USP39 Depletion Suppresses Cell Proliferation, Induces Apoptosis, and decreases Clonogenicity in OPM2 and KMM1 Multiple Myeloma Cells. A OPM2 cells were transfected with either control or two different single USP39 siRNA (siUSP39 #1 and siUSP39 #2) for 96 h. Then, lysates from these cells were subjected to immunoblots using GAPDH and USP39 antibodies (upper part). In parallel, the percentage of cell death was measured by flow cytometry after IP staining (left lower part) and cell metabolism was assessed by XTT assay (right lower part). B KMM1 were treated as described for OPM2 cells and subjected to the same analysis. C OPM2 cells were transfected with either control or single USP39 siRNAs for 96 h or stimulated with BTZ for 48 h. Lysates from these cells were subjected to immunoblots using GAPDH and USP39 antibodies (upper left). In parallel, the clonogenic capacity of the cells was measured after 10 days within a semi-solid medium. The quantification of the clonogenic assay is reported in the upper right part of the figure. Representative pictures were shown in the lower part. D KMM1 were treated as described for OPM2 cells and subjected to the same analysis. E KMM1 cells were either transfected with Control or USP39 siRNAs for 24 h. Then cells were transfected with Myc-Tag or Myc-USP39 vectors. After 72 h, lysates from these cells were subjected to immunoblots using GAPDH, myc-Tag or USP39 antibodies (left part). After 96 h of transfections, cell metabolism was measured in each condition (right part)
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