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Physiological Research

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https://www.readbyqxmd.com/read/29750888/adiponectin-enhances-biological-functions-of-vascular-endothelial-progenitor-cells-through-the-mtor-stat3-signaling-pathway
#1
Xiaoying Dong, Xia Yan, Wei Zhang, Shengqiu Tang
Adiponectin (APN), an adipose tissue-excreted adipokine, plays protective roles in metabolic and cardiovascular diseases. In this study, the effects and mechanisms of APN on biological functions of rat vascular endothelial progenitor cells (VEPCs) were investigated in vitro. After administrating APN in rat VEPCs, the proliferation was measured by methyl thiazolyl tetrazolium (MTT) method, the apoptotic rate was test by Flow cytometry assay, mRNA expression of B-cell lymphoma-2 (Bcl-2) and vascular endothelial growth factor (VEGF) was determined by Real-time reverse transcriptase polymerase chain reaction (RT-PCR), and protein expression of mechanistic target of rapamycin (mTOR), signal transducer and activator of transcription 3 (STAT3) and phospho-STAT3 (pSTAT3) was analyzed by Western Blot...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750887/the-effects-of-acute-hypoxia-on-tissue-oxygenation-and-circulating-alarmins-in-healthy-adults
#2
C J Boos, C M Lamb, M Midwinter, A Mellor, D R Woods, M Howley, T Stansfield, M Foster, J P O'hara
The binding of high-mobility group box-1 (HMGB-1) to the membrane receptor for advanced glycation end-products (mRAGE) is a key early mediator of non-infectious inflammation and its triggers include ischaemia/hypoxia. The effects of acute hypoxia on soluble RAGE (sRAGE) are unknown. Fourteen healthy adults (50% women; 26.6+/-3.8 years) were assessed at baseline normoxia (T0), followed by four time-points (T90, 95, 100 and 180 minutes) over three hours of continuous normobaric hypoxia (NH, 4450m equivalent) and again 60 minutes after return to normoxia (T240)...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750886/co-administration-of-conjugated-linoleic-acid-and-rosiglitazone-increases-atherogenic-co-efficicient-and-alters-isoprenaline-induced-vasodilatation-in-rats-fed-high-fat-diet
#3
B K Chai, Y S Lau, B J Loong, M M Rais, K N Ting, D M Dharmani, M S Kumar
The cis(c)-9, trans(t)-11 (c9,t11) and t10,c12 isomers of conjugated linoleic acid (CLA) have been reported as agonists of peroxisome proliferator-activated receptor (PPAR) and beneficial in lipidemia and glycaemia. However, it is unclear whether CLA isomers enhance or antagonize effects of conventional drugs targeting PPAR. Male Sprague-Dawley rats were fed high fat diet (HFD) for 8 weeks and treated without or with CLA, rosiglitazone or both for 4 weeks. Oral glucose tolerance and surrogate markers of insulin resistance were not significantly different for all treatments compared to untreated normal diet (ND) or HFD group, except lipoprotein levels...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750885/severe-acute-heart-failure-experimental-model-with-very-low-mortality
#4
S Lacko, M Mlček, P Hála, M Popková, D Janák, M Hrachovina, J Kudlička, V Hrachovina, P Ošťádal, O Kittnar
The growth in the experimental research of facilities to support extracorporeal circulation requires the further development of models of acute heart failure that can be well controlled and reproduced. Two types of acute heart failure were examined in domestic pigs (Sus scrofa domestica): a hypoxic model (n = 5) with continuous perfusion of the left coronary artery by hypoxic deoxygenated blood and ischemic model (n = 9) with proximal closure of the left coronary artery and controlled hypoperfusion behind the closure...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750884/nutritional-intervention-as-an-essential-part-of-multiple-sclerosis-treatment
#5
A Penesová, Z Dean, B Kollár, A Havranová, R Imrich, M Vlček, Ž Rádiková
Multiple sclerosis (MS) is a chronic inflammatory and demyelinating disease of the central nervous system. In addition to the genetic, epigenetic and immunological components, various other factors e.g. unhealthy dietary habits play a role in the MS pathogenesis. Dietary intervention is a highly appealing approach, as it presents a simple and relatively low risk method to potentially improve outcomes in patients with brain disorders in order to achieve remission and improvement of clinical status, well-being and life expectancy of patients with MS...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750883/involvement-of-the-periaqueductal-gray-in-the-descending-antinociceptive-effect-induced-by-the-central-nucleus-of-amygdala
