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MicroRNA-196a increases apoptosis in B cells through downregulation of FOXO1

Soyoung Kim1, Mina Han1, Hyun Ju Hwang1

  • 1Asan Institute for Life Sciences and Department of Convergence Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.

Molecules and Cells
|May 22, 2025
PubMed

Insights

MicroRNA-196a-5p (miR-196a-5p) regulates B-cell malignancies by targeting FOXO1. Upregulating miR-196a-5p increases apoptosis in B cells, suggesting its therapeutic potential in B-cell cancers.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Immunology

Background:

  • MicroRNAs (miRNAs) are crucial in cancer development, with altered expression common in cancer cells.
  • While miR-196a-5p's role is known in some cancers, its function in B-cell malignancies remains less explored.
  • Understanding miRNA regulation is vital for developing targeted cancer therapies.

Purpose of the Study:

  • To investigate the role and regulatory mechanisms of miR-196a-5p in B cells.
  • To determine if miR-196a-5p influences B-cell lymphoma cell lines and primary B lymphocytes.
  • To identify the downstream targets of miR-196a-5p in the context of B-cell activation and malignancy.

Main Methods:

  • Utilized a human diffuse large B-cell lymphoma cell line (SU-DHL-6) and mouse B lymphocytes.
  • Performed enforced expression of miR-196a in SU-DHL-6 cells to assess apoptosis.
  • Conducted luciferase assays to identify direct targets of miR-196a-5p.
  • Analyzed mRNA and protein expression levels of target genes.
  • Investigated miR-196a-5p expression in different B-cell populations and its correlation with B-cell receptor stimulation.

Main Results:

  • Enforced miR-196a expression enhanced daunorubicin-induced apoptosis in SU-DHL-6 cells.
  • FOXO1 was identified as a direct target of miR-196a-5p, with its expression downregulated upon miR-196a-5p overexpression.
  • miR-196a-5p was highly expressed in mouse bone marrow B cells compared to splenic B cells, showing an inverse correlation with FOXO1 levels.
  • miR-196a-5p expression increased with B-cell receptor stimulation, inversely correlating with FOXO1.
  • Upregulation of miR-196a-5p in primary murine B cells led to increased apoptosis.

Conclusions:

  • miR-196a-5p acts as a post-transcriptional regulator of FOXO1.
  • The findings highlight miR-196a-5p's significant role in regulating B-cell malignancies.
  • miR-196a-5p is implicated in the activation and apoptosis of B cells, suggesting its potential as a therapeutic target.
Keywords:
ApoptosisB-cell activationB-cell lymphomaFOXO1MicroRNA-196a-5p

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