Linked Life Data

7828005

Source:http://linkedlifedata.com/resource/pubmed/id/7828005

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1995-2-21
pubmed:abstractText
The effects of dibutyryl cyclic AMP (dbcAMP) treatment on Ca2+ channel activities, Ca2+ accumulation by intracellular Ca2+ pools, and sizes of IP3- and GTP-releasable pools in neuroblastoma x glioma hybrid NG108-15 cells were studied. High extracellular K+ induced a greater rise in intracellular calcium concentration ([Ca2+]i) in dbcAMP-treated cells than in control cells. In dbcAMP-treated cells, the initial phase of the high K(+)-induced [Ca2+]i rise displayed a much higher sensitivity to omega-conotoxin than it did in control cells, whereas the plateau phase of the [Ca2+]i rise was sensitive only to nifedipine. These results indicate that predominantly L-type Ca2+ channels exist in control cells, and that N-type channels develop only after dbcAMP treatment. In dbcAMP-treated cells, mitochondria showed an increased Ca2+ uptake capacity (5.3 nmol Ca2+/mg protein) compared with that in control cells (4.2 nmol Ca2+/mg protein). However, dbcAMP treatment did not cause significant change in the affinity for Ca2+. Dibutyryl cAMP treatment enhanced the Ca2+ accumulation activity by nonmitochondrial pools (from 0.84 to 0.97 nmol Ca2+/mg protein) and increased the affinity for Ca2+ (EC50 for Ca2+ decreased from 0.146 microM to 0.063 microM). Our data also indicate that the pool that is sensitive to both IP3 and GTP was enlarged. The affinities for IP3 and GTP in causing Ca2+ release remained the same before or after dbcAMP treatment.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0006-8993
pubmed:author
pubmed:issnType
Print
pubmed:day
10
pubmed:volume
660
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
81-7
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Enhanced calcium signalling events in neuroblastoma x glioma hybrid NG108-15 cells after treatment with dibutyryl cyclic AMP.
pubmed:affiliation
Department of Biochemistry, National Defense Medical Center, Taipei, Taiwan, ROC.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't