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TLR Signaling Tailors Innate Immune Responses in Human Microglia and Astrocytes
Open accessAbstract
The specific signals mediating the activation of microglia and astrocytes as a prelude to, or consequence of, CNS inflammation continue to be defined. We investigated TLRs as novel receptors mediating innate immune responses in human glial cells. We find that microglia express mRNA for TLRs 1-9, whereas astrocytes express robust TLR3, low-level TLR 1, 4, 5, and 9, and rare-to-undetectable TLR 2, 6, 7, 8, and 10 mRNA (quantitative real-time PCR). We focused on TLRs 3 and 4, which can signal through both the MyD88-dependent and -independent pathways, and on the MyD88-restricted TLR2. By flow cytometry, we established that microglia strongly express cell surface TLR2; TLR3 is expressed at higher levels intracellularly. Astrocytes express both cell surface and intracellular TLR3. All three TLRs trigger microglial activation upon ligation. TLR3 signaling induces the strongest proinflammatory polarizing response, characterized by secretion of high levels of IL-12, TNF-alpha, IL-6, CXCL-10, and IL-10, and the expression of IFN-beta. CXCL-10 and IL-10 secretion following TLR4 ligation are comparable to that of TLR3; however, other responses were lower or absent. TLR2-mediated responses are dominated by IL-6 and IL-10 secretion. Astrocytes respond to TLR3 ligation, producing IL-6, CXCL-10, and IFN-beta, implicating these cells as contributors to proinflammatory responses. Initial TLR-mediated glial activation also regulates consequent TLR expression; while TLR2 and TLR3 are subject to positive feedback, TLR4 is down-regulated in microglia. Astrocytes up-regulate all three TLRs following TLR3 ligation. Our data indicate that activation of innate immune responses in the CNS is not homogeneous but rather tailored according to cell type and environmental signal.
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“Concretely, TLR4 and TLR2 are associated with both neuro-inflammation and clearance of protein aggregates in neurodegenerative disorders (Jack et al., 2005).”
From The role of microglia in retinal neurodegeneration: Alzheimer’s disease, parkinson, and glaucoma. (2017) · cites this paper as Jack et al., 2005
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“Toll-like receptors (TLRs) play important roles in initiating immune responses; for example, TLR4 in the immune system binds to LPS to stimulate pro-inflammatory cytokine release (Jack et al., 2005; Takeuchi and Akira, 2010).”
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BackgroundDeciphering Human Cell-Autonomous Anti-HSV-1 Immunity in the Central Nervous System
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Shapiro, A. M., Jack, C. S., Lapierre, Y., Arbour, N., Bar‐Or, A., & Antel, J. P. (2006) · Archives of Neurology · doi:10.1001/archneur.63.9.1296 · Cited by 23
“We have previously shownthatastrocytesexpressrelativelyhigh levels of TLR3, which recognizes doublestranded RNA, a component of viruses.(1,4) Stimulation of this receptor activates the MyD88-dependentandMy88-independent intracellular signaling pathways, although cross talk may exist between them.”
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Telikani, Z., Monson, E. A., Hofer, M. J., & Helbig, K. J. (2022) · Frontiers in Immunology · doi:10.3389/fimmu.2022.1044721 · Cited by 23
“For instance, TLR 2 and TLR 3 are the prevalent TLRs in astrocytes and are both highly expressed in RNA and protein levels in human white matter samples and human astrocyte cultures of embryonic origin, respectively (53, 56), however, an alternate study reported TLR 2 mRNA level as negligible in astrocytes obtained fr…”
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“dsRNA binding to TLR3 initiates a signaling cascade causing IjBa phosphorylation and degradation leading to the nuclear translocation of NFjB and transcription of pro-inflammatory genes (Carpentier et al., 2005; Jack et al., 2005; Kim et al., 2008) including those displayed in our Results (Figs.”
