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Cardiac fibrosis

Jinah Jang, Hun-Jun Park, Seok-Won Kim, Heejin Kim, Ju Young Park, Soo Jin Na, Hyeon Ji Kim, Moon Nyeo Park, Seung Hyun Choi, Sun Hwa Park, Sung Won Kim, Sang-Mo Kwon, Pum-Joon Kim, Dong-Woo Cho
Stem cell therapy is a promising therapeutic method for the treatment of ischemic heart diseases; however, some challenges prohibit the efficacy after cell delivery due to hostile microenvironment of the injured myocardium. 3D printed pre-vascularized stem cell patch can enhance the therapeutic efficacy for cardiac repair through promotion of rapid vascularization after patch transplantation. In this study, stem cell-laden decellularized extracellular matrix bioinks are used in 3D printing of pre-vascularized and functional multi-material structures...
October 14, 2016: Biomaterials
Joseph B Fisher, Audrey Horst, Tina Wan, Min-Su Kim, John Auchampach, John Lough
Tat-interactive protein 60 (Tip60), encoded by the Kat5 gene, is a member of the MYST family of acetyltransferases. Cancer biology studies have shown that Tip60 induces the DNA damage response, apoptosis, and cell-cycle inhibition. Although Tip60 is expressed in the myocardium, its role in cardiomyocytes (CMs) is unclear. Earlier studies here showed that application of cardiac stress to globally targeted Kat5+/-haploinsufficient mice resulted in inhibition of apoptosis and activation of the CM cell-cycle, despite only modest reduction of Tip60 protein levels...
2016: PloS One
Vikrant Rai, Poonam Sharma, Swati Agrawal, Devendra K Agrawal
Heart disease causing cardiac cell death due to ischemia-reperfusion injury is a major cause of morbidity and mortality in the United States. Coronary heart disease and cardiomyopathies are the major cause for congestive heart failure, and thrombosis of the coronary arteries is the most common cause of myocardial infarction. Cardiac injury is followed by post-injury cardiac remodeling or fibrosis. Cardiac fibrosis is characterized by net accumulation of extracellular matrix proteins in the cardiac interstitium and results in both systolic and diastolic dysfunctions...
October 20, 2016: Molecular and Cellular Biochemistry
Patrick Krumm, Karin A L Mueller, Karin Klingel, Ulrich Kramer, Marius S Horger, Tanja Zitzelsberger, Reinhard Kandolf, Meinrad Gawaz, Konstantin Nikolaou, Bernhard D Klumpp, Joerg C Henes
BACKGROUND: To determine morphological and functional cardiovascular magnetic resonance (CMR) patterns in histopathologically confirmed myocardial involvement in patients with systemic sclerosis (SSc). METHODS: Twenty patients (6 females; mean age 41 ± 11 years) with histopathologically proven cardiac involvement in SSc in the years 2008-2016 were retrospectively evaluated. Morphological, functional and late gadolinium enhancement (LGE) images were acquired in standard angulations at 1...
October 21, 2016: Journal of Cardiovascular Magnetic Resonance
Ruijie Liu, Hadi Khalil, Suh-Chin J Lin, Michelle A Sargent, Allen J York, Jeffery D Molkentin
Nemo-like kinase (NLK) is an evolutionary conserved serine/threonine protein kinase implicated in development, proliferation and apoptosis regulation. Here we identified NLK as a gene product induced in the hearts of mice subjected to pressure overload or myocardial infarction injury, suggesting a potential regulatory role with pathological stimulation to this organ. To examine the potential functional consequences of increased NLK levels, cardiac-specific transgenic mice with inducible expression of this gene product were generated, as well as cardiac-specific Nlk gene-deleted mice...
2016: PloS One
Fabiana de Salvi Guimarães, Wilson Max Almeida Monteiro de Moraes, Luis Henrique Marchesi Bozi, Pâmela R Souza, Ednei Luiz Antonio, Danilo Sales Bocalini, Paulo José Ferreira Tucci, Daniel Araki Ribeiro, Patricia Chakur Brum, Alessandra Medeiros
Dexamethasone is a potent and widely used anti-inflammatory and immunosuppressive drug. However, recent evidences suggest that dexamethasone cause pathologic cardiac remodeling, which later impairs cardiac function. The mechanism behind the cardiotoxic effect of dexamethasone is elusive. The present study aimed to verify if dexamethasone-induced cardiotoxicity would be associated with changes in the cardiac net balance of calcium handling protein and calcineurin signaling pathway activation. Wistar rats (~400 g) were treated with dexamethasone (35 µg/g) in drinking water for 15 days...
October 19, 2016: Molecular and Cellular Biochemistry
Eirini Lioudaki, Martin Whyte
Patients with higher liver iron stores are likely to have a worse cardiac outcome following noncompliance with chelation. Cardiovascular magnetic resonance identifies myocardial siderosis allowing optimization of iron chelation regimes. Diabetes puts thalassemic patients at increased risk of myocardial fibrosis. Dual chelation therapy with deferoxamine and deferiprone offers improved cardiac outcomes.
