Linked Life Data

16464956

Source:http://linkedlifedata.com/resource/pubmed/id/16464956

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2006-4-3
pubmed:abstractText
Neurofibrillary tangles (NFTs) are a characteristic neuropathological feature of Alzheimer's disease (AD), and molecular chaperones appear to be involved in the removal of disease-associated hyperphosphorylated tau, a primary component of NFTs. Here, novel HSP90 inhibitors were used to examine the impact of chaperone elevation on clearance of different tau species in transfected cells using a unique quantitative assay. The HSP90 inhibitors reduced levels of tau phosphorylated at proline-directed Ser/Thr sites (pS202/T205, pS396/S404) and conformationally altered (MC-1) tau species, an epitope that is immeasurable by standard Western blot techniques. The selective clearance of these phospho-tau species and MC-1 tau was mediated via the proteasome, while lysosomal-mediated tau degradation seems to lack specificity for certain tau species, suggesting a more general role in total tau removal. Interestingly, tau phosphorylated at S262/S356 within the tau microtubule binding domain was minimally affected by chaperone induction. Overall, our data show that chaperone induction results in the selective clearance of specific phospho-tau and conformationally altered tau species mediated by the proteasome; however, the apparent stability of pS262/S356 tau may also explain why MARK is able to regulate normal tau function yet still be linked to the initiation of pathogenic tau hyperphosphorylation in AD.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1530-6860
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
20
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
753-5
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
HSP induction mediates selective clearance of tau phosphorylated at proline-directed Ser/Thr sites but not KXGS (MARK) sites.
pubmed:affiliation
Mayo Clinic Jacksonville, College of Medicine, Jacksonville, Florida, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural