Isoflavones prevent endoplasmic reticulum stress-mediated neuronal degeneration by inhibiting tau hyperphosphorylation in SH-SY5Y cells.

Abstract:

:Several studies have demonstrated a protective effect of estrogen against the risk of developing neurodegenerative diseases; however, the molecular mechanisms involved have not been fully addressed. Isoflavones have been proposed as potential alternatives to estrogen replacement therapy. Therefore, in the present study, we investigated effects of isoflavones on cell death and tau phosphorylation in SH-SY5Y human neuroblastoma cells. Cells were treated with tunicamycin (TM) to induce endoplasmic reticulum (ER) stress-mediated toxicity, which is involved in development of neurodegenerative diseases. Treatment of cells with either 17beta-estradiol or isoflavones (either genistein or daidzein) significantly protected cells against cell death. The protective effect against cell death was blocked by a specific estrogen receptor blocker, ICI 182,780, suggesting that isoflavones protect against cell death via estrogen receptor-dependent pathways. Isoflavones also suppressed ER stress as determined by decreased expressions of the immunoglobulin binding protein (BiP) mRNA, spliced X-box binding protein-1 (Xbp-1) mRNAs, and C/EBP homologous protein (CHOP). TM activated glycogen synthase kinase 3beta (GSK3beta), a kinase involved in tau phosphorylation; in contrast, isoflavones inactivated GSK3beta and decreased tau hyperphosphorylation. In conclusion, our results clearly demonstrate that isoflavones prevent ER stress-mediated neurotoxicity by inhibiting tau hyperphosphorylation in SH-SY5Y cells.

journal_name

J Med Food

authors

Park YJ,Jang YM,Kwon YH

doi

10.1089/jmf.2008.1069

subject

Has Abstract

pub_date

2009-06-01 00:00:00

pages

528-35

issue

3

eissn

1096-620X

issn

1557-7600

journal_volume

12

pub_type

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