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“Experimental support for considering these microglia as resting cells were lack of basic TNF-a release and negligible gene expression levels of TNF-a, IL-6, and IL-1b combined with a massive upregulation and secretion upon challenge with the standard proinflammatory molecule LPS, a response in accordance with the expr…”
BackgroundRNA Nanotherapeutics for the Amelioration of Astroglial Reactivity
Smith, J. A., Braga, A., Verheyen, J., Basilico, S., Bandiera, S., Alfaro‐Cervelló, C., Peruzzotti‐Jametti, L., Shu, D., Haque, F., Guo, P., et al. (2017) · Molecular Therapy — Nucleic Acids · doi:10.1016/j.omtn.2017.11.008 · Cited by 22
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“inflammatory potential on astrocytes [19, 20].”
Toll-Like Receptors (TLRs) and their potential therapeutic applications in diabetic neuropathy
Aghamiri, S. H., Komlakh, K., & Ghaffari, M. (2021) · International Immunopharmacology · doi:10.1016/j.intimp.2021.108398 · Cited by 22
Involvement of CLEC16A in Activation of Astrocytes After LPS Treated
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“phenotypes in the CNS inflammatory lesions that characterize the putative autoimmune disease multiple sclerosis (MS) [22, 23].”
Dias, A. T., de Castro, S. B. R., Alves, C. C. D. S., Evangelista, M. G., da Silva, L. C., Faza, D. R. D. L. R., Machado, M. A., Juliano, M. A., & Ferreira, A. P. (2018) · Inflammation Research · doi:10.1007/s00011-018-1146-7 · Cited by 21
“Previous studies report that TLR3 stimulation induces interferon regulatory factor (IRF)-3 activation, which increases the production of IFN-β and improves EAE [34].”
BackgroundNovel Analgesics with Peripheral Targets
Ciotu, C. I., & Fischer, M. J. M. (2020) · Neurotherapeutics · doi:10.1007/s13311-020-00937-z · Cited by 22
Toll-like Receptors in Viral Encephalitis
Gern, O. L., Mulenge, F., Pavlou, A., Ghita, L., Steffen, I., Stangel, M., & Kalinke, U. (2021) · Viruses · doi:10.3390/v13102065 · Cited by 24
Host immune responses in the central nervous system during fungal infections
Reyes, E. Y., & Shinohara, M. L. (2022) · Immunological Reviews · doi:10.1111/imr.13101 · Cited by 23
“TLRs in microglia— Microglia constitutively express Toll-like receptors (TLRs), such as TLR1–9, TLR11–13 in mice 72,73 and TLR1–10 in humans 74,75 , together with their adaptor proteins.”
Astrogliopathy and oligodendrogliopathy are early events in CNS demyelination
Zhang, F., Yao, S., Whetsell, W. O., & Sriram, S. (2013) · Glia · doi:10.1002/glia.22513 · Cited by 21
“However, upon ligation of the TLR’s, astrocytes have shown to increase TLR protein expression and the release of cytokines (Bsibsi et al., 2007; Jack et al., 2005).”
BackgroundZegenhagen, L., Kurhade, C., Koniszewski, N., Överby, A. K., & Kröger, A. (2016) · Cytokine & growth factor reviews · doi:10.1016/j.cytogfr.2016.03.006 · Cited by 20
Nalamolu, K. R., Smith, N. J., Chelluboina, B., Klopfenstein, J. D., Pinson, D. M., Wang, D. Z., Vemuganti, R., & Veeravalli, K. K. (2018) · Neuroscience · doi:10.1016/j.neuroscience.2018.01.014 · Cited by 21
Olsen, L. K., Cairns, A. G., Ådén, J., Moriarty, N., Cabré, S., Alamilla, V., Almqvist, F., Dowd, E., & McKernan, D. P. (2019) · Brain Behavior and Immunity · doi:10.1016/j.bbi.2019.04.036 · Cited by 21
Brain in flames – animal models of psychosis: utility and limitations
Wolf, S. A., Mattei, D., & Schweibold, R. (2015) · Neuropsychiatric Disease and Treatment · doi:10.2147/ndt.s65564 · Cited by 24
“153 It is known that microglia during fetal development are controlling and guiding neural precursor cells and axonal and dendritic outgrowth by active phagocytosis.”
van Strien, M. E., Mercier, D., Drukarch, B., Brevé, J. J. P., Poole, S., Binnekade, R., Bol, J. G. J. M., Blits, B., Verhaagen, J., & van Dam, A.-M. (2010) · Gene Therapy · doi:10.1038/gt.2010.8 · Cited by 21
Thrombin antithrombin complex and IL-18 serum levels in stroke patients
Piazza, O., Scarpati, G., Cotena, S., Lonardo, M. C., & Tufano, R. (2010) · Neurology International · doi:10.4081/ni.2010.e1 · Cited by 21
TLR-3 receptor activation protects the very immature brain from ischemic injury
Shi, H. R., Gabarin, N., Hickey, E. J., & Askalan, R. (2013) · Journal of Neuroinflammation · doi:10.1186/1742-2094-10-104 · Cited by 20
“In the human CNS, microglia express TLRs 1 to 9, astrocytes express robust TLR-3 and low-level TLRs 1,4,5,9 and oligodendrocytes express TLR-3 and TLR-2 [3,4].”
BackgroundInterleukin-18 in chronic pain: Focus on pathogenic mechanisms and potential therapeutic targets
Ju, J., Li, Z., Jia, X., Peng, X., Wang, J., & Gao, F. (2024) · Pharmacological Research · doi:10.1016/j.phrs.2024.107089 · Cited by 24
Synaptic abnormalities of mice lacking toll-like receptor (TLR)-9
Patel, V., Patel, A. M., & McArdle, J. J. (2016) · Neuroscience · doi:10.1016/j.neuroscience.2016.03.001 · Cited by 20
Fagbemi, A. O., Torrente, F., Puleston, J., Lakhoo, K., James, S. G., & MURCH, S. H. (2013) · Journal of Pediatric Gastroenterology and Nutrition · doi:10.1097/mpg.0b013e3182a86fd4 · Cited by 20
Taking a Toll on Self-Renewal: TLR-Mediated Innate Immune Signaling in Stem Cells
Alvarado, A. G., & Lathia, J. D. (2016) · Trends in Neurosciences · doi:10.1016/j.tins.2016.04.005 · Cited by 20
“coli LPS [7].”
BackgroundInfluentialThe Potential Therapeutic Role of the HMGB1-TLR Pathway in Epilepsy
Wang, S., Guan, Y., & Li, T. (2020) · Current Drug Targets · doi:10.2174/1389450121999200729150443 · Cited by 21
The Innate and Adaptive Immune Cells in Alzheimer’s and Parkinson’s Diseases
Huang, B., Zhenxin, Y., Chen, S., Tan, Z., Zong, Z., Zhang, H., & Xiong, X. (2022) · Oxidative Medicine and Cellular Longevity · doi:10.1155/2022/1315248 · Cited by 19
“In the context of AD and PD, some members of the Toll-like receptor (TLR) family, which can recognize protein aggregates in these diseases, are involved in the disease progression [31].”
BackgroundGlaucoma and microglia-induced neuroinflammation
Ishikawa, M., Izumi, Y., Sato, K., Sato, T., Zorumski, C. F., Kunikata, H., & Nakazawa, T. (2023) · Frontiers in Ophthalmology · doi:10.3389/fopht.2023.1132011 · Cited by 31
“TLR4 is associated with both neuro-inflammation and clearance of protein aggregates in neurodegenerative disorders (32).”
