Linked Life Data

14612920

Source:http://linkedlifedata.com/resource/pubmed/id/14612920

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2003-11-12
pubmed:abstractText
Multidrug-resistance (MDR) is largely caused by the efflux of therapeutics from the tumor cell by means of P-glycoprotein (P-gp), resulting in reduced efficacy of the chemotherapy. In order to overcome MDR, substances, such as verapamil and cyclosporin A (CsA), were employed. As these P-gp modulating agents did not seem promising in clinical practice, new compounds with a low degree of undesirable side effects, were introduced. In this study, bisindolic alkaloid voacamine was examined for its possible capability of enhancing the cytotoxic effect of doxorubicin (DOX) on drug resistant cells. Two different pairs of tumor cell lines were analyzed: the parental lymphoblastoid cell line CEM-WT and its MDR derivative CEM-R, the parental osteosarcoma cell line U-2 OS-WT and its resistant counterpart U-2 OS-R. These cell lines were characterized for their morphological features by scanning electron microscopy (SEM) and for the expression of the main drug transporters by flow cytometric analysis. The effects of voacamine on the cell survival and on both accumulation and efflux of DOX were then investigated. The intracellular distribution of DOX, given alone or in association with CsA or voacamine, was observed by laser scanning confocal microscopy. A differential effect of voacamine between sensitive and resistant cells on the intracellular DOX concentration and distribution was shown. In particular, voacamine induced a significant increase of drug retention and intranuclear location in resistant cells. The results of cell survival experiments revealed an enhancement of the cytotoxic effect of DOX induced by voacamine, confirmed by evident morphological changes observed by SEM. These findings suggest promising applications of this natural substance against MDR tumors.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
1019-6439
pubmed:author
pubmed:issnType
Print
pubmed:volume
23
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1505-13
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:14612920-Alkaloids, pubmed-meshheading:14612920-Antibodies, Monoclonal, pubmed-meshheading:14612920-Antineoplastic Agents, pubmed-meshheading:14612920-Antineoplastic Combined Chemotherapy Protocols, pubmed-meshheading:14612920-Cell Line, Tumor, pubmed-meshheading:14612920-Cell Survival, pubmed-meshheading:14612920-Cyclosporine, pubmed-meshheading:14612920-Dose-Response Relationship, Drug, pubmed-meshheading:14612920-Doxorubicin, pubmed-meshheading:14612920-Drug Resistance, Neoplasm, pubmed-meshheading:14612920-Flow Cytometry, pubmed-meshheading:14612920-Gentiana, pubmed-meshheading:14612920-Humans, pubmed-meshheading:14612920-Ibogaine, pubmed-meshheading:14612920-Microscopy, Confocal, pubmed-meshheading:14612920-Microscopy, Electron, Scanning, pubmed-meshheading:14612920-Plant Extracts
pubmed:year
2003
pubmed:articleTitle
Voacamine, a bisindolic alkaloid from Peschiera fuchsiaefolia, enhances the cytotoxic effect of doxorubicin on multidrug-resistant tumor cells.
pubmed:affiliation
Laboratory of Ultrastructures, National Institute of Health, Rome, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't