#6
N Bourbia, A Pertovaara
Here we studied whether descending control of mechanical nociception by glutamate in the central nucleus of the amygdala (CeA) of healthy control animals is induced by amygdaloid NMDA receptors and relayed through the midbrain periaqueductal gray (PAG). Mechanical nociception in the hind paws was assessed in rats with chronic guide cannulae for glutamate administration in the right CeA and for inducing local anesthesia in the PAG. In a separate electrophysiological study, ON-like PAG neurons giving an excitatory response to noxious pinch of the tail were recorded in anesthetized rats following glutamate administration into the CeA...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750882/occurrence-of-serum-antibodies-against-wheat-alpha-amylase-inhibitor-0-19-in-celiac-disease
#7
D Sánchez, S Štěpánová-Honzová, M Hospodková, I Hoffmanová, V Hábová, P Halada, H Tlaskalová-Hogenová, L Tučková
The alcohol-soluble fraction of wheat gluten (gliadins) induces in genetically susceptible individuals immunologically mediated celiac disease (CLD). However, gliadins and related cereal proteins are not unique foodstuff targets of CLD patients´ immune system. Non-gluten wheat alpha-amylase inhibitor 0.19 (AAI 0.19) has been found to be capable of activating human monocyte-derived dendritic cells and inducing pro-inflammatory status in intestinal mucosa of patients with celiac disease (CLD). The possible contribution of this reactivity in incomplete remission of CLD patients on a gluten-free diet (GFD) is matter of contention...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750881/pathophysiological-characteristics-of-non-alcoholic-steatohepatitis-like-changes-in-cholesterol-loaded-type-2-diabetic-rats
#8
Y Toriniwa, M Muramatsu, Y Ishii, E Riya, K Miyajima, S Ohshida, K Kitatani, S Takekoshi, T Matsui, S Kume, T Yamada, T Ohta
Spontaneously Diabetic Torii (SDT) fatty rats, a new obese diabetic model, reportedly presented with features of non-alcoholic steatohepatitis (NASH) after 32 weeks of age. We tried to accelerate the onset of NASH in SDT fatty rats using dietary cholesterol loading and noticed changes in the blood choline level which is expected to be a NASH biomarker. Body weight and biochemical parameters were measured from 8 to 24 weeks of age. At 16 or 24 weeks, pathophysiological analysis of the livers were performed, hepatic lipids, lipid peroxides, and the expression of mRNA related to triglyceride (TG) synthesis, inflammation, and fibrosis were evaluated...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750880/akt-enos-and-mapk-signaling-pathways-mediated-the-phenotypic-switching-of-thoracic-aorta-vascular-smooth-muscle-cells-in-aging-hypertensive-rats
#9
Lin Zhang, Zhaoxia Xu, Ying Wu, Jingwen Liao, Fanxing Zeng, Lijun Shi
Considerable evidence demonstrates that phenotypic switching of vascular smooth muscle cells (VSMCs) is influenced by aging and hypertension. During phenotypic switching, VSMCs undergo a switch to a proliferative and migratory phenotype, with this switch being a common pathology in cardiovascular diseases. The aim of this study was to explore the joint influence of age and hypertension on thoracic aortic smooth muscle phenotypic switching and the balance of Akt and mitogen-activated protein kinase (MAPK) signaling during this switch...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750879/dha-upregulates-fads2-expression-in-primary-cortical-astrocytes-exposed-to-vitamin-a
#10
B Dziedzic, D Bewicz-Binkowska, E Zgorzynska, D Stulczewski, L Wieteska, B Kaza, A Walczewska
The fads2 gene encoding delta6-desaturase, the rate-limiting enzyme in the LCPUFA biosynthesis is expressed in astrocytes. Dietary fatty acids, which cross the blood-brain barrier may regulate the transcription of lipogenic enzymes through activation of transcription factors such as peroxisome proliferator-activated receptors (PPARs). The PPARs form the transcription complex with retinoid X receptors (RXRs) that are activated by 9-cis retinol, a metabolite of vitamin A (VA). The study examines whether challenge of astrocytes with VA, prior 24-hour treatment with palmitic acid (PA), alpha-linolenic acid (ALA) or docosahexaenoic acid (DHA) has the effect on the FADS2 expression...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750878/perfusion-scintigraphy-in-the-assessment-of-autologous-cell-therapy-in-diabetic-patients-with-critical-limb-ischemia
