Linked Life Data

2200530

Source:http://linkedlifedata.com/resource/pubmed/id/2200530

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1990-9-18
pubmed:abstractText
In BC3H-1 myocytes, insulin has been reported to (a) increase diacyglycerol (DAG) production and provoke increases in protein kinase C enzyme activity of crude or DEAE-Sephacel-purified cytosol and membrane fractions in BC3H-1 myocytes (Cooper et al. (1987) J. Biol. Chem. 262, 3633-3739), but (b) decrease cytosolic, and transiently increase membrane, immunoreactive protein kinase C (Acevedo-Duncan et al. (1989) FEBS Lett. 244, 174-176). Presently, we used a Mono-Q column to purify protein kinase C and found that, similar to immunoblot findings, enzyme activity decreased in the cytosol, and increased in the membrane during insulin treatment. Similar differences in protein kinase C activation patterns were observed in rat adipose tissue: insulin stimulated cytosolic protein kinase C enzyme activity as measured after DEAE-Sephacel chromatography, but decreased cytosolic enzyme activity when measured after Mono-Q chromatography or by immunoblotting. We presently evaluated the possibility that insulin-induced increases in endogenous DAG may influence protein kinase C during assay in vitro. Crude cytosol from BC3H-1 myocytes contained 25-35% of total and [3H]glycerol-labelled DAG and insulin increased this DAG. Considerable amounts of [3H]glycerol-labelled DAG were present in insulin-stimulated protein kinase C-containing column fractions following DEAE-Sephacel chromatography of cytosol fractions, whereas lesser amounts were recovered after Mono-Q column chromatography. This difference in recovery of DAG and activation of the enzyme by this endogenous DAG may explain why we were able to discern insulin-induced (presumably translocation 'provoked') decreases in cytosolic protein kinase C in the present Mono-Q column preparations of both BC3H-1 myocytes and rat adipose tissue.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
13
pubmed:volume
1054
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
95-102
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Protein kinase C activation patterns are determined by methodological variations. Studies of insulin action in BC3H-1 myocytes and rat adipose tissue.
pubmed:affiliation
James A. Haley Veterans Administration Hospital, Tampa, FL 33612.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.