Publication :
Role of caveolin-1 in etoposide resistance development in A549 lung cancer cells

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Date
2004-07-23
Direction de publication
Direction de recherche
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ISSN de la revue
Titre du volume
Éditeur
Taylor & Francis
Projets de recherche
Structures organisationnelles
Numéro de revue
Résumé
Caveolin 1 expression is downregulated in various cancer cell lines. Interestingly, in several drug-resistant cancer cells, a strong induction of caveolin 1 expression has been reported suggesting a role for caveolin 1 in the acquisition and/or the maintenance of multidrug resistance phenotype. In addition, it was reported that p-glycoprotein localized to caveolin-rich membrane domains in these cells. In this study, we progressively exposed A549 lung adenocarcinoma cells to increasing doses of etoposide. Both R1 and R2 cell lines had greatly increased levels of p-glycoprotein expression while mrp expression levels were moderately increased but only R2 cells had raised caveolin levels compared to control A549 cells. Both caveolin-1 and p-glycoprotein colocalize in Triton-insoluble membrane domains in all our cell lines but only caveolins-1 was solubilized by the addition of octylglucoside at 4C suggesting that these two proteins are located in different membrane domains. Using an anti-caveolin-1 antibody, we did not succeed to immunoprecipitate p-glycoprotein. Interestingly, total cellular cholesterol (the major lipid component of caveolae and triton-insoluble domains) was greatly increased in both R1 and R2 cell lines compared to naive A549 cells.
Description
Revue
Cancer Biology and Therapy, Vol 3 (10), 954-959 (2004)
DOI
10.4161/cbt.3.10.1112
URL vers la version publiée
Mots-clés
caveolin , caveolae , Cytotoxic drugs , Multidrug resistance
Citation
Type de document
article de recherche