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https://www.readbyqxmd.com/read/28928469/activation-of-mir-34a-5p-sirt1-p66shc-pathway-contributes-to-doxorubicin-induced-cardiotoxicity
#1
Jie-Ning Zhu, Yong-Heng Fu, Zhi-Qin Hu, Wen-Yu Li, Chun-Mei Tang, Hong-Wen Fei, Hui Yang, Qiu-Xiong Lin, De-Ming Gou, Shu-Lin Wu, Zhi-Xin Shan
The molecular mechanisms underlying anthracyclines-induced cardiotoxicity have not been well elucidated. MiRNAs were revealed dysregulated in the myocardium and plasma of rats received Dox treatment. MicroRNA-34a-5p (miR-34a-5p) was verified increased in the myocardium and plasma of Dox-treated rats, but was reversed in rats received Dox plus DEX treatments. Human miR-34a-5p was also observed increased in the plasma of patients with diffuse large B-cell lymphoma after 9- and 16-week epirubicin therapy. Up-regulation of miR-34a-5p was observed in Dox-induced rat cardiomyocyte H9c2 cells...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28928236/histone-deacetylase-inhibition-ameliorates-hypertension-and-hyperglycemia-in-a-model-of-cushing-s-syndrome
#2
Hae-Ahm Lee, Seol-Hee Kang, Mina Kim, Eunjo Lee, Hyun-Min Cho, Eun-Kyung Moon, Inkyeom Kim
Cushing's syndrome (CS) caused by hypercortisolism is occasionally accompanied by metabolic disorders such as hypertension, diabetes mellitus (DM), dyslipidemia and central obesity. Thus, morbidity and mortality, observed in cardiovascular disease, are elevated in patients with CS. We hypothesized that HDAC inhibition (HDACi) decreased transcriptional activity of glucocorticoid receptor (GR), which ameliorates hypertension and hyperglycemia in patients with CS. To establish an animal model of hypercortisolism, Sprague-Dawley rats were infused with adrenocorticotropic hormone (ACTH, 40 ng/day) or dexamethasone (Dex, 10 μg/day) via osmotic minipumps for 4 weeks...
September 19, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28923399/up-regulation-of-rho-associated-kinase-1-2-by-glucocorticoids-promotes-migration-invasion-and-metastasis-of-melanoma
#3
Gao-Xiang Huang, Yan Wang, Jie Su, Peng Zhou, Bo Li, Li-Juan Yin, Jian Lu
Although glucocorticoids (GCs) regulate proliferation, differentiation and apoptosis of tumor cells, their influence on metastasis of tumor cells is poorly understood. Melanoma is a type of skin cancers with high metastasis. We investigated the effect of GCs on metastasis of melanoma cells and its mechanism. We found that GCs significantly promoted the adhesion, migration, invasion of melanoma cells in vitro and lung metastasis in experimental melanoma metastasis mice. Dexamethasone (Dex), a synthetic GC, did not change the RhoA, RhoB and RhoC signalings, but significantly increased the expression and activity of Rho-associated kinase 1/2 (ROCK1/2)...
September 15, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28922697/low-frequency-ranibizumab-versus-dexamethasone-implant-for-macular-oedema-secondary-to-branch-retinal-vein-occlusion
#4
Bora Yuksel, Omer Karti, Ozan Celik, Suleyman Gokhan Kerci, Tuncay Kusbeci
BACKGROUND: The aim was to make a real-world comparison of the efficacy of ranibizumab, dexamethasone and grid laser treatments in macular oedema due to branch retinal vein occlusion (BRVO). METHODS: Forty-four eyes of 44 consecutive patients with macular oedema secondary to BRVO were included. Treatment arms comprised standard care (StCARE, n = 15), intravitreal ranibizumab (RNB, n = 14) and dexamethasone implant (DEX, n = 15). No rescue laser was performed in DEX and RNB groups...
September 18, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/28919985/human-tumor-derived-exosomes-tex-regulate-treg-functions-via-cell-surface-signaling-rather-than-uptake-mechanisms
#5
Laurent Muller, Patricia Simms, Chang-Sook Hong, Michael I Nishimura, Edwin K Jackson, Simon C Watkins, Theresa L Whiteside
Tumor-derived exosomes (TEX) are ubiquitously present in the tumor microenvironment and plasma of cancer patients. TEX carry a cargo of multiple stimulatory and inhibitory molecules and deliver them to recipient cells, serving as a communication network for the tumor. The mechanisms TEX use for delivering messages to recipient cells were evaluated using PKH26-labeled TEX produced by cultured human tumor cells, exosomes produced by dendritic cells-derived exosomes (DEX), or exosomes isolated from plasma of cancer patients (EXO)...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28916331/depressive-like-phenotype-induced-by-prenatal-dexamethasone-in-mice-is-reversed-by-desipramine
#6
Mirko Conti, Stefan Spulber, Marilena Raciti, Sandra Ceccatelli
Exposure to prenatal insults has been associated with an increased risk for neuropsychiatric disorders, including depression, but the mechanisms are still poorly understood. Persistent alterations of the HPA axis feedback mechanism as well as adult impaired neurogenesis are believed to play a relevant role in the etiology of depression. In addition, growing evidence points at epigenetic reprogramming as a key factor. We have previously shown that prenatal exposure to the synthetic glucocorticoid dexamethasone (DEX) impairs neurogenesis and leads to late onset of depression-like behavior that does not respond to the SSRI antidepressant fluoxetine (FLX)...
