Therapeutic silencing of miR-652 restores heart function and attenuates adverse remodeling in a setting of established pathological hypertrophy Academic Article uri icon

abstract

  • Expression of microRNA-652 (miR-652) increases in the diseased heart, decreases in a setting of cardioprotection, and is inversely correlated with heart function. The aim of this study was to assess the therapeutic potential of inhibiting miR-652 in a mouse model with established pathological hypertrophy and cardiac dysfunction due to pressure overload. Mice were subjected to a sham operation or transverse aortic constriction (TAC) for 4 wk to induce hypertrophy and cardiac dysfunction, followed by administration of a locked nucleic acid (LNA)-antimiR-652 (miR-652 inhibitor) or LNA control. Cardiac function was assessed before and 8 wk post-treatment. Expression of miR-652 increased in hearts subjected to TAC compared to sham surgery (2.9-fold), and this was suppressed by ∼95% in LNA-antimiR-652-treated TAC mice. Inhibition of miR-652 improved cardiac function in TAC mice (fractional shortening:29±1% at 4 wk post-TAC compared to 35±1% post-treatment) and attenuated cardiac hypertrophy. Improvement in heart function was associated with reduced cardiac fibrosis, less apoptosis and B-type natriuretic peptide gene expression, and preserved angiogenesis. Mechanistically, we identified Jagged1 (a Notch1 ligand) as a novel direct target of miR-652. In summary, these studies provide the first evidence that silencing of miR-652 protects the heart against pathological remodeling and improves heart function.

authors

  • Bernardo, BC
  • Nguyen, SS
  • Winbanks, CE
  • Gao, X-M
  • Boey, EJH
  • Tham, YK
  • Kiriazis, H
  • Ooi, JYY
  • Porrello, ER
  • Igoor, S
  • Thomas, CJ
  • Gregorevic, P
  • Lin, RCY
  • Du, X-J
  • McMullen, JR

publication date

  • 2014