Linked Life Data

16534739

Source:http://linkedlifedata.com/resource/pubmed/id/16534739

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2006-3-14
pubmed:abstractText
Gambogic acid, usually isolated as an inseparable stereomeric mixture of C-2 epimers, was newly separated into two epimers (1 and 2) from the gamboges of Garcinia hanburyi. The stereochemistry at C-2 was clearly defined by extensive spectroscopic analysis and direct comparison of NMR and HPLC data with those of the known R-epimer. Both epimers were examined for their cytotoxicities against human leukemia K562 (K562/S) and doxorubicin-resistant K562 (K562/R) cell lines. Different from doxorubicin (IC (50) = 10.78 microM for K562/R and 0.66 microM for K562/S), epimers 1 and 2 exhibited similar activities against both cell lines (IC(50) = 1.32 and 0.89 microM for 1, IC(50) = 1.11 and 0.86 microM for 2). These results suggested that both epimers were not multidrug resistance (MDR) substrates. Furthermore, epimers 1 and 2 were tested for their inhibitory effects against six human cytochrome P-450 enzymes. Epimers 1 and 2 showed little inhibitory effects toward five of the enzymes except CYP2C9. Interestingly, when tested against CYP2C9, S-epimer 2 had an inhibitory effect 20-fold stronger than that of R-epimer 1.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0032-0943
pubmed:author
pubmed:issnType
Print
pubmed:volume
72
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
281-4
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Gambogic acid and epigambogic acid, C-2 epimers with novel anticancer effects from Garcinia hanburyi.
pubmed:affiliation
Chinese Medicine Laboratory, Hong Kong Jockey Club Institute of Chinese Medicine, Shatin, NT, PR China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't