Linked Life Data

2468291

Source:http://linkedlifedata.com/resource/pubmed/id/2468291

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4 Pt 1
pubmed:dateCreated
1989-5-18
pubmed:abstractText
The influence of doxyl stearic acids (DSAs) on gap junctional conductance (gj) between pairs of neonatal rat heart cells was studied. DSAs are spin probes that perturb the membrane at different depths depending on position of the doxyl group on the fatty acyl chain. 16-DSA and 12-DSA rapidly and reversibly reduced gj to unmeasureable levels in a dose- and time-dependent manner. Single channel events observed when gj was low were of the same unitary size as those observed under control conditions. The methyl esters of 16- and 12-DSA, stearic acid itself, and TEMPO, an analogue of the doxyl group that has no fatty acyl chain, had no effect on gj. Protonation of the carboxyl head group (by acidifying the solution) reduced the potency of 16- or 12-DSA. Spontaneous beating activity and action potentials were observed at concentrations of the DSAs 15-20 times that necessary for uncoupling. These results indicate that uncoupling by the DSAs requires the presence of the charged carboxyl group and localized perturbation of the channel at the lipid-channel interface by the doxyl group. Furthermore, they predict that unsaturated free fatty acids, which accumulate during ischemia, may exert their arrhythmogenic effect by reducing gj, and thereby slowing conduction.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0002-9513
pubmed:author
pubmed:issnType
Print
pubmed:volume
256
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
C913-24
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Uncoupling of cardiac cells by doxyl stearic acids specificity and mechanism of action.
pubmed:affiliation
Department of Physiology, College of Medicine, University of Arizona, Tucson 85724.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't