Linked Life Data

19800018

Source:http://linkedlifedata.com/resource/pubmed/id/19800018

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3-4
pubmed:dateCreated
2009-11-16
pubmed:abstractText
The mechanism(s) regulating nitric oxide synthase-1 (NOS1) localization within the cardiac myocyte in health and disease remains unknown. Here we tested the hypothesis that the PDZ-binding domain interaction between CAPON (carboxy-terminal PDZ ligand of NOS1), a NOS1 adaptor protein and NOS1, contribute to NOS1 localization in specific organelles within cardiomyocytes. Ventricular cardiomyocytes and whole heart homogenates were isolated from sham and post-myocardial infarction (MI) wild-type (C57BL/6) and NOS1(-/-) female mice for quantification of CAPON protein expression levels. NOS1, CAPON, xanthine oxidoreductase and Dexras1, a CAPON binding partner, were all present and enriched in isolated cardiac sarcoplasmic reticulum (SR) fractions. CAPON co-immunoprecipitated with the mu and alpha isoforms of NOS1 in whole heart lysates, and co-localization of CAPON and NOS1 was demonstrated in the SR and mitochondria with dual immuno-gold electron microscopy. Following MI, CAPON and NOS1 both redistributed to caveolae and colocalized with caveolin-3. In addition, following MI, expression level of CAPON remained unchanged and Dexras1 was reduced, CAPON binding to xanthine oxidoreductase was augmented and the plasma membrane calcium ATPase (PMCA) increased. In NOS1 deficient myocytes, CAPON abundance in the SR was reduced, and redistribution to caveolae and PMCA binding after MI was absent. Together these findings support the hypothesis that NOS1 redistribution in injured myocardium requires the formation of a complex with the PDZ adaptor protein CAPON.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1089-8611
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
21
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
226-33
pubmed:dateRevised
2011-4-21
pubmed:meshHeading
pubmed:articleTitle
Cardiac nitric oxide synthase-1 localization within the cardiomyocyte is accompanied by the adaptor protein, CAPON.
pubmed:affiliation
Division of Cardiology and Interdisciplinary Stem Cell Institute, Miller School of Medicine, University of Miami, Miami, FL, USA.
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural