Linked Life Data

10559194

Source:http://linkedlifedata.com/resource/pubmed/id/10559194

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
47
pubmed:dateCreated
1999-12-14
pubmed:abstractText
The mechanism by which the intra-erythrocytic form of the human malaria parasite, Plasmodium falciparum, extrudes H(+) ions and thereby regulates its cytosolic pH (pH(i)), was investigated using saponin-permeabilized parasitized erythrocytes. The parasite was able both to maintain its resting pH(i) and to recover from an imposed intracellular acidification in the absence of extracellular Na(+), thus ruling out the involvement of a Na(+)/H(+) exchanger in both processes. Both phenomena were ATP-dependent. Amiloride and the related compound ethylisopropylamiloride caused a substantial reduction in the resting pH(i) of the parasite, whereas EMD 96785, a potent and allegedly selective inhibitor of Na(+)/H(+) exchange, had relatively little effect. The resting pH(i) of the parasite was also reduced by the sulfhydryl reagent N-ethylmaleimide, by the carboxyl group blocker N,N'-dicyclohexylcarbodiimide, and by bafilomycin A(1), a potent inhibitor of V-type H(+)-ATPases. Bafilomycin A(1) blocked pH(i) recovery in parasites subjected to an intracellular acidification and reduced the rate of acidification of a weakly buffered solution by parasites under resting conditions. The data are consistent with the hypothesis that the malaria parasite, like other parasitic protozoa, has in its plasma membrane a V-type H(+)-ATPase, which serves as the major route for the efflux of H(+) ions.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
19
pubmed:volume
274
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
33213-9
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1999
pubmed:articleTitle
pH regulation in the intracellular malaria parasite, Plasmodium falciparum. H(+) extrusion via a v-type h(+)-atpase.
pubmed:affiliation
Division of Biochemistry, Faculty of Science, Australian National University, Canberra, Australian Capital Territory 0200, Australia.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't