Jinfeng Duan
Rongmei Yang2
Chenxia Hu- 1Key Laboratory of Mental Disorder's Management of Zhejiang Province, Department of Psychiatry, School of Medicine, First Affiliated Hospital, Zhejiang University, Hangzhou, China
- 2Department of Psychogeriatrics, Hangzhou Seventh People's Hospital, Hangzhou, China
- 3Department of Traditional Chinese Medicine, School of Medicine, First Affiliated Hospital, Zhejiang University, Hangzhou, China
- 4Key Laboratory of Kidney Disease Prevention and Control Technology, School of Medicine, First Affiliated Hospital, Zhejiang University, Hangzhou, China
- 5State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, School of Medicine, First Affiliated Hospital, Zhejiang University, Hangzhou, China
Bipolar disorder (BD) is a severe psychiatric disorder characterized by recurrent episodes of manic/hypomanic or depressive symptoms and euthymic periods, with some patients suffering a gradual deterioration of illness and consequent cognitive deficits during the late stage. Migraine is a disease generally without abnormal medical examinations, neurological examinations or laboratory studies, and the diagnosis is made based on the retrospective demonstration of headache features and groupings of disease-associated symptoms. The epidemiology of comorbid BD and migraine is high and it is obligatory to find effective treatments to improve the prognosis. Recent investigations demonstrated that the close relationship between BD and migraine significantly increased the rapid cycling rates of both BD and migraine in patients. Although the detailed mechanism is complex and largely unclear in comorbid BD and migrain, genetic factors, neurotransmitters, altered signaling pathways, disturbances of inflammatory cytokines, and mitochondrial dysfunction are risk factors of BD and migraine. Particularly these two diseases share some overlapping mechanisms according to previous studies. To this end, we call for further investigations of the potential mechanisms, and more efforts are underway to improve the treatment of people with comorbid BD and migraine. In this review, we provide an overview of the potential mechanisms in patients with BD or migraine and we further discuss the treatment strategies for comorbid BD and migraine and it is obligatory to find effective treatments to improve the prognosis. This work will provide insights for us to know more about the mechanisms of comorbid BD and migraine, provides new therapeutic targets for the treatment and give clinicians some guidance for more appropriate and beneficial treatment.
Introduction
Bipolar disorder (BD) is a severe psychiatric disorder and characterized by recurrent episodes of manic/hypomanic (namely BD-I/BD-II, respectively) or depressive symptoms and euthymic periods, and some patients experience a gradual deterioration of illness and consequent cognitive deficits (1). Therefore, these 2 types of BD was distinguished according to the severity of manic symptoms. Furthermore, BD-II is not severe enough to cause social or occupational functional impairment or hospitalization; in contrast, manic and even psychotic symptoms are more severe in BD-I, and patients often require hospitalization. The incidence rate of symptomatic depression in patients with BD (BD-I or BD-II) are 3 times more than the incidence rate of mania or hypomania (2). The onset of BD occurs predominantly in adolescence or early adulthood. The lifetime prevalence of BD is appropriately 2.1% globally, and the prevalence of subthreshold forms is ~2.4% (3). With a diagnosis of BD, life expectancy decreases by 9 years on average (4), and the completed suicide rates of men and women with BD are 7.8 and 4.9%, respectively (4, 5). After the development of complications related to BD, such as metabolic and cardiovascular diseases, patients with BD will consequently experience poor quality of life, impaired cognitive function, functional impairments and social impairments.
Migraine is a disease without abnormal medical examinations, neurological examinations or laboratory findings, and the diagnosis is made based on retrospective demonstration of headache features and groupings of disease-associated symptoms. Patients with migraine frequently experience episodic attacks, including recurrent headache, gastrointestinal symptoms, and autonomic nervous system symptoms (6). Migraine can also results in decreased quality of life, impaired cognitive function, disturbed brain function and social impairments (7). The prevalence rate of migraine in healthy individuals was 14% with the lifetime prevalence in men was 6%, and 17.6% in women in the United States (8, 9). Psychiatric disorders are common in multiple neurological disorders, migraine is one of the disorders with a high prevalence, and there is a heritable link between BD and migraine (10, 11). Even migraine is not caused by psychiatric illness, and a large proportion of people with migraine are not diagnosed with any comorbid psychiatric disorder. Parental migraine was associated with increased likelihood and a risk factor for offspring BD even in the absence of parental BD, the prevalence of migraine in the BD population may be as high as 39% and rapid cycling as a feature of bipolar disorder and comorbid migraine (10, 12, 13). BD and migraine share multiple similar risk factors, including genetic factors, environmental risk factors, oxidative stress and disturbances of inflammatory cytokines. Both diseases lead to decreased quality of life and multiple dysfunctions in humans (Figure 1). Patients with comorbid BD and migraine have poorer treatment outcomes and increased disability (14). In this review, we provide an overview of the potential mechanisms in patients with BD or migraine and we further discuss the overlapping mechanisms and treatment strategies for comorbid BD and migraine, the potential treatments for patients with comorbid BD and migraine, with the purpose of giving clinicians some guidance for more appropriate and beneficial treatment to the comorbidity.
Figure 1. BD and migraine share multiple similar risk factors, including genetic factors, environmental risk factors, oxidative stress and disturbances of inflammatory cytokines. Both diseases lead to decreased quality of life and multiple dysfunctions in humans.
Methods
We conducted a systematic search of two major databases: PubMed and Embase from January 1991 to July 2020. The search terms used were “bipolar disorder/s, manic depressive, manic depression, comorbidity, and migraine.” The terms were cross-referenced to yield a comprehensive search. We also conducted manual searches of bibliographies of reviewed articles. We included in this review original research articles of descriptive, controlled and animal studies and several review articles. The search was limited to English language journals.
Potential Mechanisms of BD
Multiple pathophysiological processes, such as genetic abnormalities, abnormal regulation of neurotransmitters, altered signaling pathways, reduced neurotrophic factors, inflammatory disturbances, mitochondrial dysfunction, cell apoptosis and impaired cell resilience, may be involved in the development of BD. The interaction of these processes leads to abnormal neuronal function which may result in mood instability, disturbed energy metabolism, abnormal biological rhythms and cognition defects (Table 1). Patients with BD present an increased rate of DNA damage compared to that of controls, which is closely related to the severity of BD symptoms (32). The gray matter volume showed by the positron emission tomography (PET) was significantly decreased in the subgenual prefrontal cortex sections from BD patients, which was closely related to a reduced glial cell number and neuronal cell number or size (33, 34). Calcium signaling, particularly through voltage-gated calcium channels, was thought to play vital roles in the pathogenesis and treatment of BD, the expression of the calcium channel Cav1.2 subunit, which is encoded by CACNA1C (the most likely BD gene), was also abnormally regulated in the pathogenesis of BD (15, 35). Combined data from genome-wide association studies (GWASs) and gene expression experiments revealed that hormone regulation, second messenger pathways, glutamatergic transmission and histone expression, even the immune system were all involved in the pathogenesis of BD (36, 37). Monoamines and gamma-amino butyric acid (GABA) are important in the pathophysiology of BD (16). In addition, serum brain-derived neurotrophic factor (BDNF) is decreased (17), while neurotrophin-3 (NT-3) (18) is upregulated in patients with BD who are experiencing a manic state or a depressive state. Furthermore, controlling the release of BDNF contributes to the effective treatment of BD, and BDNF has been reported to regulate the cell survival rate in individuals with BD (38).
Table 1. Multiple pathophysiological processes participate in the development of BD.
