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Canadian Journal of Physiology and Pharmacology

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https://www.readbyqxmd.com/read/28231436/myocardial-homing-of-mesenchymal-stem-cells-following-intrapericardial-application-and-amplification-by-inflammation-an-experimental-pilot-study
#1
Nina Jung, Heinz Rupp, Rembert Koczulla, Claus Vogelmeier, Peter Alter
Recent studies demonstrated potential effects of stem cells on cardiac function in heart failure. However, influences of the technique of application remained undetermined. In the present study, the pericardial sac was used as depot for fluorescent-labeled mesenchymal stem cells in rats. To evaluate influences of inflammation on cell homing, a sterile pericarditis was induced by talc. It is shown that intrapericardial stem cells application is sufficient to provide myocardial penetration. The extent of homing was amplified by inflammation in a talc-induced pericarditis...
February 23, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28226224/different-electrophysiological-effects-of-the-levo-and-dextrorotatory-isomers-of-mexiletine-in-isolated-rabbit-cardiac-muscle
#2
Zsolt Gurabi, Bence Patocskai, Balázs Györe, László Virág, Péter Mátyus, Julius Gy Papp, András Varró, Istvan Koncz
Racemic mexiletine is a widely used antiarrhythmic agent which blocks sodium channels. The effects of R-(-) and S-(+) mexiletine stereoisomers on maximum rate of depolarization (Vmax), conduction time and repolarization have not yet been investigated in isolated cardiac preparations. We studied the effect of the R-(-) and S-(+) mexiletine on rabbit cardiac action potential parameters by using the conventional microelectrode technique. Both enantiomers at 20 µM of therapeutically and experimentally relevant concentration, significantly depressed the Vmax at fast heart rates (BCLs 300 - 700 ms)...
February 22, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28187269/excessive-consumption-of-fructose-causes-cardiometabolic-dysfunctions-through-oxidative-stress-and-inflammation
#3
Nathalia Bernardes, Prathapan Ayyappan, Katia De Angelis, Ashim Bagchi, Gauri Akolkar, Danielle da Silva Dias, Adriane Bello-Klein, Pawan K Singal
A rapid rise in obesity as well as physical inactivity in industrialized countries is associated with fructose consumption-mediated metabolic syndrome having a strong association with cardiovascular disease. Although insulin resistance is thought to be at the core, visceral obesity, hypertension and hypertriglyceridemia are also considered important components of this metabolic disorder. In addition, various other abnormalities such as inflammation, oxidative stress and elevated levels of uric acid are also part of this syndrome...
February 10, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28187266/short-term-effects-of-troxerutin-vitamin-p4-on-muscle-fatigue-and-genes-expression-of-bcl-2-and-bax-in-the-hepatic-tissue-of-rats
#4
Mohammad Zamanian, Ali Shamsizadeh, Ali Esmaeili Nadimi, Mohammad R Hajizadeh, Fatemeh Allatavakoli, Mohammad R Rahmani, Ayat Kaeidi, Hamid R Safari Khalegh, Mohammad Allahtavakoli
In the current study, the effects of troxerutin (TXER) on muscle fatigue and genes expression of Bcl-2 and Bax in the hepatic tissue of rats was investigated. 40 male Wistar rats were randomly divided into four groups and designated as control and TXER treatment at 75 (TXER75), 150 (TXER150), and 300 mg/kg/day (TXER300). The treated groups and control group received TXER and water orally for 7 days. After an exhaustive swimming test on the 7th day, all animals were sacrificed immediately and several biochemical parameters related to fatigue and genes expression of Bcl-2 and Bax in the hepatic tissue were measured...
February 10, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28187265/gastroprotective-effects-of-montelukast-and-nigella-sativa-oil-against-corticosteroids-induced-gastric-damage-much-more-than-antiasthmatic-drugs
#5
Fatma Hassan Rizk, Marwa Awad Ibrahim, Marwa Abd-Elsalam, Nema Ali Soliman, Sherief Abd-Elsalam
Corticosteroids are used to treat variety of diseases like bronchial asthma. However, long term corticosteroids have a gastric ulcerogenic potential. Montelukast (MTK) and nigella sativa oil (NSO) are used in treatment of bronchial asthma. Previous studies showed that MTK and NSO had gastroprotective effects in other models of gastric ulcer. The present study assesses synergistic gastroprotective effects of both drugs in dexamethasone (DXM)-induced gastric damage. 50 male rats were divided into 5 groups; normal control (I), DXM group (II), MTK+DXM group (III), NSO+DXM group (IV), MTK+NSO+DXM group (V)...
