Linked Life Data

20633543

Source:http://linkedlifedata.com/resource/pubmed/id/20633543

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
2010-8-23
pubmed:abstractText
Overproduction of neuronal nitric oxide synthase (nNOS)-derived NO is detrimental during cerebral ischemia. Normobaric hyperoxia (NBO) has been shown to be neuroprotective, extending the therapeutic time window for ischemic stroke, but the mechanism is not fully understood. In the present study, using a rat model of ischemic stroke, we investigated the effect of early NBO treatment on neuronal NO production. Male Sprague-Dawley rats were given normoxia (30% O(2)) or NBO (95% O(2)) during 10, 30, 60 or 90min filament occlusion of the middle cerebral artery. NO(x)(-) (nitrite plus nitrate) and 3-nitrotyrosine were measured in the ischemic cortex. Ischemia caused a rapid increase in the production of NO(x)(-), with a peak at 10min after ischemia onset, then gradually declining to the baseline level at 60min. NBO treatment delayed the NO(x)(-) production peak to 30min and attenuated the total amount of NO(x)(-). Ischemia also increased 3-nitrotyrosine formation, which was significantly reduced by NBO treatment. Inhibition of nNOS by pre-treatment with 7-nitroindazole had similar effect as NBO treatment on NO(x)(-) and 3-nitrotyrosine production, and when combined with NBO, no further reduction in NO production was observed. Furthermore, NBO treatment significantly decreased brain infarct volume. Taken together, our findings demonstrate that delaying and attenuating the early NO release from nNOS may be an important mechanism accounting for NBO's neuroprotection.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
1872-6240
pubmed:author
pubmed:issnType
Electronic
pubmed:day
17
pubmed:volume
1352
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
248-54
pubmed:dateRevised
2011-9-26
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Normobaric hyperoxia delays and attenuates early nitric oxide production in focal cerebral ischemic rats.
pubmed:affiliation
College of Pharmacy and Center of Biomedical Research Excellence, University of New Mexico Health Sciences Center, Albuquerque, NM 87131-0001, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural