mTOR Signaling Inhibition Modulates Macrophage/Microglia-Mediated Neuroinflammation and Secondary Injury via Regulatory T Cells after Focal Ischemia
Open accessAbstract
Signaling by the mammalian target of rapamycin (mTOR) plays an important role in the modulation of both innate and adaptive immune responses. However, the role and underlying mechanism of mTOR signaling in poststroke neuroinflammation are largely unexplored. In this study, we injected rapamycin, a mTOR inhibitor, by the intracerebroventricular route 6 h after focal ischemic stroke in rats. We found that rapamycin significantly reduced lesion volume and improved behavioral deficits. Notably, infiltration of γδ T cells and granulocytes, which are detrimental to the ischemic brain, was profoundly reduced after rapamycin treatment, as was the production of proinflammatory cytokines and chemokines by macrophages and microglia. Rapamycin treatment prevented brain macrophage polarization toward the M1 type. In addition, we also found that rapamycin significantly enhanced anti-inflammation activity of regulatory T cells (Tregs), which decreased production of proinflammatory cytokines and chemokines by macrophages and microglia. Depletion of Tregs partially elevated macrophage/microglia-induced neuroinflammation after stroke. Our data suggest that rapamycin can attenuate secondary injury and motor deficits after focal ischemia by enhancing the anti-inflammation activity of Tregs to restrain poststroke neuroinflammation.
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BMP9, MyD88, and mTOR were previously involved in restricting amyloidosis, microglial response to pathogens, and pro-inflammatory microglia.
“which were previously involved in restricting amyloidosis56, microglial response to pathogens57, and pro-inflammatory microglia58”
From Transcriptional signature in microglia associated with Aβ plaque phagocytosis (2021) · cites this paper as [58]
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Immune cell regulation of glia during CNS injury and disease
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Modulators of microglia activation and polarization in ischemic stroke
Jiang, C., Wu, W., Deng, Y.-H., & Ge, J.-W. (2020) · Molecular Medicine Reports · doi:10.3892/mmr.2020.11003 · Cited by 355 · see citing works
“…was observed to recruit cd8 + γδ T cells to the ischemic brain, which was identified to be the primary factor aggravating brain infarction (32,33). in fact, besides ischemic stroke, M1 microglia activation occurs in multiple other neurological diseases; for example, in an RD1 mouse model…”
Xu, X., Gao, W., Li, L., Hao, J.-H., Yang, B., Wang, T., Li, L., Bai, X.-S., Li, F., Ren, H., et al. (2021) · Journal of Neuroinflammation · doi:10.1186/s12974-021-02174-3 · Cited by 253 · see citing works
Self-citationThe Involvement and Therapy Target of Immune Cells After Ischemic Stroke
Jian, Z., Liu, R., Zhu, X., Smerin, D., Zhong, Y., Gu, L., Fang, W., & Xiong, X. (2019) · Frontiers in Immunology · doi:10.3389/fimmu.2019.02167 · Cited by 232 · see citing works
“Inhibition of mTORC1 pathway by everolimus reduced microglia polarizing to pro-inflammatory M1 phenotype, alleviated secondary injury and improved motor functions, which directly acts of microglia and macrophages (146, 147) (Table 3).”
BackgroundWang, Y., Tian, M., Tan, J.-Y., Pei, X., Lu, C., Xin, Y., Deng, S.-X., Zhao, F., Gao, Y.-Q., & Gong, Y. (2022) · Journal of Neuroinflammation · doi:10.1186/s12974-022-02438-6 · Cited by 205 · see citing works
“AMPK activation (phosphorylation of α subunit at thr172) is suggested to alleviate inflammation and promote microglial/macrophage polarization to the M2-phenotype [30, 31].”
BackgroundNguyen, H. M., Grössinger, E. M., Horiuchi, M., Davis, K. W., Jin, L., Maezawa, I., & Wulff, H. (2017) · Glia · doi:10.1002/glia.23078 · Cited by 178 · see citing works
“Resting, or more appropriately termed “surveillant” microglia continuously survey their environment with fine cellular processes (Nimmerjahn et al., 2005).”
