Linked Life Data

12742070

Source:http://linkedlifedata.com/resource/pubmed/id/12742070

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4-5
pubmed:dateCreated
2003-5-13
pubmed:abstractText
Glutamine has multiple physiological and pathophysiological roles in the brain. Because of their position at the interface between blood and brain, the cerebral capillaries and the choroid plexuses that form the blood-brain barriers (BBB) and blood-cerebrospinal fluid (CSF) barriers, have the potential to influence brain glutamine concentrations. Despite this, there has been a paucity of data on the mechanisms and polarity of glutamine transport at these barrier tissues. In situ brain perfusion in the rat, indicates that blood to brain L-[14C]glutamine transport at the blood-brain barrier is primarily mediated by a pH-dependent, Na(+)-dependent, System N transporter, but that blood to choroid plexus transport is primarily via a pH-independent System N transporter and a Na(+)-independent carrier that is not System L. Transport studies in isolated rat choroid plexuses and primary cultures of choroid plexus epithelial cells indicate that epithelial L-[14C]glutamine transport is polarized (apical uptake>basolateral) and that uptake at the apical membrane is mediated by pH dependent System N transporters (identified as SN1 and SN2 by polymerase chain reaction) and the Na(+)-independent System L. Blood-brain barrier System N transport is markedly effected by cerebral ischemia and may be a good marker of endothelial cell dysfunction. The multiple glutamine transporters at the blood-brain and blood-CSF barriers may have role in meeting the metabolic needs of the brain and the barrier tissues themselves. However, it is likely that the main role of these transporters is removing glutamine, and thus nitrogen, from the brain.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0197-0186
pubmed:author
pubmed:issnType
Print
pubmed:volume
43
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
279-88
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:articleTitle
Glutamine transport at the blood-brain and blood-cerebrospinal fluid barriers.
pubmed:affiliation
Department of Neurosurgery, University of Michigan, R5550 Kresge I, Ann Arbor, MI 48109-0532, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.