Linked Life Data

1691678

Source:http://linkedlifedata.com/resource/pubmed/id/1691678

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1990-5-29
pubmed:abstractText
The effects of the peripheral-type benzodiapine receptor (PBR) ligands Ro 5-4864 and PK 11195 were studied in the spontaneously beating guinea pig atrium and in a model for myocardial ischemia in the rat. In the former, Bay K 8644 produced positive chronotropic and inotropic responses; intracarotid administration of this agonist (5 or 10 micrograms kg-1) to anesthetized rats elicited a transient increase in mean arterial blood pressure accompanied by alterations in the ECG pattern. Ro 5-4864 and PK 11195 (10 microM) completely blocked the positive chronotropic effect of Bay K 8644 in the atrium, PK 11209, a structural analog of PK 11195 with a low affinity for PBR, was inactive, and the central benzodiazepine receptor ligand clonazepam had a marginal effect. Ro 5-4864 potentiated whereas PK 11195 inhibited the myocardial ischemia produced by Bay K 8644 in the rat. Furthermore, PK 11195 blocked the combined response to Bay K 8644 and Ro 5-4864. Addition of Ro 5-4864 (10 microM) to the organ bath potentiated the inotropic effect of Bay K 8644 in the atria; PK 11195 at the same concentration inhibited this effect. Clonazepam and PK 11209 were both inactive in this regard. Nifedipine, a potent calcium channel antagonist, completely blocked the inotropic and chronotropic responses to Bay K 8644. PK 11195 and Ro 5-4864 did not affect this action. These findings strongly suggest that there is a functional association between PBR and voltage-operated calcium channels in the guinea pig atrium and rat cardiovascular system.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0008-4212
pubmed:author
pubmed:issnType
Print
pubmed:volume
68
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
40-5
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Interactions between peripheral-type benzodiazepine receptor ligands and an activator of voltage-operated calcium channels.
pubmed:affiliation
Division of Basic Medical Sciences, Memorial University of Newfoundland, St. John's, Canada.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't