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Lin28/let-7 axis in breast cancer.

P Shaik Syed Ali1, Md Parwez Ahmad2, K M Huria Parveen2

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|March 14, 2025
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Reduced let-7 microRNA levels and Lin28A/Lin28B overexpression are hallmarks of aggressive breast cancer. This interplay drives cancer progression and treatment resistance, suggesting novel therapeutic targets.

Keywords:
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Area of Science:

  • Molecular Oncology
  • MicroRNA Biology
  • Cancer Therapeutics

Background:

  • Let-7 microRNAs function as tumor suppressors, with their diminished expression correlating with poor prognosis in breast cancer.
  • Lin28A and Lin28B proteins are frequently overexpressed in breast cancer, inversely correlating with let-7 levels and Wnt signaling dysregulation.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying the Lin28A/Lin28B-let-7 microRNA axis in breast cancer.
  • To explore the role of this axis in breast carcinogenesis, metastasis, and therapeutic resistance.
  • To identify potential therapeutic strategies targeting this pathway.

Main Methods:

  • Review of existing literature on let-7 microRNAs, Lin28A, Lin28B, and Wnt signaling in breast cancer.
  • Analysis of molecular interplay and cellular compartments involved in let-7 biogenesis inhibition.
  • Examination of oncogene regulation by let-7 and its clinical implications across breast cancer subtypes.

Main Results:

  • Lin28A and Lin28B inhibit let-7 microRNA biogenesis, leading to oncogene overexpression (e.g., K-ras, C-myc, SOX-2).
  • Lin28A overexpression is linked to reduced let-7 in ER+, ER-, and HER2+ breast cancers.
  • Lin28B overexpression with reduced let-7 is specific to triple-negative breast cancer.

Conclusions:

  • The Lin28A/Lin28B-let-7 axis is a critical regulator of breast cancer progression, metastasis, and treatment resistance.
  • Targeting let-7 microRNAs, their mimics, or Lin28A/Lin28B inhibitors presents promising therapeutic avenues for breast cancer treatment.