MiR-126 regulated breast cancer cell invasion by targeting ADAM9.
Accumulating evidence has shown that microRNAs (miRNAs) deregulation is commonly observed in human malignancies and crucial to cancer metastasis. Herein, we demonstrated that miR-126 play a suppressor role in human breast cancer cells invasion through the direct repression of a disintegrin and metalloprotease 9 (ADAM9). MiR-126 expression was investigated in forty cases of breast cancer specimens by real-time PCR. Transwell assay was conducted to explore the effects of miR-126 on the invasion of human breast cancer cell lines. The impact of miR-126 overexpression on putative target ADAM9 was subsequently confirmed by Western blot analysis. Our results indicated that miR-126 expression was frequently down-regulated in breast cancer specimens compared with adjacent normal tissues (P<0.05). Overexpression of miR-126 significantly reduced (P<0.05) the protein levels of ADAM9, further suppressed (P<0.05) breast cancer cell invasion in vitro. Meanwhile, knockdown of ADAM9 by small interfering RNA (siRNA) also inhibited (P<0.05) breast cancer cell invasion. Thus, our study revealed that miR-126 may act as a tumor suppressor via inhibition of cell invasion by downregulating ADAM9 in breast cancer development.
Department of Breast Surgery, The Affiliated Tumor Hospital of Zhengzhou University Zhengzhou 450008, Henan, P.R. China.
Cheng-Zheng
CZ
Wang
Department of Breast Surgery, The Affiliated Tumor Hospital of Zhengzhou University Zhengzhou 450008, Henan, P.R. China.
Peng
P
Yuan
Department of Thoracic Surgery, The Affiliated Tumor Hospital of Zhengzhou University Zhengzhou 450008, Henan, P.R. China.
Yin
Y
Li
D051722:ADAM Proteins / Q000235:genetics / Q000378:metabolism*; D015153:Blotting, Western; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D002465:Cell Movement; D049109:Cell Proliferation; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D061986:MCF-7 Cells; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D035683:MicroRNAs / Q000235:genetics / Q000378:metabolism*; D009361:Neoplasm Invasiveness; D034622:RNA Interference; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D014162:Transfection
C527111:MIRN126 microRNA, human; D008565:Membrane Proteins; D035683:MicroRNAs; D051722:ADAM Proteins; C098339:ADAM9 protein, human
ADAM9; MiR-126; breast cancer; invasion