Abstract：
:The protective effects of downregulated miR-199a-5p on ischemic and hypoxic cardiomyocytes were well recognized, but the underlying mechanism of inhibited miR-199a-5p is not yet clear. The present study explored the relationship between enhanced signal transducer and activator of transcription 3 (STAT3) signaling and lowered production of miR-199a-5p in hypoxic cardiomyocytes. This study firstly found the correlation between elevated interleukin (IL)-6 and IL-11, as well as subsequent STAT3 signaling activation and the downregulation of miR-199a-5p in hypoxic myocardial samples from children with congenital heart disease. Then, using model of hypoxic mice and the intervention of phosphorylated STAT3 (pSTAT3), it was observed that pSTAT3 affected the expression of miR-199a-5p and modulated the expression of its target genes, including endoplasmic reticulum stress (ERS)-related activating transcription factor 6 (ATF6) and 78 kDa glucose-regulated protein (GRP78). Further observation revealed that the pSTAT3 signal in cardiac tissue could affect the expression of pri-miR-199a-2, a precursor of miR-199a-5p. And the chromatin immunoprecipitation (ChIP) assay also confirmed that pSTAT3 could bind to the promoter region of miR-199a-2 gene, which is more significant under hypoxic conditions. In conclusion, the activation of STAT3 signaling in cardiomyocytes during chronic hypoxia leads to downregulation of miR-199a-5p, which promotes the expression of many downstream target genes. This is an important pathway in the adaptive protection mechanism of myocardium during hypoxia.
journal_name
J Physiol Biochemjournal_title
Journal of physiology and biochemistryauthors
Zhou Y,Pang B,Xiao Y,Zhou S,He B,Zhang F,Liu W,Peng H,Li Pdoi
10.1007/s13105-018-0657-6subject
Has Abstractpub_date
2019-02-01 00:00:00pages
73-81issue
1eissn
1138-7548issn
1877-8755pii
10.1007/s13105-018-0657-6journal_volume
75pub_type
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