Biology of bipolar disorder
Bipolar disorder is an affective disorder characterized by periods of elevated and depressed mood. The cause and mechanism of bipolar disorder is not yet known, and the study of its biological origins is ongoing. Although no single gene causes the disorder, a number of genes are linked to increase risk of the disorder, and various gene environment interactions may play a role in predisposing individuals to developing bipolar disorder. Neuroimaging and postmortem studies have found abnormalities in a variety of brain regions, and most commonly implicated regions include the ventral prefrontal cortex and amygdala. Dysfunction in emotional circuits located in these regions have been hypothesized as a mechanism for bipolar disorder.[1] A number of lines of evidence suggests abnormalities in neurotransmission, intracellular signalling, and cellular functioning as possibly playing a role in bipolar disorder.[2]
Studies of bipolar disorder, particularly neuroimaging studies, are vulnerable to the confounding effects such as medication, comorbidity, and small sample size, leading to underpowered independent studies, and significant heterogeneity.[4]
Etiology
Genetic
The etiology of bipolar disorder is unknown. The overall heritability of bipolar is estimated at 79%-93%, and first degree relatives of bipolar probands have a relative risk of developing bipolar around 7–10. While the heritability is high, no specific genes have been conclusively associated with bipolar, and a number of hypotheses have been posited to explain this fact. "The polygenic common rare variant" hypothesis suggests that a large number of risk conferring genes are carried in a population, and that a disease manifests when a person has a sufficient number of these genes. The "multiple rare variant" model suggests that multiple genes that are rare in the population are capable of causing a disease, and that carrying one or a few can lead to disease.[6] The familial transmission of mania and depression are largely independent of each other. This raises the possibility that bipolar is actually two biologically distinct but highly comorbid conditions.[7]
A number of
In light of associations between bipolar and circadian abnormalities (such as decreased need for sleep and increased sleep latency), polymorphisms in the
One particular SNP located on CACNA1C that confers risk for bipolar disorder is also associated with elevated CACNA1C mRNA expression in the prefrontal cortex, and increased calcium channel expression in neurons made from patient induced
No significant association exists for the
Due to the inconsistent findings in GWAS, multiple studies have undertaken the approach of analyzing SNPs in biological pathways. Signaling pathways traditionally associated with bipolar disorder that have been supported by these studies include
A meta-analysis was performed to determine the association between bipolar disorder and oxidative DNA damage measured by 8-hydroxy-2'-8-deoxyguanosine (8-OHdG) or 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG).[26] Levels of 8-OHdG and 8-oxodG are widely used as measures of oxidative stress in mental illnesses.[26] It was determined from this meta-analysis that oxidative DNA damage was significantly increased in bipolar disorder.
Environmental
Manic episodes can be produced by sleep deprivation in around 30% of people with bipolar. While not all people with bipolar demonstrate seasonality of affective symptoms, it is a consistently reported feature that supports theories of circadian dysfunction in bipolars.[27]
Risk factors for bipolar include obstetric complications, abuse, drug use, and major life stressors.[28]
The "
Neurological disorders
Mania occurs secondary to neurological conditions between a rate of 2% to 30%. Mania is most commonly seen in right sided lesions, lesions that disconnect the prefrontal cortex, or excitatory lesions in the left hemisphere.[30]
Diseases associated with "secondary mania" include
Pathophysiology
Neurobiological and neuroanatomical models
The main loci of neuroimaging and neuropathological findings in bipolar have been proposed to constitute dysfunction in a "visceromotor" network, composed of the medial prefrontal cortex (mPFC), anterior cingulate cortex (ACC), orbitofrontal cortex (OFC), hippocampus, amygdala, hypothalamus, striatum and thalamus.[32]
A model of functional neuroanatomy produced by a workgroup led by Stephen M. Strakowski concluded that bipolar was characterized by reduced connectivity, due to abnormal pruning or development, in the prefrontal-striatal-pallidal-thalamic-limbic network leading to dysregulated emotional responses. This model was supported by a number of common neuroimaging findings. Dysregulation of limbic structures is evinced by the fact that hyperactivity in the amygdala in response to facial stimuli has been consistently reported in mania.
