TY - JOUR AB - The IL‑6R/JAK2/STAT3 pathway mediated by interleukin‑6 (IL‑6) plays an important role in the occurrence and development of multiple myeloma (MM), which is associated with decreased microRNA‑451a. However, the biological function of microRNA‑451a in MM remains unclear. The bone marrow (BM) of patients with MM was sampled, and the plasma cells were enriched. BM miR‑451a, IL‑6 and IL‑6R levels and Ki‑67 expression intensity were evaluated using reverse transcription‑quantitative PCR, ELISA and flow cytometry, respectively. U266 cell proliferation, viability and apoptosis were measured using BrdU, CCK‑8 and Annexin V/propidium iodide assays, respectively. Total and phospo‑(p‑)JAK2 and p‑STAT3 levels were measured by western blotting. Dual‑luciferase reporter assays were performed to validate the predicted target binding sites. miR‑451a expression was low in patients with MM and was associated with the Revised International Staging System (R‑ISS) stage. IL‑6 concentrations were significantly higher in patients with MM than in normal controls and were inversely associated with miR‑451a levels (r=‑0.96, P<0.0001). IL‑6R levels were positively correlated with the R‑ISS stage. miR‑451a was downregulated, and IL‑6R was upregulated in myeloma cell lines. Treatment with an miR‑451a mimic inhibited viability and induced apoptosis in U266 cells. p‑JAK2 and p‑STAT3 levels were significantly lower in mimic‑treated U266 cells than in control cells. Thus, miR‑451a was shown to regulate myeloma cell proliferation and apoptosis via the IL‑6R/JAK2/STAT3 pathway and may be used to predict patient prognosis. AD - Department of Clinical Laboratory, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan 610072, P.R. China Department of Pharmacy, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, Personalized Drug Therapy Key Laboratory of Sichuan Province, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan 610072, P.R. China Department of Hematology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, P.R. China AU - Zhong,Ling AU - Xu,Zhuyu AU - Jin,Xin AU - He,Yuan AU - Zhang,Jianbo AU - Jiang,Tao AU - Chen,Jiao DA - 2020/12/01 DO - 10.3892/ol.2020.12202 IS - 6 JO - Oncol Lett KW - microRNA‑451a interleukin‑6R JAK2/STAT3 multiple myeloma PY - 2020 SN - 1792-1074 1792-1082 SP - 339 ST - miR‑451a suppression of IL‑6R can inhibit proliferation and increase apoptosis through the JAK2/STAT3 pathway in multiple myeloma T2 - Oncology Letters TI - miR‑451a suppression of IL‑6R can inhibit proliferation and increase apoptosis through the JAK2/STAT3 pathway in multiple myeloma UR - https://doi.org/10.3892/ol.2020.12202 VL - 20 ER -