Antigene and Antiproliferative Effects of Triplex-Forming Oligonucleotide (TFO) Targeted on hmgb1 Gene in Human Hepatoma Cells

Author(s): Neelam Lohani, Moganty R. Rajeswari*

Journal Name: Anti-Cancer Agents in Medicinal Chemistry
(Formerly Current Medicinal Chemistry - Anti-Cancer Agents)

Volume 20 , Issue 16 , 2020

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Graphical Abstract:


Background: The high mobility group box 1 (hmgb1) is one of the frequently over-expressed genes whose aberrant expression is reported in a number of human cancers. Various strategies are underway to inhibit hmgb1 expression in cancer cells having considerable therapeutic value.

Objective: The present work involves selective transcriptional inhibition of the hmgb1 gene using selective DNA triplex structure-based gene technology. Here, the promoter region of the hmgb1 gene at position (-183 to -165) from the transcription start site as a target was selected using bioinformatic tools.

Methods: The DNA triplex formation by the DNA of the target gene and TFO was confirmed using UV absorption spectroscopy, Circular Dichroism, and Isothermal Calorimetry.

Results: Treatment of HepG2 cell with specific Triplex-forming Oligonucleotide significantly downregulated HMGB1 expression level at mRNA and protein levels by 50%, while the classical anticancer drugs, actinomycin/ adriamycin as positive controls showed 65% and the combination of TFO and drug decreased by 70%. The anti-proliferative effects of TFO correlated well with the fact of accumulation of cells in the Go phase and apoptotic cell death. Further, the binding of anti-cancer drugs to hmgb1 is stronger in DNA triplex state as compared to hmgb1 alone, suggesting the combination therapy as a better option.

Conclusion: Therefore, the ability of hmgb1 targeted triplex-forming oligonucleotide in combination with triplex selective anticancer drug holds promise in the treatment of malignancies associated with hmgb1 overexpression. The result obtained may open up new vistas to provide a basis for the rational drug design and searching for high-affinity ligands with a high triplex selectivity.

Keywords: HMGB1, DNA triplex, triplex-forming oligonucleotide, hepatocellular carcinoma, antigene, transcription.

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Article Details

Year: 2020
Published on: 05 November, 2020
Page: [1943 - 1955]
Pages: 13
DOI: 10.2174/1871520620666200619170438
Price: $65

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