Linked Life Data

14972018

Source:http://linkedlifedata.com/resource/pubmed/id/14972018

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2004-2-19
pubmed:abstractText
Tocopheryl succinate (TS), a succinyl ester of alpha-tocopherol (alpha-T), has been reported to have various biological activities. In this communication, we review the current findings about TS including our recent studies of its effects on nitric oxide (NO) and superoxide (O2-) generations implicated in cancer and atherosclerosis. First, we investigated the effect of TS on NO production in vascular smooth muscle cells (VSMC) under atherosclerosis-like conditions using lipopolysaccharide (LPS) and interferon-gamma (IFN). TS enhanced LPS/IFN-dependent NO production, but alpha-T itself did not. The enhancement by TS of NO production was inhibited by alpha-T but not by antioxidants such as ascorbic acid and 2[3]-t-butyl-4-hydroxyanisole (BHA). TS enhanced the amount of protein kinase Calpha (PKCalpha) in VSMC, and PKC inhibitors inhibited TS-enhanced NO production, suggesting that the enhancing effect of TS on NO production is caused by up-regulation of PKC. Second, we found that TS induced apoptosis in VSMC associated with increase in O2- generation via NADPH-dependent oxidase. We further observed that a mouse breast cancer cell line C127I was more susceptible for TS-induced apoptosis than a mouse breast normal cell line NmuMG, and that superoxide dismutase, alpha-T, and BHA inhibited TS-caused morphological cell damage in C127I. From these results, O2- itself and/or other reactive oxygen species are assumed to associate with TS-induced cell toxicity, and antioxidative defense systems are supposed to be lowered in cancer cells. Finally, we found that intravenous injection of TS vesicles completely inhibited the growth of melanoma cells B16-F1 inoculated on the back of hairless mice and enhanced their survival time.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0006-2979
pubmed:author
pubmed:issnType
Print
pubmed:volume
69
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
50-7
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Enhancement of nitric oxide and superoxide generations by alpha-tocopheryl succinate and its apoptotic and anticancer effects.
pubmed:affiliation
Faculty of Pharmaceutical Sciences, Tokushima University, Tokushima, 770-8505, Japan. fukuzawa@ph.tokushima-u.ac.jp
pubmed:publicationType
Journal Article, Review