Linked Life Data

11595216

Source:http://linkedlifedata.com/resource/pubmed/id/11595216

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2001-10-11
pubmed:abstractText
Neurons within sensory ganglia have been proposed to communicate via non-synaptic release of a diffusible chemical messenger, but the identity of the chemical mediator(s) remains unknown [J. Neurosci. 16 (1996) 4733-4741]. The present study addressed the possibility of co-released ATP and substance P (SP) within sensory ganglia to further advance the hypothesis of non-synaptic communication between sensory neurons. Microdialysis probes inserted into trigeminal ganglia (TRGs) of anesthetized guinea pigs were perfused with artificial cerebrospinal fluid and the collected perfusate analyzed for ATP and SP content using the firefly luciferin-luciferase (L/L) assay and radioimmunoassay, respectively. Significant reversible increases in ATP and SP levels were observed after infusion of 100 mM KCl or 1 mM capsaicin. Ca(2+)-free ACSF produced an eightfold increase in ATP levels, interpreted as a decrease in activity of Ca(2+)-dependent ecto-nucleotidases that degrade ATP. In contrast, KCl-induced release of ATP in the presence of normal Ca(2+) was blocked by Cd(2+), a voltage-gated Ca(2+) channel blocker, illustrating Ca(2+)-dependence of evoked ATP release. Since ganglionic release of ATP could arise from several neuronal and non-neuronal sources we directly tested acutely dissociated TRG neuron somata for ATP release. Neuron-enriched dissociated TRG cells were plated onto glass tubes and tested for ATP release using the L/L assay. Robust ATP release was evoked with 5 microM capsaicin. These data suggest that ATP is released concurrently with SP from the somata of neurons within sensory ganglia.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0006-8993
pubmed:author
pubmed:issnType
Print
pubmed:day
12
pubmed:volume
915
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
248-55
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Concurrent release of ATP and substance P within guinea pig trigeminal ganglia in vivo.
pubmed:affiliation
Division of Oral Biology & Medicine, UCLA School of Dentistry, Los Angeles, CA 90095-1668, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't