Linked Life Data

8747198

Source:http://linkedlifedata.com/resource/pubmed/id/8747198

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1996-10-9
pubmed:abstractText
1. Intracellular recordings were made from intramural neurons in the urinary bladder of guinea pigs. 2. The neurons were located in two types of ganglia: those where the cells were densely packed and those where the neurons were loosely packed. Staining of the cells by intracellular injections of markers showed that the cells had between one to three long processes and several short dendrites. 3. The resting potential measured in 230 neurons was -55.20 +/- 0.67 (SE) mV, and the input resistance was 58.37 +/- 1.78 M omega. 4. Injection of depolarizing currents from the recording electrode evoked two types of firing patterns. In 86.2% of the neurons, depolarizing currents evoked a prolonged firing of action potentials (tonic cells). In the rest of the neurons, a depolarization elicited one to three action potentials only (phasic cells). In all the cells tested, the action potentials were reversibly blocked by tetrodotoxin (TTX; 1 microM). In the presence of TTX. Ca2+ spikes were observed in 50% of the cases. 5. Single action potentials were followed by fast hyperpolarizations having mean duration of 92.7 +/- 6.0 ms and amplitude of 13.3 +/- 1.0 mV. In 62.5% of the cells repetitive firing of action potentials was followed by delayed, slow hyperpolarizations (duration 3.8 +/- 0.5 s), which were diminished by the K+ channel blocker 4-aminopyridine and in Ca+2-free high-Mg2+ medium. These results indicate that the prolonged after-spike hyperpolarizations were due to opening of Ca(2+)-induced K+ channels. 6. Electrical stimulation of nerve fiber tracts evoked fast excitatory synaptic potentials that were blocked by the nicotinic receptor antagonist hexamethonium (0.2 mM). Exogenous acetylcholine elicited depolarizations that were also blocked by hexamethonium. Nerve stimulation at frequencies of 0.1 Hz or higher caused strong facilitation of the synaptic potentials. Stimulation at 10-20 Hz did not evoke slow synaptic potentials.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0022-3077
pubmed:author
pubmed:issnType
Print
pubmed:volume
74
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2358-65
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Intracellular recordings from intramural neurons in the guinea pig urinary bladder.
pubmed:affiliation
Hadassah University Hospital, Hadassah Medical School, Laboratory of Experimental Surgery, Mount Scopus, Jerusalem, Israel.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't