2005 Fiscal Year Final Research Report Summary
Function of cytokine in the brain in manifestation of central fatigue and its involvement to the regulation of metabolism
| Project/Area Number |
16580097
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Food science
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| Research Institution | Kyoto University |
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Principal Investigator |
INOUE Kazuo Kyoto University, Graduate School of Agriculture, Associate Professor, 農学研究科, 助教授 (80213148)
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| Co-Investigator(Kenkyū-buntansha) |
KAWADA Teruo Kyoto University, Graduate School of Agriculture, Professor, 農学研究科, 教授 (10177701)
TUZUKI Satoshi Kyoto University, Graduate School of Agriculture, Asssitant Professor, 農学研究科, 助手 (50283651)
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| Project Period (FY) |
2004 – 2005
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| Keywords | central fatigue / TGF-beta / cytokine / matrix metalloproteinase / microdialysis |
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| Research Abstract |
1. Activation mechanism of latant-TGF-β in the brain
Because matrix metalloproteinases (MMP) are reported to be involved to activation of inacvtive latent-TGF-β, the activity of MMP in the brain were determined in the exercise which caused fatigue. Increases in the expression of MMP-9 were found after exercise in pons, medulla oblongata, mesencephalon, and diencephalon.
2. Expression sites of receptors for TGF-β in the rat brain.
Type 1 and type 2 receptor for TGF-β were found to be expressed in paraventricular nucleus of hypothalamus (PVH) in the brain by in situ hybridization and immunohistochemical staining.
3. Neurochemical studies of mechanism of TGF-β action in the brain
Measurements of the extracellular concentration of neurotransmitters with intracisternal administration of TGF-β were conducted in some regions of rat brain. Following changes were observed : increases in the extracellular concentrations of serotonin and noradrenaline in the ventromedial nucleus of hypothalamus (VMH), decreases in those of serotonin in lateral hypothalamic area (LHA) and medial prefrontal cortex (mPFC). No changes in the extracellular concentration of dopamine was found.
4. Mechanism of action of intracisternally administered TGF-β on peripheral tissues
Changes in concentrations of hormones (adrenalin, noradrenaline, insulin, glucagon, and leptin) in serum were measured. No changes was found in these hormones concentrations by intracisternal administration of TGF-b. However, this treatment caused increase in the activity of lipoprotein lipase (LPL) in skeletal muscles of hind legs. In addition, the concentrations of malonyl-CoA which is a key substance of fat metabolism decreased in the liver and red part of gastrocnemius muscle.
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