:: Volume 22, Issue 3 (5-2018) ::
ibj 2018, 22(3): 171-179 Back to browse issues page
Nanocurcumin-Mediated Down-Regulation of Telomerase Via Stimulating TGFβ1 Signaling Pathway in Hepatocellular Carcinoma Cells
Molood Shariati , Samira Hajigholami , Ziba Veisi Malekshahi , Maliheh Entezari , Narges Bodaghabadi , Majid Sadeghizadeh *
Background: Curcumin, extracted from turmeric, represents enormous potential to serve as an anticancer agent. Telomerase is viewed as a prominent molecular target of curcumin, and transforming growth factor-β1 (TGFβ1) has proven to be a major inhibitory signaling pathway for telomerase activity. In the current study, we aimed to explore suppressive effects of nanocurcumin on telomerase expression through TGFβ1 pathway in a hepatocellular carcinoma cell line (Huh7). Methods: MTT assay was used to determine the effect of nonocurcumin on viability of Huh7 cells. RT-PCR was used to analyze the gene expression patterns. Results: MTT assay revealed that nanocurcumin acts in a dose- and time-dependent manner to diminish the cell viability.
RT-PCR analysis indicated that nanocurcumin results in augmentation of TGFβ1 72 hours post treatment and leads to the reduction of telomerase expression 48 and 72 hours post exposure. Also, up-regulation of Smad3 and E2F1 and down-regulation of Smad7 confirmed the effect of nanocurcumin on intermediate components of TGFβ1 pathway. Furthermore, transfection of the proximal promoter of telomerase triggered a significant
reduction in luciferase activity. Conclusion: The data from the present study lead us to develop a deeper understanding of the mechanisms underlying nanocurcumin-mediated regulation of telomerase expression, thereby presenting a new perspective to the landscape of using nanocurcumin as a cancer-oriented therapeutic agent.
Keywords: Hepatocellular carcinoma, Telomerase, Gene expression
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Type of Study: Full Length | Subject: Molecular Genetics & Genomics

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Volume 22, Issue 3 (5-2018) Back to browse issues page