Linked Life Data

10402226

Source:http://linkedlifedata.com/resource/pubmed/id/10402226

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1999-8-31
pubmed:abstractText
Glutathione (GSH) transport was studied in synaptosomal membrane vesicles (SMV) of rat cerebral cortex. The present study shows that GSH uptake into SMV occurs very quickly in a time-dependent manner into an osmotically active intravesicular space. The initial rate of transport followed Michealis-Menten saturation kinetics with a Km 4.5+/-0.8 microM that shows a high affinity of the transporter for GSH. Therefore GSH uptake in SMV occurs by a mediated transport system which can be activated by either an inward gradient of cations, like Na+ or K+, or membrane depolarization. These results, together with those obtained by valinomycin-induced K+ diffusion potential, indicate that GSH synaptosomal transport is electrogenic by a negative charge transfer. The increase of GSH uptake measured by trans-stimulation experiments confirms a GSH bidirectional mediated transport which seems susceptible of modulation by changes in ionic fluxes and in the membrane potential. These results may indicate a possible involvement of this transporter in the role suggested for GSH in synaptic neurotransmission; also considering that GSH precursor of neuroactive aminoacids (glycine, glutamate), may contribute to regulate their level in synapses. Finally, a GSH transporter in synaptosomes may contribute to maintaining the GSH homeostasis in cerebral cortex, where decreases of GSH levels have been related to susceptibility to neuropathologies.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0197-0186
pubmed:author
pubmed:issnType
Print
pubmed:volume
34
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
509-16
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1999
pubmed:articleTitle
Evidence of glutathione transporter in rat brain synaptosomal membrane vesicles.
pubmed:affiliation
Department of Biochemical Sciences, University of Firenze, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't