To overexpress miR21 in A20 cells, purified plasmids pGMLV-miR21 or control vector were transfected into HEK-293 T cells with package vectors using lipofectamine 2000. The supernatant of HEK-293 T cell culture was then condensed to a viral concentration of approximately 3 × 108 transducing units/ml. The lentiviral particles were incubated with A20 cells for 8 h. The stably transduced cells were selected by green fluorescence protein.
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