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miR-125b, a target of CDX2, regulates cell differentiation through repression of the core binding factor in

Kang-Yu Lin1, Xing-Ju Zhang1, Dan-Dan Feng1

  • 1Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory for Biocontrol, Sun Yat-sen University, Guangzhou 510275, China.

The Journal of Biological Chemistry
|September 10, 2011
PubMed

Insights

A new study reveals that the transcription factor CDX2 up-regulates microRNA-125b (miR-125b) in myeloid cells. This process inhibits core binding factor β (CBFβ) translation, promoting leukemogenesis and hindering myeloid cell differentiation.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • MicroRNA-125b (miR-125b) is deregulated and acts as an oncogene in various cancers, including hematopoietic malignancies.
  • The precise mechanisms driving miR-125b dysregulation in these cancers are not fully understood.
  • Identifying these mechanisms is crucial for understanding leukemogenesis and developing targeted therapies.

Purpose of the Study:

  • To identify factors contributing to miR-125b up-regulation in human hematopoietic malignancies.
  • To investigate the downstream targets of miR-125b involved in lineage-specific differentiation.
  • To elucidate the role of CDX2, miR-125b, and CBFβ in myeloid cell differentiation and leukemogenesis.

Main Methods:

  • Investigated the binding of transcription factor CDX2 to the miR-125b gene promoter.
  • Analyzed the effect of CDX2 levels on miR-125b expression in malignant myeloid cells.
  • Examined the impact of miR-125b on core binding factor β (CBFβ) translation.
  • Studied the role of all-trans-retinoic acid (ATRA) in modulating the CDX2-miR-125b-CBFβ pathway.

Main Results:

  • CDX2 directly binds to and activates the transcription of miR-125b in malignant myeloid cells.
  • Elevated CDX2 levels lead to increased miR-125b expression, which suppresses CBFβ translation.
  • This pathway inhibits myeloid cell differentiation, particularly granulocytic lineage, and promotes leukemogenesis.
  • All-trans-retinoic acid treatment reduces CDX2 activity, decreasing miR-125b transcription and restoring CBFβ levels, thereby inducing differentiation.

Conclusions:

  • A novel pathway involving CDX2, miR-125b, and CBFβ contributes to hematopoietic malignancies.
  • Deregulation of miR-125b and its associated factors represents a key mechanism in leukemogenesis.
  • Understanding this pathway provides new insights into the pathogenesis of hematopoietic malignancies and potential therapeutic targets.

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