Linked Life Data

12098617

Source:http://linkedlifedata.com/resource/pubmed/id/12098617

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
2002-7-5
pubmed:abstractText
Microelectrode recordings of impulse activity in nociceptive C fibres were performed in cutaneous fascicles of the peroneal nerve at the knee level in healthy human subjects. Mechano-heat responsive C units (CMH), mechano-insensitive but heat-responsive (CH) as well as mechano-insensitive and heat-insensitive C units (CM(i)H(i)) were identified. A subgroup of the mechano-insensitive units was readily activated by histamine. We studied the responsiveness of these nociceptor classes to injection of 20 microl 5 mM adenosintriphosphate (ATP) using saline injections as control. Because of mechanical distension during injection, which typically activates mechano-responsive C fibres, interest was focused on responsiveness to ATP after withdrawal of the injection needle. Post-injection responses were observed in 17/27 (63%) mechano-responsive units and in 14/22 (64%) mechano-insensitive units. Excitation by ATP occurred in 9/11 CH units and in 5/11 CM(i)H(i) units. ATP responsive units were found both within the histamine-responsive and the histamine-insensitive group of mechano-insensitive fibres. ATP responses appeared with a delay of 0-180 s after completion of injection; responses were most pronounced during the first 1-3 min of activation, and irregular ongoing activity was observed for up to 10 or even 20 min. ATP responses were dose-dependent, concentrations lower than 5 mM gave weaker responses. No heat or mechanical sensitisation was observed in any of the major fibre classes. In conclusion, we have shown that ATP injections at high concentrations activate C-nociceptors in healthy human skin, without preference for mechano-responsive or mechano-insensitive units. ATP did not sensitise human C fibres for mechanical or heat stimuli. We discuss how various mechanisms might contribute to the observed responses to ATP.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0304-3959
pubmed:author
pubmed:issnType
Print
pubmed:volume
98
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
59-68
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
ATP responses in human C nociceptors.
pubmed:affiliation
Department of Clinical Neurophysiology, University of Uppsala, S-75185 Uppsala, Sweden. marita.hilliges@ofa.ki.se
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't