Cited by 175Neuroinflammation and Neurodegeneration MechanismsAcute Ischemic Stroke ManagementTraumatic Brain Injury and Neurovascular Disturbances

mTOR Signaling Inhibition Modulates Macrophage/Microglia-Mediated Neuroinflammation and Secondary Injury via Regulatory T Cells after Focal Ischemia

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Xie, Luokun, Sun, Fen, Wang, Jixian, Mao, XiaoOu, Xie, Lin, Yang, Shao-Hua, Su, Dong-Ming, Simpkins, James W +2 more·2014·The Journal of Immunology

Abstract

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”

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  1. [16]Shichita T Sugiyama Y Ooboshi H Sugimori H Nakagawa R Takada I Iwaki T Okada Y Iida M Cua DJ Iwakura Y Yoshimura A Pivotal role of cerebral interleukin-17-producing gammadeltaT cells in the delayed phase of ischemic brain injury Nature medicine 2009 15 946 950 19648929
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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
Venue
The Journal of Immunology
Published
2014-06
Volume
192
Issue
12
Pages
6009-6019
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
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
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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