Abstract
Major depressive disorder (MDD) is a severe psychiatric illness that is associated with significant morbidity and mortality. Despite advances in the treatment of major depression, one-third of depressed patients fail to respond to conventional antidepressant medication. One pathophysiologic mechanism hypothesized to contribute to treatment resistance in depression is inflammation. Inflammation has been linked to depression by a number of putative mechanisms involving perfusion deficits that can trigger microglial activation and subsequent neuroinflammation in the elderly. However, the pathophysiological mechanisms remain to be further elucidated. This review focusses on recent studies addressing the complex relationships between depression, aging, inflammation and perfusion deficits in the elderly. We expect that a better understanding of neuroinflammatory mechanisms associated with age-related diseases may lead to the discovery of new biomarkers of MDD and development of new therapeutic interventions.
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Abbreviations
- CNS:
-
Central Nervous System
- CX3CL1:
-
Fractalkine
- CX3CR1:
-
Fractalkine receptor
- CR3:
-
Complement receptor 3
- C3:
-
Complement 3
- CD11b:
-
Cluster of Differentiation molecule 11b
- CD18:
-
Cluster of Differentiation molecule 18
- CRPs:
-
C reactive protein
- CAA:
-
Cerebral angiopathy
- CBF:
-
Cerebral blood flow
- eIF4B:
-
Eukaryotic translation initiation factor 4B
- IL6:
-
Interleukin 6
- IL-8:
-
Interleukin 6
- IFN-alpha:
-
Interferon-alpha
- IL-1β:
-
Interleukin 1 beta
- IL1ra:
-
Interleukin 1 receptor alpha
- IFN-alpha:
-
Interferon-alpha
- LLD:
-
Late-life depression
- MDD:
-
Major depressive disorder
- NMDA:
-
N-methyl-d-aspartate receptor
- mTOR:
-
Mammalian target of rapamycin
- mGluR5:
-
Metabotropic Glutamate receptor subtype 5
- NR2A:
-
NMDA receptor 2A
- NR2B:
-
NMDA receptor 2A
- PSD:
-
Post-stroke depression
- PSD-95:
-
Postsynaptic density 95 kDa proteins
- p70S6K:
-
Phosphoprotein-70 ribosomal protein S6 kinase
- p-eIF4B:
-
Phosphorylated-eukaryotic initiation factor 4B
- TNF-alpha:
-
Tumor Necrosis Factor-alpha
- TRD:
-
Treatment-resistant depression
- Mac-13:
-
Macrophage-13 antigen
- PFC:
-
Prefrontal cortex
- WMH:
-
White matter hyperintensities
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Acknowledgments
This research was supported by a grant from UEFISCDI for AMB, Grant No PNII-ID-FL-2011-2; PN-II-ID-PCE-2011-3-0848.
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Popa-Wagner, A., Buga, A.M., Tica, A.A. et al. Perfusion deficits, inflammation and aging precipitate depressive behaviour. Biogerontology 15, 439–448 (2014). https://doi.org/10.1007/s10522-014-9516-1
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DOI: https://doi.org/10.1007/s10522-014-9516-1