September 12, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28914648/dexmedetomidine-maintains-its-direct-cardioprotective-effect-against-ischemia-reperfusion-injury-in-hypertensive-hypertrophied-myocardium
#7
Yusuke Yoshikawa, Naoyuki Hirata, Ryoichi Kawaguchi, Yasuyuki Tokinaga, Michiaki Yamakage
BACKGROUND: Dexmedetomidine (DEX) has a direct cardioprotective effect against ischemia/reperfusion injury through endothelial nitric oxide synthase (eNOS) phosphorylation via α2-adrenoreceptor (α2-AR). By using spontaneously hypertensive rat (SHR) and Wistar-Kyoto (WKY) rat models, the cardioprotective effect of DEX in hypertrophied myocardium and the differential characteristics of cardiac α2-AR and the I1 imidazoline receptor (I1R) were examined. METHODS: Langendorff-perfused rat hearts underwent 40 minutes of global ischemia followed by 120 minutes of reperfusion in the presence or absence of DEX before ischemia...
September 12, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28914292/ph-and-redox-dual-sensitive-polysaccharide-nanoparticles-for-the-efficient-delivery-of-doxorubicin
#8
Shengcai Yang, Zhaohui Tang, Dawei Zhang, Mingxiao Deng, Xuesi Chen
A pH and redox dual-sensitive biodegradable polysaccharide, succinic acid-decorated dextran-g-phenylalanine ethyl ester-g-cysteine ethyl ester (Dex-SA-l-Phe-l-Cys), was synthesized to load doxorubicin hydrochloride (DOX·HCl). The DOX-loaded nanoparticles, which were prepared in aqueous solution and free of organic solvent, could spontaneously self-assemble into uniform sizes. When loading DOX·HCl, mercapto Dex-SA-l-Phe-l-Cys was oxidized into a crosslinked disulfide linkage to form pH and redox dual-sensitive nanoparticles (DOX-S-NPs)...
September 15, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28904966/the-effect-of-oral-dexmedetomidine-premedication-on-preoperative-cooperation-and-emergence-delirium-in-children-undergoing-dental-procedures
#9
Sultan Keles, Ozlem Kocaturk
INTRODUCTION: The aim of this study was to detect the effect of 1 μg/kg of oral dexmedetomidine (DEX) as premedication among children undergoing dental procedures. MATERIALS AND METHODS: The study involved 100 children between 2 and 6 years of age, ASA I, who underwent full-mouth dental rehabilitation. The DEX group (n = 50) received 1 μg/kg DEX in apple juice, and the control group (n = 50) received only apple juice. The patients' scores on the Ramsay Sedation Scale (RSS), parental separation anxiety scale, mask acceptance scale, and pediatric anesthesia emergence delirium scale (PAEDS) and hemodynamic parameters were recorded...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28903184/dexmedetomidine-exerts-neuroprotective-effect-via-the-activation-of-the-pi3k-akt-mtor-signaling-pathway-in-rats-with-traumatic-brain-injury
#10
Min Shen, Shan Wang, Xin Wen, Xin-Rui Han, Yong-Jian Wang, Xiu-Min Zhou, Man-He Zhang, Dong-Mei Wu, Jun Lu, Yuan-Lin Zheng
OBJECTIVE: This study aims to explore the neuroprotective effects of dexmedetomidine (Dex) in rats suffering from traumatic brain injury (TBI) via the PI3K/Akt/mTOR signaling pathway. METHODS: A weight drop model was performed for TBI model establishment. A total of 150 Sprague Dawley rats were selected and assigned into control, sham, TBI, TBI+Dex, TBI+LY294002 (LY) and TBI+Dex+LY groups. Modified Neurological Severity Score (mNSS) was conducted in order to evaluate the neurological injury...
