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Tanshinone IIA Improves miR-133 Expression Through MAPK ERK1/2 Pathway in Hypoxic Cardiac Myocytes.
MedLine Citation:
PMID:  22890296     Owner:  NLM     Status:  Publisher    
Tanshinone IIA is a lipid-soluble pharmacologically active compound extracted from the rhizome of Chinese herb Salvia miltiorrhiza, a well-known traditional Chinese medicine used for the treatment of cardiovascular disorders. Previous studies have identified that tanshinone IIA inhibited overexpression of miR-1 in hypoxic neonatal cardiomyocytes. This study was designed to examine the effects of tanshinone IIA on miR-133 expression under hypoxic condition. Neonatal rat cardiomyocytes were cultured in a hypoxic environment (2% O(2)+93% N(2)+5% CO(2)) at 37°C for 24 hours. MTT, TUNEL assays, and Flow Cytometry (FCM) were performed to identify cell apoptosis. Western blot was used to examine the expression of ERK1/2 and miR-133 level was quantified by Real-time PCR. Our results showed that apoptosis was induced by hypoxia. Typical apoptotic cells were seen by TUNEL assay, and FCM showed an apoptosis rate of 13.32% in hypoxic group. Apoptosis rate in hypoxic cells was reduced significantly by tanshinone IIA. In addition, the expression level of miR-133 was increased in hypoxic cells and further upregulated by tanshinone IIA. The stress-activated protein kinase MAPK ERK1/2 was activated by hypoxia and further increased with tanshinone IIA treatment. The present study demonstrated that tanshinone IIA enhanced cell resistance to hypoxic insult by upregulating miR-133 expression through activating MAPK ERK1/2 in neonatal cardiomyocytes.
Li Zhang; Yanli Wu; Yumei Li; Chaoqian Xu; Xuelian Li; Daling Zhu; Yan Zhang; Shu Xing; Haoyan Wang; Zhihua Zhang; Hongli Shan
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-10
Journal Detail:
Title:  Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology     Volume:  30     ISSN:  1421-9778     ISO Abbreviation:  Cell. Physiol. Biochem.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9113221     Medline TA:  Cell Physiol Biochem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  843-852     Citation Subset:  -    
Copyright Information:
Copyright © 2012 S. Karger AG, Basel.
Department of Pharmacology (State-Province Key Laboratories of Biomedicine- Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Daqing, Heilongjiang, P. R. China.
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