Patients with BD always exhibit a disturbed balance between pro-inflammatory factors and anti-inflammatory factors. The peripheral levels of inflammatory factors, including the interleukin (IL) family, IFN-gamma (IFN-γ) and tumor necrosis factor-alpha (TNF-α), are upregulated in the manic episode of BD patients compared to those in healthy controls, while the level of IL-4 is downregulated in BD patients compared to that in healthy controls (19). Modabbernia et al. demonstrated significantly elevated levels of TNF-α and its receptor, IL-6 and its receptor, IL-2 receptor, IL-4, IL-10, and IL-1 receptor antagonist (IL-1RA) in patients with BD compared to those in healthy individuals (21, 22). In addition, individuals with BD who are experiencing mania have been shown to express higher levels of TNF-α, sTNF-R1, and sIL-2R than healthy controls, and the levels of sTNF-R1 and TNF-α in manic BD patients are higher than those in patients experiencing euthymia. Furthermore, the expression level of sTNF-R1 is significantly upregulated in patients experiencing euthymia compared to that in healthy controls (23). The expression level of the TNF receptor was more significantly decreased in BD patients experiencing a depressive state than in those experiencing a manic/hypomanic state or euthymic state, and this expression level was also downregulated in BDII patients compared to that in BD I patients (24). Adiponectin is decreased in bipolar depression, and might interfere with the pathophysiological mechanisms of BD and its somatic comorbidities via involvement in metabolic and inflammatory processes (39). Glial inflammatory factors, including glial fibrillary acidic protein, nitric oxide (NO) synthase, c-fos and CD11b, and astroglial inflammatory factors, including myeloid differentiation factor 88, nuclear factor-kappa β (NF-κβ), cyclooxygenase, prostaglandin-E synthase, IL-1β and IL-1 receptor, were significantly upregulated in the postmortem frontal cortex of BD patients compared to those in healthy controls, thus indicating that microglial and astroglial activation are promoted during the pathogenetic process of BD (20). However, another study showed that the levels of the N-methyl-D-aspartate (NMDA)receptors NR-1 and NR-3A were downregulated in BD patients compared to those in healthy controls, and the levels of TNF-α and Neural Nitric Oxide Synthase(nNOS) were not altered in these patients (20).
On the other hand, mitochondrial dysfunction results in the impairment of cell resilience and participates in the initiation and progression of BD (40). BD has also been demonstrated to be associated with impaired respiratory complex function and the induction of cellular degeneration (41). Oxidative stress occurs after an imbalance of redox homeostasis is initiated, accompanied by overexpression of free radicals or deficiencies in the antioxidant response. The pH was increased in cerebral tissue from manic patients compared to that in cerebral tissue from euthymic BD patients, but was decreased in cerebral tissue from euthymic BD patients compared to that in cerebral tissue from healthy controls (25). Moreover, expression of mitochondrial electron transport chain-related genes, such as complex I, complex IV and complex V, were downregulated in the frontal cortex of BD patients compared to that in healthy controls (26). In another postmortem study, Buttner et al. showed that oxidative stress-induced DNA fragmentation was enhanced in non-GABAergic neurons in the anterior cingulate cortex of BD patients compared to that of schizophrenic patients or healthy controls (27). Ouabain significantly increased superoxide generation, lipid peroxidation and thiobarbituric acid reactive substances (TBARS) to induce the generation of rats in a mania-like state (28). Moreover, Wang et al. found that the level of 4-hydroxynonenal (4-HNE, a major product of lipid peroxidation) was significantly increased in postmortem anterior cingulate brain sections from BD patients compared to the healthy controls, and 4-HNE levels were significantly correlated with pH values in BD patients (29). However, superoxide dismutase (SOD) activity was found to be upregulated only in patients experiencing acute phases of BD, such as manic episode or depressive episode, but not altered in patients experiencing an euthymic state of BD or healthy controls. In addition, the TBARS level was upregulated in BD patients at all stages compared to that in healthy controls (30). The expression level of 3-nitrotyrosine is upregulated during the early and late stages of BD; in contrast, the expression levels of glutathione reductase and glutathione S-transferase (GST) are significantly upregulated in patients during the late stage of BD compared to those in patients during the early stage of BD. Consequently, cumulative oxidative stress promoted the release of these antioxidant enzymes to reduce further oxidative stress-induced damage during the progression of BD. The total antioxidant status, total oxidant status and oxidative stress index are significantly upregulated in BD patients compared to those in healthy controls. Furthermore, the fact that BD-I is more severe than BD-II may be attributed to the higher total oxidant status in BD-I patients than in BD-II patients (31).
