Linked Life Data

10486307

Source:http://linkedlifedata.com/resource/pubmed/id/10486307

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1999-10-18
pubmed:abstractText
We studied the effects of prelytic copper concentrations on cell volume, intracellular pH, and ion transport in lamprey erythrocytes. Ion fluxes and pH were measured by radioactive tracer technique, patch clamp, and flame photometry. Prelytic CuSO(4) concentration of 100 microM caused anion-dependent intracellular acidification and increase in Cl(-) influx after 2 min lag-phase. In the presence of ascorbate copper effect was amplified and lag-phase was skipped. Pretreatment of the cells with N-phenyl maleimide abolished copper-induced changes completely. Copper treatment caused an increase in Na(+) fluxes in both directions and a net Na(+) uptake. Copper-induced Na(+) transport was partially amiloride(MIA)-sensitive representing Na(+)/H(+) exchange. The nature of the amiloride-insensitive fraction of copper-activated Na(+) influx remains unknown. Cell swelling after 15 min of copper exposure induced regulatory volume decrease response involving KCl extrusion via K(+) and Cl(-) volume-sensitive channels. We suggest that the effects of copper on ion transport fit the following sequence of events: (i) cupric ions are reduced to cuprous state on the membrane surface, (ii) electroneutral pairs CuCl and CuOH mediate chloride/hydroxyl exchange, as shown before for trialkyltin, dissipating transmembrane pH gradient, and (iii) changes in intracellular pH result in the activation of the Na(+)/H(+) exchange and consecutive volume changes cause the RVD response.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0041-008X
pubmed:author
pubmed:copyrightInfo
Copyright 1999 Academic Press.
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
159
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
204-13
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1999
pubmed:articleTitle
Copper effects on ion transport across lamprey erythrocyte membrane: Cl(-)/OH(-) exchange induced by cuprous ions.
pubmed:affiliation
Department of Biology, University of Turku, Turku, FIN-20014, Finland.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't