September 9, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28900504/platelet-targeted-delivery-of-peripheral-blood-mononuclear-cells-to-the-ischemic-heart-restores-cardiac-function-after-ischemia-reperfusion-injury
#11
Melanie Ziegler, Xiaowei Wang, Bock Lim, Ephraem Leitner, Franco Klingberg, Victoria Ching, Yu Yao, Dexing Huang, Xiao-Ming Gao, Helen Kiriazis, Xiao-Jun Du, Jody J Haigh, Alex Bobik, Christoph E Hagemeyer, Ingo Ahrens, Karlheinz Peter
One of the major hurdles in intravenous regenerative cell therapy is the low homing efficiency to the area where these cells are needed. To increase cell homing toward areas of myocardial damage, we developed a bispecific tandem single-chain antibody (Tand-scFvSca-1+GPIIb/IIIa) that binds with high affinity to activated platelets via the activated glycoprotein (GP)IIb/IIIa receptor, and to a subset of peripheral blood mononuclear cells (PBMC) which express the stem cell antigen-1 (Sca-1) receptor. Methods: The Tand-scFvSca-1+GPIIb/IIIa was engineered, characterized and tested in a mouse model of ischemia-reperfusion (IR) injury applying left coronary artery occlusion for 60 min...
2017: Theranostics
https://www.readbyqxmd.com/read/28895559/sustained-releasing-sponge-like-3d-scaffolds-for-bone-tissue-engineering-applications
#12
Vidya Chamundeswari Narasimhan, Yuan Siang Lui, Yon Jin Chuah, Jing Shi Elaine Tan, Dong An Wang, Say Chye Joachim Loo
Tissue engineering (TE) is envisaged to play a vital role in improving the quality of life by restoring, maintaining or enhancing tissue and organ functions. TE scaffolds that are two dimensional (2D) in structure suffer from undesirable issues, such as pore blockage, and does not close mimic the native extra-cellular matrix (ECM) in tissues. Significant efforts have therefore been channeled to fabricate three-dimensional (3D) scaffolds using various techniques, especially electrospinning. In this study, we propose a modified one-step electrospinning process to arrive at a 3D scaffolds with highly interconnected pores...
September 12, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28892924/comparison-of-pioglitazone-and-metformin-efficacy-against-glucocorticoid-induced-atherosclerosis-and-hepatic-steatosis-in-insulin-resistant-rats
#13
I M Nagendra Nayak, Koyagura Narendar, Patil Ashok M, M G Jamadar, V Hemanth Kumar
INTRODUCTION: Insulin Resistance is a major cause of Atherosclerosis (AS) and Non Alcoholic Fatty Liver Disease (NAFLD). These lipid alterations in blood vessels and liver may progress to cardiovascular abnormalities and cirrhosis respectively. Drugs like pioglitazone (PIO) and metformin (MET) are effective insulin sensitizers used in T2DM. But their efficacy and tolerability needs to be compared in IR associated abnormalities. AIM: To compare the efficacy of PIO and MET in glucocorticoid induced AS, Hepatic Steatosis (HS) and IR in albino rats...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28891909/improving-emotion-regulation-following-web-based-group-intervention-for-individuals-with-traumatic-brain-injury
#14
Theodore Tsaousides, Lisa Spielman, Maria Kajankova, Gabrielle Guetta, Wayne Gordon, Kristen Dams-OʼConnor
OBJECTIVE: Preliminary evaluation of the efficacy of a Web-based group intervention (Online EmReg) to improve emotion regulation (ER) in individuals with traumatic brain injury (TBI). DESIGN: Pre-/post-within-subject design with baseline, end-of-treatment, and 12-week follow-up assessments. PARTICIPANTS: Ninety-one individuals with TBI and deficits in ER. INTERVENTION: Twenty-four sessions of training in ER skills delivered by group videoconference...
September 2017: Journal of Head Trauma Rehabilitation
https://www.readbyqxmd.com/read/28888877/the-role-of-charge-in-the-toxicity-of-polymer-coated-cerium-oxide-nanomaterials-to-caenorhabditis-elegans
#15
Devrah A Arndt, Emily K Oostveen, Judy Triplett, D Allan Butterfield, Olga V Tsyusko, Blanche E Collin, Daniel L Starnes, Jian Cai, Jon B Klein, Richard Nass, Jason M Unrine
This study examined the impact of surface functionalization and charge on ceria nanomaterial toxicity to Caenorhabditis elegans. The examined endpoints included mortality, reproduction, protein expression, and protein oxidation profiles. Caenorhabditis elegans were exposed to identical 2-5nm ceria nanomaterial cores which were coated with cationic (diethylaminoethyl dextran; DEAE), anionic (carboxymethyl dextran; CM), and non-ionic (dextran; DEX) polymers. Mortality and reproductive toxicity of DEAE-CeO2 was approximately an order of magnitude higher than for CM-CeO2 or DEX-CeO2...
