Linked Life Data

17507508

Source:http://linkedlifedata.com/resource/pubmed/id/17507508

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2007-7-11
pubmed:abstractText
We have combined electrophysiology and chemical separation and measurement techniques with capillary electrophoresis (CE) to evaluate the role of endogenous d-serine as an NMDA receptor (NMDAR) coagonist in the salamander retina. Electrophysiological experiments were carried out using whole cell recordings from retinal ganglion cells and extracellular recordings of the proximal negative response (PNR), while bath applying two D-serine degrading enzymes, including d-amino acid oxidase (DAAO) and D-serine deaminase (DsdA). The addition of either enzyme resulted in a significant and rapid decline in the light-evoked responses observed in ganglion cell and PNR recordings. The addition of exogenous D-serine in the presence of the enzymes restored the light-evoked responses to the control or supracontrol amplitudes. Heat-inactivated enzymes had no effect on the light responses and blocking NMDARs with AP7 eliminated the suppressive influence of the enzymes as well as the response enhancement normally associated with exogenous d-serine application. CE was used to separate amino acid racemates and to study the selectivity of DAAO and DsdA against D-serine and glycine. Both enzymes showed high selectivity for D-serine without significant effects on glycine. Our results strongly support the concept that endogenous D-serine plays an essential role as a coagonist for NMDARs, allowing them to contribute to the light-evoked responses of retinal ganglion cells. Furthermore under our experimental conditions, these coagonist sites are not saturated so that modulation of NMDAR sensitivity can be achieved with further modulaton of d-serine.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0022-3077
pubmed:author
pubmed:issnType
Print
pubmed:volume
98
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
122-30
pubmed:dateRevised
2007-12-3
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Endogenous D-serine contributes to NMDA-receptor-mediated light-evoked responses in the vertebrate retina.
pubmed:affiliation
Department of Neuroscience, 6-145 Jackson Hall, University of Minnesota, Minneapolis, MN 55455, USA. gusta080@umn.edu
pubmed:publicationType
Journal Article, In Vitro, Research Support, N.I.H., Extramural