BackgroundMethodFunctional Role of Regulatory Lymphocytes in Stroke
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Paradoxical changes in innate immunity in aging: recent progress and new directions
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“[40] and age-associated cardiac dysfunction [41].”
Inflammatory aspects of epileptogenesis: contribution of molecular inflammatory mechanisms
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“In addition, reduction of microglia-mediated neuroinflammation has been suggested to involve mTOR pathway (100).”
BackgroundLi, D., Wang, C.-J., Yao, Y., Chen, L., Liu, G., Zhang, R., Liu, Q., Shi, F.-D., & Hao, J. (2016) · The FASEB Journal · doi:10.1096/fj.201600495r · Cited by 147 · see citing works
The potential role of necroptosis in inflammaging and aging
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“• Mammalian target of rapamycin (mTOR) pathway is a known regulator of immune responses, and inhibition of the mTORC1 pathway pharmacologically or genetically prevents microglial polarization toward the M1 pro-inflammatory phenotype in the context of ischemic stroke (Li et al., 2016; Xie et al., 2014).”
Goldshmit, Y., Kanner, S., Zacs, M., Frisca, F., Pinto, A., Currie, P., & Pinkas-Kramarski, R. (2015) · Molecular and cellular neurosciences · doi:10.1016/j.mcn.2015.04.006 · Cited by 121 · see citing works
Peripheral immune cells infiltrate into sites of secondary neurodegeneration after ischemic stroke
Jones, K., Maltby, S., Plank, M. W., Kluge, M. G., Nilsson, M., Foster, P. S., & Walker, F. R. (2017) · Brain Behavior and Immunity · doi:10.1016/j.bbi.2017.09.006 · Cited by 127 · see citing works
Dynamics of T cell responses after stroke.
Gill, D., & Veltkamp, R. (2016) · Current opinion in pharmacology (Print) · doi:10.1016/j.coph.2015.09.009 · Cited by 116 · see citing works
“Indeed, the therapeutic benefit of harnessing Treg mediated protection has been explored with rapamycin, an inhibitor of mammalian target of rapamycin (mTOR) signalling [34].”
BackgroundA New Model of Cuprizone-Mediated Demyelination/Remyelination
Sachs, H. H., Bercury, K., Popescu, D., Narayanan, S., & Macklin, W. B. (2014) · ASN Neuro · doi:10.1177/1759091414551955 · Cited by 115 · see citing works
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“Compared with direct adoptive Treg cell transfer, which is technically demanding and time consuming,(10,11) pharmacological amplification of endogenous Treg may be more feasible in acute stroke.(11,12) The superagonistic CD28 monoclonal antibody (CD28SA) activates T cells without T cell receptor engagement.”
BackgroundResultKrämer, T. J., Hack, N., Brühl, T. J., Menzel, L., Hummel, R., Griemert, E., Klein, M., Thal, S., Bopp, T., & Schäfer, M. K. E. (2019) · Journal of Neuroinflammation · doi:10.1186/s12974-019-1550-0 · Cited by 99 · see citing works
Anti-inflammatory treatments for stroke: from bench to bedside
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Experimental ischemic stroke induces long-term T cell activation in the brain
Xie, L.-K., Li, W.-J., Hersh, J., Liu, R., & Yang, S.-H. (2018) · Journal of Cerebral Blood Flow and Metabolism · doi:10.1177/0271678x18792372 · Cited by 91 · see citing works
“Isolation of immune cells from the brains and spleens was performed at day 3 or one month post-MCAO as published earlier.(27,29) Briefly, mouse cerebral hemispheres and spleens were cut into 1 mm(3) pieces before digestion for 45min at 37 C with digestion buffer (RPMI 1640 medium supplemented with 10% fetal bovine ser…”
MethodSelf-citationYe, J., Jiang, Z., Chen, X., Liu, M., Li, J., & Liu, N. (2017) · Journal of Neurochemistry · doi:10.1111/jnc.14042 · Cited by 92 · see citing works
“Also, rapamycin has been found as a direct inducer of M1 polarization of macrophages and microglia, it also strongly enhances Treg activity, which in turn restrains the inflammatory response of macrophages and microglia (Xie et al. 2014).”
BackgroundBeccari, S., Sierra-Torre, V., Valero, J., Pereira-Iglesias, M., García-Zaballa, M., Soria, F. N., De Las Heras-Garcia, L., Carretero-Guillen, A., Capetillo-Zarate, E., Domercq, M., et al. (2023) · Autophagy · doi:10.1080/15548627.2023.2165313 · Cited by 89 · see citing works
“systemic administration of rapamycin may modulate peripheral immune cell inflammatory profile and activities, including their migration to the CNS, indirectly affecting microglial functions [66].”
BackgroundRegulatory T Cells in Post-stroke Immune Homeostasis
Liesz, A., & Kleinschnitz, C. (2016) · Translational Stroke Research · doi:10.1007/s12975-016-0465-7 · Cited by 97 · see citing works
“exacerbation of stroke outcome after Treg depletion also observed an associated increase in neuroinflammatory biomarkers [17, 21, 38].”
InfluentialGabandé‐Rodríguez, E., Heras, M. M. G. D. L., & Mittelbrunn, M. (2019) · Cells · doi:10.3390/cells9010082 · Cited by 96 · see citing works
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“For M1 makers, we found that the expression level of iNOS (P < 0.01; n = 6) was significantly increased at 1 day post ICH (Figure 1A), while those of IL-1β (P < 0.05; n = 6), TNF-α (P < 0.05; n = 6), and IL-6 (P < 0.01; n = 6) were increased at 3 h post ICH (Figures 1B–”
BackgroundInfluentialCai, W., Liu, S., Hu, M.-Y., Sun, X.-B., Qiu, W., Zheng, S.-G., Hu, X.-M., & Lu, Z.-Q. (2018) · Translational Stroke Research · doi:10.1007/s12975-018-0662-7 · Cited by 79 · see citing works
Duan, M., Xu, Y., Li, Y., Feng, H., & Chen, Y. (2024) · Journal of Neuroinflammation · doi:10.1186/s12974-024-03101-y · Cited by 82 · see citing works
“In terms of neuroprotective effects, researchers have demonstrated in stroke models that the mTOR inhibitor rapamycin protects neurons through the anti-inflammatory effects of Tregs [295, 296].”
BackgroundRapamycin prevents cerebral stroke by modulating apoptosis and autophagy in penumbra in rats
Wu, M.-L., Zhang, H.-D., Kai, J.-J., Zhu, F., Dong, J.-Y., Xu, Z.-W., Wong, M., & Zeng, L.-H. (2017) · Annals of Clinical and Translational Neurology · doi:10.1002/acn3.507 · Cited by 73 · see citing works
“Currently, systemic thrombolysis with recombinant intravenous tissue plasminogen activator (rtPA) remains a frequently used therapy which can improve clinical outcome of patients with acute ischemic stroke.(3,4) However, rtPA has an increased risk of hemorrhage beyond a few hours of poststroke, and only less than 4% o…”
BackgroundShi, X.-D., Xu, L., Doycheva, D., Tang, J.-P., Yan, M., & Zhang, J. H. (2017) · Journal of Cerebral Blood Flow and Metabolism · doi:10.1177/0271678x16656201 · Cited by 72 · see citing works
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“It has been shown that blockade of mTORC1 signaling enabled microglia to polarize toward the M2 phenotype to exert anti-inflammatory effects after stroke [47, 48].”
