Linked Life Data

1980720

Source:http://linkedlifedata.com/resource/pubmed/id/1980720

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1991-3-14
pubmed:abstractText
Previous electrophysiological studies in aged rats have revealed a number of deficits in noradrenergic neurotransmission in the central nervous system. Such deficits include subsensitivity to the depressant effects of norepinephrine on cerebellar Purkinje neurons, which has been attributed specifically to altered beta adrenergic receptor-mediated processes. The objective of this study was to determine which beta adrenergic receptor subtype, beta 1 or beta 2, is responsible for this age-related subsensitivity. The effects of beta 1 and beta 2 agonists on spontaneous activity of Purkinje neurons was first examined in young rats and the selectivity of these agents was validated using selective beta 1 and beta 2 antagonists. The effects of the selective beta 1 and beta 2 agonists were then compared in young (3-month-old) and aged (18- and 26-month-old) Fischer 344 rats. These agents were applied to Purkinje neurons by pressure microejection from multibarreled micropipettes and the change in neuronal action potential discharge rate was recorded. Both dobutamine, a beta 1-selective agonist, and zinterol, a beta 2-selective agonist, induced dose-dependent inhibitions of Purkinje cell firing rate. Dobutamine-induced inhibitions were blocked by the selective beta 1 antagonist, ICI 89406 and not by the beta 2-selective antagonist, ICI 118551; conversely, zinterol-induced inhibitions were not blocked by ICI 89406 but were blocked by the presence of ICI 118551. Purkinje neurons of both groups of aged rats were significantly less sensitive to locally applied dobutamine than Purkinje cells of young rats.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0197-4580
pubmed:author
pubmed:issnType
Print
pubmed:volume
11
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
591-6
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:articleTitle
Age-related subsensitivity of cerebellar Purkinje neurons to locally applied beta 1-selective adrenergic agonist.
pubmed:affiliation
Department of Pharmacology, University of Colorado Health Sciences Center, Denver 80262.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.