Linked Life Data

18499757

Source:http://linkedlifedata.com/resource/pubmed/id/18499757

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
2008-8-25
pubmed:abstractText
Estrogen exerts neuroprotective effects and reduces beta-amyloid accumulation in models of Alzheimer's disease (AD). A few years ago, a new neuroprotective gene, i.e. seladin-1 (for selective AD indicator-1), was identified and found to be down-regulated in AD vulnerable brain regions. Seladin-1 inhibits the activation of caspase-3, a key modulator of apoptosis. In addition, it has been demonstrated that the seladin-1 gene encodes 3beta-hydroxysterol Delta24-reductase, which catalyzes the synthesis of cholesterol from desmosterol. We have demonstrated previously that in fetal neuroepithelial cells, 17beta-estradiol (17betaE2), raloxifene, and tamoxifen exert neuroprotective effects and increase the expression of seladin-1. The aim of the present study was to elucidate whether seladin-1 is directly involved in estrogen-mediated neuroprotection. Using the small interfering RNA methodology, significantly reduced levels of seladin-1 mRNA and protein were obtained in fetal neuroepithelial cells. Seladin-1 silencing determined the loss of the protective effect of 17betaE2 against beta-amyloid and oxidative stress toxicity and caspase-3 activation. A computer-assisted analysis revealed the presence of half-palindromic estrogen responsive elements upstream from the coding region of the seladin-1 gene. A 1490-bp region was cloned in a luciferase reporter vector, which was transiently cotransfected with the estrogen receptor alpha in Chinese hamster ovarian cells. The exposure to 17betaE2, raloxifene, tamoxifen, and the soy isoflavones genistein and zearalenone increased luciferase activity, thus suggesting a functional role for the half-estrogen responsive elements of the seladin-1 gene. Our data provide for the first time a direct demonstration that seladin-1 may be considered a fundamental mediator of the neuroprotective effects of estrogen.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0013-7227
pubmed:author
pubmed:issnType
Print
pubmed:volume
149
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4256-66
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed-meshheading:18499757-Amyloid beta-Peptides, pubmed-meshheading:18499757-Animals, pubmed-meshheading:18499757-Base Sequence, pubmed-meshheading:18499757-CHO Cells, pubmed-meshheading:18499757-Cell Survival, pubmed-meshheading:18499757-Cells, Cultured, pubmed-meshheading:18499757-Cricetinae, pubmed-meshheading:18499757-Cricetulus, pubmed-meshheading:18499757-Cytoprotection, pubmed-meshheading:18499757-Estradiol, pubmed-meshheading:18499757-Gene Silencing, pubmed-meshheading:18499757-Humans, pubmed-meshheading:18499757-Molecular Sequence Data, pubmed-meshheading:18499757-Nerve Tissue Proteins, pubmed-meshheading:18499757-Neurons, pubmed-meshheading:18499757-Neuroprotective Agents, pubmed-meshheading:18499757-Oxidoreductases Acting on CH-CH Group Donors, pubmed-meshheading:18499757-RNA, Small Interfering, pubmed-meshheading:18499757-Time Factors
pubmed:year
2008
pubmed:articleTitle
Seladin-1 is a fundamental mediator of the neuroprotective effects of estrogen in human neuroblast long-term cell cultures.
pubmed:affiliation
Endocrine Unit, Department of Clinical Physiopathology, Center for Research, Transfer and High Education on Chronic Inflammatory, Degenerative and Neoplastic Disorders for the Development of Novel Therapies, University of Florence, Florence, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't