Abstract:
:Shikonin (SK), a naturally occurring naphthoquinone, exhibits antitumor activity. However, its precise mechanisms of action are unknown. In the present study, the effects of SK on NCI-H460 human lung cancer cells were investigated. It was found that SK reduced cell viability and induced apoptosis in the NCI-H460 cells. Additionally, SK inhibited extracellular signal-regulated kinase (ERK) activity, which indicates that inhibition of the ERK pathway is probably one of the mechanisms by which SK induced NCI-H460 cell apoptosis. The expression of Cbl-b was significantly increased by treatment with SK for 4 h, and gradually increased to a maximal level at 24 h; the time taken for the upregulation of Cbl-b protein was in accordance to that required for the downregulation of phospho (p)-ERK protein. The Cbl inhibitor Ps341 reversed the SK-induced downregulation of p-ERK and apoptosis of NCI-H460 cells. These results indicate that Cbl-b potentiates the apoptotic action of SK by inhibiting the ERK pathway in lung cancer cells.
journal_name
Exp Ther Medjournal_title
Experimental and therapeutic medicineauthors
Qu D,Chen YU,Xu XM,Zhang M,Zhang YI,Li SQdoi
10.3892/etm.2015.2283subject
Has Abstractpub_date
2015-04-01 00:00:00pages
1265-1270issue
4eissn
1792-0981issn
1792-1015pii
etm-09-04-1265journal_volume
9pub_type
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