Abstract
Bacterial meningitis is a life-threatening infection associated with cognitive impairment in many survivors. The pathogen invades the central nervous system (CNS) by penetrating through the luminal side of the cerebral endothelium, which is an integral part of the blood-brain barrier. The replication of bacteria within the subarachnoid space occurs concomitantly with the release of their compounds that are highly immunogenic. These compounds known as pathogen-associated molecular patterns (PAMPs) may lead to both an increase in the inflammatory response in the host and also microglial activation. Microglia are the resident macrophages of the CNS which, when activated, can trigger a host of immunological pathways. Classical activation increases the production of pro-inflammatory cytokines, chemokines, and reactive oxygen species, while alternative activation is implicated in the inhibition of inflammation and restoration of homeostasis. The inflammatory response from classical microglial activation can facilitate the elimination of invasive microorganisms; however, excessive or extended microglial activation can result in neuronal damage and eventually cell death. This review aims to discuss the role of microglia in the pathophysiology of bacterial meningitis as well as the process of microglial activation by PAMPs and by endogenous constituents that are normally released from damaged cells known as danger-associated molecular patterns (DAMPs).
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Abbreviations
- 17β‑HSD14:
-
17β‑hydroxysteroid dehydrogenase type 14
- AIM2:
-
Absent in melanoma
- AP-1:
-
Activator protein-1
- Arg1:
-
Arginase 1
- ASC:
-
Apoptosis-associated speck-like protein containing a caspase-recruitment domain
- ATP:
-
Adenosine 5′-triphosphate
- BBB:
-
Blood-brain-barrier
- CLRs:
-
c-type lectin receptors
- CNS:
-
Central nervous system
- CSF:
-
Cerebrospinal fluid
- CX3CL1:
-
Chemokine (C-X3-C motif) ligand 1
- CX3CR1:
-
Chemokine (C-X3-C motif) receptor 1
- DAMPs:
-
Damage-associated molecular patterns
- DHEA:
-
Dehydroepiandrosterone
- DNA:
-
Deoxyribonucleic acid
- ERβ:
-
Estrogen receptor beta
- FIZZ1:
-
Found in inflammatory zone 1
- GSA-IB4:
-
Griffonia simplicifolia isolectin-B4
- HMGB-1:
-
High mobility group box-1 protein
- HSP:
-
Heat shock protein
- Iba1:
-
Ionized calcium binding adaptor molecule 1
- IFN:
-
Interferon
- IGF-1:
-
Insulin-like growth factor 1
- IL:
-
Interleukin
- iNOs:
-
Nitric oxide synthase
- IRAK-4:
-
Interleukin-1 receptor-associated kinase 4
- IRF-3:
-
Interferon-regulatory factor 3
- JAK-1:
-
Receptor-Janus Kinase-1
- LPS:
-
Lipopolysaccharide
- M1:
-
Classical activation phenotype
- M2:
-
Alternative activation phenotype
- MDA:
-
Malondialdehyde
- MIP-2:
-
Macrophage inflammatory protein 2
- MyD88:
-
Myeloid differentiation factor 88
- NF-κB:
-
Nuclear transcription factor kappa factor B
- NLRP3:
-
Nucleotide-binding domain and leucine-rich repeat protein 3
- NLRs:
-
Nucleotide binding oligomerization domain-like receptors
- NO:
-
Nitric oxide
- NODs:
-
Nucleotide binding oligomerization domains
- O2 − :
-
Superoxide anion
- ONOO− :
-
Peroxynitrite formation
- P2X:
-
P2 purinergic receptor
- PAMPs:
-
Pathogen-associated molecular patterns
- PRRs:
-
Pattern-recognition receptors
- RAGE:
-
Receptor for advanced glycation end products
- RLRs:
-
RIG-I-like receptors
- STAT-3:
-
Activator of transcription-3
- TGF-β:
-
Transforming growth factor beta
- TLRs:
-
Toll-like receptors
- TNF:
-
Tumor necrosis factor
- TRAF:
-
Receptor-associated factor
- TRIF:
-
TIR-domain-containing adapter-inducing interferon-β
- Ym1:
-
Chitinase-3-like protein 3
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Acknowledgments
Research from the Center for Experimental Models in Psychiatry (USA) is supported by grants from the Department of Psychiatry and Behavioral Sciences, The University of Texas Medical School at Houston. Research from Laboratorio de Microbiologia Experimental and Laboratório de Neurociências (Brazil) is supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa e Inovação do Estado de Santa Catarina (FAPESC), and Universidade do Extremo Sul Catarinense (UNESC).
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Barichello, T., Generoso, J.S., Simões, L.R. et al. Role of Microglial Activation in the Pathophysiology of Bacterial Meningitis. Mol Neurobiol 53, 1770–1781 (2016). https://doi.org/10.1007/s12035-015-9107-4
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DOI: https://doi.org/10.1007/s12035-015-9107-4