Polydatin markedly attenuated the increase of ANF and -MHC mRNA expression induced by Ang II (Figure 1dande). activity and superoxide production. These observations may shed new light on the understanding of the cardioprotective effect of polydatin. Keywords: Polydatin, cardiac hypertrophy, angiotensin II, Degarelix acetate reactive oxygen species, NADPH oxidase == Introduction == Cardiac hypertrophy is an adaptive remodeling response to increased cardiac wall stress caused by pressure and/or volume overload as well as neurohormonal activation. It is recognized as a risk factor for the development of heart failure and a very strong predictor of cardiovascular mortality. 1, 2Angiotensin II (Ang II) plays an important role in the pathogenesis and progression of cardiac hypertrophy and heart failure. 3, 4Numerous studies have shown that continuous infusion of Ang II contributes to alterations in cardiac functions and increases in cardiac mass, which is independent of its pressor action. 5, 6Additionally, inhibition of Ang II by angiotensin converting enzyme inhibitors or angiotensin type 1 receptor antagonists prevents or reverses cardiac hypertrophy after pressure overload. 6, 7Molecular mechanisms by which Ang II evokes cardiac hypertrophy are related to activation of protein kinase cascades, initiation of a fetal-like gene program, impairment of calcium handling, and increased production of reactive oxygen species (ROS). 8ROS have emerged as important triggers of the hypertrophic responses, bothin vitroandin festn, in response to stretch or other hypertrophy stimuli, such as Ang II. 911Several studies have shown that Ang II treatment increases ROS generation in cardiomyocytes and that inhibition of ROS generation by antioxidants abolishes Ang II-induced cardiomyocytes enlargement. 12, 13Therefore, developing new compounds and strategies to manipulate Ang II-mediated effects and reduce myocardial superoxide are highly valued for treatment of cardiac remolding. Polydatin, a resveratrol glucoside with a a few, 4′, 5-trihydroxystilbene-3 –D-glucopyranoside molecular structure, is a natural component extracted from the perennial herbPolygonum cuspidatumSieb. et Zucc. This plant has been used clinically in the treatment of cardiovascular disorders and ischemia/reperfusion injury in traditional Chinese medicine. 14, 15Polydatin is one of the major stilbenoid glucosides in grape juice and red wine. 16Similar to its analog resveratrol, polydatin has multiple pharmacological effects, including anti-inflammatory, neuroprotective, lipid-lowering actions, and especially strong antioxidative effects. 1719Recently, it was suggested that polydatin has strong protective effects against cardiac ischemiareperfusion injury and pressure-overload-induced ventricular remodeling. 2023There are also studies showing that polydatin ameliorates burn-generated cardiac dysfunction by reducing oxidative modification of ryanodine receptors. 24Despite these cardioprotective and antioxidant activities, the extent and Degarelix acetate mechanism to which polydatin improves cardiac remodeling remains poorly understood. Therefore , the present study was performed to determine whether polydatin attenuates Ang II-induced cardiac hypertrophyin vitroandin vivoby regulating NADPH oxidase activity and ROS production. == Materials and methods == Mouse monoclonal to ETV4 == Cell culture == All animal procedures were approved by the Animal Research Committee at Shaanxi University of Chinese Medicine, and conformed to the National Institutes of Health Guide for the Care and Use of Laboratory Animals. Primary cardiomyocyte cultures were prepared from 1-day-old SpragueDawley rats as described previously. 25Briefly, the ventricles of neonatal rats were enzymatically dissociated and the resulting cell suspension was enriched. Cells were suspended in Dulbecco’s Modified Eagle’s Medium (DMEM), supplemented with 10% fetal bovine serum (FBS) and penicillin/streptomycin. After pre-plating twice (45 min at 37) to minimize fibroblast, the cells were plated at 2 . 03. 0 104cells mL1onto poly-D-lysine-coated coverslips (Sigma, St Louis, MO), well plates, or dishes. The culture medium was replaced after 48 h with serum-free DMEM consisting of bromodeoxyuridine (0. 1 mmol/L), transferrin (5 g/mL), and insulin (1 g/mL), and cells were then incubated at 37 for Degarelix acetate 48 h prior to Degarelix acetate treatment. Following removal of cardiomyocyte-enriched culture medium at the end of the two pre-plating actions, the remaining attached cells (cardiac fibroblasts, assessed by microscopic.
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