Linked Life Data

2702487

Source:http://linkedlifedata.com/resource/pubmed/id/2702487

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
1989-5-19
pubmed:abstractText
Intracellular recordings were made from glomus cells in the excised, intact or sliced (150-200 microns) carotid body. Carotid nerve discharge was also recorded from intact preparations. Slices were prepared for visual (Nomarski) control of microelectrode impalement. Resting potential (Em), input resistance (Ro) and voltage noise (Erms) were measured in control conditions and in response to several stimulants (interruption of flow, hypoxic and histotoxic [NaCN]anoxia, hypercapnia, asphyxia and acidity) and depressants (alkalinity, cooling) of the carotid nerve sensory discharge. Different glomus cells responded differently to the same stimulus but significant trends were found. The more common responses to zero flow and anoxia (hypoxic and histotoxic) were depolarization (64%) and decreases in Erms (63%) and Ro (71%). When extracellular pH was varied from 8.5 to 5.0, the preponderant responses were cell depolarization, and increases in noise and input resistance as pH decreased. Consequently, cell depolarization induced by zero flow and anoxia tended to be accompanied by reduced Ro, whereas that induced by acidity generally showed increased Ro. Changes in voltage noise usually followed variations in Ro. When nerve discharge frequency was plotted against delta Em or delta Erms there were positive correlations during acid stimulation. However, these correlations were complex (parabolic) during flow interruption and anoxia: an increase in discharge occurred in response to cell depolarization and to hyperpolarization. These results suggest that hypoxia and hypercapnic or acidic stimuli act on glomus cells by different mechanisms. This finding is consistent with evidence obtained by recording carotid nerve discharges in intact animals.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0006-8993
pubmed:author
pubmed:issnType
Print
pubmed:day
16
pubmed:volume
477
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
265-79
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Changes in glomus cell membrane properties in response to stimulants and depressants of carotid nerve discharge.
pubmed:affiliation
Department of Physiology, University of Utah School of Medicine, Salt Lake City 84108.
pubmed:publicationType
Journal Article, In Vitro, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't