Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1994-9-15
pubmed:abstractText
1. We have studied the effects of hypoxia on membrane potential and [Ca2+]i in enzymically isolated type I cells of the neonatal rat carotid body (the principal respiratory O2 chemosensor). Isolated cells were maintained in short term culture (3-36 h) before use. [Ca2+]i was measured using the Ca(2+)-sensitive fluoroprobe indo-1. Indo-1 was loaded into cells using the esterified form indo-1 AM. Membrane potential was measured (and clamped) in single isolated type I cells using the perforated-patch (amphotericin B) whole-cell recording technique. 2. Graded reductions in PO2 from 160 Torr to 38, 19, 8, 5 and 0 Torr induced a graded rise of [Ca2+]i in both single and clumps of type I cells. 3. The rise of [Ca2+]i in response to anoxia was 98% inhibited by removal of external Ca2+ (+1 mM EGTA), indicating the probable involvement of Ca2+ influx from the external medium in mediating the anoxic [Ca2+]i response. 4. The L-type Ca2+ channel antagonist nicardipine (10 microM) inhibited the anoxic [Ca2+]i response by 67%, and the non-selective Ca2+ channel antagonist Ni2+ (2 mM) inhibited the response by 77%. 5. Under voltage recording conditions, anoxia induced a reversible membrane depolarization (or receptor potential) accompanied, in many cases, by trains of action potentials. These electrical events were coincident with a rapid rise of [Ca2+]i. When cells were voltage clamped close to their resting potential (-40 to -60 mV), the [Ca2+]i response to anoxia was greatly reduced and its onset was much slower.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:grant
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-1331289, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-1374973, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-1432712, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-1629763, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-1704113, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-1721902, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-1913162, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-1928325, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-2041730, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-2072734, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-2231419, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-2737279, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-2738574, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-5499750, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-7506754, http://linkedlifedata.com/resource/pubmed/commentcorrection/8057251-8272380
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0022-3751
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
476
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
423-8
pubmed:dateRevised
2010-8-25
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Effects of hypoxia on membrane potential and intracellular calcium in rat neonatal carotid body type I cells.
pubmed:affiliation
University Laboratory of Physiology, Oxford.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't