Linked Life Data

2613761

Source:http://linkedlifedata.com/resource/pubmed/id/2613761

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pubmed-article:2613761pubmed:abstractTextCultured adult rat ventricular cardiac muscle cells were treated with either 12-O-tetradecanoyl-phorbol-13-acetate (TPA) or diacylglycerol (DAG) and observed by in situ transmission electron microscopy. Membrane specializations present in untreated cells (intercalated discs, transverse tubules, plasmalemmal couplings) were also present after TPA and DAG treatment. In the case of the transverse tubular system, there was morphological evidence for active growth. Our studies showed that myofilaments began to become disorganized after 12-24 h of TPA treatment and that after 2 days of exposure to TPA the breakdown of sarcomeres was essentially complete. Myocytes that were treated with TPA for 2 days and then allowed to recover in control medium for 5 days contained sarcomeres in various stages of reassembly. These data indicate that TPA-treated cardiac myocytes retain several membrane specializations, suggesting that there are separate controls for myofilament organization and the maintenance of these differentiated plasmalemmal regions. Furthermore, the ability of the myocytes to recover from TPA treatment may provide investigators with a useful model with which to study myofibrillogenesis.lld:pubmed
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pubmed-article:2613761pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:2613761pubmed:articleTitleDifferentiated membrane specializations and myofibrillar breakdown and recovery in cultured adult cardiac myocytes treated with TPA and diacylglycerol.lld:pubmed
pubmed-article:2613761pubmed:affiliationDepartment of Anatomy, Louisiana State University Medical Center, New Orleans 70119.lld:pubmed
pubmed-article:2613761pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2613761pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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