NGF-Dependent Activation of TrkA Pathway: A Mechanism for the Neuroprotective Effect of Troxerutin in D-galactose-treated Mice

Overview

Journal Brain Pathol

Date 2010 May 12

PMID 20456366

Citations 22

Authors

Jun Lu

Dong-Mei Wu

Bin Hu

Yuan-Lin Zheng

Zi-Feng Zhang

Yong-Jian Wang

Affiliations

Soon will be listed here.

Abstract

D-galactose-(D-gal)-treated mouse, with cognitive impairment, has been used for neurotoxicity investigation and anti-neurotoxicity pharmacology research. In this study, we investigated the mechanism underlying the neuroprotective effect of troxerutin. The results showed that troxerutin improved behavioral performance in D-gal-treated mice by elevating Cu, Zn-superoxide dismutases (Cu, Zn-SOD) activity and decreasing reactive oxygen species levels. Furthermore, our results showed that troxerutin significantly promoted nerve growth factor (NGF) mRNA expression which resulted in TrkA activation. On one hand, NGF/TrkA induced activation of Akt and ERK1/2, which led to neuronal survival; on the other hand, NGF/TrkA mediated CaMKII and CREB phosphorylation and increased PSD95 expression, which improved cognitive performance. However, the neuroprotective effect of troxerutin was blocked by treatment with K252a, an antagonist for TrkA. No neurotoxicity was observed in mice treated with K252a or troxerutin alone. In conclusion, administration of troxerutin to D-gal-injected mice attenuated cognitive impairment and brain oxidative stress through the activation of NGF/TrkA signaling pathway.

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