Linked Life Data

3266531

Source:http://linkedlifedata.com/resource/pubmed/id/3266531

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
11
pubmed:dateCreated
1989-5-15
pubmed:abstractText
Dissociated primary cultures of glial cells released a remarkable amount of purines, at rest and during field electrical stimulation. The HPLC identification of labelled compounds derived from 3H-Adenosine (3H-Ado) (employed to preload the cultures) indicated that nucleotides and nucleosides were represented in the superfusate in equivalent proportions (43.86% and 56.14% respectively). Very much higher amounts of unlabelled purines prevalently constituted by nucleotides compounds (91.10%) were also released and detectable in the superfusate. In all the experimental conditions their evoked release did not result frequency-dependent. Since: a linear increase related to the stimulation frequencies was found for the released labelled compounds; no labelled purines were assayed in 5 x 10-5M Dipyridamole-treated cultures; any significant presence of labelled nucleotides, inosine and hypoxantine was not found in cultures simultaneously treated with 1 x 10-5M 2'-deoxycoformycin and 1 x 10-4M 1-(-5-isoquinolinsulfonyl)-2-methylpiperizine (H7) (3H-Ado amounts resulted more than doubled in these experimental conditions); labelled compounds have been assumed as tracers of a glial purine rate whose release can be connected to electrically-evoked action potentials. Purine outflow from glial cells is not sodium dependent, in fact TTX (5 x 10-7M) did not affect their basal or electrically-evoked release. A remarkable calcium-dependence was also evidentiated by the 1 x 10-4M Verapamil-induced inhibition of basal and evoked release. TEA (1 x 10-2M), a specific inhibitor of potassium efflux throughout calcium-mediated specific channels, strongly reduced the evoked purine outflow and any additive effect of its was not detectable when administered simultaneously to the calcium antagonist. These findings indicate that the frequency-dependent purine release from cultured glial cells is linked to ionic mechanisms, which calcium and potassium are mainly involved in.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0031-6989
pubmed:author
pubmed:issnType
Print
pubmed:volume
20
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
935-47
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
Cultures of glial cells release purines under field electrical stimulation: the possible ionic mechanisms.
pubmed:affiliation
Institute of Neuroscience, University of Chieti, Medical School, Italy.
pubmed:publicationType
Journal Article