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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 Promote Inflammation in Idiopathic Inflammatory Myopathies
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“One hypothesis to explain this result is that TLR4 ligands are present in the pathological CNS and thus could regulate CNS microglia activation [9,10,15].”
BackgroundInfluentialImpact of Exercise on Innate Immunity in Multiple Sclerosis Progression and Symptomatology
Barry, A., Cronin, O., Ryan, A., Sweeney, B. J., Yap, S. M., O’Toole, O., Allen, A. P., Clarke, G. A., O’Halloran, K. D., & Downer, E. J. (2016) · Frontiers in Physiology · doi:10.3389/fphys.2016.00194 · Cited by 42
“…and TLR4, by poly(I:C) and LPS respectively, leads to microglial activation and consequently stimulates secretion of cytokines IL-12, TNF α , IL-6, IL-10 and chemokine CXCL-10 (a chemoattractant for pro-inflammatory T cells), which are strongly associated with MS pathogenesis (Jack et al., 2005).”
Microglia have a more extensive and divergent response to interferon‐α compared with astrocytes
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“In humans and rodents, cultured primary astrocytes and microglia have been shown to produce IFN-I when treated with poly (I:C), a synthetic analog of dsRNA (Carpentier et al., 2005; Jack et al., 2005; McKimmie & Fazakerley, 2005; Olson & Miller, 2004; Rivieccio et al., 2006; Town, Jeng, Alexopoulou, Tan, & Flavell, 20…”
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“Human astrocytes were found to express TLR3, both at the cell surface and in the intracellular compartment (Jack et al., 2005).”
BackgroundRole of alarmins in poststroke inflammation and neuronal repair
Sakai, S., & Shichita, T. (2022) · Seminars in Immunopathology · doi:10.1007/s00281-022-00961-5 · Cited by 39
“Astrocytes have been reported to express TLR1-9 [99, 100].”
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“The expression of TLRs in human astrocytes, however, is more restricted with only TLR 3 mRNA detected at intermediate levels; mRNA for TLRs 1, 2, 4, 5, and 9 were detectable but were low, and TLRs 6, 7, 8, and 10 mRNA expression was found to be rare to undetectable [33].”
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“In addition, poly (I:C) activation induces CXCL-10 production [92].”
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“The LPS stimulus on microglia is mediated by Toll-like receptors 1–9 (TLR), especially TLR2 (13).”
BackgroundUnique Contribution of Haptoglobin and Haptoglobin Genotype in Aneurysmal Subarachnoid Hemorrhage
Blackburn, S., Kumar, P. T., McBride, D. W., Zeineddine, H. A., Leclerc, J. L., Choi, H. A., Dash, P. K., Grotta, J. C., Aronowski, J. A., Cardenas, J. C., et al. (2018) · Frontiers in Physiology · doi:10.3389/fphys.2018.00592 · Cited by 39
“TLR4 (and other family members such as TLR2) can be activated by a number of ligands including heme and other components released by SAH (Lee and Lee, 2002; Jack et al., 2005).”
Molecular Mechanism Involved in the Pathogenesis of Early-Onset Epileptic Encephalopathy
Vitaliti, G., Pavone, P., Marino, S., Saporito, M. A. N., Corsello, G., & Falsaperla, R. (2019) · Frontiers in Molecular Neuroscience · doi:10.3389/fnmol.2019.00118 · Cited by 36
“As a result, one of the NMDA receptor subunits is phosphorylated leading to calcium influx into neurons and increasing cellular excitability (Kigerl et al., 2007).”
BackgroundInfluentialMicroglia in Neurodegenerative Events—An Initiator or a Significant Other?
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“In human microglia isolated from autopsy material, expression of TLR2 and TLR3 mRNA and protein has been detected with only mRNA levels for TLR4 and not protein [72].”
BackgroundBobyn, J., Mangano, E. N., Gandhi, A., Nelson, E., Moloney, K., Clarke, M., & Hayley, S. P. (2012) · Journal of Neuroinflammation · doi:10.1186/1742-2094-9-86 · Cited by 37
“These data also indicate that the duration of the augmented microglial response induced by pre-treatment with a TLR3 agonist (poly(I:C)) pre-treatment followed by paraquat administration exceeded what we previously with TLR4 stimulation (using LPS) performed before the pesticide [12].”
