Related Experiment Video

Updated: Jun 16, 2025

Integration of Bioinformatics Approaches and Experimental Validations to Understand the Role of Notch Signaling in Ovarian Cancer
09:08

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Published on: January 12, 2020

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The NOTCH1 and miR-34a signaling network is affected by TP53 alterations in CLL

Alena Sophie Ehrmann1,2, Alex Zadro1, Eugen Tausch1,3

  • 1Division of CLL, Department of Internal Medicine III, University Hospital of Ulm, Ulm, Germany.

Leukemia & Lymphoma
|August 20, 2024
PubMed

Insights

In chronic lymphocytic leukemia (CLL), TP53 alterations impact NOTCH1 signaling. p53 activation boosts miR-34a and NOTCH1, but their levels decrease in TP53-altered CLL, suggesting complex interactions and potential therapeutic targets.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • TP53 mutations/deletions in CLL correlate with poor prognosis and reduced miR-34a.
  • NOTCH1 signaling is hyperactivated and critical for CLL progression.
  • miR-34a targets NOTCH1, suggesting a regulatory relationship.

Purpose of the Study:

  • To investigate the interplay between p53, miR-34a, and NOTCH1 in CLL.
  • To explore how p53 and miR-34a influence NOTCH1 signaling and expression in TP53-altered CLL cells.

Main Methods:

  • Analysis of p53, miR-34a, and NOTCH1 interactions in CLL cells.
  • Investigating the effect of p53 and miR-34a on NOTCH1 signaling and expression.
  • Assessing NOTCH1 3' UTR activity and BCL-2 levels.

Main Results:

  • miR-34a reduces NOTCH1 3' UTR activity but may not mediate p53-NOTCH1 interaction.
  • p53 activation increases miR-34a and NOTCH1 protein levels.
  • TP53-altered CLL cells show decreased NOTCH1 and miR-34a, with some exhibiting elevated BCL-2.

Conclusions:

  • The p53-miR-34a-NOTCH1 network in CLL is complex.
  • A potential direct p53-NOTCH1 relationship may involve anti-apoptotic mechanisms via BCL-2.
  • Findings offer insights for developing novel therapeutic strategies for CLL.
Keywords:
CLLNOTCH1miR-34ap53signaling network

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