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Targeting native adult heart progenitors with cardiogenic small molecules.

Abstract：

:Targeting native progenitors with small molecule pharmaceuticals that direct cell fate decisions is an attractive approach for regenerative medicine. Here, we show that 3,5-disubstituted isoxazoles (Isx), stem cell-modulator small molecules originally recovered in a P19 embryonal carcinoma cell-based screen, directed cardiac muscle gene expression in vivo in target tissues of adult transgenic reporter mice. Isx also stimulated adult mouse myocardial cell cycle activity. Narrowing our focus onto one target cardiac-resident progenitor population, Isx directed muscle transcriptional programs in vivo in multipotent Notch-activated epicardium-derived cells (NECs), generating Notch-activated adult cardiomyocyte-like precursors. Myocardial infarction (MI) preemptively differentiated NECs toward fibroblast lineages, overriding Isx's cardiogenic influence in this cell population. Isx dysregulated gene expression in vivo in Notch-activated repair fibroblasts, driving distinctive (pro-angiogenesis) gene programs, but failed to mitigate fibrosis or avert ventricular functional decline after MI. In NECs in vitro, Isx directed partial muscle differentiation, which included biosynthesis and assembly of sarcomeric α-actinin premyofibrils, beaded structures pathognomonic of early developing cardiomyocytes. Thus, although Isx small molecules have promising in vivo efficacy at the level of cardiac muscle gene expression in native multipotent progenitors and are first in class in this regard, a greater understanding of the dynamic interplay between fibrosis and cardiogenic small molecule signals will be required to pharmacologically enable regenerative repair of the heart.

journal_name

ACS Chem Biol

journal_title

ACS chemical biology

authors

Russell JL,Goetsch SC,Aguilar HR,Frantz DE,Schneider JW

doi

10.1021/cb200525q

subject

Has Abstract

pub_date

2012-06-15 00:00:00

pages

1067-76

issue

6

eissn

1554-8929

issn

1554-8937

journal_volume

7

pub_type

杂志文章

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