KMID : 1204320120280030155
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Laboratory Animal Research 2012 Volume.28 No. 3 p.155 ~ p.163
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Effects of Red Liriope platyphylla on NGF secretion ability, NGF receptor signaling pathway and ¥ã-secretase components in NSE/hAPPsw transgenic mice expressing Alzheimer's Disease
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Choi Sun-Il
Goo Jun-Seo Kim Ji-Eun Hwang In-Sik Lee Hye-Ryun Lee Young-Ju Son Hong-Joo Lee Hee-Seob Lee Jong-Sup Hwang Dae-Youn
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Abstract
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Liriope platyphylla (LP) has long been regarded as a curative herb for the treatment of diabetes, asthma, and neurodegenerative disorders. To examine the therapeutic effects of Red LP (RLP) manufactured by steaming process on neurodegenerative disorders, significant alteration of the key factors influencing Alzheimer's Disease (AD) was detected in NSE/hAPPsw transgenic (Tg) mice after RLP treatment. The concentration of nerve growth factor (NGF) in serum increased in RLP-treated NSE/hAPPsw Tg mice compared with vehicle-treated Tg mice. However, downstream effectors of the NGF receptor signaling pathway, including TrkA and p75NTR proteins, were suppressed in RLP-treated NSE/hAPPsw Tg mice. Especially, Tg mice showed decreased levels of TrkA, p75NTR, and RhoA expression. Production of A¥â-42 peptides was lower in RLP-treated NSE/hAPPsw Tg mice than in vehicle-treated Tg mice. Further, analysis of ¥ã-secretase components showed that A¥â-42 peptide expression was downregulated. Of the four components, the expression of APH-1 and Nicastrin (NCT) decreased in RLP-treated NSE/hAPPsw Tg mice, whereas expression of PS-2 and Pen-2 was maintained or increased within the same group. Overall, these results suggest that RLP can help relieve neurodegenerative diseases, especially AD, through upregulation of NGF secretion ability, activation of NGF signaling pathway, downregulation of A¥â-42 peptide deposition, and alteration of ¥ã-secretase components.
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KEYWORD
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Red L. platyphylla, NGF, NGF signaling pathway, A¥â-42, ¥ã-secretase
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