in the brain are the Raphé nuclei of the brainstem. There, the mRNA of the rate-limiting enzyme of 5-HT synthesis, tryptophan hydroxylase, is rhythmically expressed and, thus, 5-HT is rhythmically secreted. However, this rather seems to be remotely regulated by the SCN via corticoids than by a circadian clock in the Raphé nuclei (reviewed in [41]). Interestingly, 5-HT plays an important role in photic entrainment of the SCN. The 5-HT reuptake transporter and different 5-HT receptors (5-HT1B, 5-HT7, 5-HT2C) are expressed in the SCN and 5-HT is rhythmically released in the SCN by Raphé terminals. This release is highest during the active phase (i. e., during the night and day in nocturnal and diurnal species, respectively) [42]. 5-HT modulates light-induced phase shifts in locomotor activity and 5-HT depletion disrupts circadian rhythmicity in sleep [42] [43]. Selective serotonin reuptake inhibitors (SSRIs), which are commonly used in the treatment of major depression, change circadian rhythmicity. The SSRI fluoxetine induces behavioral phase-advances and alters clock gene expression in the SCN of rats [44]. This may, at least in part, be mediated by the direct projection of the median Raphé nucleus or the indirect projection of the dorsal Raphé nucleus via the intergeniculate leaflet to the SCN. In turn, the SCN projects primarily via the DMH to the Raphé nuclei ([Fig. 2]) (reviewed in [41]). In conclusion, the serotonergic and the circadian system are strongly interconnected.
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Glutamate
Glutamate is the major stimulating neurotransmitter and ubiquitously expressed throughout the brain. The RHT uses glutamate, which is subsequently involved in the relay of light information to the SCN. Several subunits of different glutamate receptors are expressed in the SCN and glutamate antagonists can block light-induced behavioral phase shifts (reviewed in [45]). Interestingly, glutamate is also involved in the endogenous activity of SCN neurons since astrocytes inhibit SCN neurons during the day by regulating extracellular glutamate [46]. Glutamate uptake and the activity of glutamine synthetase, which degrades synaptic glutamate, in the SCN are higher during the day than during the night, whereby this diurnal rhythmicity of glutamate uptake does not persist under constant environmental conditions [47]. Expression of the glutamate transporter Eaat3 in the SCN of rats is elevated around the dark-light transition [48]. Alterations in the expression of glutamate-associated genes have also been observed in clock gene mutant mice. Clock-Δ19 mice show altered expression of glutamate receptors in the NAc and the VTA [37] [49]. Per2 Brdm1 mutant mice express lower levels of glutamate transporter Eaat1 mRNA and protein leading to reduced glutamate uptake by astrocytes. The resulting increase in glutamate levels in the extracellular space has been associated with alcohol dependence in mice and humans [50].
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GABA
Comparable to its precursor glutamate, the major inhibitory neurotransmitter GABA is ubiquitously expressed in the brain. In the SCN, 95% of all neurons are GABAergic [51]. Although GABA-A receptor subunit b1 is downregulated in the VTA of Clock-Δ19 mice and the GABA-synthetizing glutamate decarboxylase GAD67 shows diurnal oscillations in some brain regions, rather little is known about how GABA itself or its signaling are regulated by the circadian clock [37] [52].
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Norepinephrine
The neurotransmitter norepinephrine (NE; noradrenaline) is involved in the modulation of attention, arousal, and cognition. It is synthetized from DA mainly in the LC of the brainstem, which belongs to the ascending arousal system regulating the sleep-wake cycle. In the lower brainstem and SCN of rats, NE is highest during the early morning [53] [54]. In the rat pineal gland, NE release is high during the night [55]. Interestingly, NE increases melatonin synthesis and induces rhythmic clock gene expression in the pineal gland in vitro, indicating an important role of NE in the rhythmicity of melatonin signaling [56]. In the LC of rats, activity of the NE-synthetizing DA-beta-hydroxylase and of the NE-degrading enzymes MAO-A and MAO-B are higher during the night, whereby expression of MAO-A is probably directly clock-controlled, as previously mentioned [26] [57] [58]. Elevated Per1 expression in TH-positive cells in the LC around the day/night transition as compared to the early subjective day indicates the existence of an endogenous circadian clock in this brain region. Rhythmicity in the LC may result from SCN projections via the DMH ([Fig. 2]), since lesions of the latter eliminate circadian changes in LC impulse activity [59] and loss of LC neurons in Nr2f6 mutant mice affects clock gene expression in LC target regions such as the somatosensory cortex [60].
