2007 Fiscal Year Final Research Report Summary
Study of the molecular mechanism of synaptogenesis using withanolides, novel anti-dementia drugs
| Project/Area Number |
17500249
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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 |
Neurochemistry/Neuropharmacology
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| Research Institution | University of Toyama |
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Principal Investigator |
TOHDA Chihiro University of Toyama, Institute of Natural Medicine Research Center for Ethnomedicine Division of Biofunctional Evaluation, Assistant Professor (10272931)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Withanoside IV / Sominone / Memory improvement / Dendrite / RET / ACK1 / Neuronal network / Spinal cord injury |
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| Research Abstract |
Oral administration of withanoside IV (10 μmol/kg/day), an isolated compound from roots of Withania somnifera significantly improved memory deficits in Aβ(25-35)-injected (25 nmol, i.c.v.) mice and prevented loss of axons, dendrites, and synapses. The treatment with withanoside IV could enhance the object recognition memory in normal mice. In spinal cord injured mice, per oral treatment with withanoside IV (10 μmol/kg/day, for 21 days) improved locomotor functions in mice, and increased axonal density and the peripheral nervous system myelin level.
Sominone, an aglycone of withanoside IV, was identified as the main metabolite after oral administration of withanoside IV. Sominone (1 μM) induced axonal and dendritic regeneration and synaptic reconstruction significantly in cultured rat cortical neurons damaged by 10 μM Aβ(25-35).
To clarify the molecular mechanism of sominone, we identified receptors or associated molecules in primary cultured neurons, which were phosphorylated by sominone stimulation using phosphorylation antibody arrays. The level of phosphorylated RET increased in microglias and neurons. The level of phosphorylated ACK1 increased in neurons. Knockdown experiments using siRNA showed that both RET and ACK1 were involved in dedritic extension. These results suggest that roles of RET and ACK1 as key molecules for reconstruction of the neuronal
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[Journal Article] 鬱金類生薬の基原と品質.2007
Author(s)
小松かつ子、佐々木陽平、東田千尋、田中謙
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Journal Title
Foods & Food Ingredients Journal of Japan 212
Pages: 345-356.
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Influence of Amla(Emblica officinalis Gaertn.)on Hypercholesterolemia and Lipid Peroxidation in Cholesterol-Fed Rats2005
Author(s)
Kim, H.J., Yokozawa, T., Kim, H.Y., Tohda, C., Rao, T.P., Juneja, L.R
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Journal Title
J. Nutr. Sci. Vitaminol 51
Pages: 413-418
Description
「研究成果報告書概要(欧文)」より
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[Presentation] The effect of Wen-Pi-Tang on disease progression of amyotrophic lateral sclerosis model mice2008
Author(s)
Sekiya, M., Tahara, A. Ichiyanagi, T., Ikeshiro, Y., Tohda, C., Yokozawa, T
Organizer
The 128th Annual Meeting of the Pharmaceutical Society of Japan
Place of Presentation
Yokohama
Year and Date
20080326-28
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Metabolite 1 of protopanaxadiol-type saponins, an axonal regenerative factor, stimulates teneurin-2 followed by PI3-kinase cascade2005
Author(s)
Nakanishi, R., Tohda, C., Hashimoto, I., Komatsu, K., Yokozawa, T
Organizer
The 48th Annual Meeting of The Japanese Society for Neurochemistry
Place of Presentation
Fukuoka
Year and Date
20050928-29
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Evaluation of Amula using aged rats2005
Author(s)
Kim, H., Satoh, A. Tohda, C., Okubo, T., Junesia, L.R., Yokozawa, T
Organizer
The 22nd Annual Meeting of Medical and Pharmaceutical Society for WAKAN-YAKU
Place of Presentation
Tokyo
Year and Date
20050820-21
Description
「研究成果報告書概要(欧文)」より
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[Book] コーヒーの科学と機能2006
Author(s)
東田千尋, 小松かつ子, 中村憲夫, 服部征雄
Total Pages
214
Publisher
アイ・ケイコーポレーション
Description
「研究成果報告書概要(和文)」より
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