title: Effects of Red Liriope platyphylla on NGF secretion ability, NGF receptor signaling pathway and γ-secretase components in NSE/hAPPsw transgenic mice expressing Alzheimer's Disease.
abstract: 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 p75(NTR) proteins, were suppressed in RLP-treated NSE/hAPPsw Tg mice. Especially, Tg mice showed decreased levels of TrkA, p75(NTR), and RhoA expression. Production of Aβ-42 peptides was lower in RLP-treated NSE/hAPPsw Tg mice than in vehicle-treated Tg mice. Further, analysis of γ-secretase components showed that Aβ-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 Aβ-42 peptide deposition, and alteration of γ-secretase components.
authors.affiliation: College of Natural Resources & Life Science, Pusan National University, Miryang, Korea.
authors.forename: Sun-Il
authors.initials: SI
authors.lastname: Choi
authors.forename: Jun-Seo
authors.initials: JS
authors.lastname: Goo
authors.forename: Ji-Eun
authors.initials: JE
authors.lastname: Kim
authors.forename: In-Sik
authors.initials: IS
authors.lastname: Hwang
authors.forename: Hye-Ryun
authors.initials: HR
authors.lastname: Lee
authors.forename: Young-Ju
authors.initials: YJ
authors.lastname: Lee
authors.forename: Hong-Joo
authors.initials: HJ
authors.lastname: Son
authors.forename: Hee-Seob
authors.initials: HS
authors.lastname: Lee
authors.forename: Jong-Sup
authors.initials: JS
authors.lastname: Lee
authors.forename: Dae-Youn
authors.initials: DY
authors.lastname: Hwang
keywords: Aβ-42; NGF; NGF signaling pathway; Red L. platyphylla; γ-secretase