Abstract:
:Follistatin-like 1 (Fstl1) is a secreted protein that is acutely induced in heart following myocardial infarction (MI). In this study, we investigated cell type-specific regulation of Fstl1 and its function in a murine model of MI Fstl1 was robustly expressed in fibroblasts and myofibroblasts in the infarcted area compared to cardiac myocytes. The conditional ablation of Fstl1 in S100a4-expressing fibroblast lineage cells (Fstl1-cfKO mice) led to a reduction in injury-induced Fstl1 expression and increased mortality due to cardiac rupture during the acute phase. Cardiac rupture was associated with a diminished number of myofibroblasts and decreased expression of extracellular matrix proteins. The infarcts of Fstl1-cfKO mice displayed weaker birefringence, indicative of thin and loosely packed collagen. Mechanistically, the migratory and proliferative capabilities of cardiac fibroblasts were attenuated by endogenous Fstl1 ablation. The activation of cardiac fibroblasts by Fstl1 was mediated by ERK1/2 but not Smad2/3 signaling. This study reveals that Fstl1 is essential for the acute repair of the infarcted myocardium and that stimulation of early fibroblast activation is a novel function of Fstl1.
journal_name
EMBO Mol Medjournal_title
EMBO molecular medicineauthors
Maruyama S,Nakamura K,Papanicolaou KN,Sano S,Shimizu I,Asaumi Y,van den Hoff MJ,Ouchi N,Recchia FA,Walsh Kdoi
10.15252/emmm.201506151subject
Has Abstractpub_date
2016-08-01 00:00:00pages
949-66issue
8eissn
1757-4676issn
1757-4684pii
emmm.201506151journal_volume
8pub_type
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