Linked Life Data

9151292

Source:http://linkedlifedata.com/resource/pubmed/id/9151292

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1997-8-8
pubmed:abstractText
We investigated the action of histamine on C6-astroglioma cells using patch clamp recording and intracellular calcium measurement. Application of 100 microM histamine hyperpolarized the resting membrane potential and increased free intracellular calcium. Membrane hyperpolarization was accompanied by a decrease in input resistance. The effect of histamine was reversible and responses persisted following repeated applications. In voltage clamp experiments histamine elicited an outward current associated with a conductance increase and a reversal potential near the Nernst potential for potassium. The action of histamine was blocked by mepyramine but not by cimetidine or thioperamide suggesting that a H1 receptor mediated the response. Quinidine and charybdotoxin, but not apamin, blocked the hyperpolarization. Buffering internal calcium with BAPTA diminished the activation of the potassium channel, suggesting a calcium-dependent K(+)-channel, which was also found to be regulated by protein kinase C and phosphatases. The increase in intracellular calcium was not dependent on external calcium or sensitive to pertussis toxin, cholera toxin, forskolin or 8-bromo-cAMP. Both the hyperpolarization and the increase in intracellular calcium were blocked by thapsigargin or the phospholipase C inhibitor U73122. These results indicate that histamine liberates calcium from internal stores by activation of phospholipase C which in turn leads to an increase of intracellular Ca2+ and thereby to the activation of a calcium-dependent potassium channel in C6 glial cells.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0028-1298
pubmed:author
pubmed:issnType
Print
pubmed:volume
355
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
559-65
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Histamine H1 receptors in C6 glial cells are coupled to calcium-dependent potassium channels via release of calcium from internal stores.
pubmed:affiliation
Heinrich-Heine-Universität Düsseldorf, Institute of Physiology II, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't