mir-17-92 cluster is required for and sufficient to induce cardiomyocyte proliferation in postnatal and adult hearts

Circ Res. 2013 Jun 7;112(12):1557-66. doi: 10.1161/CIRCRESAHA.112.300658. Epub 2013 Apr 10.


Rationale: Cardiomyocytes in adult mammalian hearts are terminally differentiated cells that have exited from the cell cycle and lost most of their proliferative capacity. Death of mature cardiomyocytes in pathological cardiac conditions and the lack of regeneration capacity of adult hearts are primary causes of heart failure and mortality. However, how cardiomyocyte proliferation in postnatal and adult hearts becomes suppressed remains largely unknown. The miR-17-92 cluster was initially identified as a human oncogene that promotes cell proliferation. However, its role in the heart remains unknown.

Objective: To test the hypothesis that miR-17-92 participates in the regulation of cardiomyocyte proliferation in postnatal and adult hearts.

Methods and results: We deleted miR-17-92 cluster from embryonic and postnatal mouse hearts and demonstrated that miR-17-92 is required for cardiomyocyte proliferation in the heart. Transgenic overexpression of miR-17-92 in cardiomyocytes is sufficient to induce cardiomyocyte proliferation in embryonic, postnatal, and adult hearts. Moreover, overexpression of miR-17-92 in adult cardiomyocytes protects the heart from myocardial infarction-induced injury. Similarly, we found that members of miR-17-92 cluster, miR-19 in particular, are required for and sufficient to induce cardiomyocyte proliferation in vitro. We identified phosphatase and tensin homolog, a tumor suppressor, as an miR-17-92 target to mediate the function of miR-17-92 in cardiomyocyte proliferation.

Conclusions: Our studies therefore identify miR-17-92 as a critical regulator of cardiomyocyte proliferation, and suggest this cluster of microRNAs could become therapeutic targets for cardiac repair and heart regeneration.

Keywords: PTEN; cardiomyocyte proliferation; cell cycle; heart disease; miR-17–92; myocardial infarction.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Age Factors
  • Animals
  • Animals, Newborn
  • Cell Proliferation*
  • Cells, Cultured
  • Disease Models, Animal
  • Gene Expression Regulation, Developmental
  • Heart / embryology*
  • Homeobox Protein Nkx-2.5
  • Homeodomain Proteins / genetics
  • Homeodomain Proteins / metabolism
  • Mice
  • Mice, Knockout
  • Mice, Transgenic
  • MicroRNAs / genetics
  • MicroRNAs / metabolism*
  • Myocardial Infarction / diagnostic imaging
  • Myocardial Infarction / genetics
  • Myocardial Infarction / metabolism*
  • Myocardial Infarction / prevention & control
  • Myocytes, Cardiac / metabolism*
  • Myocytes, Cardiac / pathology
  • PTEN Phosphohydrolase / genetics
  • PTEN Phosphohydrolase / metabolism
  • RNA Interference
  • Rats
  • Transcription Factors / genetics
  • Transcription Factors / metabolism
  • Transfection
  • Ultrasonography


  • Homeobox Protein Nkx-2.5
  • Homeodomain Proteins
  • MIRN17-92 microRNA, mouse
  • MicroRNAs
  • Nkx2-5 protein, mouse
  • Transcription Factors
  • PTEN Phosphohydrolase
  • Pten protein, mouse