Functional analysis of TLR4-activated long-lived microglia and their neuroprotective effects.
Project/Area Number |
24590321
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
General pharmacology
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Research Institution | Hiroshima University |
Principal Investigator |
HIDE IZUMI 広島大学, 医歯薬保建学研究院(医), 助教 (20253073)
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Co-Investigator(Kenkyū-buntansha) |
SAKAI Norio 広島大学, 大学院医歯薬保建学研究院, 教授 (70263407)
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Project Period (FY) |
2012-04-01 – 2015-03-31
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Project Status |
Completed (Fiscal Year 2014)
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Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
|
Keywords | ミクログリア / トル様受容体4 / 生存 / 死細胞貪食 / 神経保護 / ATP / TLR4 / Toll様受容体4 |
Outline of Final Research Achievements |
Toll-like receptor 4 activation by lipopolysaccharide (LPS) induced both death and survival in rat primary cultured microglia. Here, we investigated the mechanism of survival and purinergic modulation of dead cell phagocytosis and cytokine production in TLR4-activated microglia. LPS stimulation drastically induced the production of GM-CSF and up-regulated GM-CSF receptor signaling in surviving microglia. In addition, LPS-stimulated surviving microglia became motile and actively engulfed dead cells possibly through up-regulated P2Y2 receptors. Furthermore, Adenosine A2a receptors up-regulated by LPS stimulation suppressed TNF production. Purinergic activation promoted a marked elevation of protective cytokines such as activin-A. LPS-stimulated microglia protected neuronal cells in co-culture system. Together, TLR-4-activated long-lived microglia produce GM-CSF as an autocrine survival factor and may acquire protective phenotype through up-regulation of specific purinergic receptors.
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Report
(4 results)
Research Products
(38 results)
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[Journal Article] Mutant gammaPKC that causes spinocerebellar ataxia type 14 upregulates Hsp70, which protects cells from the mutant's cytotoxicity.2013
Author(s)
Ogawa, K., Seki, T., Onji, T., Adachi, N., Tanaka, S., Hide, I., Saito, N., Sakai, N.
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Journal Title
Biochem. Biophys. Res. Commun.
Volume: 440
Issue: 1
Pages: 25-30
DOI
Related Report
Peer Reviewed
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[Journal Article] Effects of the Chemical Chaperone 4-Phenylbutylate on the Function of the Serotonin Transporter (SERT) Expressed in COS-7 Cells2013
Author(s)
Fujiwara, M., Yamamoto, H., Miyagi, T., Seki, T., Tanaka, S., Hide, I., Sakai, N.
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Journal Title
Journal of Pharmacological Sciences
Volume: 122
Issue: 2
Pages: 71-83
DOI
NAID
ISSN
1347-8613, 1347-8648
Related Report
Peer Reviewed
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[Journal Article] Establishment of a novel fluorescence-based method to evaluate chaperone-mediate autophagy in a singlz neuron2011
Author(s)
Seki, T., Ki Y., Tanaka, S., Dohi, E., Onji, T., Yamamoto, K., Seki T, Yoshino KI, Tanaka S, Dohi E, Onji T, Yamamoto K, Hide, I., Sakai, N. et al.
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Journal Title
PLoS ONE
Volume: 7
Issue: 2
Pages: e31232-e31232
DOI
Related Report
Peer Reviewed
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[Journal Article] Hypoxic stress activates chaperone-mediated autophagy and modulates neuronal cell survival2011
Author(s)
Dohi, E., Tanaka, S., Seki, T, m Miyagi, T., Hide, I., Sakai, N. et al.
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Journal Title
Neurochemistry International
Volume: 60
Issue: 4
Pages: 431-442
DOI
Related Report
Peer Reviewed
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[Presentation] Decreased expression of lysosomal-associated membrane protein type 2A is possibly associated with neuronal death following brain ischemia2013
Author(s)
Dohi, E., Tanaka, S., Seki, T., Hide, I., Matsumoto, M., Sakai, N.
Organizer
Neuroscience 2013
Place of Presentation
San Diego (USA)
Related Report
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