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U18666A-mediated apoptosis in cultured murine cortical neurons : role of caspases, calpains and kinases

journal contribution
posted on 2006-10-01, 00:00 authored by C Koh, R Qi, D Qu, A Melendez, J Manikandan, B Bay, Wei DuanWei Duan, Steve Cheung
Studies have suggested that cholesterol imbalance in the brain might be related to the development of neurological disorders such as Alzheimer's disease and Niemann–Pick disease type C. Previously, we have reported that U18666A, a cholesterol transport-inhibiting agent, leads to apoptosis and intracellular cholesterol accumulation in primary cortical neurons. In this study, we examined the effects of U18666A-mediated neuronal apoptosis, and found that chronic exposure to U18666A led to the activation of caspases and calpains and hyperphosphorylation of tau. Tau hyperphosphorylation is regulated by several kinases that phosphorylate specific sites of tau in vitro. Surprisingly, the kinase activity of cyclin-dependent kinase 5 decreased in U18666A-treated cortical neurons whereas its protein level remained unchanged. The amount of glycogen synthase kinase 3 and mitogen-activated protein kinases were found to decrease in their phosphorylated states by Western blot analysis. Gene transcription was further studied using microarray analysis. Genes encoding for kinases and phosphatases were differentially expressed with most up-regulated and some down-regulated in expression upon U18666A treatment. The activation of cysteine proteases and cholesterol accumulation with tauopathies may provide clues to the cellular mechanism of the inhibition of cholesterol transport-mediated cell death in neurodegenerative diseases.

History

Journal

Cellular signalling

Volume

18

Issue

10

Pagination

1572 - 1583

Publisher

Elsvier Inc.

Location

Amsterdam, Netherlands

ISSN

0898-6568

eISSN

1873-3913

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2005, Elsevier Inc.