PEDF improves cardiac function in rats subjected to myocardial ischemia/reperfusion injury by inhibiting ROS generation via PEDF‑R

Abstract

The prevention and management of myocardial ischemia/reperfusion (MI/R) injury is an essential part of coronary heart disease surgery and is becoming a major clinical problem in the treatment of ischemic heart disease. Previous studies by our group have demonstrated that pigment epithelium-derived factor (PEDF) improves cardiac function in rats with acute myocardial infarction and reduces hypoxia-induced cell injury. However, the protective function and mechanisms underlying the effect of PEDF in MI/R injury remain to be fully understood. In the present study, the positive effect of PEDF in MI/R injury was confirmed by construction of the adult Sprague-Dawley rat MI/R model. PEDF reduced myocardial infarct size and downregulated cardiomyocyte apoptosis in the I/R myocardium in this model. In addition, PEDF improved cardiac function and increased cardiac functional reserve in rats subjected to MI/R Injury. To further study the protective effect of PEDF and the underlying mechanisms in MI/R injury, a H9c2 cardiomyocyte hypoxia/reoxygenation (H/R) model was constructed. PEDF was confirmed to decrease H/R-induced apoptosis in H9c2 cells, and this anti-apoptotic function was abolished by pigment epithelium-derived factor-receptor (PEDF R) small interfering (si)RNA. Furthermore, administration of PEDF decreased the levels of reactive oxygen species (ROS) and malondialdehyde (MDA) in H/R H9c2 cells. Compared with the H/R group, PEDF decreased mitochondrial ROS, increased the mitochondrial DNA copy number, reduced xanthine oxidase and NADPH oxidase activity, as well as RAC family small GTPase 1 protein expression. However, these effects of PEDF were markedly attenuated by PEDF-R siRNA. To the best of our knowledge, the present study is the first to identify the protective effect of PEDF in MI/R injury, and confirm that the antioxidative effect PEDF occurred via inhibition of ROS generation via PEDF-R under MI/R conditions.

Epigallocatechin-3-Gallate and PEDF 335 Peptide, 67LR Activators, Attenuate Vasogenic Edema, and Astroglial Degeneration Following Status Epilepticus

“…Indeed, EGCG inhibits the activities of NADPH oxidase [ 83 ] and ERK1/2 via 67LR [ 75 , 84 ]. PEDF also abrogates ERK1/2 and NADPH oxidase activities [ 85 , 86 , 87 ]. Thus, our findings suggest that EGCG and NU335 may lead to astroglial AQP4 upregulation by 67LR-medaited NADPH oxidase inhibition, which would decrease ERK1/2-AKT activities.…”

Pigment Epithelium-Derived Factor Promotes the Growth and Migration of Human Esophageal Squamous Cell Carcinoma

“…PEDF is associated with signaling pathways related to cancer development. PEDF can directly bind to PEDF receptor (PEDFR) and stimulate the activity of phospholipase (26). PEDFR is strongly linked to cell proliferation in cancers (27).…”

Effect and mechanism of asiatic acid on autophagy in myocardial ischemia‑reperfusion injury <em>in&nbsp;vivo</em> and <em>in&nbsp;vitro</em>

“…However, myocardial ischemia-reperfusion (I/R) injury (MIRI) may result in additional cardiomyocyte dysfunction, which further aggravates myocardial cell damage (3), and constitutes a significant part of the pathology, contributing to heart failure in patients with CHD (4). The mechanisms underlying MIRI are complex and are associated with a variety of pathologies, such as oxidative stress, calcium overload, inflammatory response and energy metabolism disorders (4)(5)(6). Among these contributors, a number of studies have demonstrated that oxidative stress induced by a rapid increase in the levels of reactive oxygen species (ROS), which can be observed during reperfusion, is a key initiator of MIRI (6,7).…”

“…The mechanisms underlying MIRI are complex and are associated with a variety of pathologies, such as oxidative stress, calcium overload, inflammatory response and energy metabolism disorders ( 4-6 ). Among these contributors, a number of studies have demonstrated that oxidative stress induced by a rapid increase in the levels of reactive oxygen species (ROS), which can be observed during reperfusion, is a key initiator of MIRI ( 6 , 7 ).…”