qPCR was performed using a QuantiNova SYBR Green RT-PCR kit from Qiagen

qPCR was performed using a QuantiNova SYBR Green RT-PCR kit from Qiagen. miR130a inhibitor alone. miR130a inhibitor transfection significantly elevated the levels of ATG14 and phosphorylated (p-)Beclin 1, increased the LC3II/LC3I ratio, and decreased Netupitant the expression levels of P62 and cleaved caspase-3, while the co-transfection of miR130a inhibitor and siR-ATG14 attenuated these effects in H/R-induced primary cardiomyocytes. These results indicate that miR130a is involved in H/R-induced injuries in primary cardiomyocytes, and that Netupitant the inhibition of miR130a increases the levels of ATG14 and p-Beclin 1, thereby increasing autophagy and inhibiting apoptosis in these cells. Keywords: microRNA, miR130a, hypoxia/reoxygenation, autophagy-related gene 14, apoptosis, autophagy == Intro == Myocardial ischemia/reperfusion (I/R) injury is a common pathological process observed in the clinic. I/R injury may be regulated by various factors, including oxidative stress, Ca2+overload, myocardial energy metabolism disorder and cellular apoptosis (1). The occurrence of autophagy in myocardial cells during ischemia and hypoxia continues to be confirmed by numerousin vivoandin vitrostudies, which might either promote the survival of myocardial cells or induce cell death (2, 3). It has been shown that the knockout of autophagy-related gene 5 (ATG5) in cardiac tissues may lead to spontaneous CDH5 cardiac hypertrophy (2). MicroRNA (miR) is a class of non-coding RNA, which is 1822 nucleotides in length and participates in the regulation of cell proliferation, apoptosis and differentiation (4). In recent years, the effects Netupitant of miR on the pathogenesis of heart diseases have attracted increasing attention. miR130a has been shown to be expressed in the embryonic cardiac tissue, participating in the heart development process, and it has been suggested that upregulated miR130a Netupitant expression in embryonic cardiomyocytes might cause the ventricular muscle to be thinner and lead to abnormal heart structure (5). Moreover, miR130a overexpression continues to be demonstrated to reduce the expression level of connexin 43, a major cardiac gap junction protein in mice, resulting in atrial and ventricular arrhythmias (6). In addition , it has been shown that the expression level of Netupitant miR130a is downregulated in various I/R models (7, 8). However , the exact role of miR130a in the pathogenesis of I/R injury, particularly its relationship with autophagy, has not yet been fully elucidated. In the present study, hypoxia/reoxygenation (H/R)-treated primary rat myocardial cells were used as anin vitromodel for myocardial I/R injury, and the role of miR130a in the pathogenesis of H/R in myocardial cells, as well as the underlying mechanisms, were investigated. == Materials and methods == == == == Primary cell culture and identification == A total of 10 male Sprague-Dawley rats (age, 13 days) were provided by Shanghai Laboratory Pet Center (Shanghai, China). These rats were housed at 25C, under 50% humidity, feeding on normal diet. The animal experimental procedures were approved by the Ethics Committee of the Laiwu City People’s Hospital (Laiwu, China). Following disinfection with 75% ethanol, the rats were sacrificed by cervical dislocation, and the ventricular muscle was removed. The tissue was cut into 1-mm3pieces, and digested with 0. 25% trypsin in PBS buffer at 37C 1218 times (5 min each time). The supernatant was collected, and Dulbecco’s modified Eagle’s medium (Gibco; Thermo Scientific, Inc., Waltham, MA, USA) that contains 15% FBS (Gibco; Thermo Scientific, Inc. ) was added to stop the digestion. The cells were harvested using centrifugation at 800 gat room temperature intended for 10 min, and re-suspended in fresh culture medium. The cardiomyocytes were purified using the differential adhesion separation method (9), and 100 mol/l bromodeoxyuridine was used to inhibit the proliferation of other cells. After 72-h culture, these cardiomyocytes were used in the following experiments. == Cell transfection == The miR130a mimics, miR130a inhibitor, unfavorable control (NC) andriboFECT CP transfection reagent were purchased from Guangzhou RiboBio Co., Ltd. (Guangzhou, China). The small interfering RNA (siRNA) and NC sequence for ATG14 were purchased from Shanghai GenePharma Co., Ltd. (Shanghai, China)..