Potential Mechanisms of Migraine
Patients with migraine are more susceptible to headaches and associated clinical symptoms when they are experiencing a hyperexcitable brain state, and they perceive painful emotions and experiences. However, the potential mechanisms underlying the pathophysiology of migraine should be further investigated to shed light on the treatment of this complicated disease (Table 2). The dysfunction of descending pain modulatory circuits, which leads to a loss of pain inhibition and hyperexcitability in nociceptive areas of the brain (53). Dopamine receptors are involved in the determination of migraine trait, and migraine patients with dopaminergic symptoms are characterized by a full-blown, more disabling migraine (54). After scanning five patients who did not receive any migraine prophylaxis by PET, Afridi et al. found that there was a significant activation of the dorsolateral pons during spontaneous migraine attacks and concluded that migraine was a kind of subcortical disorder (55). More recently, other imaging studies have shown that there is also a significant activation of posterior/dorsal thalamic sections in patients with spontaneous migraine (56). Pain signals in the brain are transferred centrally to the trigeminal nucleus caudalis and the trigeminocervical complex, which then sends fibers to the thalamus and the autonomic nuclei, and finally, the thalamic neurons project to the somatosensory cortex and parts of the limbic system. This progress of neural communication is mediated by a number of neuropeptides and neurotransmitters, including monoamines (57). Altered perception of stimuli that is not painful promotes the reflection of pain and activates the feed-forward neurovascular dilator mechanism in the first division of the trigeminal nerve. After stimulation with functional 5-hydroxy tryptamine in the trigeminal nerve endings, the release of calcitonin gene-related peptide was decreased, and a mild level of vasoconstriction could be triggered by stimulating receptors on meningeal blood vessels and the trigeminal nucleus caudalis, thus resulting in decreased central neuronal signaling (57). Monoclonal antibodies to Calcitonin Gene-related Peptide (CGRP) or its receptors, have proven efficacy on migraine prevention, in both episodic and chronic migraine. Kainate and NMDA receptor antagonists, pituitary adenylate cyclase-activating polypeptide(PACAP) type 1 receptor (PAC1) agonists and Kynurenic Acid(KYNA) analogs are still in preclinical phase for the treatment of migraine (58).
Table 2. The potential underlying mechanism during the pathophysiological process of migraine.
Migraine may also be induced by brainstem dysfunction, which initiates perimeningeal vasodilatation and neurogenic inflammation. As the potential mechanisms of migraine are extraordinarily complex, inflammation is a salient factor in the pathophysiology of migraine. The levels of blood oxygenation level-dependent (BOLD) signals are significantly elevated in migraine attacks with extracephalic allodynia compared to those in the corresponding responses (46). In addition, levels of the well-known pro-inflammatory cytokines, including IL-10, TNF-α, and IL-1β were significantly upregulated during acute migraine attacks compared to those outside of acute attacks, while the levels of IL-10 and TNF-α were increased in migraine patients soon after headache onset but decreased over time (47). The release of chemokines was increased in migraine patients and stimulated the activation of trigeminal nerves (48). Oxidative stress, such as NO, serves as a critical factor in the pathophysiology of migraine, and an elevated level of NO-induced inflammation has been reported in migraine patients (48). Moreover, increased expression of NO induced headache in normal volunteers and delayed headache in migraine patients (49). 4-Hydroxy-2-nonenal levels are upregulated in female migraine patients compared to those in healthy controls and have been shown to be significantly correlated with the NO pathway, insulin metabolism and lipid metabolism (50). NO and TBARS levels were upregulated in patients with migraine compared to those in healthy individuals (51, 52). In recent years, studies have shown that imbalances between oxidative stress and the antioxidative response participate in the pathophysiology of migraine, as the levels of oxidative stress-related genes and enzymes are elevated, whereas the levels of antioxidant genes and enzymes are diminished during the progression of migraine.
The Overlapping Mechanisms of BD and Migraine
In recent years, the potential mechanisms of comorbid BD and migraine have been widely investigated, and future research focused on genetic factors, brain imaging, mitochondrial dysfunction and inflammatory factors may further elucidate the underlying mechanisms. Epidemiological and clinical studies have showed a high degree of comorbidity between BD and migraine, they two may have multifactorial polygenic etiology and share common pathophysiology (59). Since there is a strong bidirectional association between migraine and BD, revealing the potential overlapping neurobiological mechanisms of these two diseases could promote the development of novel treatments. Parental migraine has been demonstrated to serve as a risk factor for offspring BD, even in patients without parental BD, and there seems to be a common genetic factor between BD and migraine. However, BD is more closely related to comorbid migraine than parental migraine, and this elevated comorbidity may be attributed to nongenetic factors (60). Both of BD and migraine are closely associated with abnormalities in serotonergic pathways, dopaminergic pathways, and glutaminergic systems. Central serotonergic activity is reduced during the depressive and euthymic phases of BD (61), while the serotonin level is low in migraine patients between attacks and is upregulated after the initiation of a migraine attack (62). As dopamine is a well-recognized factor in migraine pathophysiology, dopamine receptor antagonists, as prochlorperazine, chlorpromazine, metoclopramide, and promethazine are first-line agents in the emergency room setting for migraine (63). The levels of glutamate were significantly upregulated in the anterior cingulate cortex and downregulated in the hippocampus in BD patients compared to those in controls (64). Glutamate from platelets was released and amino acids was increased in migraine patients with aura and without aura, although this increase was more significant in migraine patients with aura. Platelet glutamate uptake, assessed by 3H-glutamate intake, was increased in migraine patients with aura, but it was reduced in migraine patients without aura compared to that in healthy controls (65). The blood levels of leptin and adiponectin of the migraineurs are associated with disease pathogenesis of migraine (66).
Calcium channels Cav1, Cav2, and Cav3 are the targets of mutations and polymorphisms that alter their function and regulation can lead to neuropsychiatric diseases, including migraine and BD (67). Genome-wide linkage studies in BD and migraine patients proved that there were overlapping areas of linkage on chromosomes. CACNA1A and CACNA1C, which are voltage-dependent calcium channels, have recently been proven to play critical roles in FHM and BD. Furthermore, there is a locus on chromosome 20p11 with overlapping elevated logarithm of odds scores for both migraine and BD, and the locus harbors a well-known gene, namely, SLC24A3, which encodes a potassium-dependent sodium/calcium exchanger for maintaining calcium homeostasis in nervous tissue (68). Although another study found that there was no relationship between rs10994336 in ANK3 during the progression of BD and rs1006737 in CACNA1C during the progression of migraine, this result may be attributed to the small sample size (69). Oedegaard et al. used GWAS to compare BD patients without headache and BD patients with migraine and found that there were nine single nucleotide polymorphism (SNP) (Chr13:41192397-41388566) values in chromosome 13q14.1 in BD patients with migraine, and genetic variants of the KIAA0564 gene region may predispose to migraine headaches in patients with BD. The strongest relationship was reported for several single nucleotide polymorphisms in a 317-kb region, whereas rs9566845 and rs9566867 remained the most prominent genetic variants in this study (70). Dopamine pathway genes, including LIM homeobox transcription factor 1, alpha (LMX1A) and neuregulin 1 (NRG1), are associated with cognitive performance in BD patients, the rs35753505 SNP was associated with increased performance, while the rs11809911 SNP in LMX1A was associated with reduced IQ and memory (71).
Furthermore, it has been reported that the pathophysiologic mechanisms of BD and migraine can be attributed to chronic inflammation, a disturbance of the balance between oxidative stress and the antioxidative stress response, and the regulation of nitrosative stress (72, 73). Panx1 channels and Connexins 43 hemichannels appears to be involved in inflammation and has been documented in migraine and BD (74). Furthermore, targeting the inflammatory pathways may decrease the cooccurrence of BD and migraine; thus, the elucidation of the related inflammatory pathways may offer new pharmacological strategies (75, 76). In addition, these inflammatory cytokines may serve as biomarkers for the prediction of outcomes. These pathological mechanisms may induce cross-sensitization between BD and migraine, thus shifting the illnesses to a more severe form, and patients with both diseases respond poorly to pharmacotherapies, with relapsing acute mood episodes, cognitive dysfunction and functional deficiency, and decreased life expectancy.
Current Treatments of BD and Migraine
Current Treatments of BD
Patients with BD theoretically experience interspersed euthymia and relapsing mood episodes of depressive and manic status (77), while actual BD symptoms are more complex, and the patients experience mixed mood states and potential cognitive impairments (78). As BD is termed as a dynamic and fluctuating disease, the control of this lifelong disease is challenging. During the early stages, patients with BD respond favorably to psychiatric and psychosocial therapy and exhibit less cognitive dysfunction and fewer functional impairments, but they exhibit accelerated rapid cycling of episodes, severe brain structural abnormalities, a higher prevalence of other comorbid diseases, and many more abnormal peripheral biomarkers after the illness progresses (79).
Mood stabilizers, including the univalent ion lithium, valproate, lamotrigine, and carbamazepine, serve as the cornerstones of therapy, and individual atypical antipsychotic medications are emerged as common choices to control acute manic/hypomanic and acute depression in order to maintain the treatment during the remission phase (80). Although patients with BD sometimes experience a normal mood state, they may also experience persistent mood instability during this period (81). Moreover, the relapse rate is high even in patients receiving combination treatment. Depression or mania will recur in 37% of patients within 1 year and in 60% of patients within 2 years (82). Mood episodes, especially mania, have been demonstrated to be related to cell death of neuronal cells and glial cells, which is induced by apoptotic inflammatory cytokines (83). Thus, it is urgent for investigators to develop new drugs to eliminate these inflammatory factors targeting at these disorders; lithium and valproate exert protective effects through their immunomodulatory properties in BD patients (75). Traditional mood stabilizers for BD significantly downregulate the levels of phospholipase A2 (PLA2) and cyclooxygenase (COX), which directly participate in the regulation of immunity and inflammatory cytokine release (84), and other drugs, including nonsteroidal anti-inflammatory drugs (NSAIDs) and glucocorticoids, also exert anti-inflammatory activity to ameliorate BD symptoms (85). In addition to anti-inflammatory function, mood stabilizers (lithium and valproate) upregulate SOD activity and glutathione activity and downregulate the generation of oxidative stress and mitochondrial dysfunction in BD (86). Long-term oral administration of lamotrigine or olanzapine significantly upregulated GST-M1 expression levels and GST activity in rat cerebral cortical cells, which suggested that GST-M1 may serve as an important drug target for the treatment of BD (87). Patients receiving behavioral and cognitive-behavioral therapies are free from the adverse effects of chemical drugs; in addition, such therapies make it easier for the patients to control their own disease by modifying distorted thinking, increasing their motivation to participate in pleasurable activities and improving their problem-solving abilities, and these therapies can be easily added to integrated therapy. The combination of pharmacotherapy, behavioral and cognitive-behavioral therapies improves medication adherence, delaying disease recurrence and improving the maintenance of treatment gains in patients with BD (88).