#11
A Nemcova, A Jirkovska, M Dubsky, R Bem, V Fejfarova, V Woskova, A Pysna, M Buncova
Perfusion scintigraphy with technetium-99-methoxy-isobutyl-isonitrile ((99m)Tc-MIBI) is often used for assessing myocardial function but the number of studies concerning lower limb perfusion is limited. The aim of our study was to assess whether (99m)Tc-MIBI was an eligible method for evaluation of the effect of cell therapy on critical limb ischemia (CLI) in diabetic patients. (99m)Tc-MIBI of calf muscles was performed before and 3 months after autologous cell therapy (ACT) in 24 diabetic patients with CLI...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750877/respiratory-induced-hemodynamic-changes-measured-by-whole-body-multichannel-impedance-plethysmography
#12
P Langer, P Jurák, V Vondra, J Halámek, M Mešťaník, I Tonhajzerová, I Viščor, L Soukup, M Matejkova, E Závodná, P Leinveber
The cardiovascular system is described by parameters including blood flow, blood distribution, blood pressure, heart rate and pulse wave velocity. Dynamic changes and mutual interactions of these parameters are important for understanding the physiological mechanisms in the cardiovascular system. The main objective of this study is to introduce a new technique based on parallel continuous bioimpedance measurements on different parts of the body along with continuous blood pressure, ECG and heart sound measurement during deep and spontaneous breathing to describe interactions of cardiovascular parameters...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750876/evaluation-of-molecular-changes-of-distal-organs-after-small-bowel-transplantation-experimental-study
#13
P Urban, M Rabajdová, Š Feterik, G Bódy, T Granda, M Mareková, J Veselá
The ischemia and reperfusion of a jejunal graft during transplantation triggers the stress of endoplasmic reticulum; thus inducing the synthesis of pro-inflammatory cytokines. Spreading of these signals stimulate immunological reactions in distal tissues i.e. lung, liver and spleen. The aim of this study was to detect the molecular changes in liver and spleen induced by transplanted jejunal graft with one or six hours of reperfusion (group Tx1 and Tx6). Analysis of gene expression changes of inflammatory mediators (TNFalpha, IL-10) and specific chaperones (Gadd153, Grp78) derived from endoplasmic reticulum (ER) was done and compared to control group...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750875/ulinastatin-alleviates-neurological-deficiencies-evoked-by-transient-cerebral-ischemia-via-improving-autophagy-nrf-2-are-and-apoptosis-signals-in-hippocampus
#14
Xiao-Ming Jiang, Jing-Hai Hu, Lu-Lu Wang, Chi Ma, Xu Wang, Xiao-Liang Liu
Ulinastatin [or called as urinary trypsin inhibitor (UTI)] plays a role in regulating neurological deficits evoked by transient cerebral ischemia. However, the underlying mechanisms still need to be determined. The present study was to examine the effects of UTI on autophagy, Nrf2-ARE and apoptosis signal pathway in the hippocampus in the process of neurological functions after cerebral ischemia using a rat model of cardiac arrest (CA). CA was induced by asphyxia followed by cardiopulmonary resuscitation (CPR) in rats...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750874/hematological-findings-in-non-treated-and-gamma-irradiated-mice-deficient-for-mic-1-gdf15
#15
M Hofer, Z Hoferová, J Remšík, M Nováková, J Procházková, R Fedr, J Kohoutek, L Dušek, A Hampl, K Souček
Several members of the TGF-beta family are known to effectively regulate the fate of hematopoietic progenitor cells in a complex and context-dependent manner. Growth differentiation factor-15 (GDF15) is a divergent member of the TGF-beta family. This stress-induced cytokine has been proposed to possess immunomodulatory functions and its high expression is often associated with progression of a variety of pathological conditions. GDF15 is also induced by chemotherapy and irradiation. Very few fundamental studies have been published regarding the effect of GDF15 in hematopoiesis...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750873/the-effect-of-superoxide-dismutase-sod-enzyme-inhibition-on-renal-microcirculation-of-spontaneously-hypertensive-stroke-prone-shrsp-and-wistar-rats
#16
A F Ahmeda, M G Rae, L M Anweigi, M F Al Otaibi, A A Al-Masri, E J Johns
A significant factor in the development of hypertension may be excessive vasoconstriction within the renal medulla. This study therefore investigated the role of superoxide dismutase (SOD) in the regulation of renal medullary and cortical blood perfusion (MBP and CBP respectively) in both stroke-prone spontaneously hypertensive rats (SHRSP) and normotensive Wistar rats. CBP and MBP were measured before and after intra-renal infusion of the SOD inhibitor, diethyldithio-carbamic acid (DETC). Under basal conditions, mean arterial pressure was significantly greater in SHRSP than Wistar rats, but both MBP and heart rate (HR) were significantly lower in SHRSP relative to Wistar rats (P < 0...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29947545/antibodies-targeting-human-endothelin-1-receptors-reveal-different-conformational-states-in-cancer-cells
#17
A Herbet, N Costa, N Leventoux, A Mabondzo, J-Y Couraud, A Borrull, J-P Hugnot, D Boquet
The endothelin axis (endothelins and their receptors) is strongly involved in physiological and pathological processes. ET-1 plays a crucial role in particular in tumor diseases. Endothelin-1 receptors (ET(A) and ET(B)) are deregulated and overexpressed in several tumors such as melanoma and glioma. We studied the binding of 24 monoclonal antibodies directed against human ET(B) receptors (hET(B)) to different melanoma cell lines. Few of these mAbs bound to all the melanoma cell lines. One of them, rendomab B49, bound to ET(B) receptors expressed at the surface of human glioma stem cells...
June 27, 2018: Physiological Research
https://www.readbyqxmd.com/read/29947544/temporal-changes-of-the-endothelin-system-in-human-cytotrophoblasts-during-the-first-trimester-of-pregnancy
#18
A Majali-Martinez, S Barth, U Lang, G Desoye, M Cervar-Zivkovic
The first trimester of pregnancy is characterized by continuous proliferation, invasion and differentiation of cytotrophoblasts. These processes are precisely controlled both, in space and time by molecules such as endothelin-1 (ET-1). ET-1 is expressed in human first trimester trophoblast and is known to stimulate cytotrophoblast proliferation through endothelin A and B receptor subtypes (ET(A) and ET(B)), and cytotrophoblast invasion through ET(B). However, temporal changes of the ET system during the first trimester of pregnancy have not been previously studied...
June 27, 2018: Physiological Research
https://www.readbyqxmd.com/read/29947543/endothelin-1-inhibition-improves-the-mbdnf-probdnf-ratio-in-endothelial-cells-and-ht22-neurons-under-high-glucose-palmitate-growth-conditions
#19
R Ward, Y Abdul, A Ergul
Diabetes increases the risk and worsens the progression of cognitive impairment. The hippocampus is an important domain for learning and memory. We previously showed that endothelin-1 (ET-1) reduced diabetes-induced inflammation in hippocampal neurons, suggesting a neuroprotective effect. Given that neurons and endothelial cells within the neurovascular unit depend on each other for proper function, we investigated the effect of ET-1 on brain-derived neurotrophic factor (BDNF) synthesis, a key neurotrophin and prosurvival factor, in neuronal (HT22 hippocampal neurons) and brain microvascular endothelial (BMEC-5i) cells under normal and diabetes-mimicking (high glucose plus palmitate) conditions...
June 27, 2018: Physiological Research
https://www.readbyqxmd.com/read/29947542/lipopolysaccharide-induced-necroptosis-of-brain-microvascular-endothelial-cells-can-be-prevented-by-inhibition-of-endothelin-receptors
#20
Y Abdul, R Ward, G Dong, A Ergul
Over activation of the endothelin-1 (ET-1) system in disease states contributes to endothelial dysfunction. On the other hand, ET-1 promotes proliferation and survival of endothelial cells. Regulation of programmed cell death (PCD) pathways is critical for cell survival. Recently discovered necroptosis (regulated necrosis) is a pathological PCD mechanism mediated by the activation of toll like receptor 4 (TLR4), which also happens to stimulate ET-1 production in dendritic cells. To establish the effect of ET-1 on PCD and survival of human brain microvascular endothelial cells (BMVECs) under control and inflammatory conditions, BMVECs were treated with ET-1 (10 nM, 100 nM and 1 microM) or lipopolysaccharide (LPS, 100 ng/ml)...
June 27, 2018: Physiological Research
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