Linked Life Data

16741052

Source:http://linkedlifedata.com/resource/pubmed/id/16741052

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2006-6-2
pubmed:abstractText
Endothelin-1 (ET-1) acts at selected brain loci to elicit a pressor response and secretion of vasopressin (AVP). Glutamatergic receptors of the N-methyl-D-aspartate (NMDA) subtype mediate ET-1-induced AVP secretion in vitro, but the role of glutamatergic receptors in the pressor response and the secretion of AVP in vivo has not been studied. We hypothesized that both the pressor response and AVP secretion in response to ET-1 microinjection into subfornical organ (SFO) would be suppressed by ionotropic glutamatergic receptor antagonists in the paraventricular nucleus (PVN). Sinoaortic denervated male Long Evans rats were equipped with intracerebral cannulae directed into the SFO and the magnocellular region of the PVN bilaterally. Experiments were performed 5 days later in conscious rats. Direct injection of 5 pmol ET-1 into the SFO resulted in a 20 +/- 3 mm Hg increase in mean arterial pressure (MAP) (+/- SE) and a 14.1 +/- 0.3 pg/ml increase in the mean plasma AVP level (+/- SE) (P < 0.001 vs. artificial CSF) that was blocked by selective ET(A) inhibition. Neither the pressor response nor the increase in plasma AVP in response to ET-1 was altered despite prior injection of the NMDA blocker diclozipine (5 microg, MK801) into PVN bilaterally. In contrast, bilateral PVN injection with 6-cyano-7-nitroquinoxaline-2,3-dione (40 nmol, CNQX) prevented the pressor response (MAP +/- SE, - 4 +/- 4 mm Hg) and also inhibited AVP secretion (mean AVP level +/- SE, 0.16 +/- 0.50 pg/ml) (P < 0.001 vs. vehicle in PVN after injection of ET-1 into SFO). These findings support the conclusion that both the pressor response and AVP secretion in response to ET-1 acting at the SFO are mediated by a non-NMDA, most likely an aminopropionic acid glutamatergic receptor within the PVN.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1535-3702
pubmed:author
pubmed:issnType
Print
pubmed:volume
231
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1075-80
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Aminopropionic acid receptors in paraventricular nucleus mediate pressor and vasopressin responses to endothelin-1 in subfornical organ.
pubmed:affiliation
Departments of Medicine and Physiology, Wayne State University School of Medicine and John D. Dingell VA Medical Center, 4160 John R Street, #908, Detroit, Michigan 48201, USA. nrossi@med.wayne.edu
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.