Current Treatments of Migraine
The symptoms of patients with migraine can be influenced by environmental triggers, including bad eating habits, sleep disorders, stressful stimulation, emotional status, hormone fluctuations in women, and weather changes (57). The current main treatment for moderate-to-severe migraine is serotonin receptor agonists, namely, triptans (89). After treatment with a triptan and another serotonergic agent, migraine patients may experience serotonin syndrome (90), and clinicians must pay attention to control the side effects of these agents. Several preventive medications, including anti-depressive drugs, antiepileptic drugs, hypotensive drugs, dietary supplements, herbal medicines, and botulinum toxin, are widely used as effective preventive treatments for clinical migraine symptoms (91). The comorbidity of migraine with evening chronotype BD patients is higher than compared with non-evening types of BD, and exogenous melatonin supplementation plays the potential prophylactic role in patients with episodic migraine, even there is no conclusive evidence comparing the efficacy of exogenous melatonin supplementation for migraine prophylaxis to the other FDA-approved pharmacotherapy (92, 93). Doctors can choose a targeted medication according to the patient's general health state, current comorbidities, additional drugs and personal preferences. In addition to medications, other strategies, including lifestyle changes, self-management techniques, and relaxation, can be used to control the symptoms of migraine in patients (94).
Potential Treatments for Patients With Comorbid BD and Migraine
There are still no optimal alternative treatments for patients suffering from comorbid BD and migraine, but several pharmacological treatments, such as valproate, lithium, lamotrigine, quetiapine and topiramate, are widely used to prevent the onset of both migraine attacks and acute manic or depressive episodes in patients with BD (95, 96). Patients with comorbid BD and migraine were younger and more educated and had a family history of either disease, but they had fewer hospitalizations for psychiatric disorders. The initial symptom for such patients is depression rather than hypomania or mania, and they are prescribed fewer mood stabilizers but more atypical antidepressants by their doctors. Improper antidepressant treatment used and analgesic drug abuse in cormobid patients is not rare, which leads to the reduction threshold of pain in cormobid BD with migraine patients, and then, may further interfer the patients' clinical medication (97). BD patients with migraine experience missed diagnosis and a lack of effective treatments; 27.9% of these patients receive antimigraine medications (triptans) (98). A study demonstrated that 1.8% of the total study population received specific treatments for migraine, and 0.45% of the population received a mood-stabilizing agent for BD; among these patients, only 843 in 4,640,219 individuals received both types of medications. Moreover, there was a strong positive association between treatment with migraine medications and treatment with mood-stabilizing agents (99). In recent years, comorbidity with BD has garnered increased attention, particularly in the psychiatric literature. Some treatments may exert adverse effects on the comorbid condition of BD and migraine, and that a tricyclic antidepressant may induce mania and aggravate the progression of disease (100). For patients with comorbid BD and migraine, mood stabilizer maybe the useful treatment, include lithium, anticonvulsant drugs and atypical antipsychotics. In the presence of mixed features of mood episodes, patients with comorbid BD and migraine should be better prescribed with sodium valproate, lamotrigine priority rather than lithium (101). Some specific psychoactive medications such as cognitive behavioral therapy and social rhythm therapy also have effects on the treatment of both BD and migraine (102).To this end, additional clinical and preclinical experimental studies should expand the investigation of new therapies for treating both BD and migraine.Deep transcranial magnetic stimulation (dTMS) (one of the new physical stimulation techniques used for the treatment of different neuropathologies) was also explored as a possible treatment for BD and migraine and may have beneficial neurocognitive effects by targeting on the left dorsolateral prefrontal cortex (DLPFC) (103). Electrical neuromodulation approaches as vagus nerve stimulation (VNS) is one of the treatment to migraine and may cause changes in leptin and associated mediators of immunometabolic signaling, with higher at baseline level of IL-10 and elevated IL-1b (104, 105). Improving the clinicians' recognition and diagnosis of comorbid BD with migraine accurately is of great importance.
