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MicroRNA-15/16 Antagonizes Myb To Control NK Cell Maturation

Ryan P Sullivan1, Jeffrey W Leong1, Stephanie E Schneider1

  • 1Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110; and.

Journal of Immunology (Baltimore, Md. : 1950)
|August 14, 2015
PubMed

Insights

The miR-15/16 microRNA family is crucial for natural killer (NK) cell maturation. It controls this process by regulating the transcription factor c-Myb (Myb), preventing NK cell immaturity.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Development

Background:

  • Natural killer (NK) cells mature in peripheral organs, but the molecular mechanisms governing this process are not fully understood.
  • The miR-15/16 microRNA family is highly expressed in NK cells and influences fundamental cellular functions.

Purpose of the Study:

  • To investigate the role of the miR-15/16 family in NK cell maturation.
  • To elucidate the molecular pathway through which miR-15/16 regulates NK cell development.

Main Methods:

  • Utilized a mouse model with NK cell-specific deletion of miR-15/16.
  • Analyzed the expression of the transcription factor c-Myb (Myb) in NK cells.
  • Performed Myb knockdown and overexpression experiments in wild-type and knockout NK cells.

Main Results:

  • Absence of miR-15/16 led to the accumulation of immature NK cells.
  • c-Myb (Myb) was identified as a direct target of miR-15/16 and was upregulated in miR-15/16 deficient NK cells.
  • Myb knockdown rescued NK cell maturation in the knockout model, while Myb overexpression in wild-type cells mimicked the immature phenotype.

Conclusions:

  • The miR-15/16 microRNA family plays a critical role in normal NK cell maturation.
  • Regulation of the transcription factor c-Myb (Myb) by miR-15/16 is a key mechanism controlling the NK cell maturation program.

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