Linked Life Data

2846199

Source:http://linkedlifedata.com/resource/pubmed/id/2846199

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1988-12-9
pubmed:abstractText
The effects of lidocaine on sodium current in cardiac myocytes isolated from cat and guinea pig were investigated using the whole-cell variation of the patch-clamp technique. Lidocaine (43-200 microM) reduced sodium current during repetitive depolarizing pulses in a use-dependent manner. To clarify the nature of the use-dependent block, we characterized the time course of block development using a two-pulse protocol. Two distinct phases of block development were found: a rapid phase (tau = 1-6 msec) having a time course concurrent with the time course of channel activation, and a slower phase (tau = 100-900 msec), which developed after channels inactivated. The amplitude of the block during the rapid phase of development was a steep function of transmembrane voltage over the range of -70 to +20 mV. The voltage-dependence was similar to that for sodium channel activation (sodium conductance) but was too steep to be attributed solely to the passive movement of a singly charged molecule under the influence of the transmembrane voltage gradient. These results suggest that use-dependent block of sodium channels in cardiac tissue may result from an interaction of lidocaine with sodium channels in the activated as well as the inactivated channel states. Possible mechanisms underlying the fast component of block are discussed.
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
63
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
869-78
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
Evidence for two components of sodium channel block by lidocaine in isolated cardiac myocytes.
pubmed:affiliation
Department of Pharmacology, Northwestern University, Chicago, IL 60611.
pubmed:publicationType
Journal Article, In Vitro, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't