Linked Life Data

8394721

Source:http://linkedlifedata.com/resource/pubmed/id/8394721

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1993-9-21
pubmed:abstractText
Transcripts for the class A Ca2+ channel alpha 1 subunit (also known as BI) are present at high levels in many parts of the mammalian CNS and are widely assumed to encode the P-type Ca2+ channel. To characterize the biophysical and pharmacological properties of alpha 1A channels, macroscopic and single-channel recordings were made in Xenopus oocytes injected with alpha 1A cRNA. alpha 1-specific properties were identified by making systematic comparisons with the more familiar class C alpha 1 subunit under the condition of a standard ancillary subunit (alpha 2/delta + beta) makeup. alpha 1A currents activate and inactivate more rapidly and display steeper voltage dependence of gating than alpha 1C currents. Unlike alpha 1C, alpha 1A channels are largely insensitive to dihydropyridines and FPL 64176, but respond to the cone snail peptide omega-CTx-MVIIC(SNX-230), a potent and fairly selective inhibitor. In comparison with P-type Ca2+ channels in rat cerebellar Purkinje cells, alpha 1A channels in oocytes are approximately 10(2)-fold less sensitive to omega-Aga-IVA and approximately 10-fold more sensitive to omega-CTx-MVIIC. alpha 1A channels are not inhibited by Bay K 8644 and inactivate much more rapidly than P-type Ca2+ channels. Thus, alpha 1A is capable of generating a Ca2+ channel phenotype quite different from P-type current.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0896-6273
pubmed:author
pubmed:issnType
Print
pubmed:volume
11
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
291-303
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Distinctive biophysical and pharmacological properties of class A (BI) calcium channel alpha 1 subunits.
pubmed:affiliation
Department of Molecular and Cellular Physiology, Stanford University, California 94305-5426.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't