InfluentialBhargavan, B., Woollard, S. M., & Kanmogne, G. D. (2015) · Cellular Signalling · doi:10.1016/j.cellsig.2015.11.005 · Cited by 38
“However, the localization of TLRs vary amongst cell types; in many cells TLR3 is located intracellularly on endosomes, but in human astrocytes TLR3 is expressed both intracellularly and on the cell surface [5].”
Li, Y., Qin, X., Kuang, F., Wu, R. X., Duan, X., Ju, G., & Wang, B. (2008) · Journal of Neuroscience Research · doi:10.1002/jnr.21810 · Cited by 36
“TLR4 serves as a specific receptor for lipopolysaccharide (LPS), and ligation of TLR4 can activate microglia and astrocytes to produce proinflammatory cytokines, proteases, eicosanoids, and reactive oxygen and nitrogen species (Jack et al., 2005; Krasowska-Zoladek et al., 2007; Konat et al., 2008).”
BackgroundInhibition of cathepsin X reduces the strength of microglial-mediated neuroinflammation
Pišlar, A. H., Nedeljković, B. B., Zidar, N., & Kos, J. (2016) · Neuropharmacology · doi:10.1016/j.neuropharm.2016.11.019 · Cited by 36
“MAPKs play important roles in modulating the expression of the pro-inflammatory response in LPS-stimulated microglia (Kim et al., 2004; Jack et al., 2005).”
BackgroundLalancette–Hébert, M., Faustino, J. V., Thammisetty, S. S., Chip, S., Vexler, Z. S., & Križ, J. (2017) · Brain Behavior and Immunity · doi:10.1016/j.bbi.2017.05.020 · Cited by 36
“…that it is becoming increasingly clear that innate immune system activation can modulate postnatal brain development (Bsibsi et al., 2002; Jack et al., 2005; Yuan et al., 2010) and that timely modulation of innate immunity is instrumental in the early brain homeostasis and brain…”
Interferon‐β regulates the production of IL‐10 by toll‐like receptor‐activated microglia
Lobo‐Silva, D., Carriche, G. M., Castro, A. G., Roque, S., & Saraiva, M. (2017) · Glia · doi:10.1002/glia.23172 · Cited by 35
“The production of IL-10 by TLR-activated microglia is well documented (Butchi, Du, & Peterson, 2010; Jack et al., 2005; Ledeboer et al., 2002; Mizuno, Sawada, Marunouchi, & Suzumura, 1994; Olson & Miller, 2004).”
MicroRNA-210 regulates the metabolic and inflammatory status of primary human astrocytes
Kieran, N. W., Suresh, R., Dorion, M., MacDonald, A., Blain, M., Wen, D., Fuh, S.-C., Ryan, F., Diaz, R. J., Stratton, J. A., et al. (2022) · Journal of Neuroinflammation · doi:10.1186/s12974-021-02373-y · Cited by 37
“RNA extraction and RT‐qPCR for in vitro samples RNA extraction and reverse transcription of in vitro samples were performed as described above, with the modification that random hexaprimers were used instead of specific primers during the reverse transcription [20].”
BackgroundMethodAslani, M., Mortazavi‐Jahromi, S. S., & Mirshafiey, A. (2021) · Immunology Letters · doi:10.1016/j.imlet.2021.07.004 · Cited by 36
Sun, Q., Dai, Y., Zhang, X., Hu, Y.-C., Zhang, D.-D., Li, W., Zhang, X., Zhu, J., Zhou, M., & Hang, C. (2013) · Brain Research · doi:10.1016/j.brainres.2013.05.010 · Cited by 36
Blood–Brain Barrier Promotes Differentiation of Human Fetal Neural Precursor Cells
Chintawar, S., Cayrol, R., Antel, J. P., Pandolfo, M., & Prat, A. (2009) · Stem Cells · doi:10.1002/stem.25 · Cited by 36
Th1 Polarization of CD4+ T Cells by Toll-Like Receptor 3-Activated Human Microglia
Jack, C. S., Arbour, N., Blain, M., Meier, U., Prat, A., & Antel, J. P. (2007) · Journal of Neuropathology & Experimental Neurology · doi:10.1097/nen.0b013e3181492a7 · Cited by 36
“Recent findings have highlighted a role for TLRs in the activation of autoreactive T cells (30, 31) and the ability for TLRs to trigger the switch from autoreactivity to autoimmunity (32, 33).”
BackgroundMethodResultInfluentialRajalakshmy, A. R., Malathi, J., & Madhavan, H. N. (2015) · PLoS ONE · doi:10.1371/journal.pone.0125419 · Cited by 38
“Microglia express functionally active TLR receptors, TLR1 to TLR9 [18].”
BackgroundCavaleri, F. (2015) · Medical Hypotheses · doi:10.1016/j.mehy.2015.10.009 · Cited by 36
Gooshe, M., Abdolghaffari, A. H., Gambuzza, M. E., & Rezaei, N. (2014) · Reviews in the Neurosciences · doi:10.1515/revneuro-2014-0026 · Cited by 36
Sanders, M. S., van Well, G. T. J., Ouburg, S., Morré, S. A., & van Furth, A. M. (2011) · Genes and Immunity · doi:10.1038/gene.2011.20 · Cited by 35
“TLRs are a major group of PRRs and are also expressed by cells in the CNS, especially on microglia and astrocytes, endogenous cells in the CNS and key players in the immune response in this compartment [79].”
BackgroundYang, Y.-F., Chen, Z., Hu, S.-L., Hu, J., Li, B., Li, J.-T., Wei, L., Qian, Z.-M., Lin, J.-K., Feng, H., et al. (2011) · Neuroscience · doi:10.1016/j.neuroscience.2011.08.059 · Cited by 34
Mindin is a critical mediator of ischemic brain injury in an experimental stroke model
Wang, L., Lu, Y., Zhang, X., Zhang, Y., Jiang, D., Dong, X., Deng, S., Li, Y., Guan, Y., Zhu, L., et al. (2013) · Experimental Neurology · doi:10.1016/j.expneurol.2013.01.022 · Cited by 34
Han, B., Lü, Y., Zhao, H., Wang, Y., Li, L., & Wang, T. (2015) · PubMed Central · Cited by 34
Ullah, I., Choe, Y., Khan, M., Bharti, D., Shivakumar, S. B., Lee, H., Son, Y., Shin, Y., Lee, S., Park, B.-W., et al. (2018) · Scientific Reports · doi:10.1038/s41598-018-34151-x · Cited by 33
Immunomodulatory role of the extracellular matrix protein tenascin-C in neuroinflammation
Wiemann, S., Reinhard, J., & Faissner, A. (2019) · Biochemical Society Transactions · doi:10.1042/bst20190081 · Cited by 34
Wiemann, S., Reinhard, J., Reinehr, S., Cibir, Z., Joachim, S. C., & Faissner, A. (2020) · Frontiers in Immunology · doi:10.3389/fimmu.2020.566279 · Cited by 33
“Astrocytes as well as microglia express the toll-like receptor 4 (TLR4) and its expression is maintained by the extracellular environment (112, 113).”
BackgroundWang, H.-H., Hsieh, H., & Yang, C. (2010) · Journal of Neuroinflammation · doi:10.1186/1742-2094-7-84 · Cited by 35
“In astrocytes of the CNS, TLR signaling has been shown to be involved in brain inflammatory changes [13,14], accompanied by up-regulation of several genes with pro-inflammatory and pro-apoptotic capabilities [11,15,16].”
BackgroundYang, J., Su, J., Wan, F., Yang, N., Jiang, H., Fang, M., Xiao, H., Wang, J., & Tang, J. (2017) · Experimental and Therapeutic Medicine · doi:10.3892/etm.2017.4614 · Cited by 35
“Within the brain, TLR4 is mainly located on glial cells, including microglia, astrocytes and oligodendrocytes (14).”
BackgroundSanders, M. S., van Well, G. T. J., Ouburg, S., Morré, S. A., & van Furth, A. M. (2012) · BMC Infectious Diseases · doi:10.1186/1471-2334-12-112 · Cited by 33
“TLR9 is present in phagocytosing microglia and antigen presenting astrocytes inside the CNS, cells responsible for adequate immune responses in this compartment [11].”
