Linked Life Data

9180631

Source:http://linkedlifedata.com/resource/pubmed/id/9180631

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1997-7-3
pubmed:abstractText
We recorded changes in arterial blood pressure, heart rate, and renal sympathetic nerve activity in response to intracerebroventricular injection of bovine hypothalamic/hypophysary inhibitory factor and ouabain in conscious Wistar rats. Ouabain at 0.3 to 0.6 microgram caused dose-related increases in blood pressure, heart rate, and nerve activity (peak increases: 19 +/- 2 mm Hg, 42 +/- 4 beats per minute, and 48 +/- 4%, respectively; P < .05 versus basal). These responses were all blocked by central antibody Fab fragments, which bind ouabain and related steroids with high affinity. The inhibitory factor significantly increased blood pressure but decreased heart rate and nerve activity. Dose-dependent increases in blood pressure as well as heart rate and nerve activity were observed when the inhibitory factor was injected after intravenous injection of the vasopressin antagonist D-(CH2)5Tyr-(Me)AVP. Central Fab fragments, however, did not affect these responses. Both ouabain and the inhibitory factor inhibited Na+,K+-ATPase activity in vitro. Fab fragments blocked this inhibition by ouabain but not by the inhibitory factor. These data indicate that the ouabainlike sympathoexcitatory effect of this factor is masked probably by a potent central effect on vasopressin release. In contrast to rat brain "ouabain," this factor does not exhibit a high affinity for the Fab fragments, supporting the previous finding that this compound is structurally a nonouabain Na+,K+-ATPase inhibitor.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0194-911X
pubmed:author
pubmed:issnType
Print
pubmed:volume
29
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1291-5
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Sympathoexcitatory effect of hypothalamic/hypophysary inhibitory factor in rats.
pubmed:affiliation
University of Ottawa, Heart Institute, Ontario, Canada.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't