BackgroundKrystal, J., Kaye, A. P., Jefferson, S., Girgenti, M., Wilkinson, S. T., Sanacora, G., & Esterlis, I. (2023) · Proceedings of the National Academy of Sciences of the United States of America · doi:10.1073/pnas.2305772120 · Cited by 69 · see citing works
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“Loss of Tregs function has been shown to result in M1 macrophage polarization and inflammation [51, 52].”
BackgroundThe Role of Gamma-Delta T Cells in Diseases of the Central Nervous System
Wo, J., Zhang, F., Li, Z., Sun, C., Zhang, W.-C., & Sun, G. (2020) · Frontiers in Immunology · doi:10.3389/fimmu.2020.580304 · Cited by 80 · see citing works
“Hence, gd T cells and IL-17 should be considered potential therapeutic targets to decrease secondary inflammation after ischemic brain injury (105, 106).”
BackgroundHost Resistance and Immune Aging
Bandaranayake, T., & Shaw, A. C. (2016) · Clinics in Geriatric Medicine · doi:10.1016/j.cger.2016.02.007 · Cited by 85 · see citing works
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Positive effects of intermittent fasting in ischemic stroke
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“…cell adhesion molecules (E-selectin, ICAM-1 and VCAM-1) in rodent brains following cerebral ischemia (Aljada et al., 2006; Harari and Liao, 2010; Howard et al., 1998; Lee et al., 2015; Nam et al., 2009; Sanacora et al., 2014; Supanc et al., n.d.; Xing and Remick, 2007; Zampetaki et al., 2004).”
The Effect of A2A Receptor Antagonist on Microglial Activation in Experimental Glaucoma.
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Self-citationCD8 signaling in microglia/macrophage M1 polarization in a rat model of cerebral ischemia
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Rapamycin in ischemic stroke: Old drug, new tricks?
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Impact of aging immune system on neurodegeneration and potential immunotherapies
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Self-citationEverolimus is better than rapamycin in attenuating neuroinflammation in kainic acid-induced seizures
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“Rapamycin (or sirolimus), the prototype mTOR inhibitor, enhanced the anti-inflammatory activities of regulatory T cells, decreased the production of proinflammatory cytokines and chemokines by macrophages and microglia, and thus attenuated secondary injury after focal ischemia in rats [18].”
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“Treatment with rapamycin or its derivatives everolimus or sirolimus could revert medial cerebral artery occlusion (MCAO)–induced increases of cytokines and/or chemokines, as well as promote anti-inflammatory microglial polarization (222, 223).”
Treg cell: Critical Role of Regulatory T-cells in Depression.
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“inhibition of macrophage- and microglia-mediated proinflammatory cytokines and chemokines in ischemic stroke rats (Xie et al., 2014).”
BackgroundInfluentialYou, W.-C., Wang, Z., Li, H., Shen, H.-T., Xu, X., Jia, G., & Chen, G. (2016) · Journal of Neurological Sciences · doi:10.1016/j.jns.2016.06.021 · Cited by 48
mTOR pathway: A potential therapeutic target for spinal cord injury
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“Several studies found that drugs which downregulate M1 macrophage/microglia and/or upregulate M2 macrophage/microglia polarization are beneficial for MCAO mice to recover from ischemic/reperfusion injury (Jin et al., 2014; Xie et al., 2014).”
BackgroundEssential Role of mTORC1 in Self-Renewal of Murine Alveolar Macrophages
Deng, W., Yang, J., Lin, X., Shin, J., Gao, J., & Zhong, X. (2016) · The Journal of Immunology · doi:10.4049/jimmunol.1501845 · Cited by 47 · see citing works
mTOR signaling in immune cells and its implications for cancer immunotherapy.
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Melatonin receptor agonist ramelteon attenuates mouse acute and chronic ischemic brain injury
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“mTOR signaling was reported to regulate neuroinflammation [33, 34], which is involved in the pathological process of cerebral ischemia [35].”
