Abstract:
:BACKGROUND Previous studies demonstrated that puerarin has therapeutic effects on cardiac hypertrophy. This study aimed to explore whether the effect of puerarin on attenuating cardiac hypertrophy is related to regulation of microRNAs (miRNAs) and the transforming growth factor beta (TGFβ) signal pathway. MATERIAL AND METHODS The therapeutic effect of puerarin was assessed using an angiotensin (Ang) II-induced heart hypertrophy model in mice. The primary cardiomyocytes were used as an in vitro model. MiR-15 family expression was quantified using qRT-PCR analysis. The expression of the genes involved in canonical and non-canonical TGFβ signal pathways was measured using qRT-PCR and Western blot analysis. In vitro cardiac hypertrophic features were assessed by quantifying cardiac hypertrophic genes and measurement of cell surface, protein synthesis, and total protein content. RESULTS Puerarin attenuated cardiac hypertrophy and increased miR-15b and miR-195 expression in the mouse cardiac hypertrophy model and in primary cardiomyocytes. It suppressed both canonical and non-canonical TGFβ signal pathways, partially through miR-15b and miR-195. Puerarin reduced mRNA expression of cardiac hypertrophic genes, reduced cell surface area, and lowered the rate of protein synthesis and the total protein content induced by Ang II. Knockdown of endogenous miR-15b and miR-195 partly abrogated these effects. Knockdown of endogenous p38, but not Smad2/3/4, presented similar effects as miR-15b. CONCLUSIONS Puerarin administration enhances miR-15b and miR-195 expression in an Ang II-induced cardiac hypertrophy model, through which it suppresses both canonical and non-canonical TGFβ signal pathways at the same time. However, the effect of puerarin on attenuating cardiac hypertrophy is mainly through the non-canonical TGFβ pathway.
journal_name
Med Sci Monitjournal_title
Medical science monitor : international medical journal of experimental and clinical researchauthors
Zhang X,Liu Y,Han Qdoi
10.12659/msm.895877subject
Has Abstractpub_date
2016-05-05 00:00:00pages
1516-23eissn
1234-1010issn
1643-3750pii
895877journal_volume
22pub_type
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journal_title:Medical science monitor : international medical journal of experimental and clinical research
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