BackgroundToll-Like Receptors in Brain Abscess
Esen, N., & Kielian, T. (2009) · Current topics in microbiology and immunology · doi:10.1007/978-3-642-00549-7_3 · Cited by 19
“…direct evidence for the presence of TLRs in astrocytes (Bsibsi et al. 2002 ; Bowman et al. 2003 ; Esen et al. 2004 ; Carpentier et al. 2005 ; Jack et al. 2005) ; however, the number of TLRs expressed is much lower compared to microglia, which may be explained by the fact that microglia are…”
BackgroundPodda, G., Nyirenda, M., Crooks, J. E., & Gran, B. (2013) · Journal of Neuroimmune Pharmacology · doi:10.1007/s11481-013-9483-3 · Cited by 19
“In cultures of human microglia, ligation of TLR4 by LPS or TLR3 by dsRNA induced the secretion of CXCL10, which is thought to attract T cells to MS lesions (Jack et al. 2005).”
Role of Infiltrating Microglia/Macrophages in Glioma
Catalano, M., D’Alessandro, G., Trettel, F., & Limatola, C. (2020) · Advances in experimental medicine and biology · doi:10.1007/978-3-030-30651-9_14 · Cited by 19
Vitamin D Regulates MerTK-Dependent Phagocytosis in Human Myeloid Cells
Clarke, J., Yaqubi, M., Futhey, N. C., Sedaghat, S., Baufeld, C., Blain, M., Baranzini, S. E., Butovsky, O., White, J. H., Antel, J. P., et al. (2020) · The Journal of Immunology · doi:10.4049/jimmunol.2000129 · Cited by 18
Rizzo, M. D., Crawford, R. B., Bach, A. P., Sermet, S., Amalfitano, A., & Kaminski, N. E. (2019) · Journal of Neuroimmunology · doi:10.1016/j.jneuroim.2019.576969 · Cited by 20
Cayrol, R., Haqqani, A. S., Ifergan, I., Dodelet-Devillers, A., & Prat, A. (2010) · Methods in molecular biology · doi:10.1007/978-1-60761-938-3_13 · Cited by 19
Principles of Astrogliopathology
Verkhratsky, A., Li, B., Scuderi, C., & Parpura, V. (2021) · Advances in Neurobiology · doi:10.1007/978-3-030-77375-5_3 · Cited by 21
“The PAMPs are exogenous agents associated with pathogens such as bacteria, viruses or prions; these factors stimulate Toll-like receptors (TLRs) widely expressed in astrocytes (Jack et al. 2005; Kielian 2006).”
BackgroundCarpenter, J. E., Clayton, A. C., Halling, K. C., Bonthius, D. J., Buckingham, E. M., Jackson, W., Dotzler, S. M., Card, J. P., Enquist, L. W., & Grose, C. F. (2015) · Journal of Virology · doi:10.1128/jvi.02389-15 · Cited by 18
“Instead, they participate in several functions, including energy metabolism, ion exchange, and glutamate homeostasis, as well as acting as sentinels for viral infection via their expression of the Toll-like receptor 3 (TLR3) (39, 40).”
BackgroundChoroidal Neovascular Membranes Express Toll-Like Receptor 3
Maloney, S., Antecka, E., Orellana, M. E., Fernandes, B. F., Odashiro, A. N., Eghtedari, M., & Burnier, M. N. (2010) · Ophthalmic Research · doi:10.1159/000313989 · Cited by 18
Nguyen, T. T. N., Seo, E., Choi, J., Le, O. T. T., Kim, J. Y., Jou, I., & Lee, S. Y. (2017) · Cellular Signalling · doi:10.1016/j.cellsig.2017.07.009 · Cited by 19
Phosphoinositide turnover in Toll-like receptor signaling and trafficking
Le, O. T. T., Nguyen, T. T. N., & Lee, S. Y. (2014) · BMB Reports · doi:10.5483/bmbrep.2014.47.7.088 · Cited by 18
“croglia and astrocytes express most TLRs and function as immune effector cells (33, 34).”
BackgroundTan, Q., Zhang, M., Geng, L., Xia, Z., Li, C., Usman, M., Du, Y., Wei, L., & Bi, H. (2018) · Toxicology and Applied Pharmacology · doi:10.1016/j.taap.2018.10.017 · Cited by 17
Li, X., Cudaback, E., Keene, C. D., BREYER, R. M., & Montine, T. J. (2011) · Glia · doi:10.1002/glia.21125 · Cited by 17
“…explored the activation of the TLRs known to be expressed functionally by microglia (Block et al., 2007) by ligands that have relative specificity at the concentrations used (Iliev et al., 2004; Jack et al., 2005; Olson and Miller, 2004; Park et al., 2006; Ribes et al., 2009; Shah et al., 2009).”
