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Selective arm-usage of pre-miR-1307 dysregulates angiogenesis and affects breast cancer aggressiveness

  • 0Division of Molecular Genome Analysis, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, Heidelberg, 69120, Germany.
Bmc Biology +

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January 24, 2025

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January 24, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

MicroRNAs (miRNAs) are implicated in breast cancer. This study reveals miR-1307-5p suppresses tumor growth and angiogenesis, offering potential therapeutic targets for breast cancer.

Area Of Science

  • Molecular Biology
  • Oncology
  • Genetics

Background

  • Breast cancer remains a leading cause of cancer mortality in women.
  • MicroRNA (miRNA) deregulation is common in breast cancer, impacting tumor biology.
  • The specific roles of pre-microRNA-1307 and its mature forms in breast cancer were previously uninvestigated.

Purpose Of The Study

  • To investigate the role of pre-microRNA-1307 and its derived miRNAs in breast cancer.
  • To elucidate the functional impact of miR-1307-5p on breast cancer progression and angiogenesis.
  • To explore the regulatory mechanisms of miRNA arm selection in breast cancer.

Main Methods

  • Analysis of miRNA expression in human breast cancer tissues.
  • Overexpression of pre-miR-1307 in breast cancer cell lines.
  • Assessment of xenograft growth and angiogenesis in vivo.
  • Secretome analysis and endothelial cell sprouting assays.
  • Correlation analysis between miRNA expression and tumor characteristics.

Main Results

  • Three mature miRNA species from pre-miR-1307 were significantly upregulated in breast cancer tissues.
  • Overexpression of pre-miR-1307 reduced tumor growth and angiogenesis.
  • miR-1307-5p overexpression altered the cancer cell secretome and inhibited endothelial cell sprouting.
  • miR-1307-5p expression inversely correlated with endothelial cell fractions in tumors, indicating an anti-angiogenic role.
  • Coordinated regulation of miRNA arm usage suggests a common underlying mechanism.

Conclusions

  • miR-1307-5p exhibits tumor-suppressive activity by reducing angiogenesis in breast cancer, counteracting oncogenic miR-1307-3p.
  • These findings highlight the significance of miRNA arm selection regulation in cancer.
  • The identified mechanisms may pave the way for novel therapeutic strategies targeting miRNA balance in cancer treatment.

Keywords:

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