Let7a-5p miRNA Inhibits STAT3 Signaling in Multiple Myeloma

Example 6

Human multiple myeloma cancer cells are known to undergo increased cell division through IL-6-triggered STAT3 signaling. Numerous studies have shown that let7a-5p miRNA (SEQ ID NO:2) inhibits the activity of Signal Transducer and Activator of Transcription 3 (STAT3). Human multiple myeloma cells MM.1S were incubated for 48 hrs daily with 10 μg/ml polymer-modified let7a-5p miRNA as indicated and expression of the STAT3 target gene, oncogenic Bcl-xL gene, was analyzed by RT-PCR. As shown in FIG. 12B, incubation with PS polymer-modified let7a-5p miRNA inhibited expression of Bcl-xL gene.