February 10, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28187263/tetrahydroxystilbene-glucoside-inhibits-%C3%AE-synuclein-aggregation-and-apoptosis-in-a53t-%C3%AE-synuclein-transfected-cells-exposed-to-mpp-sup-sup
#6
Ruyi Zhang, Fangling Sun, Lan Zhang, Xuejing Sun, Lin Li
Increasing evidence has solidified the involvement of α-synuclein (α-Syn) and neurotoxins in the pathogenesis of Parkinson's disease (PD), suggesting a combination of genetic and environmental influences. 2,3,5,4'-Tetrahydroxystilbene -2-O-β-D-glucoside (TSG) is one of the main active components extracted from Polygonum multiflorum. The purpose of the present study was to investigate the effects of TSG on α-Syn aggregation, mitochondrial dysfunction, oxidative stress and apoptosis in vitro. A53T mutant α-synuclein-transfected cells (A53T AS cells) plus MPP+<sup></sup> exposure were used as a complex cell model of PD...
February 10, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177662/esculetin-induces-apoptosis-of-smmc-7721-cells-through-igf-1-pi3k-akt-mediated-mitochondrial-pathways
#7
Juan Li, Shuang Li, Xiuli Wang, Hongxin Wang
Esculetin (6,7-dihydroxycoumarin) is a coumarin derivative extracted from natural plants and has been reported to have anti-cancer activity. However, the mechanism by which esculetin prevents human hepatic cancer cell growth is still largely unknown. In this study, we investigated the effect of esculetin on human hepatocellular carcinoma (HCC) SMMC-7721 cells and explored the cell signal mechanism. Our data indicated that esculetin induced apoptosis in SMMC-7721 cells, which were supported by DAPI staining and Annexin V/PI staining...
February 3, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177661/anti-inflammatory-effects-of-dabrafenib-in-vitro-and-in-vivo
#8
In-Chul Lee, Jongdoo Kim, Jong-Sup Bae
The screening of bioactive compound libraries can be an effective approach for repositioning FDA-approved drugs or discovering new treatments for human diseases (drug repositioning). Drug repositioning refers to the development of existing drugs for new indications. Dabrafenib (DAB) is a B-Raf inhibitor and initially used for the treatment of metastatic melanoma therapy. Here, we tested the possible use of DAB in the treatment of lipopolysaccharide (LPS)-mediated vascular inflammatory responses. The anti-inflammatory activities of DAB were determined by measuring permeability, neutrophils adhesion and migration, and activation of pro-inflammatory proteins in LPS-activated human umbilical vein endothelial cells (HUVECs) and mice...
February 3, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177660/carvacrol-attenuates-cyclophosphamide-induced-oxidative-stress-in-rat-kidney
#9
Sibel Gunes, Adnan Ayhanci, Varol Sahinturk, Diler Us Altay, Ruhi Uyar
Cyclophosphamide (CP) is an antineoplastic drug inducing kidney damage via producing oxidative stress. Carvacrol (CAR) has antioxidative effect and we postulated that it can be protective against CP-induced nephrotoxicity. Six groups (n=7) of rats (control, 100 mg/kg CP, CP+5 and CP+10 mg/kg CAR and 5 and 10 mg/kg CAR) were injected intraperitoneally. Serum malondialdehyde (MDA), glutathione (GSH), superoxide dismutase (SOD), catalase (CAT), creatinine (CRE), total antioxidant capacity (TAC) and total oxidant state (TOS) were measured, and oxidative stress indexes (OSI) were calculated...
February 3, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177659/effects-of-ferulic-acid-on-oxidative-stress-heat-shock-protein-70-connexin-43-and-monoamines-in-hippocampus-of-pentylenetetrazole-kindled-rats
#10
Abdelaziz M Hussein, Khalid M Abbas, Osama A Abulseoud, Elhussainy Mohamed Abouelez Elhussainy
The present study investigated the effects of ferulic acid on pentylenetetrazole (PTZ)-induced seizures, oxidative stress markers (malondialdhyde (MDA), catalase (CAT) and reduced glutathione (GSH)), connexin (Cx) 43, heat shock protein (Hsp) 70 and monoamines (serotonin (5HT) and norepinephrine (NE) levels in a rat model of PTZ-induced kindling. Sixty Sprague Dawley rats were divided into 5 equal groups, a) normal group, b) FA group: normal rats received FA at a dose of 40 mg/kg daily, c) PTZ group: rats received PTZ at a dose of 50 mg/kg i...
