Overexpression of long non-coding RNA cytoskeleton regulator RNA in patients with acute myocardial infarction with arrhythmia.

Background: Complications of arrhythmia often occur in patients with acute myocardial infarction (AMI). This study mainly explored the expression and diagnostic significance of long non-coding RNA CYTOR (lncRNA CYTOR) in patients with AMI with arrhythmia, and analyzed the effects of CYTOR on inflammation and oxidative stress responses of cardiomyocytes.

Methods: CYTOR expression in serum samples from 119 cases of AMI with arrhythmia and 119 healthy subjects was determined by qRT-PCR. Receiver operating characteristic (ROC) curve was drawn to evaluate the diagnostic function of serum CYTOR in AMI with arrhythmia. AMI cell models were constructed by hypoxia/reoxygenation treatment. The pathological function of CYTOR in AMI was determined by the detection of inflammatory factors and oxidative stress indicators.

Results: Serum CYTOR was upregulated in patients with AMI with arrhythmia, which has a certain ability to distinguish patients from healthy individuals (P<0.001, AUC=0.8963). The levels of interleukin-1beta (IL-1β), interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), and malondialdehyde (MDA) were increased in the AMI cell model, while superoxide dismutase (SOD) levels were decreased (P<0.001), which was alleviated by silencing CYTOR.

Conclusions: Overexpression of CYTOR may aggravate the condition of AMI patients with arrhythmia, which promotes oxidative stress injury and inflammatory response of cardiomyocytes. CYTOR can be a reference factor for diagnostic biomarkers of AMI with arrhythmia.