Linked Life Data

12206998

Source:http://linkedlifedata.com/resource/pubmed/id/12206998

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
12
pubmed:dateCreated
2002-10-10
pubmed:abstractText
Amyloid beta-peptide (Abeta), Abeta precursor protein (APP), apolipoprotein E (apoE), and elevated cholesterol levels have been linked to Alzheimer's disease (AD) pathology. High cholesterol levels increase APP and apoE expression in human NT2 neuron progenitor cells. A cholesterol-rich environment also induces processing of APP, leading to the formation of Abeta and Abeta peptide fragments. Using a novel method, we determined that 1) cholesterol binds to Abeta at alpha-secretase cleavage site; 2) Abeta17-40 rather than Abeta1-40 prevents cholesterol from binding to apoE; 3) Abeta1-40 inhibits cholesterol from binding to low-density lipoprotein (LDL), leading to decrease cholesterol influx and intracellular cholesterol levels; 4) the binding of cholesterol to apoE or LDL was abolished completely in presence of Abeta1-42. Increased extracellular free cholesterol levels are toxic to neurons; this toxicity is prevented by specific lipoproteins, such as high-density lipoproteins, which maintain their ability to bind cholesterol in the presence of Abeta. We propose that one of the physiological functions of Abeta and APP is to control cholesterol transport. AD is associated with increased Abeta production. High cholesterol levels also lead to overproduction of Abeta. Abeta blocks cholesterol trafficking and changes cholesterol homeostasis leading to neurodegeneration and the onset and/or progression of AD pathology.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
1530-6860
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
16
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1677-9
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
Function of beta-amyloid in cholesterol transport: a lead to neurotoxicity.
pubmed:affiliation
Division of Hormone Research, Department of Cell Biology, Georgetown University School of Medicine, Washington, DC 20057, USA.
pubmed:publicationType
Journal Article