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https://www.readbyqxmd.com/read/28421341/insufficient-activation-of-akt-upon-reperfusion-because-of-its-novel-modification-by-reduced-pp2a-b55%C3%AE-contributes-to-enlargement-of-infarct-size-by-chronic-kidney-disease
#1
Toshiyuki Tobisawa, Toshiyuki Yano, Masaya Tanno, Takayuki Miki, Atsushi Kuno, Yukishige Kimura, Satoko Ishikawa, Hidemichi Kouzu, Keitaro Nishizawa, Hideaki Yoshida, Tetsuji Miura
Chronic kidney disease (CKD) increases myocardial infarct size by an unknown mechanism. Here we examined the hypothesis that impairment of protective PI3K-PDK1-Akt and/or mTORC-Akt signaling upon reperfusion contributes to CKD-induced enlargement of infarct size. CKD was induced in rats by 5/6 nephrectomy (SNx group) 4 weeks before myocardial infarction experiments, and sham-operated rats served as controls (Sham group). Infarct size as a percentage of area at risk after ischemia/reperfusion was significantly larger in the SNx group than in the Sham group (56...
May 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28415467/poly-l-lactic-acid-and-polyurethane-nanofibers-fabricated-by-solution-blow-spinning-as-potential-substrates-for-cardiac-cell-culture
#2
Ewelina Tomecka, Michal Wojasinski, Elzbieta Jastrzebska, Michal Chudy, Tomasz Ciach, Zbigniew Brzozka
This paper presents a comparison and evaluation of cardiac cell proliferation on poly(l-lactic acid) (PLLA) and polyurethane (PU) nanofibrous mats fabricated by solution blow spinning (SBS). Three different cardiac cell lines: rat cardiomyoblasts (H9C2 line), human (HCM) and rat cardiomyocytes (RCM) were used for experiments. Cell morphology, orientation and proliferation were investigated on non-modified and protein-modified (fibronectin, collagen, gelatin, laminin, poly-l-lysine) surfaces of both types of nanofibers...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28407839/-effect-of-histone-acetylation-deacetylation-imbalances-on-key-gene-of-planar-cell-polarity-pathway
#3
Hong-Yu Duan, Yi Zhang, Kai-Yu Zhou, Chuan Wang, DA-Jian Qiu, Yi-Min Hua
OBJECTIVE: To investigate the effect of histone acetylation/deacetylation imbalances on embryonic hearts of mice and its effect on key genes of planar cell polarity (PCP) pathway-Vangl2, Scrib and Rac1 in H9C2 cells. METHODS: Forty pregnant C57/B6 mice were randomly assigned into three groups: blank group (n=10), vehicle group (n=10), and valproic acid (VPA)-treated group (n=20). In the VPA-treated group, VPA, a histone deacetylase (HDAC) inhibitor, was administered to each individual dam intraperitoneally at a single dose of 700 mg/kg on embryonic day 10...
April 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28404768/dj-1-overexpression-restores-ischaemic-post-conditioning-mediated-cardioprotection-in-diabetic-rats-%C3%AF-role-of-autophagy
#4
Bin Zhou, Shaoqing Lei, Rui Xue, Yan Leng, Zhengyuan Xia, Zhong-Yuan Xia
IPO (Ischaemic post-conditioning) is a promising method of alleviating myocardial IR (ischaemia -reperfusion) injury; however, IPO-mediated cardioprotection is lost in diabetic hearts via mechanisms that remain largely unclear. We hypothesized that decreased cardiac expression of DJ-1, a positive modulator of autophagy, compromises the effectiveness of IPO-induced cardioprotection in diabetic rats. Diabetic rats subjected to myocardial IR (30 min of coronary artery occlusion followed by 120 min of reperfusion) exhibited more severe myocardial injury, less cardiac autophagy, lower DJ-1 expression and AMPK (adenosine monophosphate-activated protein kinase)/mTOR (mammalian target of rapamycin) pathway activity than non-diabetic rats...
April 12, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28400318/hemopexin-counteracts-systolic-dysfunction-induced-by-heme-driven-oxidative-stress
#5
Giada Ingoglia, Can Martin Sag, Nikolai Rex, Lucia De Franceschi, Francesca Vinchi, James Cimino, Sara Petrillo, Stefan Wagner, Klaus Kreitmeier, Lorenzo Silengo, Fiorella Altruda, Lars S Maier, Emilio Hirsch, Alessandra Ghigo, Emanuela Tolosano
Heart failure is a leading cause of morbidity and mortality in patients affected by different disorders associated to intravascular hemolysis. The leading factor is the presence of pathologic amount of pro-oxidant free heme in the bloodstream, due to the exhaustion of the natural heme scavenger Hemopexin (Hx). Here, we evaluated whether free heme directly affects cardiac function, and tested the therapeutic potential of replenishing serum Hx for increasing serum heme buffering capacity. The effect of heme on cardiac function was assessed in vitro, on primary cardiomyocytes and H9c2 myoblast cell line, and in vivo, in Hx(-/-) mice and in genetic and acquired mouse models of intravascular hemolysis...
April 8, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28394420/tiron-ameliorates-high-glucose-induced-cardiac-myocyte-apoptosis-by-pkc%C3%AE-dependent-inhibition-of-osteopontin
#6
Ping Jiang, Deling Zhang, Hong Qiu, Xianqi Yi, Yemin Zhang, Yingkang Cao, Bo Zhao, Zhongyuan Xia, Changhua Wang
Tiron functions as an effective antioxidant alleviating the intracellular reactive oxygen species (ROS) or the acute toxic metal overload. The previous studies have shown that cardiac myocyte apoptosis can be effectively inhibited by tiron administration in streptozotocin (STZ)-induced diabetic rats, primary neonatal rat cardiomyocytes (NRVMs), and H9c2 embryonic rat cardiomyocytes. However, the underlying signaling mechanism is ill-defined. In the present study, we found that tiron supplementation significantly inhibited apoptosis of high glucose (HG)-treated NRVMs and the left ventricular cardiomyocytes from STZ-diabetic rat, accompanied with a reduction of osteopontin (OPN) levels as well as an inhibition of PKCδ phosphorylation...
April 10, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28394280/acute-pre-post-treatment-with-8th-day-sod-like-supreme-a-free-radical-scavenging-health-product-protects-against-oxidant-induced-injury-in-cultured-cardiomyocytes-and-hepatocytes-in-vitro-as-well-as-in-mouse-myocardium-and-liver-in-vivo
#7
Pou Kuan Leong, Jihang Chen, Wing Man Chan, Hoi Yan Leung, Lincoln Chan, Kam Ming Ko
8th Day superoxide dismutase (SOD)-Like Supreme (SOD-Like Supreme, a free radical scavenging health product) is an antioxidant-enriched fermentation preparation with free radical scavenging properties. In the present study, the cellular/tissue protective actions of SOD-Like Supreme against menadione toxicity in cultured H9c2 cardiomyocytes and in AML12 hepatocytes as well as oxidant-induced injury in the mouse myocardium and liver were investigated. SOD-Like Supreme was found to possess potent free radical scavenging activity in vitro as assessed by an oxygen radical absorbance capacity assay...