Green at al 2007 suggested a model of bipolar disorder based on the convergence of cognitive and emotional processing on certain structures. For example, the dACC and sgACC were cognitively associated with impairment of inhibition of emotional responses and self monitoring, which could translate to emotional stimuli having excessive impact on mood. Deficits in working memory associated with abnormal dlPFC function could also translate to impaired ability to represent emotional stimuli, and therefore the impaired ability to reappraise emotional stimuli. Dysfunction in the amygdala and striatum has been associated with attentional biases, and may represent a bottom up mechanism of dysfunctional emotional processing.[40]
Blond et al. proposed a model centered on dysfunction in an "amygdala-anterior paralimbic" system. This model was based on the consistent functional and structural abnormalities in the ventral prefrontal cortex and amygdala. The model also proposes a developmental component of bipolar disorder, wherein limbic abnormalities are present early on, but rostral prefrontal abnormalities develop later in the course. The importance of limbic dysfunction early in development is highlighted by the observation that amygdala lesions early in adulthood produce emotional abnormalities that are not present in people who develop amygdala damage in adulthood.[41]
Lateralized seizure sequelae similar to bipolar has been reported in people with mesial temporal lobe seizures, and provides support for kindling hypotheses about bipolar.[42] This observation led to the first experiments with anticonvulsants in bipolar, which are effective in stabilizing mood. Studies reporting reduced markers of inhibitory interneurons post-mortem link the analogy with epilepsy to a possible reduction in inhibitory activity in emotional circuits.[41] Overlap with epilepsy extends to include abnormalities in intracellular signaling, biochemistry in the hippocampus and prefrontal cortex, and structure and function of the amygdala.[43]
The phenomenology and neuroanatomy of mania secondary to neurological disorders is consistent with findings in primary mania and bipolar disorder. While the diversity of lesions and difficulty in ruling out premorbid psychiatric conditions limit the conclusions that can be drawn, a number of findings are fairly consistent. Structurally, secondary mania is associated with destructive lesions that tend to occur in the right hemisphere, particularly the frontal cortex, mesial temporal lobe and basal ganglia. Functionally hyperactivity in the left basal ganglia and subcortical structures, and hypoactivity in the right ventral prefrontal and basotemporal cortex have been reported in cases of secondary mania. The destruction of right hemisphere or frontal areas is hypothesized to lead to a shift to excessive left sided or subcortical reward processing.[30]
John O. Brooks III put forward a model of bipolar disorder involving dysregulation of a circuit called the "corticolimbic system". The model was based on more or less consistent observations of reduced activity in the medial orbitofrontal cortex, vlPFC, and dlPFC, as well as the more or less consistent observations of increased activity in the amygdala, parahippocampal gyrus, cerebellar vermis, anterior temporal cortex, sgACC, and ACC. This pattern of abnormal activity was suggested to contribute to disrupted cognitive and affective processes in bipolar disorder.[44]
Neurocognition
During acute mood episodes, people with bipolar demonstrate mood congruent processing biases. Depressed patients are quicker to react to negatively valenced stimuli, while manic patients are quicker to react to positively valenced stimuli.
Clinically, mania is characterized by spending sprees, poor judgement, and inappropriate speech and behavior. Congruent with this, mania is associated impulsivity on Go-No Go tasks, deficits in emotional decision making, poor probabilistic reasoning, impaired ability on continuous performance tasks, set shifting, and planning. The clinical phenomenology and neurocognitive deficits are similar to those seen in patients with damage to the orbitofrontal cortex (OFC), which has been reported in functional neuroimaging studies to be abnormal in bipolar mania. Specifically, reduced blood flow to the lateral OFC has been reported, and may reflect dysfunction that leads to the neurocognitive deficits.[47]
In novel environments, both bipolar manic and bipolar euthymic people demonstrate increased activity, exploration and linear movement that is greater than controls, people with ADHD and people with schizophrenia. Using this behavioral pattern in "reverse translational" studies, this behavioral abnormality has been associated with the cholinergic-aminergic hypothesis, which postulates elevated dopaminergic signaling in mania. Reducing the function of DAT using pharmacological or genetic means produces a similar behavioral pattern in animal models. Pharmacological data is consistent with dysfunction of dopamine in bipolar as some studies have reported hypersensitivity to stimulants (however, some studies have found that stimulants effectively attenuate manic behavior, and co-morbid ADHD and bipolar are effectively treated with stimulants),[48] and the mechanism of antimanic drugs may involve attenuating dopamine signalling.[49]
