Linked Life Data

12012026

Source:http://linkedlifedata.com/resource/pubmed/id/12012026

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2002-5-15
pubmed:abstractText
The compound 2-aminoethoxydiphenyl borate (2-APB) has been used as either a specific membrane-permeable inhibitor for InsP(3) receptors or a store-operated Ca(2+) channel blocker in some cells. In this study, we have investigated actions of 2-APB on Ca(2+) signalling in mouse pancreatic acinar cells by measuring Ca(2+) concentration in the cytosol ([Ca(2+)]c) and in the endoplasmic reticulum (ER). Although 2-APB (50 microM) inhibited or modulated [Ca(2+)]c oscillations generated by a low dose of ACh, it did not block InsP(3)-mediated Ca(2+) release from the ER elicited by high doses of acetylcholine (ACh). 2-APB alone more than 70 microM tended to increase [Ca(2+)]c. When we directly measured Ca(2+) concentration in the lumen of the ER with a low affinity Ca(2+) dye, Mag-fluo-4, 2-APB itself slowly lowered ER Ca(2+) concentration and ACh could further release Ca(2+) from the ER in the presence of 2-APB, suggesting its lack of potency to block InsP(3) receptors. When store-operated Ca(2+) entry was evoked by addition of external Ca(2+) (5 mM) after depletion of Ca(2+) stores, 2-APB (50 microM) substantially blocked the Ca(2+) influx in a reversible manner. We conclude that (a) 2-APB is a good blocker for store-operated Ca(2+) channels, (b) 2-APB could not effectively block InsP(3) receptors, and (c) low doses of 2-APB lower Ca(2+) concentration in the lumen of the ER without a significant elevation of [Ca(2+)]c.
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
365
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
399-405
pubmed:dateRevised
2007-7-18
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
Slow depletion of endoplasmic reticulum Ca(2+) stores and block of store-operated Ca(2+) channels by 2-aminoethoxydiphenyl borate in mouse pancreatic acinar cells.
pubmed:affiliation
Department of Physiology, Sungkyunkwan University School of Medicine, 300 Chunchundong, Changanku, Suwon 440-746, Korea. mkpark@med.skku.ac.kr
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't