Linked Life Data

19413888

Source:http://linkedlifedata.com/resource/pubmed/id/19413888

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
11-12
pubmed:dateCreated
2010-4-16
pubmed:abstractText
T-type Ca(2+) currents have been detected in cells from the external muscular layers of gastrointestinal smooth muscles and appear to contribute to the generation of pacemaker potentials in interstitial cells of Cajal from those tissues. However, the Ca(2+) channel alpha subunit responsible for these currents has not been determined. We established that the alpha subunit of the alpha(1H) Ca(2+) channel is expressed in single myocytes and interstitial cells of Cajal using reverse transcription and polymerase chain reaction from whole tissue, laser capture microdissected tissue and single cells isolated from the mouse jejunum. Whole-cell voltage clamp recordings demonstrated that a nifedipine and Cd(2+) resistant, mibefradil-sensitive current is present in myocytes dissociated from the jejunum. Electrical recordings from the circular muscle layer demonstrated that mibefradil reduced the frequency and initial rate of rise of the electrical slow wave. Gene targeted knockout of both alleles of the cacna1h gene, which encodes the alpha(1H) Ca(2+) channel subunit, resulted in embryonic lethality because of death of the homozygous knockouts prior to E13.5 days in utero. We conclude that a channel with the pharmacological and molecular characteristics of the alpha(1H) Ca(2+) channel subunit is expressed in interstitial cells of Cajal and myocytes from the mouse jejunum, and that ionic conductances through the alpha(1H) Ca(2+) channel contribute to the upstroke of the pacemaker potential. Furthermore, the survival of mice that do not express the alpha(1H) Ca(2+) channel protein is dependent on the genetic background and targeting approach used to generate the knockout mice.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1582-4934
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
13
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4422-31
pubmed:dateRevised
2011-4-12
pubmed:meshHeading
pubmed:articleTitle
The alpha1H Ca2+ channel subunit is expressed in mouse jejunal interstitial cells of Cajal and myocytes.
pubmed:affiliation
Enteric Neuroscience Program, Mayo Clinic College of Medicine, Rochester, MN, USA. gibbons.simon@mayo.edu
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural