Abstract:
:Ouabain, a cardiac glycoside found in plants, is primarily used in the treatment of congestive heart failure and arrhythmia because of its ability to inhibit Na(+)/K(+)-ATPase pump. Recently ouabain has been shown to exert anticancer effects but the underlying mechanism is not clear. Here, we explored the molecular mechanism by which ouabain exerts anticancer effects in human lung adenocarcinoma. Employing proteomic techniques, we found 7 proteins downregulated by ouabain in A549 including p-ezrin, a protein associated with pulmonary cancer metastasis in a dose-dependent manner. In addition, when the relative phosphorylation levels of 39 intracellular proteins were compared between control and ouabain-treated A549 cells, p-Src (Y416) was also found to be downregulated by ouabain. Furthermore, western blot revealed the ouabain-mediated downregulation of p-FAK (Y925), p-paxillin (Y118), p130CAS, and Na(+)/K(+)-ATPase subunits that have been shown to be involved in the migration of cancer cells. The inhibitory effect of ouabain and Src inhibitor PP2 on the migration of A549 cells was confirmed by Boyden chamber assay. Anticancer effects of ouabain in A549 cells appear to be related to its ability to regulate and inactivate Src-to-ezrin signaling, and proteins involved in focal adhesion such as Src, FAK, and p130CAS axis are proposed here.
journal_name
Biomed Res Intjournal_title
BioMed research internationalauthors
Shin HK,Ryu BJ,Choi SW,Kim SH,Lee Kdoi
10.1155/2015/537136subject
Has Abstractpub_date
2015-01-01 00:00:00pages
537136eissn
2314-6133issn
2314-6141journal_volume
2015pub_type
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journal_title:BioMed research international
pub_type: 杂志文章,评审
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pub_type: 杂志文章,评审
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doi:10.1155/2013/703130
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doi:10.1155/2016/8329513
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pub_type: 杂志文章,收录出版
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