MiR-181c-5p Promotes Inflammatory Response during Hypoxia/Reoxygenation Injury by Downregulating Protein Tyrosine Phosphatase Nonreceptor Type 4 in H9C2 Cardiomyocytes
Sheng Wang, Liang Ge, Dengwen Zhang, Lin Wang, Hao Liu, Xiaodong Ye, Wanling Liang, Jun Li, Haichun Ma, Yin Cai, Zhengyuan Xia
Abstract
Background . Constitutive nuclear factor kappa B (NF κ B) activation has been shown to exacerbate during myocardial ischemia/reperfusion (I/R) injury. We recently showed that miR-181c-5p exacerbated cardiomyocytes injury and apoptosis by directly targeting the 3<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:msup><mml:mrow/><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup></mml:math>-untranslated region of protein tyrosine phosphatase nonreceptor type 4 (PTPN4). However, whether miR-181c-5p mediates cardiac I/R injury through NF κ B-mediated inflammation is unknown. Thus, the present study aimed to investigate the role of miR-181c-5p during myocardial I/R injury and explore its mechanism in relation to inflammation in H9C2 cardiomyocytes. Methods and Results . In hypoxia/reoxygenation (H/R, 6 h hypoxia followed by 6 h reoxygenation)-stimulated H9C2 cardiomyocytes or postischemic myocardium of rat, the expression of miR-181c-5p was significantly upregulated, which was concomitant increased NF κ B activity when compared to the nonhypoxic or nonischemic control groups. This is indicative that miR-181c-5p may be involved in NF κ B-mediated inflammation during myocardial I/R injury. To investigate the potential role of miR-181c-5p in H/R-induced cell inflammation and injury, H9C2 cardiomyocytes were transfected with the miR-181c-5p agomir. Overexpression of miR-181c-5p significantly aggravated H/R-induced cell injury (increased lactate dehydrogenase (LDH) level) and exacerbated NF κ B-mediated inflammation (greater phosphorylation and degradation of I κ B α , phosphorylation of p65, and increased levels of proinflammatory cytokines tumor necrosis factor α (TNF α ), interleukin (IL)-6, and IL-1 β ). In contrast, inhibition of miR-181c-5p by its antagomir transfection in vitro had the opposite effect. Furthermore, overexpression of miR-181c-5p significantly enhanced lipopolysaccharide-induced NF κ B signalling. Additionally, knockdown of PTPN4, the direct target of miR-181c-5p, significantly aggravated H/R-induced phosphorylation and degradation of I κ B α , phosphorylation of p65, and the levels of proinflammatory cytokines. PTPN4 knockdown also cancelled miR-181c-5p antagomir mediated anti-inflammatory effects in H9C2 cardiomyocytes during H/R injury. Conclusions . It is concluded that miR-181c-5p may exacerbate myocardial I/R injury and NF κ B-mediated inflammation via PTPN4, and that targeting miR-181c-5p/PTPN4/NF κ B signalling may represent a novel strategy to combat myocardial I/R injury.