Limitations of the Current Study
Despite the abundant data in the current study and support from previous work, certain limitations need to be considered. First, a previous study by one of the coauthors concludes that miR-212/132 are cardiotoxic, not cardioprotective.4 Ucar et al4 show that miR-212/132 repress Forkhead box O3 transcription factor (FoxO3) and are thereby sufficient and necessary for hypertrophy and reduce autophagy. MiR-212/132 overexpression causes HF, and systemic miR knockout or miR-132 antagomir protects from HF after TAC.4 The current study does not address these contradictory findings about the effects of miR-212/132, other than to observe that isoproterenol/phenylephrine in vivo do not change FoxO3.1Speculatively, the discordance might be accounted for by cardioprotective effects of systemic miR antagomir or knockout via actions in immune or inflammatory cells,15whereas the current study is focused on miR-212/132 in myocytes only.
Limitations of the Current StudyDespite the abundant data in the current study and support from previous work, certain limitations need to be considered. First, a previous study by one of the coauthors concludes that miR-212/132 are cardiotoxic, not cardioprotective.4 Ucar et al4 show that miR-212/132 repress Forkhead box O3 transcription factor (FoxO3) and are thereby sufficient and necessary for hypertrophy and reduce autophagy. MiR-212/132 overexpression causes HF, and systemic miR knockout or miR-132 antagomir protects from HF after TAC.4 The current study does not address these contradictory findings about the effects of miR-212/132, other than to observe that isoproterenol/phenylephrine in vivo do not change FoxO3.1Speculatively, the discordance might be accounted for by cardioprotective effects of systemic miR antagomir or knockout via actions in immune or inflammatory cells,15whereas the current study is focused on miR-212/132 in myocytes only.
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