BackgroundRegulatory T lymphocytes as a therapy for ischemic stroke
Wang, M., Thomson, A., Yu, F., Hazra, R., Junagade, A., & Hu, X.-M. (2022) · Seminars in Immunopathology · doi:10.1007/s00281-022-00975-z · Cited by 40 · see citing works
“Rapamycin Rat Focal ischemic stroke Enhanced anti-inflammatory activity of Tregs; reduced lesion volume; decreased production of pro-inflammatory cytokines by macrophages and microglia [148]”
BackgroundZhang, T., Guo, J., Gu, J., Chen, K., Li, H.-L., & Wang, J.-L. (2019) · Oxidative Medicine and Cellular Longevity · doi:10.1155/2019/7861290 · Cited by 40 · see citing works
Self-citationAutophagy Modulators and Neuroinflammation
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“also demonstrate that enhancing the anti-inflammation activity of Tregs can attenuate secondary injury and motor deficits after focal ischemia by to restrain poststroke neuroinflammation [29, 30].”
BackgroundFilho, C. D. D. M., Kappeler, L., Dupont, J., Solinc, J., Villapol, S., Denis, C., Nosten‐Bertrand, M., Billard, J., Blaise, A., Tronche, F., et al. (2016) · Journal of Cerebral Blood Flow & Metabolism · doi:10.1177/0271678x15626718 · Cited by 45 · see citing works
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E‐selectin targeted immunoliposomes for rapamycin delivery to activated endothelial cells
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“Recent studies have highlighted the pivotal role of the mTOR pathways in inflammatory disorders (Cejka et al., 2010; Xie et al., 2014; Weichhart et al., 2015; Li et al., 2016).”
BackgroundInhibition of the Akt1-mTORC1 Axis Alters Venous Remodeling to Improve Arteriovenous Fistula Patency
Guo, X.-J., Fereydooni, A., Isaji, T., Gorecka, J., Liu, S., Hu, H., Ono, S., Alozie, M., Lee, S.-R., Taniguchi, R., et al. (2019) · Scientific Reports · doi:10.1038/s41598-019-47542-5 · Cited by 35
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“The inhibition of mTORC1 is also believed to prevent the microglial/macrophage phenotype toward to a detrimental state, significantly enhancing beneficial anti-inflammatory activity and decreasing the production of pro-inflammatory cytokines and chemokines [33].”
BackgroundFriend or foe: the dichotomous impact of T cells on neuro-de/re-generation during aging
Coder, B., Wang, W., Wang, L., Wu, Z., Zhuge, Q., & Su, D. (2016) · Oncotarget · doi:10.18632/oncotarget.12572 · Cited by 35 · see citing works
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“[22].”
The role of hypernitrosylation in the pathogenesis and pathophysiology of neuroprogressive diseases
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“However, other investigators have suggested that treatment with rapamycin, and therefore inhibition of mTOR, is neuroprotective (Guo et al., 2014; Qi et al., 2014; Xie et al., 2014).”
BackgroundDuan, Z., Su, Z., Wang, H.-S., & Pang, X. (2018) · Molecular Pain · doi:10.1177/1744806918769426 · Cited by 28
“Rapamycin, the prototype of selective mTOR inhibitor, enhances the anti-inflammatory activities of regulatory T cells and decreases the production of PICs and chemokines by macrophages in addition to other immune cells.(23) Recent studies have suggested the role of mTOR in regulating a number of inflammatory and autoi…”
BackgroundT-cell receptor signaling modulated by the co-receptors: Potential targets for stroke treatment.
