HERG suppresses the malignant phenotypes of osteosarcoma via modulating NF-κB pathway
WU Jin, CHEN Zhi-Da, ZENG Wen-Rong, LIN Bin, WU Xin-Yu, LIU Qing-Jun
2016, 43 (7):
508-514.
doi: 10.3760/cma.j.issn.1673422X.2016.07.007
ObjectiveTo detect the expression of HERG (human etheràgogorelated gene) potassium channel in human osteosarcoma, and explore the effects of silencing HERG by small interfering RNA (siRNA) on the proliferation and apoptosis of osteosarcoma cells and the mechanisms responsible for HERG regulation. MethodsThe expressions of HERG in osteosarcoma MG63 cells and tissues were detected by reverse transcription polymerase chain reaction (RTPCR), Western blotting and immunohistochemistry. Next, osteosarcoma cells were divided into three groups: HERGsiRNA group, controlsiRNA group and blank group. CCK8, colony formation, flow cytometry and Tunel assay were used to measure the proliferation and apoptosis of the osteosarcoma cells. Finally, Western blotting analysis was performed to detect the expression of nuclear factorκB (NFκB) pathway in osteosarcoma cells treated with HERG siRNA. ResultsOsteosarcoma cells and tissues were found to highly express HERG. Inhibition of HERG in the osteosarcoma cells significantly inhibited the cell proliferation and induced cell apoptosis. Compared to controlsiRNA group or blank group, HERGsiRNA could inhibit the proliferation of MG63 cells significantly [HERGsiRNA group: (75.34±4.45)%; compared to controlsiRNA group: (100.60±5.31)%; t=3.64, P=0.007; compared to blank group: (100.00±5.66)%; t=3.43, P=0.009]. The similar results were obtained from colony formation assay (HERGsiRNA group: 134.30±11.82; compared to controlsiRNA group: 225.30±11.56; t=5.51, P=0.002; compared to blank group: 232.80±12.21; t=5.80, P=0.001). HERGsiRNA transfected MG63 cells demonstrated a significant increase of apoptotic rate compared to controlsiRNA transfected cells or untreated cells [HERGsiRNA group: (28.10±2.21)%; compared to controlsiRNA group: (9.36±2.42)%; t=5.72, P=0.005; compared to blank group: (10.92±2.51)%; t=5.14, P=0.007]. This result was further confirmed by Tunel assay. The cells transfected with HERGsiRNA (31.57±2.08)% demonstrated extensive apoptosis, compared with the controlsiRNA group [(10.35±1.82)%; t=7.69, P=0.002)] or blank group [(7.96±0.88)%; t=10.48, P=0.001]. Silencing HERG gene downregulated the cIAP1, XIAP, Bcl2, Survivin, PIκBα and NFκB p65 expression, compared to the control groups. ConclusionHERG is highly expressed in osteosarcoma. HERG silencing can suppress osteosarcoma progression through NFκB pathway and suggest that HERG may be a novel molecular target for osteosarcoma therapy and diagnosis.
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