Journal
JOURNAL OF MOLECULAR AND CELLULAR CARDIOLOGY
Volume 134, Issue -, Pages 74-85Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.yjmcc.2019.06.018
Keywords
Sick sinus syndrome; microRNA-1976; Ion channels; Sinoatrial node aging
Categories
Funding
- National Natural Science Foundation of China [81360039, 81260038]
- Project of Yunnan Arrhythmia Research center [2017NS252, 2017NS253, 2018NS0267, 2018NS0268]
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Sick sinus syndrome (SSS) is primarily a disease of the elderly, and age-dependent decrease in Ca(v)1.2 and Ca(v)1.3 Ca2+ channels within the sinus node has been shown to play an important role in sinoatrial node (SAN) degeneration; however, posttranscriptional mechanisms regulating decrease in Ca(v)1.2 and Ca(v)1.3 Ca2+ channels remain unclear. Some studies have reported that microRNAs (miRNAs) are involved in age-related cardiovascular diseases. Nevertheless, little is known about the roles of miRNAs in age-related SSS. This study investigated whether miR-1976 was involved in the regulation of SAN degeneration by targeting Ca(v)1.2 and Ca(v)1.3 Ca2+ channels. First, using microarray-based miRNA expression profiling and qRT-PCR, we confirmed that miR-1976 was upregulated in the plasma of patients with age-related SSS relative to healthy controls. By employing target gene prediction software, luciferase assay and western blotting, we further confirmed Ca(v)1.2 and Ca(v)1.3 as direct targets of miR-1976. Furthermore, miR-1976 levels in rabbit SAN tissues were negatively correlated with Ca(v)1.2 and Ca(v)1.3 expression and intrinsic heart rates but positively correlated with corrected sinus node recovery time (CSNRT). Additionally, miR-1976 transgenic mice displayed attenuated Ca(v)1.2 and Ca(v)1.3 protein expression, which led to sinus node dysfunction. These results suggest that miR-1976 plays an important role in the SAN aging process by targeting Ca(v)1.2 and Ca(v)1.3. Thus, miR-1976 could have great potential as a non-invasive diagnostic tool and therapeutic target for SSS. These findings may reveal important insights into the pathogenesis of SSS.
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