Journal: Journal of Cancer
Article Title: Downregulated Salt-inducible Kinase 3 Expression Promotes Chemoresistance in Serous Ovarian Cancer via the ATP‐binding Cassette Protein ABCG2
doi: 10.7150/jca.34886
Figure Lengend Snippet: ABCG2 upregulation is associated with SIK3 attenuation. (A) List of ABC family proteins from microarray data for which the expression changed more than 1.5-fold compared with control cells. (B) The mRNA expression levels of ABC proteins were verified by real-time PCR in OVCAR4 and SKOV3 cells. The white bar (shLuc) represents control cells, and the gray bar (shSIK3#01) and black bar (shSIK3#61) represent indicated cells with SIK3 knockdown. Data are represented as the mean ± SEM from three independent experiments and analyzed by one-way ANOVA. *: p <0.05 and **: p <0.01 (compared to the shLuc control). Note that ABCG1 and ABCG2 were both significantly upregulated in cells with SIK3 knocked down by shSIK3#01 and shSIK3#61. (C) The protein expression levels of ABCG1 and ABCG2 were further verified by Western blotting. Note that only ABCG2 was upregulated in OVCAR4 and SKOV3 cells with SIK3 knocked down by shSIK3#01 and shSIK3#61. (D) The functional MDR activity of the ABCG2 protein was determined using an MDR assay kit (Abcam). A total of 2 x 10 5 suspended cells were pretreated with the inhibitor novobiocin (50 nM) or DMSO. Then, diluted Efflux Gold Detection Reagent was added at 37°C for 30 minutes. The cellular orange fluorescence signal of the Efflux Gold Detection Reagent was measured immediately by flow cytometry in the living (PI-negative) cell population. The numbers in the upper left corners are MAF values.
Article Snippet: TRIzol-isolated RNA samples were shipped on dry ice to Welgene Biotech (Taiwan), where the gene expression microarray experiments were performed as a contract service.
Techniques: Microarray, Expressing, Control, Real-time Polymerase Chain Reaction, Knockdown, Western Blot, Functional Assay, Activity Assay, Fluorescence, Flow Cytometry