September 6, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28887923/anti-adipogenesis-mechanism-of-pterostilbene-through-the-activation-of-heme-oxygenase-1-in-3t3-l1-cells
#16
Young-Jin Seo, Kui-Jin Kim, Eun-Jeong Koh, Jia Choi, Boo-Yong Lee
BACKGROUND: Pterostilbene is a stilbenoid and major compound and has diverse biological activities, such as antioxidant, anti-cancer, and anti-inflammatory. However, it has not been shown whether pterostilbene affects the mitotic clonal expansion during adipogenesis in 3T3-L1 cells. PURPOSE: In the present study, we aimed to demonstrate the detailed mechanism of pterostilbene on anti-adipogenesis in 3T3-L1 cells. METHODS: Preadipocytes were converted to adipocytes through treatment with MDI (IBMX; 3-isobutyl-1-methylxanthine, DEX; dexamethasone, insulin) in 3T3-L1 cells...
September 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28885063/treatment-free-interval-as-a-metric-of-patient-experience-and-a-health-outcome-of-value-for-advanced-multiple-myeloma-the-case-for-the-histone-deacetylase-inhibitor-panobinostat-a-next-generation-novel-agent
#17
Paul Richardson, Anuja Roy, Acharyya Suddhasatta, Ashok Panneerselvam, Estella Mendelson, Andreas Günther, Sagar Lonial, Hermann Einsele
BACKGROUND: Patients with relapsed or relapsed/refractory multiple myeloma (RRMM) face poor treatment options by the time third-line therapy is required, despite advances in overall survival in recent years. Treatment free interval (TFI) and opportunities to maintain quality of life (QoL) have been cited as additional measures of efficacy that can be utilized in personalized treatment decisions. METHODS: The clinical health outcomes data from PANORAMA-1, the pivotal phase-3 trial comparing panobinostat-bortezomib-dexamethasone (PAN-BTZ-DEX) with placebo (PBO)-BTZ-DEX in RRMM patients treated with 1 to 3 prior regimens, retrospectively assessed TFI as a health outcome measure and metric of patient treatment experience relevant to the RRMM population...
September 8, 2017: Expert Review of Hematology
https://www.readbyqxmd.com/read/28883989/osteoinductive-effects-of-preoperative-dexamethasone-in-human-dental-pulp-stem-cells-primary-culture
#18
Rani da Cunha Moretti, Monica Talarico Duailibi, Paulo Oliveira Martins, Jennifer Adriane Dos Santos, Silvio Eduardo Duailibi
AIM: The use of dexamethasone (DEX) in mesenchymal cell culture induces osteoblastic differentiation and, consequently, formation of mineralized tissues. Tissue engineering proposes the development of therapeutic strategies aimed at structural and functional regeneration of biological tissues. In this sense, cell characterization in vitro is critical to ensure the development of such techniques. Our objective was to evaluate the osteoinductive effect of DEX administered as a preoperative medication in primary cell culture of human dental pulp stem cell...
August 2017: Future Science OA
https://www.readbyqxmd.com/read/28883726/doxorubicin-loaded-redox-responsive-micelles-based-on-dextran-and-indomethacin-for-resistant-breast-cancer
#19
Yunfang Zhou, Shuanghu Wang, Xuhua Ying, Yifan Wang, Peiwu Geng, Aiping Deng, Zhihong Yu
Multidrug resistance (MDR) against chemotherapeutic agents has become one of the major obstacles to successful cancer therapy and MDR-associated proteins (MRPs)-mediated drug efflux is the key factor for MDR. In this study, a redox-responsive polymer based on dextran (DEX) and indomethacin (IND), which could reduce MRPs-mediated efflux of chemotherapeutics, was synthesized, and the obtained polymer could spontaneously form stable micelles with well-defined core-shell structure and a uniform size distribution with an average diameter of 50 nm and effectively encapsulate doxorubicin (DOX); the micelles contain a disulfide bridge (cystamine, SS) between IND and DEX (DEX-SS-IND)...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28879318/dexmedetomidine-attenuates-h2o2-induced-cell-death-in-human-osteoblasts
#20
Ji-Young Yoon, Jeong-Hoon Park, Eun-Jung Kim, Bong-Soo Park, Ji-Uk Yoon, Sang-Wook Shin, Do-Wan Kim
BACKGROUND: Reactive oxygen species play critical roles in homeostasis and cell signaling. Dexmedetomidine, a specific agonist of the α2-adrenoceptor, has been commonly used for sedation, and it has been reported to have a protective effect against oxidative stress. In this study, we investigated whether dexmedetomidine has a protective effect against H2O2-induced oxidative stress and the mechanism of H2O2-induced cell death in normal human fetal osteoblast (hFOB) cells. METHODS: Cells were divided into three groups: control group-cells were incubated in normoxia without dexmedetomidine, hydrogen peroxide (H2O2) group-cells were exposed to H2O2 (200 µM) for 2 h, and Dex/H2O2 group-cells were pretreated with dexmedetomidine (5 µM) for 2 h then exposed to H2O2 (200 µM) for 2 h...
December 2016: J Dent Anesth Pain Med
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