February 3, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177668/chimaphilin-inhibits-human-osteosarcoma-cells-invasion-and-metastasis-through-suppressing-the-tgf-%C3%AE-1-induced-epithelial-to-mesenchymal-transition-markers-via-pi-3k-akt-erk1-2-and-smad-signaling-pathways
#11
Feng Dong, Tingting Liu, Hao Jin, Wenbo Wang
Epithelial-to-mesenchymal transition is a cellular process associated with cancer invasion and metastasis. However, the anti-metastatic effects of chimaphilin remain elusive. In this study, we attempted to investigate the potential use of chimaphilin as an inhibitor of TGF-β1-induced epithelial-to-mesenchymal in U2OS cells. We found that TGF-β1 induced epithelial-to-mesenchymal to promote U2OS cells invasion and metastasis. Western blotting demonstrated that chimaphilin inhibited U2OS cells invasion and migration, increased the expression of the epithelial phenotype marker E-cadherin, repressed the expression of the mesenchymal phenotype marker Vimentin, as well as decreased the level of epithelial-to-mesenchymal-inducing transcription factors Snail1 and Slug during the initiation of TGF-β1-induced epithelial-to-mesenchymal...
January 29, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177667/ursolic-acid-suppresses-leptin-induced-cell-proliferation-in-rat-vascular-smooth-muscle-cells
#12
Ya-Mei Yu, Chiang-Chin Tsai, Yu-Wen Tzeng, Weng-Cheng Chang, Su-Yin Chiang, Ming-Fen Lee
Accumulating lines of evidence indicate that high leptin levels are associated with adverse cardiovascular health in obese individuals. Proatherogenic effects of leptin include endothelial cell activation, vascular smooth muscle cell proliferation and migration. Ursolic acid (UA) has been reported to exhibit multiple biological effects including antioxidant and anti-inflammatory properties. In this study, we investigated the effect of UA on leptin-induced biological responses in rat vascular smooth muscle cells (VSMCs)...
January 29, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177666/poly-adp-ribose-polymerase-1-parp-1-in-chinese-patients-with-graves-disease-and-graves-ophthalmopathy
#13
Tong Wu, Dong-Run Tang, Liang Zhao, Feng-Yuan Sun
We aimed to evaluate the genetic variation of poly (ADP-ribose) polymerase-1 (PARP-1) as risk factor in development of Graves' disease (GD) and Graves Ophthalmopathy (GO) among Chinese individuals. Patients with confirmed diagnosis of GD or healthy individuals with no clinical symptoms of hyperthyroiditis were enrolled at department of Ophthalmology, Tianjin First Center Hospital, China. Genetic polymorphism was studied in plasma DNA samples of subjects by polymererase chain reaction of restriction fragment length polymorphism to confirm test our hypothesis...
January 29, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177665/possible-involvement-of-atp-sensitive-potassium-channels-in-the-antidepressant-like-effects-of-gabapentin-in-mice-forced-swimming-test
#14
Sattar Ostadhadi, Reyhaneh Akbarian, Abbas Norouzi-Javidan, Vahid Nikoui, Samira Zolfaghari, Mohsen Chamanara, Ahmad-Reza Dehpour
Gabapentin as an anticonvulsant drug also has beneficial effects in treatment of depression. Previously we showed that acute administration of gabapentin produced an antidepressant-like effect in the mouse forced swimming test (FST) by a mechanism involves the inhibition of the nitric oxide (NO). Considering the involvement of NO in adenosine triphosphate (ATP)-sensitive potassium channels (KATP), in the present study we investigated the involvement of KATP channels in antidepressant-like effect of gabapentin...
January 29, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177664/trimetazidine-potentiates-the-antiepileptic-activity-and-ameliorates-the-metabolic-changes-associated-with-pentylentetrazole-kindling-in-rats-treated-with-valproic-acid
#15
Amina Ahmed Sedky, Osama Mahmod Elserafy, Olfat A Hassan, Hala Salah Abdel Kawy, Amany Hasanin, Mona Hussein Raafat
Oxidative stress is implicated in epileptogenesis as well as in the metabolic changes associated with increased risk of atherosclerotic vascular disease in epilepsy. The present work investigated the impact of the antioxidants trimetazidine (TMZ) on the antiepileptic activity of valproic acid (VAP) and on the metabolic and histological changes in hippocampal, aortic and hepatic tissues associated with epilepsy and/or VPA. Rats were divided into: Non-Pentylentetrazole (PTZ) group; subdivided into: control and VPA treated groups, PTZ-treated group subdivided into: PTZ, PTZ/VPA, PTZ/TMZ, PTZ/VPA+TMZ groups...
