Linked Life Data

1934352

Source:http://linkedlifedata.com/resource/pubmed/id/1934352

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1991-11-27
pubmed:abstractText
We have investigated in bovine left ventricular coronary arteries the relation between the biochemical regulatory event of myosin light chain phosphorylation and the mechanical events of isometric stress and isotonic shortening, under conditions of stimulation by depolarization (65 mM KCl) or receptor occupancy (2 microM 5-hydroxytryptamine [5-HT]). At rest, levels of light chain phosphorylation were 0.07 +/- 0.01 mol phosphate/mol light chain. Maximal values were significantly different for KCl (0.42 +/- 0.02 mol phosphate/mol light chain at 1 minute) and 5-HT stimulation (0.58 +/- 0.01 mol phosphate/mol light chain at 30 seconds). Increases in light chain phosphorylation preceded isometric stress development, and values remained elevated at approximately 0.35 mol phosphate/mol light chain for up to 2 hours with both KCl and 5-HT. The sites of phosphorylation were identical for KCl and 5-HT at 2 hours. Maximal stresses for each stimulus were also maintained for 2 hours. Values of maximum velocity of shortening (Vo in muscle lengths [ML]/sec), obtained from the force-velocity relation, did not change significantly between 1 minute and 2 hours with KCl (0.070 +/- 0.008 ML/sec at 1 minute and 0.056 +/- 0.007 ML/sec at 2 hours, p greater than 0.2). However, during 5-HT stimulation, Vo declined significantly (0.053 +/- 0.006 ML/sec at 1 minute and 0.032 +/- 0.003 ML/sec at 2 hours, p less than 0.025). The relation between Vo and light chain phosphorylation was different for KCl and 5-HT, indicating that factors in addition to myosin light chain phosphorylation may modulate smooth muscle shortening velocity.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0009-7330
pubmed:author
pubmed:issnType
Print
pubmed:volume
69
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1207-14
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
Force-velocity relation and myosin light chain phosphorylation in bovine coronary arterial smooth muscle.
pubmed:affiliation
Department of Physiology, University of Texas Southwestern Medical Center, Dallas 75235-9040.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.