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Psychiatric Disorders and the Circadian Clock
Psychiatric disorders are heritable to a high degree and associated with various clock gene single nucleotide polymorphisms (SNPs; [Table 1]).
Gene |
Strongest association |
Clinical association |
Reference |
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Clock |
rs1801260 |
ADHD |
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BD |
[86] |
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MDD |
[64] |
||
SCZ |
[65] |
||
rs3805148 |
ADHD (inattention) |
[84] |
|
MD |
[87] |
||
rs12504300 |
ADHD (inattention) |
[84] |
|
rs4864542 |
|||
rs12649507 |
|||
rs534654 |
BD |
[68] |
|
rs6850524 |
|||
rs4340844 |
|||
rs3805148 |
BD |
[87] |
|
rs3736544 |
BD |
[87] |
|
SCZ |
[66] |
||
rs12504300 |
BD |
[87] |
|
rs12648271 |
|||
rs6850524 |
|||
rs10462028 |
BD |
[76] |
|
rs2412648 |
AUD |
[80] |
|
rs11240 |
AUD combined with depression |
[81] |
|
rs1193815 |
SCZ |
[66] |
|
Per1 |
rs11133385 |
SCZ |
[66] |
rs3749474 |
SCZ |
[64] |
|
MD |
|||
rs3027172 |
AUD |
[83] |
|
AUD |
[88] |
||
Per2 |
rs934945 |
Winter depression |
[89] |
rs934945 |
SCZ |
[67] |
|
Rs10462023 |
|||
Per3 |
rs707467 |
BD |
[74] |
rs10462020 |
|||
rs228697 |
Anxiety |
[78] |
|
VNTR rs57875989 |
|||
rs12137927 |
Depression symptoms |
[77] |
|
rs228644 |
|||
rs226482 |
|||
VNTR rs57875989 |
SCZ |
[65] |
|
Cry1 |
rs2287161 |
MD |
[76] |
rs10861688 |
BD |
[75] |
|
Cry2 |
rs10838524 |
Winter depression |
[79] |
rs10838527 |
|||
rs3824872 |
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Attention-deficit hyperactivity disorder
Behavioral states like sleep disturbances and traits like late chronotype have a genetic background, as well as inattentiveness, hyperactivity, and impulsivity—the core symptoms of attention-deficit hyperactivity disorder (ADHD) [61] [62]. ADHD patients perform worse in neurocognitive tests, especially in reaction time variability, intelligence/achievement, vigilance, working memory, and response inhibition. This might be due to problems in switching from resting to an active cognitive state [63] [64]. Concerning the involvement of neurotransmitter systems in ADHD, research has so far largely focused on DA. Many studies show increased DAT binding in ADHD patients [65] [66]. Furthermore, ADHD has been associated with variants in DA receptors, 5-HT transporters and receptor subunits, and glutamate receptors [67] [68] [69]. A high percentage of adults suffering from ADHD report sleep problems and have a later chronotype, which might arise from the disorder itself or, in turn, aggravate it [70] [71]. For pharmacological treatment of ADHD, stimulant and nonstimulant medications are used [72] and influence clock gene expression [60]. The stimulant methylphenidate and the nonstimulant atomoxetine increase synaptic catecholamine concentrations, particularly DA and NE via inhibiting their presynaptic reuptake [73] [74]. Both drugs alter clock gene expression in the murine brain (e. g., Per2 expression in the SCN and the paraventricular nucleus) [75] [76]. Thus, medical treatment of ADHD might lead to further disruption of circadian rhythms, underlining the chrono-pharmacological importance of identifying the right time of treatment. Interestingly, 1 study demonstrated a general loss of rhythmicity in the expression of PER2 and BMAL1 in the oral mucosa of ADHD patients [77]. Furthermore, ADHD is found to be associated with a SNP in the 3’ untranslated region of the human Clock gene (rs1801260 T/C) in some, but not all, studies [11] [78] [79] [80].
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Schizophrenia and bipolar disorder
Schizophrenic patients show, besides the more “popular” psychotic symptoms like delusions and hallucinations, often also a lack of motivation, poor expression of emotions, and cognitive impairments (i. e., speed of processing, attention, working memory, verbal learning and memory, visual learning and memory, reasoning and problem solving, and social cognition) [81] [82] [83]. For a long time, schizophrenia has been described as a disease of DA dysfunction. Schizophrenic patients, especially the ones with a high risk for psychosis, show higher dopaminergic activity and antipsychotics often antagonize D2 and D3 receptors [84] [85] [86]. However, not all symptoms of schizophrenia (e. g., cognitive impairments) can be explained by DA. Therefore, the contribution of other neurotransmitters has been discussed including glutamate, 5-HT, acetylcholine, and GABA [87].
Schizophrenia is often associated with sleep and circadian impairments, including insomnia, irregular and fragmented sleep-wake cycles, and altered free-running rhythms [88] [89] [90] [91]. A recent study showed a circadian variation in the occurrence of auditory hallucinations in schizophrenia patients with the most frequently and longest lasting ones at 18:00–21:00 [92]. Furthermore, recent studies show dampened expression of clock genes in skin fibroblast and blood cells of schizophrenic patients [93] [94]. The C allele of the same Clock SNP rs1801260 (T/C) as described above for ADHD is also associated with schizophrenia in Japanese and Han Chinese [95] [96]. Additionally, the Clock SNPs rs3736544, rs1193815, rs11133385, and rs3749474 are associated with schizophrenia in Japanese females. However, these associations are statistically significant only before correction for multiple testing [97]. Additionally, SNPs in Arntl (rs2290036) and Per2 (rs934945, rs10462023) and other clock genes are associated with schizophrenia and bipolar disorder [98] [99]. Interestingly, late chronotype and longer sleep duration have been associated with a higher risk for schizophrenia in genome-wide association studies of self-reported chronotype and sleep based on the UK biobank [100] [101]. Data from constitutive studies suggested that chronotype and schizophrenia share similar genetic pathways [100].
Bipolar patients display cognitive heterogeneity and dependent on study design and included subjects worse cognitive performance has been shown for verbal learning, visual learning and memory, processing speed, working memory, attention, and global intelligence [102]. Interestingly, stronger cognitive impairment seems to be associated with earlier disease onset and more episodes of mania and depression. Hereby, manic episodes are associated with enhanced activity of the noradrenergic system, shown by increased NE concentrations in urine and cerebrospinal fluid, whereas the opposite occurs during depressive episodes [103]. The enhanced activity of the noradrenergic system might furthermore trigger increased melatonin release in manic episodes. Additionally, it has been speculated that a dysbalance of DA receptors and transporters occurs in bipolar disorder with increased striatal D2/3 receptor availability during manic and increased DAT levels during depressive episodes [104].
Opposite effects during the different episodes are also observed for sleep. During the manic episodes, the need to sleep is decreased in 69–99%, and during the depressive episodes, insomnia and hypersomnia occur in up to 100% and 24–78% of the bipolar patients, respectively [105]. Interestingly, melatonin levels of these patients are decreased in both episodes as well as in euthymic states [106]. Some studies show a higher light sensitivity by a stronger depression of melatonin, which is reduced by treatment with lithium carbonate or sodium valproate [107] [108] [109] [110]. Disturbed circadian rhythms have been reported for locomotor activity, body temperature, cortisol, and different hormones [106]. Clock SNPs (rs1801260, rs534654, rs6850524, rs4340844, rs3805148, rs3736544, rs12504300, rs12648271, rs6850524, rsrs10462028) also are associated with bipolar disorder, particularly with higher life time recurrence rates, increased occurrence of insomnia, worse response to treatment of sleep disturbances, relapse of manic episodes, and evening preference [111] [112] [113]. Furthermore, the Clock SNPs rs534654, rs6850524, and rs4340844, the Per3 SNPs rs707467, and rs10462020), and the Cry1 SNPs rs2287161, and rs10861688 have been associated with bipolar disorder [99] [114] [115] [116].
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Other psychiatric disorders
Patients with major depressive disorder (MDD) display anhedonia, feelings of worthlessness or guilt, loss of energy, and reduced concentration [117]. Brains of these patients have a lower DA, 5-HT, and NE content/action and altered binding of these neurotransmitters to their respective receptors [118]. However, the variability of MDD and the long onset until antidepressants work suggest additional causes for this disease [117]. Along this line, MDD has also been associated with altered connectivity of GABA and glutamatergic neurons [119].
In MDD many physiological rhythms are changed, including melatonin, NE, thyroid stimulating hormone, cortisol, and 5-HT, and transcript rhythmicity is weaker in different brain regions of MDD patients [120] [121] [122] [123]. MDD patients display rhythmic mood changes over the course of the day, often with severe depression in the early morning and mood brightening until the early evening [122]. For clinical symptoms of depression, an association with 3 Per3 SNPs (rs12137927, rs228644, rs228682) has been found in a cross-sectional genetic association study [124]. Two other Per3 SNPs (rs228697, rs57875989-VNTR) have been associated with anxiety disorder, suggesting a role of Per3 in mood regulation [125]. Furthermore, winter depression could be associated with 3 SNPs in the Cry2 gene (rs10838524, rs10838527, rs3824872) [126]. Clock SNPs (rs2412648, rs11240) have also been associated with alcohol use disorder. Hereby, the T allele of rs2412648 (T/G) is a risk factor for alcohol dependence [127]. The G allele of rs11240 (G/C) and the haplotype TTGC of the Clock SNPs rs3805151, rs2412648, rs11240, and rs2412646 was shown to be associated with comorbid depression and alcohol use disorder [128]. For extensive review of Clock gene association with psychiatric disorders see Schuch et al. (2018) [129]. Additionally, a Per1 SNP (rs3027172 C/T) was associated with the use of alcohol. The C allele is a risk factor for problematic drinking and an increased risk for adult alcohol use disorder. It was demonstrated that C allele carriers exposed to elevated early life stress have a higher risk for problematic drinking [130].
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Conclusion
Accumulating evidence suggests that circadian clock and different neurotransmitter systems interact at multiple levels. Genetic alterations in the clock gene machinery—just like external perturbation of the clock system (e. g., in shift workers)—may predispose individuals for the development of psychiatric disorders. At the same time, neurofunctional changes may feedback on circadian rhythm regulation. Since many psychiatric disorders are associated with sleep disturbances, stabilization of the circadian system by fixed sleep-wake cycles and light therapy has been shown to be a promising therapeutic tool [131] [132] [133] [134]. Additionally, behavioral rhythm therapies (e. g., interpersonal and social rhythm therapy [IPSRT]) can stabilize daily activities of patients and have been shown to be as successful as other established intensive psychotherapies in bipolar disorder [103]. Unfortunately, especially in schizophrenia research, only few studies have been conducted to test if stabilizing circadian behavior improves disorder severity [135].
Furthermore, pharmacological treatment has to be carefully timed according to the chronotype of the patient to prevent further disruption and induce stabilization of the circadian system. Several psychopharmacological drugs affect circadian rhythmicity, including methylphenidate, atomoxetine, lithium, valproic acid, quetiapine, agomelatine, and SSRIs [71] [75] [106] [121] [136] [137] [138] [139]. Interestingly, whereas melatonin treatment of ADHD patients improves only sleep latency, but not ADHD scores, treatment with agomelatine, a melatonin agonist, affects both [71] [140] [141]. Unfortunately, circadian effects of pharmacological drugs and how circadian rhythms of neurotransmitters are affected in patients of psychiatric disorders are often not or poorly investigated. From a clinical perspective, this interaction may open new roads for the prevention, diagnosis, and treatment of psychiatric disorders through stabilization, observation, or manipulation, respectively of circadian rhythms and clocks in patients and subjects at risk.
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Conflict of Interest
Johannes Thome has received financial support from pharmaceutical companies (Actelion, Astra Zeneca, Bristol-Myers Squibb, EVER Neuro Pharma GmbH, Janssen-Cilag, Lilly, Lundbeck, MEDICE, Merz, Novartis, Pfizer, Roche, Servier, Shire, Trommsdorff) some of which manufacture medication used in the treatment of ADHD patients. Jana-Thabea Kiehn, Denise Palm, Frank Faltraco, and Henrik Oster have no potential conflicts of interest to disclose.
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Correspondence
Publication History
Received: 21 December 2018
Received: 28 August 2019
Accepted: 08 October 2019
Article published online:
30 October 2019
Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany
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