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Abstract Title:

Nobiletin, a flavone from Citrus depressa, induces gene expression and increases the protein level and activity of neprilysin in SK-N-SH cells.

Abstract Source:

Can J Physiol Pharmacol. 2014 May ;92(5):351-5. Epub 2014 Mar 7. PMID: 24784468

Abstract Author(s):

Hironori Fujiwara, Junko Kimura, Masahiro Sakamoto, Akihito Yokosuka, Yoshihiro Mimaki, Kiyoshi Murata, Kikuji Yamaguchi, Yasushi Ohizumi

Article Affiliation:

Hironori Fujiwara

Abstract:

Neprilysin (NEP) is one of the candidate amyloidβ protein (Aβ) degrading enzymes affecting brain Aβ clearance. This enzyme declines in the brain with age, which leads to the increased Aβ deposition in Alzheimer's disease (AD). Pharmacological activation of NEP during the aging process, therefore, represents a potential strategy to prevent thedevelopment of AD. To examine the influence of nobiletin on neprilysin activity, we measured cellular NEP activity in SK-N-SH cells. Moreover, NEP expression was examined by using reverse transcription - polymerase chain reaction and Western blotting. Measurement of cellular NEP activity showed that nobiletin stimulated this in a dose- and time-dependent manner in SK-N-SH cells. Moreover, nobiletin increased the expression of NEP mRNA, and then the levels of NEP protein, also in a dose- and time-dependent manner. Our findings showed that nobiletin promoted NEP gene and protein expression, resulting in enhancement of cellular NEP activity in SK-N-SH cells. This compound could be a novel Aβ-degrading compound for use in the development of disease-modifying drugs to prevent and (or) cure AD.

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Sayer Ji
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