Abstract:
:Previous studies have extensively demonstrated the effect of endothelin-1 (ET-1), angiotensin II (Ang II), and TGF-β1 on the stimulation of collagen type I expression in cardiac myofibroblasts. However, the role of pro-remodeling peptides in the transcriptional regulation of the collagen promoter remains unclear. Thus, the purpose of this study was to investigate the net regulatory effects of pro-remodeling peptides on collagen type I promoter activity. Constructs of various lengths (300 bp, 1.1 kbp, 1.7 kbp, 2.3 kbp and 3.5 kbp) of the rat collagen α1(I) promoter were transfected into cardiac myofibroblasts in vitro and promoter activity was measured using chloramphenicol acetyl transferase (CAT) assays. Reduced promoter activity occurred across all treatments in myofibroblasts transfected with the 1.7 kbp construct. ET-1 was unable to increase promoter activity with constructs 300, 1.1, and 1.7 kbp, but induced promoter activity in cells with the 2.3 kbp construct. Additionally, while a combination of pro-remodeling peptides induced promoter activity across constructs, the resultant increase in the 2.3 and 3.5 kbp constructs were comparable to that observed from ET-1 treatment alone. Lastly, cells transfected with the entire promoter sequence had the lowest promoter activity. This data suggests that the collagen promoter is tightly regulated and that pro-remodeling factors produce an overall net effect on collagen expression, rather than additive.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Kisling A,Katwa LCdoi
10.1016/j.bbrc.2019.06.025subject
Has Abstractpub_date
2019-08-06 00:00:00pages
693-698issue
4eissn
0006-291Xissn
1090-2104pii
S0006-291X(19)31142-8journal_volume
515pub_type
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