Liu, Y., Chen, S., Liu, S., Wallace, K. L., Zille, M., Zhang, J., Wang, J., & Jiang, C. (2023) · Pharmacological Research · doi:10.1016/j.phrs.2023.106797 · Cited by 27 · see citing works
Self-citationBeneficial Effects of Resveratrol-Mediated Inhibition of the mTOR Pathway in Spinal Cord Injury
Zhou, J., Huo, X., Botchway, B. O. A., Xu, L.-Y., Meng, X., Zhang, S.-O., & Liu, X.-H. (2018) · Journal of Neural Transplantation and Plasticity · doi:10.1155/2018/7513748 · Cited by 27 · see citing works
Emerging Targets for Modulation of Immune Response and Inflammation in Stroke
Thapa, K., Shivam, K., Khan, H., Kaur, A., Dua, K., Singh, S. K., & Singh, T. G. (2023) · Neurochemical Research · doi:10.1007/s11064-023-03875-2 · Cited by 29 · see citing works
“CD28SA, an anti-CD28 antibody, has been shown to boost Treg cell numbers and proliferation [254, 256].”
BackgroundFDA-Approved Kinase Inhibitors in Preclinical and Clinical Trials for Neurological Disorders
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“It has been reported that treatment with rapamycin reduces infarct volume via inhibiting microglia-mediated proinflammatory activity after transient focal cerebral ischemia in rats (Xie et al., 2014).”
mTOR inhibition potentiates cytotoxicity of Vγ4 γδ T cells via up‐regulating NKG2D and TNF‐α
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Mammalian Target of Rapamycin at the Crossroad Between Alzheimer’s Disease and Diabetes
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“pathway plays an important part in ischemic stroke, and the inhibition of mTORC1 signaling may be a protective mechanism [14].”
Background
- Authors
- Xie, L., Sun, F., Wang, J., Mao, X., Xie, L., Yang, S.-H., Su, D.-M., Simpkins, J. W., Greenberg, D. A., & Jin, K.
- Affiliations
- Buck Institute for Research on Aging (US)
- University of North Texas Health Science Center (US)
- West Virginia University (US)
- Department of Pharmacology and Neuroscience, Institute for Aging and Alzheimer’s Disease Research, University of North Texas Health Science Center , Fort Worth, TX 76107
- Corresponding author
- Xie, Luokun
- Sun, Fen
- Wang, Jixian
- ORCID
- Sun, Fen
- Venue
- The Journal of Immunology
- Publisher
- Oxford University Press (OUP)
- Published
- 2014-06
- Volume
- 192
- Issue
- 12
- Pages
- 6009-6019
- ISSN
- 0022-1767 (ISSN-L)
- 1550-6606
- PMC
- PMC4128178
- OpenAlex
- W1618035875
- Cited by
- 175
- References
- 76
- Citations by year
- 2026: 4 · 2025: 9 · 2024: 6 · 2023: 19 · 2022: 11 · 2021: 26 · 2020: 12 · 2019: 19 · 2018: 15 · 2017: 18 · 2016: 21 · 2015: 12 · 2014: 2 · 2012: 1
- FWCI
- 9.20
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Journal of Immunology (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- The Research Repository @ WVU (West Virginia University) (submittedVersion)
- Funders
- University of North Texas
- National Institute on Aging (R01AG021980, AG21980, P01AG027956)
- National Institute of General Medical Sciences (U54GM104942)
- National Institute of Neurological Disorders and Stroke (NS57186, NS054651, NS054687, R01NS054687, R01NS057186, R01NS054651)
- Topics
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Health Sciences › Medicine › Epidemiology › Acute Ischemic Stroke Management
- Health Sciences › Medicine › Neurology › Traumatic Brain Injury and Neurovascular Disturbances
- Keywords
- mTOR signaling, rapamycin, focal ischemic stroke, regulatory T cells, macrophage polarization, microglia, γδ T cells, granulocytes, inflammatory cytokines, chemokines, secondary brain injury, motor impairment, intracerebroventricular administration
- MeSH terms
- Animals, Brain Ischemia, Immunosuppressive Agents, Inflammation, Macrophages, Male, Signal Transduction, Receptors, Antigen, T-Cell, gamma-delta, Rats, Sprague-Dawley, Microglia, Sirolimus, Stroke, T-Lymphocytes, Regulatory, Rats, TOR Serine-Threonine Kinases
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