BackgroundHaziak, K., Herman, A. P., Wojtulewicz, K., Pawlina, B., Paczesna, K., Bochenek, J., & Tomaszewska-Zaremba, D. (2018) · Journal of Animal Science and Biotechnology/Journal of animal science and biotechnology · doi:10.1186/s40104-018-0267-8 · Cited by 33
Morzaev, D., Nicholson, J. D., Caspi, T., Weiss, S., Hochhauser, E., & Goldenberg‐Cohen, N. (2015) · Clinical and Experimental Ophthalmology · doi:10.1111/ceo.12521 · Cited by 33
Chen, M., Luo, C., Peñalva, R. G., & Xu, H. (2013) · Investigative Ophthalmology & Visual Science · doi:10.1167/iovs.12-10888 · Cited by 33
Addiction: A dysregulation of satiety and inflammatory processes
Harricharan, R., Abboussi, O., & Daniels, W. M. U. (2017) · Progress in brain research · doi:10.1016/bs.pbr.2017.07.012 · Cited by 35
“TLRs predominantly use an MyD88-dependent pathway, which elicits downstream neuroinflammatory signaling cascades, culminating in the activation of transcription factors and consequently producing inflammatory cytokines and chemokines (Jack et al., 2005; Lehnardt, 2010).”
BackgroundTLR-4-Dependent and -Independent Mechanisms of Fetal Brain Injury in the Setting of Preterm Birth
Breen, K. E., Brown, A. G., Burd, I. D., Chai, J., Friedman, A., & Elovitz, M. A. (2012) · Reproductive Sciences · doi:10.1177/1933719112438439 · Cited by 32
“Our results also confirm other findings that demonstrate the robust presence of TLR-4 on microglia and astrocytes alone.(76) In previous studies, stimulation of quiescent microglia with LPS elicited a heightened immune response.”
ResultPuy, V., Darwiche, W., Trudel, S., Gomila, C., Lony, C., Puy, L., Lefèbvre, T., Vitry, S., Boullier, A., Karim, Z., et al. (2018) · Glia · doi:10.1002/glia.23335 · Cited by 32
“In fact, TLR4 expression in the brain is mainly restricted to glial cells (Jack et al., 2005), including microglia and astrocytes.”
BackgroundLipopolysaccharide and hypoxia/ischemia induced IL-2 expression by microglia in neonatal brain
Girard, S., Larouche, A., Kadhim, H. J., Rola‐Pleszczynski, M., Gobeil, F., & Sébire, G. (2008) · Neuroreport · doi:10.1097/wnr.0b013e3283036e88 · Cited by 32
“Some arguments suggest that microglia might also be a source of IL-2, especially in response to lipopolysaccharide (LPS) or H/I: (i) expression of a LPS receptor, toll-like receptor 4, on microglial cell [5], (ii) intracerebral detection of IL-2 transcripts [6–8], (iii) similarities between microglial cells and dendri…”
BackgroundA novel anti-neuroinflammatory pyridylimidazole compound KR-31360
Ock, J., Kim, S., Yi, K. Y., Kim, N.-J., Han, H. S., Cho, J., & Suk, K. (2009) · Biochemical Pharmacology · doi:10.1016/j.bcp.2009.09.026 · Cited by 32
“It is known that microglia express TLRs 1–9 [8] and some of these receptors are related to microglial activation and neurotoxicity [1].”
BackgroundKubesova, A., Tejkalová, H., Syslová, K., Kačer, P., Vondroušová, J., Tylš, F., Fujáková, M., Páleníček, T., & Horáček, J. (2015) · PLoS ONE · doi:10.1371/journal.pone.0115439 · Cited by 31
Wang, X., Yu, H. Q., Wang, C., Liu, Y., You, J., Wang, P., Xu, G., Shen, H., Yao, H., Lan, X., et al. (2020) · Toxicology · doi:10.1016/j.tox.2020.152625 · Cited by 31
Syeda, S., Patel, A. K., Lee, T., & Hackam, A. S. (2015) · Experimental Neurology · doi:10.1016/j.expneurol.2015.02.027 · Cited by 31
Park, S. Y., Bae, Y., Ko, M. J., Lee, S. J., & Choi, Y. W. (2013) · Molecular Nutrition & Food Research · doi:10.1002/mnfr.201300445 · Cited by 31
Su, W., Ju, J., Gu, M., Wang, X., Liu, S., Yu, J., & Mu, D.-L. (2023) · Journal of Neuroinflammation · doi:10.1186/s12974-023-02786-x · Cited by 33
“CNS Central nervous system E protein SARS-CoV-2 envelope protein SPT Sucrose preference test FST Forced swimming test TST Tail suspension test OM Olfactory measurement LAA L-α-Aminoadipate PAMPs Pathogen-associated molecular patterns TLR2 Toll-like receptor 2 TLRs Toll-like receptors Supplementary Information The onli…”
BackgroundInfluential
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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