Linked Life Data

3999147

Source:http://linkedlifedata.com/resource/pubmed/id/3999147

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1985-7-11
pubmed:abstractText
Cardiocytes of unloaded myocardium rapidly lose structural and functional integrity through a combined loss of myofibrils and contractile activity; both changes are reversible with load restoration. The present study correlates the biochemical composition of unloaded and reloaded myocardium with these alterations in structure and function. Cardiac muscle was unloaded by transecting the chordae tendineae of a cat right ventricular papillary muscle and was reloaded by suturing these same chordae tendineae to the ventricular wall at the base of the valve; an adjacent intact muscle served as the control. Muscles unloaded for 1 to 14 days were assayed for DNA, protein, total creatine and hydroxyproline content. The ratios of wet weight/DNA and creatine/DNA decreased by 30 and 22% respectively, in parallel with a 38% reduction in cardiocyte cross-sectional area. Protein/unit wet weight was decreased by 50% after 14 days of unloading, so that both protein/DNA and protein/creatine were markedly reduced. Reloading of the muscle restored cardiocyte size, protein per unit wet weight and protein/DNA to normal. Parallel reductions in both contractile filaments and contractile proteins after unloading and parallel increases in each following load restoration were demonstrated by morphometric analysis of electron micrographs and analysis of actin and myosin by gel electrophoresis. In summary, the myocardium undergoes marked, parallel changes in structure, function and biochemical composition in response to the removal and restoration of load.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0022-2828
pubmed:author
pubmed:issnType
Print
pubmed:volume
17
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
153-65
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
1985
pubmed:articleTitle
Biochemical and structural correlates in unloaded and reloaded cat myocardium.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't