April 10, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28392886/amifostine-pretreatment-attenuates-myocardial-ischemia-reperfusion-injury-by-inhibiting-apoptosis-and-oxidative-stress
#8
Shao-Ze Wu, Lu-Yuan Tao, Jiao-Ni Wang, Zhi-Qiang Xu, Jie Wang, Yang-Jing Xue, Kai-Yu Huang, Jia-Feng Lin, Lei Li, Kang-Ting Ji
The present study was aimed at investigating the effect of amifostine on myocardial ischemia/reperfusion (I/R) injury of mice and H9c2 cells cultured with TBHP (tert-butyl hydroperoxide). The results showed that pretreatment with amifostine significantly attenuated cell apoptosis and death, accompanied by decreased reactive oxygen species (ROS) production and lower mitochondrial potential (ΔΨm). In vivo, amifostine pretreatment alleviated I/R injury and decreased myocardial apoptosis and infarct area, which was paralleled by increased superoxide dismutase (SOD) and reduced malondialdehyde (MDA) in myocardial tissues, increased Bcl2 expression, decreased Bax expression, lower cleaved caspase-3 level, fewer TUNEL positive cells, and fewer DHE-positive cells in heart...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28391263/salvianolic-acid-a-protects-h9c2-cells-from-arsenic-trioxide-induced-injury-via-inhibition-of-the-mapk-signaling-pathway
#9
Jing-Yi Zhang, Gui-Bo Sun, Yun Luo, Min Wang, Wei Wang, Yu-Yang Du, Ying-Li Yu, Xiao-Bo Sun
BACKGROUND/AIMS: This study aimed to investigate whether Salvianolic acid A (Sal A) conferred cardiac protection against Arsenic trioxide (ATO)-induced cardiotoxicity in H9c2 cells by inhibiting MAPK pathways activation. METHODS: H9c2 cardiac cells were exposed to 10 µM ATO for 24 h to induce cytotoxicity. The cells were pretreated with Sal A for 4 h before exposure to ATO. Cell viability was determined utilizing the MTT assay. The percentage of apoptosis was measured by a FITC-Annexin V/PI apoptosis kit for flow cytometry...
April 7, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28386372/thioredoxin-2-protects-against-oxygen-glucose-deprivation-reperfusion-injury-by-inhibiting-autophagy-and-apoptosis-in-h9c2-cardiomyocytes
#10
Yan-Yan Li, Yin Xiang, Song Zhang, Yan Wang, Jie Yang, Wei Liu, Feng-Tai Xue
The aim of this study is to examine the role of thioredoxin-2 (Trx2) in autophagy and apoptosis during myocardial ischemia-reperfusion (I/R) injury in vitro. We employed the oxygen-glucose deprivation and reperfusion (OGD/R) model of H9c2 cells and used lentiviral infection to overexpress Trx2. H9c2 cell viability and injury assays were conducted using a Cell Counting Kit-8 (CCK-8) and alactate dehydrogenase (LDH) kit. The effects of Trx2 on autophagy and apoptosis were measured by transmission electron microscopy (TEM), western blot, and flow cytometry...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28386289/sodium-tanshinone-iia-sulfonate-prevents-radiation-induced-toxicity-in-h9c2-cardiomyocytes
#11
Wenjing Zhang, Yi Li, Rui Li, Yaya Wang, Mengwen Zhu, Bowen Wang, Yanling Li, Dongyun Li, Ping Xie, Bin Liu
The present study was designed to elucidate the key parameters associated with X-ray radiation induced oxidative stress and the effects of STS on X-ray-induced toxicity in H9c2 cardiomyocytes. Cytotoxicity of STS and radiation was assessed by MTT. Antioxidant activity was evaluated by SOD and MDA. Apoptosis was measured by the flow cytometry, Hoechst 33258, clonogenic survival assay, and western blot. It was found that the cell viability of H9c2 cells exposed to X-ray radiation was significantly decreased in a dose-dependent manner and was associated with cell cycle arrest at the G0/G1 phase as well as apoptosis...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28384410/lingonberry-anthocyanins-protect-cardiac-cells-from-oxidative-stress-induced-apoptosis
#12
Cara K Isaak, Jay C Petkau, Heather Joy Blewett, Karmin O, Yaw L Siow
Lingonberry grown in Northern Manitoba, Canada contains exceptionally high levels of anthocyanins and other polyphenols. Previous studies from our lab have shown that lingonberry anthocyanins can protect H9c2 cells from ischemia-reperfusion injury and anthocyanin-rich diets have been shown to be associated with decreased cardiovascular disease and mortality. Oxidative stress can impair function and trigger apoptosis in cardiomyocytes. This study investigated the protective effects of physiologically relevant doses of lingonberry extracts and pure anthocyanins against hydrogen peroxide-induced cell death...
