Linked Life Data

11918346

Source:http://linkedlifedata.com/resource/pubmed/id/11918346

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2002-3-28
pubmed:abstractText
Capacitative calcium entry (CCE), the mechanism that replenishes intracellular calcium stores after depletion, is essential to intracellular calcium signaling. CCE is mediated by the channels in the plasma membrane generally referred to as "store operated channels (SOCs)". However, the molecular identity of the SOCs has never been determined, and the mechanism of the activation of SOCs remains to be elucidated. Recent studies have demonstrated that 2-aminoethoxydiphenyl borate (2-APB), which has been found to be an antagonist of inositol 1,4,5-trisphosphate receptors (IP3Rs), inhibits CCE, suggesting that IP3Rs channel activity is essential to the generation of CCE. However, CCE has also been reported to occur normally in IP3R-deficient cells. In order to resolve this discrepancy, we investigated the effect of 2-APB on CCE in IP3Rs-deficient cells. In response to store depletion with thapsigargin or N,N,N',N'-tetrakis (2-pyridylmethyl) ethylene diamine (TPEN), CCE was generated in IP3Rs-deficient cells the same as in wild-type cells, however, 2-APB abolished CCE in IP3Rs-deficient cells, despite the fact that this cell line does not possess functional IP3Rs. We also examined the effect of 2-APB on several types of TRP Ca2+ channels, which exhibit properties similar to those of SOCs. 2-APB had a different inhibitory effect on spontaneous and thapsigargin-induced Ba2+ influx in cells that transiently expressed individual TRP subtypes. These results suggest that the channel activity of IP3Rs is not essential to the generation of CCE in this cell line and that 2-APB inhibits CCE independently of the function of IP3Rs.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/2-aminoethoxydiphenyl borate, http://linkedlifedata.com/resource/pubmed/chemical/Boron Compounds, http://linkedlifedata.com/resource/pubmed/chemical/Calcium, http://linkedlifedata.com/resource/pubmed/chemical/Calcium Channel Blockers, http://linkedlifedata.com/resource/pubmed/chemical/Calcium Channels, http://linkedlifedata.com/resource/pubmed/chemical/Chelating Agents, http://linkedlifedata.com/resource/pubmed/chemical/Ethylenediamines, http://linkedlifedata.com/resource/pubmed/chemical/ITPR1 protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Inositol 1,4,5-Trisphosphate, http://linkedlifedata.com/resource/pubmed/chemical/Inositol 1,4,5-Trisphosphate..., http://linkedlifedata.com/resource/pubmed/chemical/N,N,N',N'-tetrakis(2-pyridylmethyl)e..., http://linkedlifedata.com/resource/pubmed/chemical/Receptors, Cytoplasmic and Nuclear
pubmed:status
MEDLINE
pubmed:issn
1060-6823
pubmed:author
pubmed:issnType
Print
pubmed:volume
7
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
429-39
pubmed:dateRevised
2007-7-18
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
2-Aminoethoxydiphenyl borate (2-APB) inhibits capacitative calcium entry independently of the function of inositol 1,4,5-trisphosphate receptors.
pubmed:affiliation
Department of Basic Medical Sciences, Institute of Medical Science, University of Tokyo, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't