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MicroRNA-133 controls cardiac hypertrophy

Alessandra Carè1, Daniele Catalucci, Federica Felicetti

  • 1Department of Hematology, Oncology and Molecular Medicine, Istituto Superiore Sanità, 00161 Rome, Italy.

Nature Medicine
|May 1, 2007
PubMed

Insights

MicroRNAs (miRNAs) regulate heart cell growth. Reduced miR-133 levels promote cardiac hypertrophy, a heart condition, suggesting therapeutic potential for heart disease treatments.

Area of Science:

  • Molecular Biology
  • Cardiovascular Research
  • Gene Regulation

Background:

  • MicroRNAs (miRNAs) are crucial regulators of cellular functions, including oncogenesis.
  • Cardiac hypertrophy is a significant pathological condition affecting heart function.

Purpose of the Study:

  • To investigate the role of miR-133 in cardiomyocyte hypertrophy.
  • To identify the molecular targets of miR-133 involved in cardiac hypertrophy.

Main Methods:

  • Analysis of miR-133 and miR-1 expression in mouse and human cardiac hypertrophy models.
  • In vitro experiments involving overexpression and suppression of miR-133 and miR-1.
  • In vivo studies using antagomirs to inhibit miR-133.
  • Identification of miR-133 targets using molecular assays.

Main Results:

  • Decreased expression of miR-133 and miR-1 was observed in cardiac hypertrophy.
  • Overexpression of miR-133 or miR-1 inhibited hypertrophy, while suppression induced it.
  • Inhibition of miR-133 in vivo led to sustained cardiac hypertrophy.
  • Identified RhoA, Cdc42, and Nelf-A/WHSC2 as direct targets of miR-133.

Conclusions:

  • miR-133 is a critical regulator of cardiomyocyte hypertrophy.
  • miR-133 and potentially miR-1 play key roles in cardiac hypertrophy pathogenesis.
  • These findings suggest therapeutic strategies targeting miR-133 for heart disease.

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