Hypersensitivity of reward systems is consistent across mood states in bipolar, and is evident in the prodrome. Increases in goal directed behavior, risk taking,[50] positive emotions in response to reward, ambitious goal setting and inflexibility in goal directed behaviors are present in euthymia. Neuroimaging studies are consistent with trait hypersensitivity in reward systems, as both mania and depression is associated with elevated resting activity in the striatum, and elevated activity in the striatum and OFC during emotional processing, receipt of reward, and anticipation of reward.[51] Increased activity in the striatum and OFC has also been reported in euthymia during anticipation and receipt of reward, although this finding is extremely inconsistent.[52] These abnormalities may be related to circadian rhythm dysfunction in bipolar, including increased sleep latency, evening preference and poor sleep quality, as the neural systems responsible for both processes are functionally linked.[51] A few lines of evidence suggest that elevated dopamine signaling, possibly due to reduced functionality in DAT, underlie abnormalities in reward function. Dopaminergic drugs such as L-DOPA can precipitate mania, and drugs that attenuate dopaminergic signaling extracellularly (antipsychotics) and intracellularly (lithium) can be efficacious in treating mania. While a large body of translational evidence exists to support DAT hypofunction, in vivo evidence is limited to one study reporting reduced DAT binding in the caudate.[53]
Neuroimaging
Structural
In a review of structural neuroimaging in bipolar disorder, Strakowski proposed dysfunction in an iterative emotional network called the "anterior limbic network", composed of the thalamus, globus pallidus, striatum, ventrolateral prefrontal cortex, ventromedial prefrontal cortex, ACC, amygdala, dorsolateral prefrontal cortex, and cerebellar vermis. Structural imaging studies frequently find abnormalities in these regions which are putatively involved in emotional and cognitive functions that are disrupted in bipolar disorder. For example, while structural neuroimaging studies do not always find abnormal PFC volume in bipolar disorder, when they do, PFC volume is reduced. Furthermore, reduced PFC volume is associated with response inhibition deficits and duration of illness. When the PFC at large is not examined and the focus is narrowed to the orbitofrontal cortex and medial prefrontal cortex, results more consistently observed reductions, although not in bipolar youth. The sgACC volume is observed to be reduced not only in bipolar disorder, but also in unipolar disorder, as well as people with a family history of affective disorders. Enlargement of the striatum and globus pallidus are commonly found, and although some studies fail to observe this, at least one study has reported no volumetric but subtle morphometric abnormalities.[39]
Structural neuroimaging studies consistently report increased frequency of white matter hyperintensities in people with bipolar. However, whether or not the lesions play a causative role is unknown. It is possible that they are a result of secondary factors, such as the processes underlying an increased risk of cardiovascular disease in bipolar. On the other hand, the observation of reduced white matter integrity in frontal-subcortical regions makes it possible that these hyperintensities play a role dysfunction between limbic and cortical regions. Global brain volume and morphology are normal in bipolar. Regional deficits in volume have been reported in ventrolateral and dorsolateral prefrontal regions. Based on this, it has been suggested that reduced limbic regulation by prefrontal regions plays a role in bipolar. Findings related to the volume of the basal ganglia have been inconsistent.
In healthy controls, amygdala volume is inversely related to age. This relationship is reversed in bipolar disorder,[55] and meta analyses have found reduced amygdala volume in pediatric bipolar disorder, and increased amygdala volume in adulthood.[56][57] This is hypothesized to reflect abnormal development of amygdala, possibly involving impaired synaptic pruning, although this may reflect medication or compensatory effects; that is, these abnormalities may not be involved in the mechanism of bipolar, and may instead be a consequence.[58]
A 2016 meta analysis reported that bipolar disorder was associated with grey matter reductions bilaterally in the ACC, vmPFC, and insula extending to the temporal lobe. When compared with grey matter reductions in unipolar depression, significant overlap occurred in the insular and medial prefrontal regions. Although unipolar depression was associated with reductions in the ventral most and dorsal most regions of the mPFC and bipolar with a region near the genu of the corpus callosum, the overlap was still statistically significant.[59] Similar to the overlap with major depression, a significant overlap of bipolar disorder with schizophrenia in grey matter volume reduction occurs in the anterior cingulate cortex, medial prefrontal cortex, lateral prefrontal cortex and bilateral insula.[60]
A 2010 meta analysis of differences in regional grey matter volume between controls and bipolar disorder reported reductions bilaterally in the inferior frontal cortex and insula, which extended more prominently in the right side to include the precentral gyrus, as well as grey matter reductions in the pregenual anterior cingulate cortex (BA24) and anterior cingulate cortex (BA32).[61] One meta analysis reported enlargement of the lateral ventricles and globus pallidus, as well as reductions in hippocampus volume and cross sectional area of the corpus callosum.[62] Another meta analysis reported a similar increase volumes of the globus pallidus and lateral ventricles, as well as increased amygdala volume relative to people with schizophrenia.[63] Reductions have also been reported in the right inferior frontal gyrus, insula, pars triangularis, pars opercularis, and middle and superior temporal gyrus.[64] Structural neuroimaging in people who are susceptible to bipolar disorder (i.e., have a number of relatives with bipolar disorder) have produced few consistent results. Consistent abnormalities in adult first degree relatives include larger insular cortex volumes, while offspring demonstrate increased right inferior frontal gyrus volumes.[65]
The ENIGMA bipolar disorder working group reported cortical thinning in the left Pars opercularis (BA44-inferior frontal gyrus), left fusiform gyrus, left rostral middle frontal cortex, right inferior parietal cortex, along with an increase in the right entorhinal cortex. Duration of illness was associated with reductions bilaterally in the pericalcarine gyrus, left rostral anterior cingulate and right cuneus, along with increases in the right entorhinal cortex. Treatment with lithium was associated with increased cortical thickness bilaterally in the superior parietal gyrus, left paracentral gyrus, and left paracentral lobule. A history of psychosis was associated with reduced surface area in the right frontal pole.[54] Another study on subcortical abnormalities by the same research group reported reductions in the hippocampus, amygdala, and thalamus, along with ventricular enlargement.[66]
One meta analysis reported that when correcting for lithium treatment, which was associated with increased hippocampal volume, people with bipolar demonstrate reduced hippocampus volume.[67]
White matter is reduced in the posterior corpus callosum, regions adjacent to the anterior cingulate, the left optic radiation, and right superior longitudinal tract, and increased in the cerebellum and lentiform nuclei.[68]
Functional
Studies examining resting blood flow, or metabolism generally observed abnormalities dependent upon mood state. Bipolar depression is generally associated with dlPFC and medial orbitofrontal cortex hypometabolism. Less consistent associations include reduced temporal cortex metabolism, increased limbic metabolism and reduced ACC metabolism. Mania is also associated with dlPFC and OFC hypometabolism. Limbic hypermetabolism is more consistent than in bipolar depression, but the overall study quality is low due to limitations associated with neuroimaging in acutely manic patients.[70] Another review reported that mania is generally associated with frontal/ventral hypoactivation, while depression is generally associated with the opposite. A degree of lateralization with regard to abnormalities has been reported, with mania being associated with the right hemisphere, and depression the left. Trait abnormalities in euthymic patients have been observed, including hypoactivity in the ventral prefrontal cortex, and hyperactivity in the amygdala.[71]
During cognitive or emotional tasks, functional neuroimaging studies, consistently find hyperactivation of the basal ganglia, amygdala, and thalamus. Prefrontal abnormalities are less consistently reported, although hyperactivation in the ventral prefrontal cortex is a fairly consistent finding.[72] Hyperactivity in the amygdala and hypoactivity in the medial and ventral prefrontal cortex during exposure to emotional stimuli has been interpreted as reflecting dysfunction in emotional regulation circuits. Increased effective connectivity between the amygdala and orbitofrontal cortex, and elevated striatal responsiveness during reward tasks have been interpreted as hyper-responsiveness in positive emotion and reward circuitry. The abnormal activity in these circuits has been observed in non-emotional tasks, and is congruent with changes in grey and white matter in these circuits.[73] Neural response during reward tasks differentiates unipolar depression from bipolar depression, with the former being associated with reduced neural response and the latter being associated with elevated neural response.[74] An ALE meta analysis of functional neuroimaging comparing adults and adolescents found a larger degree of hyperactivity in the inferior frontal gyrus and precuneus, as well as a larger degree of hypoactivity in the anterior cingulate cortex in adolescents relative to adults[75]
Regardless of mood state, during response inhibition tasks, people with bipolar disorder underactivate the right inferior frontal gyrus. Changes specific on euthymia include hyperactivations in the left superior temporal gyrus and hypoactivations in the basal ganglia, and changes specific to mania include hyperactivation in the basal ganglia.
A meta analysis using region of interest (as opposed to statistical parametric mapping) analysis reported abnormalities across paradigms for euthymic, depressed, and manic subjects. In bipolar mania, reduced activity was reported in the superior, middle, and inferior frontal gyri, while increased activity was reported in the parahippocampal, superior temporal, middle temporal, and inferior temporal gyri. In bipolar depression, reduced activity was reported in the sgACC, ACC, and middle frontal gyrus. In euthymia, reduced activity was reported in the dlPFC, vlPFC, and ACC, while increased activity was reported in the amygdala. During studies examining response to emotional faces, both mania and euthymia were reported to be associated with elevated amygdala activity.[77]
An activation likelihood estimate meta analysis of bipolar studies that used paradigms involving facial emotions reported a number of increases and decreases in activation compared to healthy controls. Elevated activity was reported in the parahippocampal gyrus, putamen, and pulvinar nuclei, while reduced activity was reported bilaterally in the inferior frontal gyrus. Compared to major depressive disorder, bipolar patients overactivated the vACC, pulvinar nucleus, and parahippocampus gyrus/amygdala to a greater degree, while underactivating the dACC. Bipolar subjects overactivated parahippocampus for both fearful and happy expressions, while the caudate and putamen were overactive for happiness and fear respectively. Bipolar subjects also underactivated the ACC for both fearful and happy expressions, while the IFG was underactivated for fearful expressions only. These results were interpreted as reflecting increased engagement with emotionally salient stimuli in bipolar disorder.[78]
Specific symptoms have been linked to various neuroimaging abnormalities in bipolar disorder, as well as schizophrenia. Reality distortion, disorganization, and psychomotor poverty have been linked to prefrontal, thalamic, and striatal regions in both schizophrenia and bipolar (Table 1).[79]
Symptom dimension | Implicated regions in bipolar | Implicated regions in schizophrenia |
---|---|---|
Disorganization |
|
|
Reality distortion |
|
|
Psychomotor poverty |
|
|
Frontal cortex
Different regions of the ACC have been studied in the literature, with the subgenual (sgACC) and rostral (rACC) parts being largely separated. Grey matter volume in the sgACC has been, albeit with some exceptions, found to be reduced in bipolar. Along with this, bipolar is associated with increased blood flow in the sgACC that normalizes with treatment. Congruent with these abnormalities is a reduction in glial cells observed in post mortem studies, and reduced integrity of white matter possibly involving a hemispheric imbalance. Findings in the rACC are largely the same as the sgACC (reduced GM, increased metabolism), although more studies have been carried out on protein expression and neuronal morphology. The rACC demonstrates reduced expression NMDA, kainate and GABA related proteins. These findings may be compensating for increased glutaminergic afferents, evidenced by increased Glx in MRS studies. One VBM study reported reduced grey matter in the dACC. Inconsistent results have been found during functional neuroimaging of cognitive tasks, with both decreased and increased activation being observed. Decreased neuron volume and a congruent increase in neural density have been found in the dACC. Reduced expression of markers of neural connectivity have been reported (e.g.
The orbitofrontal cortex demonstrates reduced grey matter, functional activity,
Although the role of acute mood states is unknown, grey matter volume is generally reported as reduced in the dlPFC, along with resting and task evoked functional signals. Signals of myelination and density of GABAegic neurons is also reduced in the dlPFC, particularly in layers II-V.[81]
Neurochemistry
Magnetic resonance spectroscopy
Increased combined glutamine and glutamate (Glx) have been observed globally, regardless of medication status.[82] Increased Glx has been associated with reduced frontal mismatch negativity, interpreted as dysfunction in NMDA signaling.[83] N-acetyl aspartate levels in the basal ganglia are reduced in bipolar disorder, and trends towards increased in the dorsolateral prefrontal cortex. NAA to creatine ratios are reduced in the hippocampus.[84]
One review of
One meta-analysis reported no changes in MRS measured GABA in bipolar disorder.[88]
Monoamines
Various hypotheses related to
Studies of the binding potential of dopamine receptor D2 and dopamine transporter have been inconsistent but dopamine receptor D1's binding potential has been observed to be decreased. Drugs that release dopamine produce effects similar to mania, leading some to hypothesize that mania involves increased catecholaminergic signalling. Dopamine has also been implicated through genetic "reverse translational" studies demonstrating an association between reduced DAT functionality and manic symptoms. The binding potential of muscarinic receptors are reduced in vivo during depression, as well as in post mortem studies, supporting the cholinergic aminergic balance hypothesis.[90]
The role of monoamines in bipolar have been studied using neurotransmitter metabolites. Reduced concentration of
Studies of serotonin's primary metabolite
One more line of evidence that suggests a role of monoamines in bipolar is the process of antidepressant related affective switches.
