Linked Life Data

10784361

Source:http://linkedlifedata.com/resource/pubmed/id/10784361

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2000-6-21
pubmed:abstractText
In this study we examined the effects of 3-24 h of incubation of chemically skinned rat fast-twitch muscle with the glycolytic metabolite glucose 6-phosphate (G6-P) on the contractile properties and myosin ATPase activity in single muscle fibres, and on the carbohydrate content of myosin heavy chains (MHCs). Exposure of the permeabilised muscle to 10 mM G6-P for 24 h at 22+/-1 degrees C in a rigor solution containing protease inhibitors and a reducing agent (dithiothreitol, DTT) significantly decreased maximum Ca(2+)-activated force output by 31%, lowered the Ca2+ threshold for contraction by 0.1 pCa units and produced shallower force-pCa curves compared with controls. Furthermore, under these conditions, G6-P-treated muscle displayed lower myofibrillar MgATPase activity and a markedly higher carbohydrate content of MHCs, as identified with an immunoblot protocol for glycoprotein detection. Shorter incubations under the same conditions or 24-h incubations with 5 mM G6-P generally resulted in smaller changes in the contractile activation parameters. These findings suggest that reducing sugars acting as metabolic intermediates in the glycolytic pathway can have important non-energy-related effects on the contractile activation characteristics of mammalian skeletal muscle. These effects are consistent with the glycation of muscle proteins, in particular that of the MHC.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0031-6768
pubmed:author
pubmed:issnType
Print
pubmed:volume
439
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
845-52
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Ca2+-activation characteristics of single fibres from chemically skinned rat muscle incubated with glucose-6-phosphate.
pubmed:affiliation
School of Zoology, Faculty of Science and Technology, La Trobe University, Bundoora, Victoria, Australia. M.Patterson@zoo.latrobe.edu.au
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't