Several structural and cellular changes, including marked glial anomalies, have been
observed in association with major depressive disorder. Here we review these cellular
alterations and highlight the importance of glial cell pathology, especially astroglial
dysfunction, in the pathophysiology of neuropsychiatric disorders with a particular
interest in major depressive disorder. The functional role of astrocytes in glutamate
uptake and glutamate/glutamine cycling is discussed, as is the deleterious effects
of chronic stress on glial cell function. Lastly, we discuss the effect of antidepressants
on glial cell function and the possibility of targeting glial cells in the quest to
develop novel therapeutics.
Key Words
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References
- Neural circuits underlying the pathophysiology of mood disorders.Trends Cogn Sci. 2012; 16: 61-71
- Morphological brain changes in depression: Can antidepressants reverse them?.CNS Drugs. 2002; 16: 361-372
- Die Cellularpathologie in ihrer Begründung auf physiologische und pathologische Gewebelehre.A. Hirschwald, Berlin1858
- Regulation of synaptic connectivity by glia.Nature. 2010; 468: 223-231
- Myelination and the trophic support of long axons.Nat Rev Neurosci. 2010; 11: 275-283
- Repertoire of microglial and macrophage responses after spinal cord injury.Nat Rev Neurosci. 2011; 12: 388-399
- Microglia sculpt postnatal neural circuits in an activity and complement-dependent manner.Neuron. 2012; 74: 691-705
- Microglia as modulators of cognition and neuropsychiatric disorders.Glia. 2013; 61: 62-70
- Heterogeneity of astrocytic form and function.Methods Mol Biol. 2012; 814: 23-45
- Astrocytes: Multitalented stars of the central nervous system.Methods Mol Biol. 2012; 814: 3-7
- Regional astrocyte allocation regulates CNS synaptogenesis and repair.Science. 2012; 337: 358-362
- Uniquely hominid features of adult human astrocytes.J Neurosci. 2009; 29: 3276-3287
- Astrocytes and disease: A neurodevelopmental perspective.Genes Dev. 2012; 26: 891-907
- Glial reduction in the subgenual prefrontal cortex in mood disorders.Proc Natl Acad Sci U S A. 1998; 95: 13290-13295
- Reduced glial cell density and neuronal size in the anterior cingulate cortex in major depressive disorder.Arch Gen Psychiatry. 2001; 58: 545-553
- A morphometric study of glia and neurons in the anterior cingulate cortex in mood disorder.J Affect Disord. 2011; 133: 328-332
- Morphometric evidence for neuronal and glial prefrontal cell pathology in major depression.Biol Psychiatry. 1999; 45: 1085-1098
- Reductions in neuronal and glial density characterize the dorsolateral prefrontal cortex in bipolar disorder.Biol Psychiatry. 2001; 49: 741-752
- Oligodendroglial density in the prefrontal cortex in schizophrenia and mood disorders: A study from the Stanley Neuropathology Consortium.Schizophr Res. 2004; 67: 269-275
- Reduced neuronal size and glial cell density in area 9 of the dorsolateral prefrontal cortex in subjects with major depressive disorder.Cerebral Cortex. 2002; 12: 386-394
- Astrocyte decrease in the subgenual cingulate and callosal genu in schizophrenia.Eur Arch Psychiatry Clin Neurosci. 2013; 263: 41-52
- Glial reduction in amygdala in major depressive disorder is due to oligodendrocytes.Biol Psychiatry. 2004; 55: 563-569
- Low glial numbers in the amygdala in major depressive disorder.Biol Psychiatry. 2002; 52: 404-412
- A putative functional role for oligodendrocytes in mood regulation.Trans Psychiatry. 2012; 2: e109
- Immunological aspects in the neurobiology of suicide: elevated microglial density in schizophrenia and depression is associated with suicide.J Psychiatr Res. 2008; 42: 151-157
