Inhibition of oleandrin on the proliferation and invasion of osteosarcoma cells in vitro by suppressing Wnt-β-catenin signaling pathwayReport as inadecuate




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Journal of Experimental and Clinical Cancer Research

, 34:115

First Online: 06 October 2015Received: 06 July 2015Accepted: 30 September 2015DOI: 10.1186-s13046-015-0232-8

Cite this article as: Ma, Y., Zhu, B., Liu, X. et al. J Exp Clin Cancer Res 2015 34: 115. doi:10.1186-s13046-015-0232-8

Abstract

BackgroundOsteosarcoma OS is a high-grade bone sarcoma with early metastasis potential, and the clinical chemotherapy drugs that are currently used for its treatment have some limitations. Recently, several studies have reported the selective antitumor effect of oleandrin on various tumor cells. In this study, we aimed to evaluate the effects and underlying mechanisms of oleandrin on OS cells.

MethodsThe effect of oleandrin on the proliferation, morphology, and apoptosis of U2OS and SaOS-2 cells were analyzed in vitro. The activity of the Wnt-β-catenin signaling pathway was determined using a dual luciferase assay. Semi-quantitative RT-PCR and western blot assays were performed to evaluate the mRNA and total protein expression of the downstream target genes. Changes of β-catenin in intracellular localization were also explored using a western blot after separating the nucleus and cytoplasm proteins. The MMP-2 and MMP-9 enzymatic activities were determined using gelatin zymography.

ResultsOleandrin significantly inhibited the proliferation and invasion of OS cells in vitro, and induced their apoptosis. After treatment with oleandrin, the TOP-FOP flash ratio in OS cells was noticeably decreased, which indicated that the Wnt-β-catenin signaling pathway was repressed. The expression of related Wnt target genes and total β-catenin was downregulated, and a reduced nuclear β-catenin level by oleandrin was observed as well. In addition, oleandrin suppressed the activities of MMP-2 and MMP-9.

ConclusionsOleandrin, in vitro, exerted a strong antitumor effect on human OS cells by suppressing the Wnt-β-catenin signaling pathway, which interfered with the proliferation and invasion of OS cells, as well as induced cells apoptosis. Moreover, the expression and activities of MMP-2 and MMP-9 were downregulated by oleandrin, which contributed to the cells’ lower invasiveness.

KeywordsOsteosarcoma Oleandrin Proliferation Invasion Wnt-β-catenin signaling Antitumor activity AbbreviationsOSOsteosarcoma

TCF-LEFT-cell factor-lymphocyte enhancer factor

MMPsMatrix metalloproteinase

DAPIDye 4’-6-diamidino-2-phenylindole

NF-κBNuclear transcription factor-κB

AP-1Activator protein-1

GSK 3βGlycogen synthase kinase 3β

APCAdenomatous polyposis coli

FzFrizzled

LRP5-6Lipoprotein receptors 5-6

DshDisheveled

FCMFlow cytometry

PIPropidium iodide

SDStandard deviation

ANOVAAnalysis of variance

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Author: Yunlong Ma - Bin Zhu - Xiaoguang Liu - Huilei Yu - Lei Yong - Xiao Liu - Jia Shao - Zhongjun Liu

Source: https://link.springer.com/







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