Background: miR-886-5p plays an important role in many tumors, but it has been rarely investigated in multiple myeloma (MM). We studied the expression of miR-886-5p in the plasma of MM patients and in MM cell lines, and evaluated its biological function to identify its potential involvement in MM. Methods: We recruited 16 subjects including 10 newly diagnosed MM patients who had not received treatment and 6 healthy individuals. The expression of miR-886-5p in plasma and MM cell lines was examined by quantitative reverse transcription polymerase chain reaction. Cell Counting Kit-8, colony formation assay, and 7-amino-actinomycin D/allophycocyanin double staining were performed to detect the function of miR-886-5p in MM cell lines. The expression of Bax and p53 was determined by western blot. Results: The expression of miR-886-5p in the plasma of MM patients was higher than that in normal individuals and its level in MM cell lines was higher than that in peripheral blood mononuclear cells isolated from healthy individuals. miR-886-5p could trigger the cell proliferation and inhibition of apoptosis and affect the cell cycle. Conclusion: miR-886-5p triggered MM cell growth and may act as a diagnostic plasma biomarker for MM, potentially contributing to resistance to chemotherapy.

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