- The immune theory of psychiatric diseases: A key role for activated microglia and circulating monocytes.J Leukoc Biol. 2012; 92: 959-975
- Neither major depression nor glucocorticoid treatment affects the cellular integrity of the human hippocampus.Eur J Neurosci. 2001; 14: 1603-1612
- Immunohistochemical localization of phosphorylated glial fibrillary acidic protein in the prefrontal cortex and hippocampus from patients with schizophrenia, bipolar disorder, and depression.Brain Behav Immun. 2001; 15: 388-400
- Disease-specific alterations in frontal cortex brain proteins in schizophrenia, bipolar disorder, and major depressive disorder. The Stanley Neuropathology Consortium.Mol Psychiatry. 2000; 5: 142-149
- Age-dependent reductions in the level of glial fibrillary acidic protein in the prefrontal cortex in major depression.Neuropsychopharmacology. 2004; 29: 2088-2096
- Amygdala astrocyte reduction in subjects with major depressive disorder but not bipolar disorder.Bipolar Disord. 2010; 12: 541-549
- Glial fibrillary acidic protein is reduced in cerebellum of subjects with major depression, but not schizophrenia.Schizophr Res. 2004; 69: 317-323
- Glial fibrillary acidic protein immunoreactivity in the prefrontal cortex distinguishes younger from older adults in major depressive disorder.Biol Psychiatry. 2000; 48: 861-873
- Altered cortical glutamatergic and GABAergic signal transmission with glial involvement in depression.Proc Natl Acad Sci U S A. 2005; 102: 15653-15658
- Altered expression of glutamate signaling, growth factor, and glia genes in the locus coeruleus of patients with major depression.Mol Psychiatry. 2011; 16: 634-646
- Histone methylation and decreased expression of TrkB.T1 in orbital frontal cortex of suicide completers.Mol Psychiatry. 2009; 14: 830-832
- Dysfunction of astrocyte connexins 30 and 43 in dorsal lateral prefrontal cortex of suicide completers.Biol Psychiatry. 2011; 70: 312-319
- Astroglial plasticity in the hippocampus is affected by chronic psychosocial stress and concomitant fluoxetine treatment.Neuropsychopharmacology. 2006; 31: 1616-1626
- Female early adult depression results in detrimental impacts on the behavioral performance and brain development in offspring.CNS Neurosci Ther. 2012; 18: 461-470
- Chronic psychosocial stress and citalopram modulate the expression of the glial proteins GFAP and NDRG2 in the hippocampus.Psychopharmacology (Berl). 2012; 224: 209-222
- Brain-derived neurotrophic factor (BDNF) infusion restored astrocytic plasticity in the hippocampus of a rat model of depression.Neurosci Lett. 2011; 503: 15-19
- Long-term effects of early life deprivation on brain glia in Fischer rats.Brain Res. 2007; 1142: 119-126
- Glial loss in the prefrontal cortex is sufficient to induce depressive-like behaviors.Biol Psychiatry. 2008; 64: 863-870
- Glial pathology in an animal model of depression: Reversal of stress-induced cellular, metabolic and behavioral deficits by the glutamate-modulating drug riluzole.Mol Psychiatry. 2010; 15: 501-511
- Region specific decrease in glial fibrillary acidic protein immunoreactivity in the brain of a rat model of depression.Neuroscience. 2009; 159: 915-925
- Gap junction dysfunction in the prefrontal cortex induces depressive-like behaviors in rats.Neuropsychopharmacology. 2012; 37: 1305-1320
- Chronic restraint stress decreases glial fibrillary acidic protein and glutamate transporter in the periaqueductal gray matter.Neuroscience. 2012; 223: 209-218
- Clinical studies implementing glutamate neurotransmission in mood disorders.in: Moghaddam B. Wolf M.E. Glutamate and Disorders of Cognition and Motivation. New York Academy of Sciences, New York2003: 292-308