January 29, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177663/hypothermia-induced-by-inhibition-of-fatty-acid-metabolism-in-anesthetized-rats-contributions-of-the-forebrain-and-vagal-afferents
#16
T Osaka
2-Mercaptoacetate (MA) is an antimetabolic drug that inhibits the utilization of fatty acids as an energy source. The intravenous injection of MA (1.2 mmol kg-1) elicited an increase in tail skin temperature and a decrease in body core temperature in urethane-chloralose-anesthetized, neuromuscularly blocked, artificially ventilated rats, though administration of the same amount of NaCl did not. The respiratory exchange ratio was significantly higher after administration of MA than that after the saline treatment...
January 29, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177669/beta-sitosterol-up-regulated-paraoxonase-1-via-peroxisome-proliferator-activated-receptor-%C3%AE-in-irradiated-rats
#17
Enas Moustafa, Noura Magdy Thabet
This study was designed to evaluate the effect of Beta-sitosterol (BS) on the of peroxisome proliferator-activated receptor gamma (PPAR-γ) gene expression role in the activity of PON-1 enzyme in oxidative stress status of irradiated rats. Animals were exposed to whole body γ-radiation single dose 6Gy and received BS dose (40 mg•(kg body mass) -1•day -1, orally). In liver tissue, gene expression of PPAR-γ ligand was determined. Oxidative stress marker (malonyldialdehyde, MDA) and antioxidant enzymes activities (Superoxide dismutase; SOD Catalase; CAT, PON-1 and arylesterase; ARE) were assayed in serum and liver tissue...
January 24, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28118732/relationship-between-pdk1-and-contraction-in-carotid-arteries-in-goto-kakizaki-rat-a-spontaneous-type-2-diabetic-animal-model
#18
Shun Watanabe, Takayuki Matsumoto, Kumiko Taguchi, Tsuneo Kobayashi
We studied the relationship between 3-phosphoinositide-dependent protein kinase 1 (PDK1) and contractions induced by serotonin, phenylephrine, and thromboxane A2 mimetic (U46619) in the presence of nitric oxide synthase inhibitor in the carotid arteries of Goto-Kakizaki (GK) rats, a spontaneous type 2 diabetic model, in the chronic stage of disease. Serotonin-induced contraction was greater in the GK rats than in the control Wistar rats. A specific PDK1 inhibitor (GSK2334470) decreased the serotonin-induced contraction in the GK rats but not in the Wistar rats, and the difference in such contraction was abolished with this treatment...
January 24, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177673/interleukin-1beta-suppresses-the-ventilatory-hypoxic-response-in-rats-via-prostaglandin-dependent-pathways
#19
Nina Pavlovna Aleksandrova, Galina Anatol'yevna Danilova, Vjacheslav Georgievich Aleksandrov
We investigated the effect of the major inflammatory cytokine interleukin-1beta (IL-1β) on the ventilatory response to hypoxia. The goal was to test the hypothesis that IL-1β impairs the hypoxic ventilatory response in vivo by indirectly inhibiting respiratory neurons in the brainstem via prostaglandins. Thus, IL-1β was delivered by cerebroventricular injection, and the ventilatory hypoxic response was assessed in anesthetized, spontaneously breathing rats pretreated with or without diclofenac, a nonspecific inhibitor of prostaglandin synthesis...
January 22, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28177672/a-reappraisal-of-the-6-o-desmethylnaproxen-sulfating-activity-of-the-human-cytosolic-sulfotransferases
#20
Fatemah Alherz, Daniyah A Almarghalani, Noor A Hussein, Katsuhisa Kurogi, Ming-Cheh Liu
In this study, we aimed to obtain a comprehensive account of the human cytosolic sulfotransferases (SULTs) that are capable of sulfating 6-<i>O</i>-desmethylnaproxen (<i>O</i>-DMN), a major metabolite of naproxen. Of the 13 known human SULTs tested, seven, SULT1A1, SULT1A2, SULT1A3, SULT1B1, SULT1C2, SULT1C4, and SULT1E1, displayed <i>O</i>-DMN-sulfating activity, when analyzed using an elevated substrate concentration (500 μM) together with 14 μM of the sulfate donor, 3'-phosphoadenosine-5'-phosphosulfate (PAPS)...
January 22, 2017: Canadian Journal of Physiology and Pharmacology
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