Dr. Hsieh, Patrick Ching-Ho 's publons link picture

Dr. Hsieh, Patrick Ching-Ho

Distinguished Research Fellow
Division Chief
  • 02-27899170 (Lab) (Room No: N417)
  • 02-27858594 (Fax)

  • Stem cells and regenerative medicine
  • Nanoscience and nanomedicine
  • Translational Research

Education and Positions:
  • M.D. Kaohsiung Medical College
    Ph.D. University of Washington, Seattle (Bioengineering)

  • Personal CV

  • Highlight Detail

    MicroRNA let-7-TGFBR3 signalling regulates cardiomyocyte apoptosis after infarction

    Dr. Hsieh, Patrick Ching-Ho
    EBioMedicine, Aug 07, 2019


    Myocardial infarction (MI) is a life-threatening disease, often leading to heart failure. Defining therapeutic targets at an early time point is important to prevent heart failure.


    MicroRNA screening was performed at early time points after MI using paired samples isolated from the infarcted and remote myocardium of pigs. We also examined the microRNA expression in plasma of MI patients and pigs. For mechanistic studies, AAV9-mediated microRNA knockdown and overexpression were administrated in mice undergoing MI.


    MicroRNAs let-7a and let-7f were significantly downregulated in the infarct area within 24 h post-MI in pigs. We also observed a reduction of let-7a and let-7f in plasma of MI patients and pigs. Inhibition of let-7 exacerbated cardiomyocyte apoptosis, induced a cardiac hypertrophic phenotype, and resulted in worsened left ventricular ejection fraction. In contrast, ectopic let-7 overexpression significantly reduced those phenotypes and improved heart function. We then identified TGFBR3 as a target of let-7, and found that induction of Tgfbr3 in cardiomyocytes caused apoptosis, likely through p38 MAPK activation. Finally, we showed that the plasma TGFBR3 level was elevated after MI in plasma of MI patients and pigs.


    Together, we conclude that the let-7-Tgfbr3-p38 MAPK signalling plays an important role in cardiomyocyte apoptosis after MI. Furthermore, microRNA let-7 and Tgfbr3 may serve as therapeutic targets and biomarkers for myocardial damage.


    Ministry of Science and Technology, National Health Research Institutes, Academia Sinica Program for Translational Innovation of Biopharmaceutical Development-Technology Supporting Platform Axis, Thematic Research Program and the Summit Research Program, Taiwan.