- Glial and glutamatergic markers in depression, alcoholism, and their comorbidity.J Affect Disord. 2010; 127: 230-240
- Antidepressant-like properties of oral riluzole and utility of incentive disengagement models of depression in mice.Psychopharmacology (Berl). 2012; 219: 805-814
- Reduced expression of glutamate transporters vGluT1, EAAT2 and EAAT4 in learned helpless rats, an animal model of depression.Neuropharmacology. 2010; 58: 465-473
- Riluzole normalizes early-life stress-induced visceral hypersensitivity in rats: Role of spinal glutamate reuptake mechanisms.Gastroenterology. 2010; 138: 2418-2425
- Role of astrocytes and altered regulation of spinal glutamatergic neurotransmission in stress-induced visceral hyperalgesia in rats.Am J Physiol Gastrointest Liver Physiol. 2011; 301: G580-G589
- Blockade of astrocytic glutamate uptake in rats induces signs of anhedonia and impaired spatial memory.Neuropsychopharmacology. 2010; 35: 2049-2059
- Blockade of astrocytic glutamate uptake in the prefrontal cortex induces anhedonia.Neuropsychopharmacology. 2012; 37: 2467-2475
- Glia mechanisms in mood regulation: A novel model of mood disorders.Psychopharmacology (Berl). 2007; 191: 55-65
- Synaptic versus extrasynaptic NMDA receptor signalling: Implications for neurodegenerative disorders.Nat Rev Neurosci. 2010; 11: 682-696
- Synaptic and extrasynaptic NMDA receptors are gated by different endogenous coagonists.Cell. 2012; 150: 633-646
- Transporters for L-glutamate: An update on their molecular pharmacology and pathological involvement.Br J Pharmacol. 2007; 150: 5-17
- Up-regulation of GLT-1 severely impairs LTD at mossy fibre—CA3 synapses.J Physiol. 2009; 587: 4575-4588
- Receptor actions of synaptically released glutamate: The role of transporters on the scale from nanometers to microns.Biophys J. 2008; 95: 4584-4596
- Na(+)-dependent, fluoxetine-sensitive serotonin uptake by astrocytes tissue-printed from rat cerebral cortex.J Neurosci. 1994; 14: 4972-4986
- Fluoxetine promotes gliogenesis during neural differentiation in mouse embryonic stem cells.J Neurosci Res. 2010; 88: 3479-3487
- Chronic psychotropic drug treatment causes differential expression of connexin 43 and GFAP in frontal cortex of rats.Schizophr Res. 2008; 104: 127-134
- Profiling of behavioral changes and hippocampal gene expression in mice chronically treated with the SSRI paroxetine.Psychopharmacology (Berl). 2008; 200: 557-572
- Fluoxetine regulates the expression of neurotrophic/growth factors and glucose metabolism in astrocytes.Psychopharmacology (Berl). 2011; 216: 75-84
- Fluoxetine ameliorates behavioral and neuropathological deficits in a transgenic model mouse of alpha-synucleinopathy.Exp Neurol. 2012; 234: 405-416
- Requirement of AQP4 for antidepressive efficiency of fluoxetine: Implication in adult hippocampal neurogenesis.Neuropsychopharmacology. 2009; 34: 1263-1276
- Aquaporin-4 deficiency impairs synaptic plasticity and associative fear memory in the lateral amygdala: Involvement of downregulation of glutamate transporter-1 expression.Neuropsychopharmacology. 2012; 37: 1867-1878
- Fluoxetine treatment induces EAAT2 expression in rat brain.J Neural Transm. 2011; 118: 849-855
- Clomipramine treatment reversed the glial pathology in a chronic unpredictable stress-induced rat model of depression.Eur Neuropsychopharmacol. 2009; 19: 796-805
- Chronic clomipramine treatment restores hippocampal expression of glial cell line-derived neurotrophic factor in a rat model of depression.J Affect Disord. 2012; 141: 367-372
- Neuroprotective effects of riluzole in early phase Parkinson’s disease on clinically relevant parameters in the marmoset MPTP model.Neuropharmacology. 2012; 62: 1700-1707