October 2016: Clinical Case Reports
Rosita Zakeri, Gilles Moulay, Qiang Chai, Ozgur Ogut, Saad Hussain, Hiroyuki Takahama, Tong Lu, Xiao-Li Wang, Wolfgang A Linke, Hon-Chi Lee, Margaret M Redfield
BACKGROUND: Left atrial (LA) compliance and contractility influence left ventricular stroke volume. We hypothesized that diminished LA compliance and contractile function occur early during the development of heart failure with preserved ejection fraction (HFpEF) and impair overall cardiac performance. METHODS AND RESULTS: Cardiac magnetic resonance imaging, echocardiography, left ventricular and LA pressure-volume studies, and tissue analyses were performed in a model of early HFpEF (elderly dogs, renal wrap-induced hypertension, exogenous aldosterone; n=9) and young control dogs (sham surgery; n=13)...
October 2016: Circulation. Heart Failure
Catarina Francisco, João Sérgio Neves, Inês Falcão-Pires, Adelino Leite-Moreira
Adiponectin is the most abundant adipokine and exhibits anti-inflammatory, antiatherogenic and antidiabetic properties. Unlike other adipokines, it inversely correlates with body weight and obesity-linked cardiovascular complications. Diastolic dysfunction is the main mechanism responsible for approximately half of all heart failure cases, the so-called heart failure with preserved ejection fraction (HFpEF), but therapeutic strategies specifically directed towards these patients are still lacking. In the last years, a link between adiponectin and diastolic dysfunction has been suggested...
October 18, 2016: Cardiovascular Drugs and Therapy
Jiaxin Li, Yingnan Dai, Zhendong Su, Guoqian Wei
To investigate the effects of miR-9 on high glucose (HG)-induced cardiac fibrosis in human cardiac fibroblasts (HCFs), and to establish the mechanism underlying these effects. HCFs were transfected with miR-9 inhibitor or mimic, and then treated with normal or high glucose. Cell viability and proliferation were detected by using the Cell Counting Kit-8 (CCK-8) assay and Brdu-ELISA assay. Cell differentiation and collagen accumulation of HCFs were detected by qRT-PCR and Western blot assays, respectively...
October 18, 2016: Bioscience Reports
Aneta Kruszec, Przemysław Kotyla
Systemic sclerosis (SSc) is coccenctive tissue disease characterized by progressive fibrosis of the skin and internal organs leading to their failure, autoimmune dysfunction and the morphological and functional changes in the blood vessels. Primary cardiac involvement is common for patients with SSc, and when it becomes clinically evident appears as a bad prognostic factor. There is increasing evidence that heart failure occurs as a result of repeated episodes of ischemia leading to focal irreversible myocardial fibrosis...
September 29, 2016: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
Attila Oláh, Dalma Kellermayer, Csaba Mátyás, Balázs Tamás Németh, Árpád Lux, Lilla Szabó, Marianna Török, Mihály Ruppert, Anna Meltzer, Alex Ali Sayour, Kálmán Benke, István Hartyánszky, Béla Merkely, Tamás Radovits
PURPOSE: Long-term exercise training is associated with characteristic cardiac adaptation, termed athlete's heart. Our research group previously characterized in vivo left ventricular (LV) function of exercise-induced cardiac hypertrophy in detail in a rat model, however the effect of detraining on LV function is still unclear. We aimed at evaluating the reversibility of functional alterations of athlete's heart after detraining. METHODS: Rats (n=16) were divided into detrained exercised (DEx) and detrained control (DCo) groups...
October 14, 2016: Medicine and Science in Sports and Exercise
Jin-Jer Chen, Wen-Rui Hao, Kuan-Cheng Chang, Ju-Chi Liu
OBJECTIVE: Cardiac fibrosis is the major pathophysiological process, contributing to the development of diastolic heart failure. We examine the role of macrophage-derived galectin-3 (gal-3) in cardiac fibrosis and diastolic function in response to transverse aortic constriction (TAC). DESIGN AND METHOD: wild-type (WT) and gal-3 knock-out (KO) mice subjected to TAC; immunohistochemistry for myocardial macrophage infiltration,gal-3,and CTGF (connective tissue growth factor) expression; picrosirius red stain for myocardial fibrosis; FACS flow- cytometry for defining the origin of myocardial macrophages...
September 2016: Journal of Hypertension
Caojian Zuo
OBJECTIVE: Cardiac fibroblasts play a vital role in the progression of fibrotic cardiac remodeling in hypertensive and failing heart. Osteoglycin (OGN) is implicated as a key regulator of left ventricular mass. However, its precise molecular role in cardiac fibrosis remains unknown. This study aims to investigate the impact of OGN in hypertensive cardiac remodeling. DESIGN AND METHOD: OGN deficient mice and its wildtype (WT) littermates were subjected to either angiotensin II (Ang II) infusion or pressure overload induced by transverse aortic constriction (TAC)...
September 2016: Journal of Hypertension
Qiongying Wang, Peng Chang, Han Xu, Feng Bai, Jing Yu
OBJECTIVE: Hypertension induced hypertrophy and diastolic dysfunction and is associated with cardiac oxidation and reduced NO production. We hypothesized that tetrahydrobiopterin (BH4) can regulate the phosphatidylinositol 3-kinase/protein kinase B (PI3K/Akt) signaling pathway and reverse cardiac hypertrophy and diastolic dysfunction in spontaneously hypertensive rats. DESIGN AND METHOD: Ten-week-old male spontaneously hypertensive rats (SHR) and age-matched normotensive control Wistar-Kyoto (WKY) rats were divided into five groups, WKY,WKY + BH4, SHR, SHR + BH4 and SHR + VAL...
September 2016: Journal of Hypertension
Sheila Patel, Elena Velkoska, Louise Burrell
OBJECTIVE: Left ventricular hypertrophy (LVH) is prevalent in chronic kidney disease (CKD) and a major cause of cardiovascular morbidity and mortality. Treatment of LVH in CKD is based on blood pressure control. The Kruppel like factor 15 (KLF15) is expressed in the heart and acts as a repressor of cardiac hypertrophy and fibrosis. The role of cardiac KLF15 in the development of LVH in rats with CKD secondary to subtotal nephrectomy (STNx) or the effects of ACE inhibition on KLF15 levels has not been addressed previously...
September 2016: Journal of Hypertension
Koki Takane, Yu Hasegawa, Lin Bowen, Takashi Yokoo, Shokei Kim-Mitsuyama
OBJECTIVE: Increasing evidences suggest that patients with Alzheimer's disease (AD) show not only cognitive impairment but also physical disorder including cardiac dysfunction and sarcopenia. In this study, we investigated whether central angiotensin II, inducer of oxidative stress, led to the organ dysfunction in a mouse model of AD. DESIGN AND METHOD: 5XFAD which is an animal model of AD and C57BL/6 (WT) were each assigned to 1) normal saline and 2) angiotensin II (20 mg/kg/h) groups...
September 2016: Journal of Hypertension
Francisco J Rios, Katie Y Hood, A Karvey, Karla B Neves, Panagiota Anyfanti, Ryszard Nosalski, Livia L Camargo Ll, Augusto C Montezano, Rhian M Touyz
OBJECTIVE: TRPM7 is cation channel with intrinsic kinase activity important for cellular Mg homeostasis. We recently showed that TRPM7-kinase plays a role in aldosterone-mediated vascular effects and inflammation. Here we explored the putative role of TRPM7-kinase in cardiac fibrosis and vascular function in aldosterone-induced hypertension in mice. DESIGN AND METHOD: Wild-type (WT) or heterozygote TRPM7-kinase domain (TRPM7+/-) mice were treated with infused aldosterone (600 μg/Kg/day) and NaCl 1% in drinking water (aldo/salt) for 4 weeks...
September 2016: Journal of Hypertension
Che Wei Liao, Chi Sheng Hung, Chia Hung Chou, Yen Tin Lin, Xue Ming Wu, Yi Yao Chang, Ying Hsien Chen, Vin Cent Wu, Yi Lwun Ho, Kwan Dun Wu, Yen Hung Lin
OBJECTIVE: Aldosterone induces myocardial fibrosis. The tissue inhibitor of metalloproteinases-1 (TIMP-1) is a key factor of myocardial fibrosis and diastolic dysfunction, but the effect of aldosterone on TIMP-1 expression remains unclear. We tested the hypothesis that aldosterone induces TIMP-1 expression and contributes to the fibrotic process. DESIGN AND METHOD: In the human study, we prospectively enrolled 54 patients with primary aldosteronism. Plasma TIMP-1 and echocardiographic parameters were measured...
September 2016: Journal of Hypertension
Ayako Uchinaka, Yuri Kawashima, Yuki Sano, Mamoru Yoneda, Shogo Ito, Yusuke Sano, Kai Nagasawa, Natsumi Matsuura, Yuichiro Yamada, Toyoaki Murohara, Kohzo Nagata
OBJECTIVE: The pineal hormone melatonin, which regulates the body's circadian rhythm, possesses anti-oxidative and anti-inflammatory effects and thereby improves metabolic disorders. Ramelteon is a potent and highly selective agonist of melatonin receptors and attenuates age-associated hypertension and body weight gain in spontaneously hypertensive rats. However, the effects of ramelteon on cardiovascular and metabolic disorders in metabolic syndrome (MetS) remain unclear. We investigated the effects of ramelteon on cardiac and adipose tissue pathology in a rat model of MetS...
September 2016: Journal of Hypertension
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