April 6, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28384228/doxycycline-protects-against-ros-induced-mitochondrial-fragmentation-and-iso-induced-heart-failure
#13
Adam Riba, Laszlo Deres, Krisztian Eros, Aliz Szabo, Klara Magyar, Balazs Sumegi, Kalman Toth, Robert Halmosi, Eszter Szabados
In addition to their anti-bacterial action, tetracyclines also have complex biological effects, including the modification of mitochondrial protein synthesis, metabolism and gene-expression. Long-term clinical studies have been performed using tetracyclines, without significant side effects. Previous studies demonstrated that doxycycline (DOX), a major tetracyclin antibiotic, exerted a protective effect in animal models of heart failure; however, its exact molecular mechanism is still unknown. Here, we provide the first evidence that DOX reduces oxidative stress-induced mitochondrial fragmentation and depolarization in H9c2 cardiomyocytes and beneficially alters the expression of Mfn-2, OPA-1 and Drp-1 -the main regulators of mitochondrial fusion and fission-in our isoproterenol (ISO)-induced heart failure model, ultimately decreasing the severity of heart failure...
2017: PloS One
https://www.readbyqxmd.com/read/28383511/antioxidant-properties-and-oxidative-transformation-of-different-chromone-derivatives
#14
Evelin Csepanyi, Peter Szabados-Furjesi, Attila Kiss-Szikszai, Lisa M Frensemeier, Uwe Karst, Istvan Lekli, David D Haines, Arpad Tosaki, Istvan Bak
Nowadays, there is an increase in the application of natural products for the prevention of different disorders or adjuvant substances next to pharmacological treatment. Phytochemicals include different chromone derivatives, which possess a wide spectrum of biological activity. The aim of the present study was the investigation of the antioxidant activity, cytotoxicity and oxidative transformation of nine chromone derivatives. First, we investigated the radical scavenging activity (ABTS), the oxygen radical absorption capacity (ORAC) and the ferric reducing antioxidant power (FRAP) of the investigated molecules...
April 6, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28378219/cardioprotective-effect-of-kr-33889-a-novel-parp-inhibitor-against-oxidative-stress-induced-apoptosis-in-h9c2-cells-and-isolated-rat-hearts
#15
Eun-Seok Park, Do-Hyun Kang, Jun Chul Kang, Yong Chang Jang, Min-Ju Lee, Hun-Jong Chung, Kyu Yang Yi, Dae-Eun Kim, Bokyung Kim, Hwa-Sup Shin
Oxidative stress plays a critical role in cardiac injury during ischemia/reperfusion (I/R). Despite a potent cardioprotective activity of KR-33889, a novel poly (ADP-ribose) polymerase inhibitor, its underlying mechanism remains unresolved. This study was designed to investigate the protective effects of KR-33889 against oxidative stress-induced apoptosis in rat cardiomyocytes H9c2 cells and isolated rat hearts. H2O2 caused severe injury to H9c2 cells, mainly due to apoptosis, as revealed by TUNEL assay. However, KR-33889 pretreatment significantly attenuated H2O2-induced apoptosis of H9c2 cells, which was accompanied by decrease in expression of both cleaved caspase-3 and Bax and increase in Bcl-2 expression and the ratio of Bcl-2/Bax...