- Riluzole and gabapentinoids activate glutamate transporters to facilitate glutamate-induced glutamate release from cultured astrocytes.Eur J Pharmacol. 2012; 677: 87-92
- Riluzole enhances the activity of glutamate transporters GLAST, GLT1 and EAAC1.Eur J Pharmacol. 2008; 578: 171-176
- Neuroprotective drug riluzole amplifies the heat shock factor 1 (HSF1)- and glutamate transporter 1 (GLT1)-dependent cytoprotective mechanisms for neuronal survival.J Biol Chem. 2011; 286: 2785-2794
- Riluzole in the treatment of mood and anxiety disorders.CNS Drugs. 2008; 22: 761-786
- Riluzole produces distinct anxiolytic-like effects in rats without the adverse effects associated with benzodiazepines.Neuropharmacology. 2012; 62: 2489-2498
- Riluzole rapidly attenuates hyperemotional responses in olfactory bulbectomized rats, an animal model of depression.Behav Brain Res. 2011; 216: 46-52
- Riluzole augmentation in treatment-refractory obsessive-compulsive disorder: A series of 13 cases, with long-term follow-up.J Clin Psychopharmacol. 2008; 28: 363-367
- Course of improvement in depressive symptoms to a single intravenous infusion of ketamine vs add-on riluzole: Results from a 4-week, double-blind, placebo-controlled study.Neuropsychopharmacology. 2012; 37: 1526-1533
- Riluzole for relapse prevention following intravenous ketamine in treatment-resistant depression: A pilot randomized, placebo-controlled continuation trial.Int J Neuropsychopharmacol. 2010; 13: 71-82
- Rapid enhancement of glutamatergic neurotransmission in bipolar depression following treatment with riluzole.Neuropsychopharmacology. 2010; 35: 834-846
- Chronic riluzole treatment increases glucose metabolism in rat prefrontal cortex and hippocampus.J Cereb Blood Flow Metab. 2008; 28: 1892-1897
- Beta-lactam antibiotics offer neuroprotection by increasing glutamate transporter expression.Nature. 2005; 433: 73-77
- Up-regulation of GLT1 expression increases glutamate uptake and attenuates the Huntington’s disease phenotype in the R6/2 mouse.Neuroscience. 2008; 153: 329-337
- The beta-lactam antibiotic, ceftriaxone, dramatically improves survival, increases glutamate uptake and induces neurotrophins in stroke.J Hypertens. 2008; 26: 2426-2435
- Ceftriaxone, a beta-lactam antibiotic, reduces ethanol consumption in alcohol-preferring rats.Alcohol Alcohol. 2011; 46: 239-246
- Ceftriaxone restores glutamate homeostasis and prevents relapse to cocaine seeking.Biol Psychiatry. 2010; 67: 81-84
- Infusion of gliotoxins or a gap junction blocker in the prelimbic cortex increases alcohol preference in Wistar rats.J Psychopharmacol. 2009; 23: 550-557
- Antidepressant-like effects of ceftriaxone in male C57BL/6J mice.Biol Psychiatry. 2007; 61: 250-252
- mTOR-dependent synapse formation underlies the rapid antidepressant effects of NMDA antagonists.Science. 2010; 329: 959-964
- Involvement of AMPA receptor in both the rapid and sustained antidepressant-like effects of ketamine in animal models of depression.Behav Brain Res. 2011; 224: 107-111
- mTOR activation is required for the antidepressant effects of mGluR(2)/(3) blockade.Int J Neuropsychopharmacol. 2012; 15: 429-434
- Involvement of the mammalian target of rapamycin signaling in the antidepressant-like effect of group II metabotropic glutamate receptor antagonists.Neuropharmacology. 2011; 61: 1419-1423
- Elevated level of metabotropic glutamate receptor 2/3 in the prefrontal cortex in major depression.Prog Neuropsychopharmacol Biol Psychiatry. 2010; 34: 279-283
Article info
Publication history
Accepted:
March 13,
2013
Received in revised form:
March 9,
2013
Received:
December 13,
2012
Identification
Copyright
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