Hypothalamic pituitary adrenal axis
Bipolar disorder is associated with elevated basal and dexamethasone elicited cortisol and adrenocorticotropic hormone (ACTH). These abnormalities are particularly prominent in mania, and are inversely associated with antipsychotic use.[97] The incidence of psychiatric symptoms associated with corticosteroids is between 6% and 32%. Corticosteroids may precipitate mania, supporting the role of the HPA axis in affective episodes.[96] Measures from urinary versus salivary cortisol have been contradictory, with one study of the former concluding that HPA hyperactivity was a trait marker, while a study of the latter concluded that no difference in HPA activity exists in remission.[98] Measurement during the morning are thought to be more sensitive due to the cortisol awakening response. Studies are generally more consistent, and observe HPA hyperactivity.[98]
Neurotrophic factors
Brain derived neurotrophic factor levels are peripherally reduced in both manic and depressive phases.[99]
Intracellular signaling
The levels of
Mania may be specifically associated with protein kinase C hyperactivity, although most evidence for this mechanism is indirect. The gene DGKH has been reported in genome wide association studies to be related to bipolar disorder, and it is known to be involved in PKC regulation. Manipulation of PKC in animals produces behavioral phenotypes similar to mania, and PKC inhibition is a plausible mechanism of action for mood stabilizers. Overactive PKC signalling may lead to long term structural changes in the frontal cortex as well, potentially leading to progression of manic symptoms.[102][103]
Excessive response of arachidonic acid signaling cascades in response to stimulation by dopamine receptor D2 or NMDA receptors may be involved in bipolar mania. The evidence for this is primarily pharmacological, based on the observation that drugs that are effective in treating bipolar reduced AA cascade magnitude, while drugs that exacerbate bipolar do the opposite.[105]
Calcium homeostasis may be impaired across all mood states. Elevated basal intracellular, and provoked calcium concentrations in platelets and transformed lymphoblasts are found in people with bipolar. Serum concentrations of calcium are also elevated, and abnormal calcium concentrations in response to stimulation of olfactory neurons is also observed. These findings are congruent with the genetic association of bipolar with CACNAC1, an L-type calcium channel,[101] as well as the efficacy of anti-epileptic agents.[106] Normal platelets placed in plasma from people with bipolar disorder do not demonstrate elevated levels of intracellular calcium, indicating that dysfunction lies intracellularly. One possible mechanism is that elevated inositol triphosphate (IP3) caused by hyperactive neuronal calcium sensor 1 causes excessive calcium release.[31] Serum levels of S100B (a calcium binding protein) are elevated in bipolar mania.[107]
Mitochondrial dysfunction
Some researchers have suggested bipolar disorder is a mitochondrial disease. Some cases of familial chronic progressive external ophthalmoplegia demonstrate increased rates of bipolar disorder before the onset of CPEO, and the higher rate of maternal inheritance patterns support this hypothesis.[108] Downregulation of genes encoding for mitochondrial subunits, decreased concentration of phosphocreatine, decreased brain pH, and elevated lactate concentrations have also been reported. Mitochondrial dysfunction may be related to elevated levels of the lipid peroxidation marker thiobarbituric acid reactive substances, which are attenuated by lithium treatment.[109]
Neuropathology
A number of abnormalities in GABAergic neurons have been reported in people with bipolar disorder. People with bipolar demonstrate reduced expression of
The observation of increased Glx in the prefrontal cortex is congruent with the observation of reduced glial cell counts and prefrontal cortex volume, as glia play an important role in glutamate homeostasis.[111] Although the number and quality of studies examining NMDA receptor subunits is poor, evidence for reduced NMDA signaling and reduced contribution from the NR2A subunit is consistent.[112]
Decreased neuron density and soma size in the ACC and dlPFC has been observed. The dlPFC also demonstrates reduced glial density, a finding that is less consistent in the ACC. The reduction in cell volume may be due to early stage apoptosis, a mechanism that is supported by studies observing reduced anti-apoptotic gene expression in both peripheral cells and neurons, as well as the reduction in BDNF that is consistently found in bipolar.[113] Reductions in cortical glia are not found across the whole cortex (e.g. somatosensory areas demonstrate normal glial density and counts), indicating that systematic dysfunction in glial cells is not likely; rather, abnormal functionality of connectivity in specific regions may result in abnormal glia, which may in turn exacerbate dysfunction.[114]
Dendritic atrophy and loss of
Immune dysfunction
Elevated levels of
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