April 4, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28377726/lysophosphatidic-acid-pretreatment-attenuates-myocardial-ischemia-reperfusion-injury-in-the-immature-hearts-of-rats
#16
Haibo Chen, Si Liu, Xuewen Liu, Jinjing Yang, Fang Wang, Xiangfeng Cong, Xi Chen
The cardioprotection of the immature heart during cardiac surgery remains controversial due to the differences between the adult heart and the newborn heart. Lysophosphatidic acid (LPA) is a small bioactive molecule with diverse functions including cell proliferation and survival via its receptor: LPA1-LPA6. We previously reported that the expressions of LPA1 and LPA3 in rat hearts were much higher in immature hearts and then declined rapidly with age. In this study, we aimed to investigate whether LPA signaling plays a potential protective role in immature hearts which had experienced ischemia/reperfusion (I/R) injury...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28374891/short-term-hypoxia-reverses-ox-ldl-induced-cd36-and-glut4-switching-metabolic-pathways-in-h9c2-cardiomyoblast-cells
#17
Yeh-Peng Chen, Hsi-Hsien Hsu, Rathinasamy Baskaran, Su-Ying Wen, Chia-Yao Shen, Cecilia-Hsuan Day, Tsung-Jung Ho, Viswanadha Vijaya Padma, Wei-Wen Kuo, Chih-Yang Huang
High levels of circulating low-density lipoproteins (LDL, plasma proteins that carry cholesterol and triglycerides) are associated with type 2 diabetes, arteriosclerosis, obesity and hyperlipidemia. In the heart, the accumulation of oxidized low-density lipoprotein (Ox-LDL) has been proposed to play a role in the development of cardiovascular disease. We obtain cholesterol from animals and animal-derived foods such as milk, eggs and cheese. In previous studies, the ratio of low-density lipoprotein (LDL) and high-density lipoprotein (HDL) was shown to be important for our health...
April 4, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28368536/transcription-factor-crem-mediates-high-glucose-response-in-cardiomyocytes-and-in-a-male-mouse-model-of-prolonged-hyperglycemia
#18
Saviana A Barbati, Claudia Colussi, Lorenza Bacci, Aurora Aiello, Agnese Re, Egidio Stigliano, Andrea M Isidori, Claudio Grassi, Alfredo Pontecorvi, Antonella Farsetti, Carlo Gaetano, Simona Nanni
This study aims at investigating the epigenetic landscape of cardiomyocytes exposed to long elevated glucose levels in vitro and in vivo Exposure of mouse HL-1 and rat differentiated H9C2 cardiomyocyte cell lines to high glucose (30 mM) for 72 hours determined some epigenetic changes including upregulation of class I and III HDAC protein levels and activity, inhibition of histone acetylase p300 activity, increase in histone H3 lysine (K) 27 trimethylation (H3K27me3) and reduction in H3K9 acetylation (H3K9Ac)...
March 22, 2017: Endocrinology
https://www.readbyqxmd.com/read/28367221/rutin-protects-against-pirarubicin-induced-cardiotoxicity-through-tgf-%C3%AE-1-p38-mapk-signaling-pathway
#19
Yadi Wang, Yang Zhang, Bo Sun, Qing Tong, Liqun Ren
We investigated the potential protective effect of rutinum (RUT) against pirarubicin- (THP-) induced cardiotoxicity. THP was used to induce toxicity in rat H9c2 cardiomyoblasts. Positive control cells were pretreated with a cardioprotective agent dexrazoxane (DZR) prior to treatment with THP. Some of the cells were preincubated with RUT and a p38 mitogen-activated protein kinase (MAPK) inhibitor, SB203580, both individually and in combination, prior to THP exposure. At a dose range of 30-70 μM, RUT significantly prevented THP-induced reduction in cell viability; the best cardioprotective effect was observed at a dose of 50 μM...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28364596/cardioprotective-effects-of-calcitonin-gene-related-peptide-in-isolated-rat-heart-and-in-h9c2-cells-via-redox-signaling
#20
Francesca Tullio, Claudia Penna, Karine Cabiale, Saveria Femminò, Marco Galloni, Pasquale Pagliaro
The calcitonin-gene-related-peptide (CGRP) release is coupled to the signaling of Angeli's salt in determining vasodilator effects. However, it is unknown whether CGRP is involved in Angeli's salt cardioprotective effects and which are the mechanisms of protection. We aimed to determine whether CGRP is involved in myocardial protection induced by Angeli's salt. We also analyzed the intracellular signaling pathway activated by CGRP. Isolated rat hearts were pre-treated with Angeli's salt or Angeli's salt plus CGRP8-37, a specific CGRP-receptor antagonist, and subjected to ischemia (30-min) and reperfusion (120-min)...
March 29, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
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