Effects of miR-155 Antisense Oligonucleotide on Breast Carcinoma Cell Line MDA-MB-157 and Implanted Tumors

Zheng, Shu-Rong; Guo, Gui-Long; Zhai, Qi; Zou, Zhang-Yong; Zhang, Wei

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자료유형: 학술저널

저자정보: Zheng, Shu-Rong (Department of Oncology, The First Affiliated Hospital of Wenzhou Medical College) Guo, Gui-Long (Department of Oncology, The First Affiliated Hospital of Wenzhou Medical College) Zhai, Qi (Department of Oncology, The First Affiliated Hospital of Wenzhou Medical College) Zou, Zhang-Yong (Department of Oncology, The First Affiliated Hospital of Wenzhou Medical College) Zhang, Wei (Department of Oncology, The First Affiliated Hospital of Wenzhou Medical College)

저널정보: 아시아태평양암예방학회 Asian Pacific journal of cancer prevention : APJCP Asian Pacific journal of cancer prevention : APJCP 제14권 제4호

발행연도: 2013.1

수록면: 2,361 - 2,366 (6page)

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Diverse studies have shown that miR-155 is overexpressed in different tumor types. However, the precise molecular mechanism of the ectopic expression of miR-155 in breast cancer is still poorly understood. To further explore the role of miR-155 in breast tumorigenesis, we here assessed the influence of miR-155 antisense oligonucleotide (miR-155 ASO) on MDA-MB-157 cell viability and apoptosis in vitro. Furthermore, the effects of inhibitory effects of miR-155 on the growth of xenograft tumors in vivo were determined with performance of immunohistochemistry to detect expression of caspase-3, a pivotal apoptosis regulatory factor, in xenografts. Transfection efficiency detected by laser confocal microscope was higher than 80%. The level of miR-155 expression was significantly decreased (P<0.05) in the cells transfected with miR-155 ASO, compared with that in cells transfected with a negative control. After being transfected with miR-155 ASO, the viability of MDA-MB-157 cells was reduced greatly (P<0.05) and the number of apoptotic cells was increased significantly. Additionally, miR-155 ASO inhibited the growth of transplanted tumor in vivo and significantly increased the expression of caspase-3. Taken together, our study revealed that miR-155 ASO can induce cell apoptosis and inhibit cell proliferation in vitro. Moreover, miR-155 ASO could significantly repress tumor growth in vivo, presumably by inducing apoptosis via caspase-3 up-regulation. These findings provide experimental evidence for using miR-155 as a therapeutic target of breast carcinoma.

#Breast neoplasms #microRNA-155 #antisense oligonucleotide #MDA-MB-157 cells #nude mice

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