Linked Life Data

18948673

Source:http://linkedlifedata.com/resource/pubmed/id/18948673

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2008-11-21
pubmed:abstractText
We herein examine the effect of cardiac troponin T (CTnT) suppression in cultured chicken cardiomyocytes derived from embryonic cardiac ventricular muscle. TnT is an important protein participating in regulation of striated muscle contraction, but it is not clear whether TnT contributes to the formation of sarcomere structure in myofibrils. Double-stranded RNA homologous to the nucleotide sequence of CTnT (CTnT-siRNA) was introduced into cultured muscle cells two days after plating. Transfection efficiency was above 80%. Immunoblot analyses suggested that the expression of CTnT progressively falls for the three consecutive days after transfection, but partly reappears on the fourth day. Maximum suppression occurs three days after transfection, with almost invisible CTnT protein on immunoblots in all the examined conditions: 0.5-2 nmol CTnT-siRNA towards 1-3 x 10(6) cells. The suppression was specific to CTnT, and the other myofibrillar proteins such as myosin, connectin/titin, tropomyosin, alpha-actinin, and troponin I were all present in transfected cells. The following functional and morphological changes were detected in CTnT-suppressed cells. The population of beating cells decreased significantly after transfection, when compared to control cells. A part of CTnT-suppressed cells showed two non-overlapping types of morphological changes: 1) myofibrils presenting unusually long Z-Z intervals; 2) myofibrils with irregular small striations in cells not connected at their adhesion interfaces of a jagged-appearance. Thus, our results reveal that CTnT is important for stable beating in cultured ventricular muscle cells, and also to some extent, for maintaining myofibrillar structure and cell-to-cell adhesion.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1347-3700
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
33
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
193-201
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Suppression of cardiac troponin T induces reduction of contractility and structural disorganization in chicken cardiomyocytes.
pubmed:affiliation
Department of Environmental Biology, Kumamoto Gakuen University, Oe, Kumamoto, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't