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Clinicopathological Analysis of miRNA Expression in Breast Cancer Tissues by Using miRNA In Situ Hybridization
06:01

Clinicopathological Analysis of miRNA Expression in Breast Cancer Tissues by Using miRNA In Situ Hybridization

Published on: June 7, 2016

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Inhibition of breast cancer cell proliferation with anti-microRNA oligonucleotides flanked by interstrand

Sho Okumura1,2,3, Yu Hirano1,3, Yasuo Komatsu1,4

  • 1Graduate School of Life Science, Hokkaido University, Sapporo, Japan.

Nucleosides, Nucleotides & Nucleic Acids
|October 5, 2019
PubMed

Insights

New anti-microRNA oligonucleotides (AMOs) modified with interstrand cross-linked duplexes (CLDs) show promise for breast cancer treatment. This CLD-modified AMO effectively suppressed breast cancer cell growth and restored tumor suppressor gene expression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Breast cancer is a prevalent global cancer in women, often developing resistance to conventional therapies like chemotherapy and hormone therapy.
  • MicroRNA regulation represents a novel therapeutic avenue for breast cancer, addressing its inherent heterogeneity and drug resistance.
  • Anti-microRNA oligonucleotides (AMOs) are key agents in oligonucleotide therapy, with potential for enhanced efficacy.

Purpose of the Study:

  • To investigate the efficacy of anti-microRNA-21 (miR-21) AMO modified with interstrand cross-linked duplexes (CLDs) in breast cancer cells.
  • To evaluate the impact of CLD modification on AMO stability, nuclease resistance, and hybridization with target RNA.
  • To assess the effect of CLD-modified AMOs on breast cancer cell proliferation and the expression of miR-21-regulated tumor suppressor genes.

Main Methods:

  • Development and application of anti-miR-21 oligonucleotides (AMOs) modified with interstrand cross-linked duplexes (CLDs).
  • In vitro assessment of CLD-modified AMO effects on breast cancer cell proliferation without reporter assays.
  • Analysis of miR-21-controlled tumor suppressor gene expression following CLD-modified AMO treatment.

Main Results:

  • The CLD-modified anti-miR-21 AMO demonstrated prolonged suppression of breast cancer cell proliferation compared to unmodified AMOs.
  • The modification enhanced the stability and hybridization of the AMO, leading to improved therapeutic effect.
  • CLD-modified AMOs successfully up-regulated the expression of tumor suppressor genes targeted by miR-21.

Conclusions:

  • Interstrand cross-linked duplex (CLD) modification significantly enhances the efficacy and duration of anti-microRNA oligonucleotide (AMO) activity against breast cancer.
  • CLD-modified AMOs represent a promising therapeutic strategy for breast cancer, offering improved stability and targeted gene regulation.
  • This approach holds potential for overcoming drug resistance and improving treatment outcomes in breast cancer patients.
Keywords:
Antisense oligonucleotides;breast cancer;miR-21microRNA;modified oligonucleotides;

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