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https://www.readbyqxmd.com/read/29218015/trimethylamine-n-oxide-supplementation-abolishes-the-cardioprotective-effects-of-voluntary-exercise-in-mice-fed-a-western-diet
#1
Hongqi Zhang, Jian Meng, Haiyan Yu
Excessive consumption of western diet (WD) induces obesity, resulting in cardiac dysfunction. Voluntary exercise ameliorates WD-induced obesity, but its effect on cardiac dysfunction remains unclear. Recent evidence suggests that elevated trimethylamine N-oxide (TMAO), a gut microbe-derived metabolite, can impair cardiac function in WD-induced obesity. We hypothesized that cardiac dysfunction in WD-induced obesity would be prevented by voluntary exercise but abolished by TMAO supplementation. Male CD1 mice fed a WD were assigned to sedentary, exercise or exercise with TMAO treatment for 8 weeks...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29216197/shift-toward-greater-pathologic-post-myocardial-infarction-remodeling-with-loss-of-the-adaptive-hypertrophic-signaling-of-alpha1-adrenergic-receptors-in-mice
#2
Che-Chung Yeh, Yanying Fan, Yanchun Xu, Yi-Lin Yang, Paul C Simpson, Michael J Mann
RATIONALE: We have hypothesized that post-infarction cardiac remodeling can be influenced by shifts in the balance between intracellular mediators of "pathologic" and "physiologic" hypertrophy. Although alpha1 adrenergic receptors (alpha1-ARs) mediate pro-adaptive hypertrophy during pressure overload, little is known about their role or downstream mediators after myocardial infarction. METHODS: We performed loss-of-function experiments via coronary ligation in alpha1A-AR knockout (AKO) mice...
2017: PloS One
https://www.readbyqxmd.com/read/29214686/myricetin-attenuated-lps-induced-cardiac-injury-in-vivo-and-in-vitro
#3
Nan Zhang, Hong Feng, Hai-Han Liao, Si Chen, Zheng Yang, Wei Deng, Qi-Zhu Tang
Sepsis induced myocardial dysfunction (SIMD) is a common complication and leads to an increased mortality. SIMD is closely related to inflammation and oxidative stress. Myricetin exhibits strong capacities of anti-inflammation and anti-oxidative stress, but its pharmacological effects for lipopolysaccharide (LPS) induced cardiac injury remains undefined. This study aimed to explore whether myricetin was efficient to alleviate SIMD in mice and neonatal rat cardiomyocytes injury. Mice administrated with myricetin (100 mg/kg, po, bid) or vehicle groups were challenged with LPS (10 mg/kg, ip), and cardiac functions examined by echocardiography after 12 hr LPS exposure...
December 7, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/29212219/microrna-126a-5p-enhances-myocardial-ischemia-reperfusion-injury-through-suppressing-hspb8-expression
#4
Bimei Jiang, Yanjuan Liu, Pengfei Liang, Yuanbin Li, Zhenguo Liu, Zhongyi Tong, Qinglan Lv, Meidong Liu, Xianzhong Xiao
Previously, we found several genes are involved in myocardial ischemia-reperfusion (M-I/R) injury. In this report, we first developed a mouse model of M-I/R injury and demonstrated microRNA-126a-5p was associated with the M-I/R injury by using high-throughput microRNA expression analysis. We further investigated the expression and function of microRNA-126a-5p during mouse M-I/R injury. We observed high expression of microRNA-126a-5p in the M-I/R mice and increased levels of LDH and CK-MB (damage markers) in the serum...
November 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/29208771/advanced-iron-overload-cardiomyopathy-in-a-genetic-murine-model-is-rescued-by-resveratrol-therapy
#5
Subhash K Das, Pavel Zhabyeyev, Ratnadeep Basu, Vaibhav B Patel, Jason R B Dyck, Zamaneh Kassiri, Gavin Y Oudit
Iron-overload cardiomyopathy is prevalent on a worldwide basis and is a major co-morbidity in patients with genetic hemochromatosis and secondary iron overload. Therapies are limited in part due to lack of a valid pre-clinical model, which recapitulates advanced iron-overload cardiomyopathy. Male hemojuvelin knockout (HJVKO) mice, which lack hemojuvelin (HJV), a bone morphogenetic co-receptor protein required for hepcidin expression and systemic iron homeostasis, were fed a high iron diet starting at 4 weeks of age for a duration of 1 year...
