Abstract:
:Direct cardiac reprogramming holds great potential for regenerative medicine. However, it remains inefficient, and induced cardiomyocytes (iCMs) generated in vitro are less mature than those in vivo, suggesting that undefined extrinsic factors may regulate cardiac reprogramming. Previous in vitro studies mainly used hard polystyrene dishes, yet the effect of substrate rigidity on cardiac reprogramming remains unclear. Thus, we developed a Matrigel-based hydrogel culture system to determine the roles of matrix stiffness and mechanotransduction in cardiac reprogramming. We found that soft matrix comparable with native myocardium promoted the efficiency and quality of cardiac reprogramming. Mechanistically, soft matrix enhanced cardiac reprogramming via inhibition of integrin, Rho/ROCK, actomyosin, and YAP/TAZ signaling and suppression of fibroblast programs, which were activated on rigid substrates. Soft substrate further enhanced cardiac reprogramming with Sendai virus vectors via YAP/TAZ suppression, increasing the reprogramming efficiency up to ∼15%. Thus, mechanotransduction could provide new targets for improving cardiac reprogramming.
journal_name
Stem Cell Reportsjournal_title
Stem cell reportsauthors
Kurotsu S,Sadahiro T,Fujita R,Tani H,Yamakawa H,Tamura F,Isomi M,Kojima H,Yamada Y,Abe Y,Murakata Y,Akiyama T,Muraoka N,Harada I,Suzuki T,Fukuda K,Ieda Mdoi
10.1016/j.stemcr.2020.07.022subject
Has Abstractpub_date
2020-09-08 00:00:00pages
612-628issue
3issn
2213-6711pii
S2213-6711(20)30299-Xjournal_volume
15pub_type
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