Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6 Pt 1
pubmed:dateCreated
1991-1-31
pubmed:abstractText
Upon transferring confluent monolayers of Madin-Darby canine kidney (MDCK) cells from a low-Ca2+ medium (1-5 microM) to one with 1.8 mM Ca2+ (Ca switch), tight junctions (TJs) assemble and seal, and transepithelial electrical resistance (TER) develops in 4-5 h, presumably through exocytotic fusion that incorporates junctional components to the surface membrane. In the present work we test this possibility and observe 1) that the Ca switch raises the cytosolic concentration of this ion; 2) that it also increases the membrane area by 22%; 3) that chloroquine, a drug which prevents exocytosis, blocks both the increase of surface membrane and the sealing of TJs; and 4) that if monolayers are not permanently switched to 1.8 mM Ca2+, but are subject to a 15-min pulse, cytosolic free Ca2+ concentration [( Ca2+]c) transiently increases but returns to low values (14 +/- 11 nM) and TER does not develop. Comparisons of the time course of TJ sealing with levels of [Ca2+]c, as well as the relationship between these parameters and extracellular Ca2+ levels, suggest that this ion may act from the extracellular side or in a narrow intracellular domain in the close vicinity of the plasma membrane.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/1,2-bis(2-aminophenoxy)ethane-N,N,N'..., http://linkedlifedata.com/resource/pubmed/chemical/8-(N,N-diethylamino)octyl-3,4,5-trim..., http://linkedlifedata.com/resource/pubmed/chemical/Affinity Labels, http://linkedlifedata.com/resource/pubmed/chemical/Calcium, http://linkedlifedata.com/resource/pubmed/chemical/Calcium Channel Blockers, http://linkedlifedata.com/resource/pubmed/chemical/Chloroquine, http://linkedlifedata.com/resource/pubmed/chemical/Egtazic Acid, http://linkedlifedata.com/resource/pubmed/chemical/Gallic Acid, http://linkedlifedata.com/resource/pubmed/chemical/Indo-1 pentaacetoxymethyl ester, http://linkedlifedata.com/resource/pubmed/chemical/Indoles, http://linkedlifedata.com/resource/pubmed/chemical/Mannitol, http://linkedlifedata.com/resource/pubmed/chemical/Verapamil
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0002-9513
pubmed:author
pubmed:issnType
Print
pubmed:volume
259
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
C978-86
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Role of calcium in tight junction formation between epithelial cells.
pubmed:affiliation
Center of Research and Advanced Studies, Mexico City DF, Mexico.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't