December 5, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/29184496/andrographolide-protects-against-aortic-banding-induced-experimental-cardiac-hypertrophy-by-inhibiting-mapks-signaling
#6
Qing Q Wu, Jian Ni, Ning Zhang, Hai H Liao, Qi Z Tang, Wei Deng
Despite therapeutic advances, heart failure-related mortality rates remain high. Therefore, understanding the pathophysiological mechanisms involved in the remodeling process is crucial for the development of new therapeutic strategies. Andrographolide (Andr), a botanical compound, has potent cardio-protective effects due to its ability to inhibit mitogen-activated protein kinases (MAPKs). Andr has also been shown to inhibit inflammation and apoptosis, which are factors related to cardiac hypertrophy. Our aim was to evaluate the effects of Andr on cardiac hypertrophy and MAPKs activation...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29180214/thioredoxin-1-attenuates-sepsis-induced-cardiomyopathy-after-cecal-ligation-and-puncture-in-mice
#7
Rickesha L Wilson, Vaithinathan Selvaraju, Rajesh Lakshmanan, Mahesh Thirunavukkarasu, Jacob Campbell, David W McFadden, Nilanjana Maulik
BACKGROUND: Sepsis is a leading cause of mortality among patients in intensive care units across the USA. Thioredoxin-1 (Trx-1) is an essential 12 kDa cytosolic protein that, apart from maintaining the cellular redox state, possesses multifunctional properties. In this study, we explored the possibility of controlling adverse myocardial depression by overexpression of Trx-1 in a mouse model of severe sepsis. METHODS: Adult C57BL/6J and Trx-1Tg/+ mice were divided into wild-type sham (WTS), wild-type cecal ligation and puncture (WTCLP), Trx-1Tg/+sham (Trx-1Tg/+S), and Trx-1Tg/+CLP groups...
December 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/29179205/overexpression-of-timp3-protects-against-cardiac-ischemia-reperfusion-injury-by-inhibiting-myocardial-apoptosis-through-ros-mapks-pathway
#8
Hui Liu, Xibo Jing, Aiqiao Dong, Baobao Bai, Haiyan Wang
BACKGROUND/AIMS: Myocardial ischemia/reperfusion (I/R) injury remains a great challenge in clinical therapy. Tissue inhibitor of metalloproteinases 3 (TIMP3) plays a crucial role in heart physiological and pathophysiological processes. However, the effects of TIMP3 on I/R injury remain unknown. METHODS: C57BL/6 mice were infected with TIMP3 adenovirus by local delivery in myocardium followed by I/R operation or doxorubicin treatment. Neonatal rat cardiomyocytes were pretreated with TIMP3 adenovirus prior to anoxia/reoxygenation (A/R) treatment in vitro...
November 27, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29175209/the-protective-role-of-low-concentration-alcohol-in-high-fructose-induced-adverse-cardiovascular-events-in-mice
#9
Xiaoqi Wu, Bo Pan, Ying Wang, Lingjuan Liu, Xupei Huang, Jie Tian
Cardiovascular disease remains a worldwide public health issue. As fructose consumption is dramatically increasing, it has been demonstrated that a fructose-rich intake would increase the risk of cardiovascular disease. In addition, emerging evidences suggest that low concentration alcohol intake may exert a protective effect on cardiovascular system. This study aimed to investigate whether low-concentration alcohol consumption would prevent the adverse effects on cardiovascular events induced by high fructose in mice...
November 22, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29174818/inhibition-of-advanced-glycation-endproduct-age-rescues-against-streptozotocin-induced-diabetic-cardiomyopathy-role-of-autophagy-and-er-stress
#10
Zhaohui Pei, Qinqin Deng, Sara A Babcock, Emily Y He, Jun Ren, Yingmei Zhang
Diabetes mellitus leads to oxidative stress and contractile dysfunction in the heart. Although several rationales have been speculated, the precise mechanism behind diabetic cardiomyopathy remains elusive. This study was designed to assess the role of inhibition of advanced glycation endproducts (AGE) in streptozotocin (STZ)-induced diabetic cardiac dysfunction. Cardiac contractile function was assessed in normal C57BL/6 and STZ (200mg/kg, single injection and maintained for 2 wks)-induced diabetic mice treated with or without the AGE inhibitor aminoguanidine (50mg/kg/d in drinking water) for 2 weeks using echocardiography and IonOptix MyoCam techniques...
November 22, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29173610/endothelial-nitric-oxide-synthase-induced-hypertrophy-and-vascular-dysfunction-contribute-to-the-left-ventricular-dysfunction-in-caveolin-1-mice
#11
Annette Ebner, Nadine Kuerbis, Aljoscha Brandt, Birgit Zatschler, Sönke Weinert, David M Poitz, Bernd Ebner, Antje Augstein, Carsten Wunderlich, Ali El-Armouche, Ruth H Strasser
BACKGROUND: Caveolin-1 (Cav1)-/- mice display impaired development of left ventricular pressure and increased left ventricular wall thickness but no dilated ventricle; these are typical findings in patients with heart failure with preserved ejection fraction (HfpEF). Aiming to clarify if dysfunctional endothelial nitric oxide synthase (eNOS) influences cardiomyocyte contractility, cardiac conduction system, or afterload/vascular resistance, we studied Cav1-/-/eNOS-/- mice. METHODS: Cardiac function was assessed in vivo by pressure-volume-catheterization of the left ventricle, echocardiography and electrocardiography...
December 2017: Canadian Journal of Cardiology
https://www.readbyqxmd.com/read/29173012/interleukin-6-affects-aging-related-changes-of-the-ppar%C3%AE-pgc-1%C3%AE-axis-in-the-myocardium
#12
Tomasz A Bonda, Magdalena Dziemidowicz, Magdalena Sokołowska, Beata Szynaka, Ewa Waszkiewicz, Maria M Winnicka, Karol A Kamiński
Aging is related to gradual increase of interleukin 6 (IL-6) plasma level that affects peroxisome proliferator-activated receptor (PPAR) expression. We evaluated age-related changes in cardiac expression of PPARα, its coactivator PGC-1α, and selected downstream proteins in mice with systemic IL-6 knockout (IL6KO). Male C57BL6/J wild-type (WT) and IL6KO mice were used at the age of 16-20 weeks (young) and 24-30 months (senescent). Echocardiography and electron microscopy were applied to assess the function and ultrastructure of the heart...
November 27, 2017: Journal of Interferon & Cytokine Research
https://www.readbyqxmd.com/read/29167227/pericardial-adipose-tissue-regulates-granulopoiesis-fibrosis-and-cardiac-function-after-myocardial-infarction
#13
Michael Horckmans, Mariaelvy Bianchini, Donato Santovito, Remco T A Megens, Jean-Yves Springael, Irene Negri, Michele Vacca, Marco Di Eusanio, Antonio Moschetta, Christian Weber, Johan Duchene, Sabine Steffens
Background -The pericardial adipose tissue (AT) contains a high density of lymphoid clusters. Is unknown whether these clusters play a role in post-myocardial infarction (MI) inflammatory responses and cardiac outcome. Methods -Lymphoid clusters were examined in epicardial AT of humans with or without coronary artery disease (CAD). Murine pericardial lymphoid clusters were visualized in mice subjected to coronary artery ligation. To study the relevance of pericardial clusters during inflammatory responses after MI, we surgically removed the pericardial AT, performed B cell depletion and GM-CSF blockade...
November 22, 2017: Circulation
https://www.readbyqxmd.com/read/29166724/-beneficial-effects-of-schisandrin-b-on-the-cardiac-structure-and-function-in-a-mice-model-of-myocardial-infarction
#14
P S Chen, J Liu, H Y Meng, P Wu, Z J Yang
Objective: To investigate whether Schisandrin B (Sch B) could improve cardiac structure and function in myocardial infarction (MI) mice and related mechanisms. Methods: Male C57BL/6J mice were randomized into sham (n=8), MI+ Sch B (n=24, 80 mg·kg(-1)·d(-1) per gavage) or MI+ vehicle (n=24, equal volume). After treatment for 3 weeks, cardiac function was detected by echocardiography measurement.Infarction size was measured by Evans blue and TTC staining.HE and Masson trichrome staining were used to observe the myocardial inflammation, structure and fibrosis...
November 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/29162747/therapeutic-effect-of-a-novel-wnt-pathway-inhibitor-on-cardiac-regeneration-after-myocardial-infarction
#15
Chunyu Zeng, Dezhong Yang, Wenbin Fu, Liangpeng Li, Xuewei Xia, Qiao Liao, Rongchuan Yue, Hongmei Chen, Xiongwen Chen, Songzhu An, Wei Eric Wang
After myocardial infarction (MI), the heart is difficult to repair because of great loss of cardiomyoctyes and lack of cardiac regeneration. Novel drug candidates that aim at reducing pathological remodeling and stimulating cardiac regeneration are highly desirable. In this study, we identified if and how a novel porcupine inhibitor CGX1321 influenced MI and cardiac regeneration. Permanent ligation of left anterior descending (LAD) coronary artery was performed in mice to induce MI injury. Cardiac function was measured by echocardiography, infarct size was examined by TTC staining...
