[HTML][HTML] A circular RNA binds to and activates AKT phosphorylation and nuclear localization reducing apoptosis and enhancing cardiac repair

Y Zeng, WW Du, Y Wu, Z Yang, FM Awan, X Li… - Theranostics, 2017 - ncbi.nlm.nih.gov
Y Zeng, WW Du, Y Wu, Z Yang, FM Awan, X Li, W Yang, C Zhang, Q Yang, A Yee, Y Chen
Theranostics, 2017ncbi.nlm.nih.gov
As central nodes in cardiomyocyte signaling, nuclear AKT appears to play a cardio-
protective role in cardiovascular disease. Here we describe a circular RNA, circ-Amotl1 that
is highly expressed in neonatal human cardiac tissue, and potentiates AKT-enhanced
cardiomyocyte survival. We hypothesize that circ-Amotl1 binds to PDK1 and AKT1, leading
to AKT1 phosphorylation and nuclear translocation. In primary cardiomyocytes, epithelial
cells, and endothelial cells, we found that forced circ-Amotl1 expression increased the …
Abstract
As central nodes in cardiomyocyte signaling, nuclear AKT appears to play a cardio-protective role in cardiovascular disease. Here we describe a circular RNA, circ-Amotl1 that is highly expressed in neonatal human cardiac tissue, and potentiates AKT-enhanced cardiomyocyte survival. We hypothesize that circ-Amotl1 binds to PDK1 and AKT1, leading to AKT1 phosphorylation and nuclear translocation. In primary cardiomyocytes, epithelial cells, and endothelial cells, we found that forced circ-Amotl1 expression increased the nuclear fraction of pAKT. We further detected increased nuclear pAKT in circ-Amotl1-treated hearts. In vivo, circ-Amotl1 expression was also found to be protective against Doxorubicin (Dox)-induced cardiomyopathy. Putative PDK1-and AKT1-binding sites were then identified in silico. Blocking oligonucleotides could reverse the effects of exogenous circ-Amotl1. We conclude that circ-Amotl1 physically binds to both PDK1 and AKT1, facilitating the cardio-protective nuclear translocation of pAKT.
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