Conclusions
There are several limitations in this review. Firstly, included studies in this review are not systematic and may be intrinsically susceptible to bias, we cannot guarantee the quality and pertinence of these studies. Secondly, animal models of BD and migraine are scarce for further investigation of the mechanisms and treatments. Thirdly, we are not able to get a conclusion about the treatments between BD and migraine since the diagnosis varies according to different researches. Lastly, although the overlapping biological mechanisms seem to be genetic factors, abnormal neurotransmitters, inflammation, and mitochondrial dysfunction, and these factors cooperate to initiate and accelerate the progression of BD and migraine. It is hard to find a specific strategy to improve the therapeutic effects of the comorbidity according to current studies since the underling mechanisms are very complex and migraine symptoms may exacerbate BD symptoms and interfere with BD management. In recent years, inflammation and mitochondrial dysfunction have attracted interest from multiple investigators, and they have been shown to exert important effects on the pathogenesis of BD and migraine. By this way, an improved understanding of the overlapping mechanisms during the pathogenesis of comorbid BD and migraine will significantly improve the diagnosis and treatment then improve the therapeutic effects for patients with comorbid BD and migraine. In our opinion, although preventive medications, including mood-stabilizing agents and serotonergic agents, are widely used in patients with BD and migraine, respectively, additional effort is needed. To improve the prognosis of patients with comorbid BD and migraine, the identification of more effective and less toxic drugs and the improvement of poor compliance are essential. Safe and efficacious neuromodulatory approaches offer the prospect of treatment on comorbid BD with migraine in the future, as clinical researches on TMS or VNS to treat comorbid BD and migraine are expected to show effective therapeutic and cognitive improvement, as well as long-term follow-up studies about the changes in inflammatory factors, leptin and adipokines before and after treatment. Also experiments exploring the mechanisms of comorbid BD and migraine are necessary. In the near future, we are looking forward to find an effective treatment targeting on the intersectional mechanism for alleviating illness of patients with comorbid BD and migraine.
Author Contributions
CH conceived the original idea. JD, RY, WL, and LZ wrote the article. SH revised this manuscript, which all authors reviewed and approved for publication.
Funding
Support for this work was provided by the grants from Administration of Traditional Chinese Medicine of Zhejiang Province (2017ZB060) awarded to JD, the National Natural Science Foundation of China (No. 81700553) awarded to CH, the China Postdoctoral Science Foundation (No. 2017M183789) awarded to CH.
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Abbreviations
BD, bipolar disorder; GABA, gamma-amino butyric acid; GDNF, glial cell-derived neurotrophic factor; NT-3, neurotrophin-3; BDNF, brain-derived neurotrophic factor; IL, interleukin; IFN-γ, interferon-gamma; TNF-α, tumor necrosis factor-alpha; NO, nitric oxide; NF-κβ, nuclear factor-kappa β subunits; sTNFR1, soluble TNF-α receptor-1; sIL-6R, soluble IL-6 receptor; IL-1RA, IL-1 receptor antagonist; sIL-2R, soluble IL-2 receptor; TBARS, thiobarbituric acid reactive substances; GST, glutathione S-transferase; PET, positron emission tomography; FHM, familial hemiplegic migraine; PLA2, phospholipase A2; COX, cyclooxygenase; NSAIDs, nonsteroidal anti-inflammatory drugs; AA, arachidonic acid; TMS, transcranial magnetic stimulation; DLPFC, left dorsolateral prefrontal cortex.
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Keywords: bipolar disorder, migraine, mechanism, treatment, genetics, inflammation, neurotransmitter, mitochondrial dysfunction
Citation: Duan J, Yang R, Lu W, Zhao L, Hu S and Hu C (2021) Comorbid Bipolar Disorder and Migraine: From Mechanisms to Treatment. Front. Psychiatry 11:560138. doi: 10.3389/fpsyt.2020.560138
Received: 08 May 2020; Accepted: 02 December 2020;
Published: 11 January 2021.
Edited by:
Andreas Reif, University Hospital Frankfurt, GermanyReviewed by:
Mirko Manchia, University of Cagliari, ItalyChristian Simhandl, Sigmund Freud University Vienna, Austria
Copyright © 2021 Duan, Yang, Lu, Zhao, Hu and Hu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Shaohua Hu, dorhushaohua@zju.edu.cn; Chenxia Hu, 11318093@zju.edu.cn