November 21, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29157817/cardioprotective-action-of-the-aqueous-extract-of-terminalia-arjuna-bark-against-toxicity-induced-by-doxorubicin
#16
Sarah Bishop, Shi J Liu
BACKGROUND: The aqueous extract of Terminalia arjuna (TA) bark (TAAqE) has been shown to have a direct inotropic effect on ventricular myocytes. Active constituents of TAAqE contain various flavonoids and proanthocyanidins, some of which are known to have antioxidant activities. Whether TAAqE affords a cardioprotective action against oxidative stress (OS) remains unclear. PURPOSE: Increased OS is one of the major mechanisms underlying cardiotoxicity induced by doxorubicin (DOX), a commonly-used anticancer agent...
December 1, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29155983/meox1-accelerates-myocardial-hypertrophic-decompensation-through-gata4
#17
Dan Lu, Jizheng Wang, Jing Li, Feifei Guan, Xu Zhang, Wei Dong, Ning Liu, Shan Gao, Lianfeng Zhang
Aims: Pathological hypertrophy is the result of gene network regulation, which ultimately leads to adverse cardiac remodelling and heart failure (HF), and is accompanied by the reactivation of a 'foetal gene programme'. The Mesenchyme homeobox 1 (Meox1) gene is one of the foetal programme genes. Meox1 may play a role in embryonic development, but its regulation of pathological hypertrophy is not known. Therefore, this study investigated the effect of Meox1 on pathological hypertrophy, including familial and pressure overload-induced hypertrophy, and its potential mechanism of action...
November 16, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/29155760/echocardiographic-and-histological-examination-of-cardiac-morphology-in-the-mouse
#18
Delphine Baudouy, Jean-François Michiels, Ana Vukolic, Kay-Dietrich Wagner, Nicole Wagner
An increasing number of genetically modified mouse models has become available in recent years. Moreover, the number of pharmacological studies performed in mice is high. Phenotypic characterization of these mouse models also requires the examination of cardiac function and morphology. Echocardiography and magnetic resonance imaging (MRI) are commonly used approaches to characterize cardiac function and morphology in mice. Echocardiographic and MRI equipment specialized for use in small rodents is expensive and requires a dedicated space...
October 26, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29152121/longitudinal-evaluation-of-myocardial-glucose-metabolism-and-contractile-function-in-obese-type-2-diabetic-db-db-mice-using-small-animal-dynamic-18-f-fdg-pet-and-echocardiography
#19
Kuan-Yin Ko, Yen-Wen Wu, Cheng-Wei Liu, Mei-Fang Cheng, Ruoh-Fang Yen, Wei-Shiung Yang
The aim was to evaluate sequential changes of myocardial glucose utilization and LV systolic function in db/db mice. Eight db/db and eight wild-type mice underwent plasma substrate analysis and dynamic (18)F-FDG PET at week 8 (W8), W10, W12, W14, and W16. (18)F-FDG uptake constant Ki and the rate of myocardial glucose uptake (MRGlu) were derived via Patlak graphic analysis. Another 8 db/db and 8 wild-type mice received echocardiography at W8, W12, and W16 and LV structure and function were measured. The db/db mice showed increased weights and glucose levels as they aged...
October 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/29138357/tadalafil-a-long-acting-phosphodiesterase-inhibitor-promotes-bone-marrow-stem-cell-survival-and-their-homing-into-ischemic-myocardium-for-cardiac-repair
#20
Ibrahim Elmadbouh, Muhammad Ashraf
The aim was to evaluate the tadalafil-mediated effects at molecular level on bone marrow-derived mesenchymal stem cells (MSCs) survival and their homing into the infarcted hearts to promote cardiac repair and improve function. MSCs were pretreated in vitro with inhibitors of PKG, MAPK, FasL, nitric oxide synthase (NOS) (L-NAME), CXCR4 (AMD3100), or miR-21 inhibitors (+/-luciferase construction +/-Fas) prior to tadalafil treatment for 2 h. These MSCs were then subjected to H2O2 stress to assess their injury...
November 2017: Physiological Reports
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