Linked Life Data

9589428

Source:http://linkedlifedata.com/resource/pubmed/id/9589428

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1998-7-10
pubmed:abstractText
An earlier study indicated that increased levels of corn oil in the diet resulted in decreased tumor yield after promotion by the phorbol ester 12-O-tetradecanoylphorbol-13-acetate in Sencar mouse epidermis (J Leyton, ML Lee, M Locniskar, MA Belury, TJ Slaga, et al. Cancer Res 51, 907-915, 1991). In the present study we investigated whether corn oil diets could alter the subcellular distribution and activity of protein kinase C (PKC), which is part of an important signaling pathway in carcinogenesis. We used three 15% (wt/wt) fat semipurified diets containing three ratios of corn oil to coconut oil: 1.0%:14.0% (Diet L), 7.9%:7.1% (Diet M), and 15.0%:0.0% (Diet H). The translocation to the membrane fraction of epidermal PKC by 12-O-tetradecanoylphorbol-13-acetate was decreased as the corn oil content of the diet was increased, and this correlates with the decrease in tumor yield. The translocation to the membrane fraction of specific isoforms of PKC was affected by increased dietary corn oil: the largest decreases were in cytosolic PKC-alpha and -beta, and the smallest change was in PKC-epsilon. The other isoforms, PKC-delta and -zeta, were unaffected. The major constituent of corn oil is linoleic acid, which did not affect the binding of phorbol ester to PKC, which suggests that inhibition of such binding was not responsible for the effects of increased dietary corn oil. Products of linoleic acid metabolism, i.e., arachidonic acid and 13-hydroxyoctadecadienoic acid, also did not affect the binding of phorbol ester to PKC. Thus the results of these studies suggest that the subcellular distributions of PKC and its isoforms can be modulated by dietary lipids.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0163-5581
pubmed:author
pubmed:issnType
Print
pubmed:volume
30
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
108-17
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Dietary lipid varying in corn and coconut oil influences protein kinase C in phorbol ester-treated mouse skin.
pubmed:affiliation
Department of Foods and Nutrition, University of Georgia, Athens 30602, USA. mmouat@hestia.fcs.uga.edu
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't