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Issue 10, 2015
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Potent inhibition of miR-27a by neomycin–bisbenzimidazole conjugates

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Abstract

miRNAs are important components of regulatory networks that control gene expression and have implications in various diseases including cancer. Targeting oncogenic miRNAs with small molecules is currently being explored to develop cancer therapeutics. Here, we report the development of dual binding neomycin–bisbenzimidazole conjugates that target oncogenic miR-27a with high affinity (Ka = 1.2 to 7.4 × 108 M−1). These conjugates bring significant reduction (∼65% at 5 μM) in mature miRNA levels and penetrate easily in the cells where they localise both in the cytoplasm and the nucleus. Cell cycle analysis showed significant increase in the G0/G1 phase (∼15%) and decrease in the S phase (∼7%) upon treatment with neomycin–bisbenzimidazole conjugates, suggesting inhibition of cell proliferation. Using the conjugation approach, we show that moderately binding ligands can be covalently combined into high affinity binders. This study also highlights the role of linker optimization in designing high affinity ligands for miR-27a targeting.

Graphical abstract: Potent inhibition of miR-27a by neomycin–bisbenzimidazole conjugates

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Publication details

The article was received on 02 Jun 2015, accepted on 07 Jul 2015 and first published on 09 Jul 2015


Article type: Edge Article
DOI: 10.1039/C5SC01969A
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Chem. Sci., 2015,6, 5837-5846
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    Potent inhibition of miR-27a by neomycin–bisbenzimidazole conjugates

    S. Nahar, N. Ranjan, A. Ray, D. P. Arya and S. Maiti, Chem. Sci., 2015, 6, 5837
    DOI: 10.1039/C5SC01969A

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