PT  - JOURNAL ARTICLE
AU  - LINGE, ANNETT
AU  - MORISHIMA, NOBUHIRO
AU  - KASPER, MICHAEL
AU  - BARTH, KATHRIN
TI  - Bleomycin Induces Caveolin-1 and -2 Expression in Epithelial Lung Cancer A549 Cells
DP  - 2007 May 01
TA  - Anticancer Research
PG  - 1343--1351
VI  - 27
IP  - 3A
4099  - http://ar.iiarjournals.org/content/27/3A/1343.short
4100  - http://ar.iiarjournals.org/content/27/3A/1343.full
SO  - Anticancer Res2007 May 01; 27
AB  - Background: Bleomycin induces apoptosis in alveolar epithelial cells. The expression of caveolin-1 and -2 in lung epithelial-derived A549 cells was analysed in terms of apoptosis after exposure to bleomycin. Materials and Methods: Apoptosis was investigated using flow cytometry, ELISA, immunohistochemistry and Western blot analysis. Caveolin-1 and -2 were determined at the protein level (Western blot). Intracellular caveolin-1 distribution was studied with immunofluorescence, as well as sucrose density gradient centrifugation. Results: Caveolin-1 and -2 were up-regulated 1 h after exposure to bleomycin and preceding the occurrence of caspase-8, and of caspase-3 and caspase-9 cleavage products. Sucrose density gradient centrifugation revealed that bleomycin exposure led to a partial translocation of caveolin-1 from caveolin-rich membrane fractions to non-raft fractions. Successful inhibition of bleomycin-induced apoptosis by the broad-spectrum caspase inhibitor zVAD-fmk did not influence the amount of caveolin-1 and -2. Conclusion: The early up-regulation of caveolin-1 and -2 following bleomycin exposure is a rather apoptosis-independent event related to other unknown mechanisms of bleomycin-mediated cell injury. Copyright© 2007 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved