期刊
NEUROBIOLOGY OF DISEASE
卷 23, 期 1, 页码 1-10出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.nbd.2006.01.008
关键词
vitamin A deficiency; retinoic acid nuclear receptor (RAR); amyloid precursor protein (APP); beta-Site APP-cleaving enzyme (BACE); APP carboxy-terminal fragment (CTF); rat cerebral cortex
Recent data have revealed that disruption of vitamin A signaling observed in Alzheimer's disease (AD) leads to a deposition of beta-amyloid (A beta). The aim of this study was to precise the role of vitamin A and its nuclear receptors (RAR) in the processes leading to the AD deposits. Thus, the effect of vitamin A depletion and subsequent administration of retinoic acid (RA, the active metabolite of vitamin A) on the expression of RAR beta, and of proteins involved in amyloidogenic pathway, e.g., amyloid precursor protein (APP), beta-secretase enzyme (BACE), and APP carboxy-terminal fragment (APP-CTF) was examined in the whole brain, hippocampus, striatum, and cerebral cortex of rats. Rats fed a vitamin A-deprived diet for 13 weeks exhibited decreased amount of RAR beta, APP695, BACE, and of APP-CTF in the whole brain and in the cerebral cortex. Administration of RA is able to restore all expression. The results suggest that fine regulation of vitamin A mediated gene expression seems fundamental for the regulation of APP processing. (c) 2006 Elsevier Inc. All rights reserved.
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