BackgroundGregus, A. M., Buczynski, M. W., Dumlao, D. S., Norris, P. C., Rai, G., Simeonov, A. M., Maloney, D. J., Jadhav, A., Xu, Q., Wei, S. C., et al. (2018) · Pain · doi:10.1097/j.pain.0000000000001373 · Cited by 17
Genetics of COVID ‐19 and myalgic encephalomyelitis/chronic fatigue syndrome: a systematic review
Tziastoudi, M., Cholevas, C., Stefanidis, I., & Theoharides, T. C. (2022) · Annals of Clinical and Translational Neurology · doi:10.1002/acn3.51631 · Cited by 19
Counting the Toll of Inflammation on Schizophrenia—A Potential Role for Toll-like Receptors
Patlola, S. R., Donohoe, G. J., & McKernan, D. P. (2023) · Biomolecules · doi:10.3390/biom13081188 · Cited by 18
“Stimulation studies demonstrate that human microglial cells from foetal cerebral tissue [39] responded to ligands that activate TLR2, 3, and 4 by releasing cytokines such as interleukin-6 (IL-6) and tumour necrosis factor-α (TNF-α), whereas astrocytes elicited a response only to polyinosinic:polycytidylic acid (poly I…”
BackgroundRole of toll-like receptor 2 in ischemic demyelination and oligodendrocyte death
Choi, J. Y., Cui, Y., Kang, Y. M., Kim, J., Lee, S. J., & Kim, B. G. (2014) · Neurobiology of Aging · doi:10.1016/j.neurobiolaging.2014.01.146 · Cited by 16
Jeon, N.-R., Koppula, S., Kim, B.-W., Park, S.-H., Lee, H. W., & Choi, D. (2010) · Journal of Pharmacological Sciences · doi:10.1254/jphs.09239fp · Cited by 16
Zhao, Y., Pu, D., Sun, Y., Chen, J., Luo, C., Wang, M., Zhou, J., Lv, A., Zhu, S., Liao, Z., et al. (2017) · Experimental Cell Research · doi:10.1016/j.yexcr.2017.12.030 · Cited by 16
Metadata
- Authors
- Jack, C. S., Arbour, N., Manusow, J., Montgrain, V., Blain, M., McCrea, E., Shapiro, A., & Antel, J. P.
- Affiliations
- Montreal Neurological Institute and Hospital (CA)
- Venue
- The Journal of Immunology
- Publisher
- Oxford University Press (OUP)
- Published
- 2005-10-01
- Volume
- 175
- Issue
- 7
- Pages
- 4320-4330
- ISSN
- 0022-1767 (ISSN-L)
- 1550-6606
- OpenAlex
- W2165413779
- Cited by
- 734
- References
- 46
- Citations by year
- 2026: 17 · 2025: 21 · 2024: 15 · 2023: 34 · 2022: 44 · 2021: 42 · 2020: 25 · 2019: 26 · 2018: 36 · 2017: 39 · 2016: 38 · 2015: 40 · 2014: 33 · 2013: 59 · 2012: 44
- FWCI
- 20.39
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Journal of Immunology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
- Keywords
- Toll-like receptors, microglia, astrocytes, glial activation, TLR3, TLR4, TLR2, MyD88 signaling, neuroinflammation, inflammatory cytokines, CXCL10, IL-10, interferon-beta, innate immunity
- MeSH terms
- Adult, Antigens, Differentiation, Astrocytes, Fetus, Humans, Immunity, Innate, Receptors, Immunologic, Signal Transduction, Interleukin-10, Microglia, Interleukin-12, Adaptor Proteins, Signal Transducing, Myeloid Differentiation Factor 88
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