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https://www.readbyqxmd.com/read/29332293/measurement-of-cyclic-gmp-during-plant-hypersensitive-disease-resistance-response
#1
Jian Chen, Diana Bellin, Elodie Vandelle
Cyclic guanosine-3',5'-monophosphate (cGMP) is recognized as an important second messenger in plants, mediating intracellular signal in important physiological processes, including the hypersensitive disease resistance response induced by avirulent pathogens. In this context, the analysis of cGMP levels in infected plants requires an accurate and specific detection method allowing its quantification. Here, we describe an assay based on the Alphascreen technology, developed for animal cells and further adapted and optimized for the detection of cGMP in plants...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29330066/regulation-of-vascular-tone-homeostasis-by-no-and-h2s-implications-in-hypertension
#2
REVIEW
Sevda Gheibi, Sajad Jeddi, Khosrow Kashfi, Asghar Ghasemi
Nitric oxide (NO) and hydrogen sulfide (H2S) are two gasotransmitters that are produced in the vasculature and contribute to the regulation of vascular tone. NO and H2S are synthesized in both vascular smooth muscle and endothelial cells; NO functions primarily through the sGC/cGMP pathway, and H2S mainly through activation of the ATP-dependent potassium channels; both leading to relaxation of vascular smooth muscle cells. A deficit in the NO/H2S homeostasis is involved in the pathogenesis of various cardiovascular diseases, especially hypertension...
January 9, 2018: Biochemical Pharmacology
https://www.readbyqxmd.com/read/29325869/microglial-activation-and-the-nitric-oxide-cgmp-pkg-pathway-underlie-enhanced-neuronal-vulnerability-to-mitochondrial-dysfunction-in-experimental-multiple-sclerosis
#3
Andrea Mancini, Michela Tantucci, Petra Mazzocchetti, Antonio de Iure, Valentina Durante, Lara Macchioni, Carmela Giampà, Alessandra Alvino, Lorenzo Gaetani, Cinzia Costa, Alessandro Tozzi, Paolo Calabresi, Massimiliano Di Filippo
During multiple sclerosis (MS), a close link has been demonstrated to occur between inflammation and neuro-axonal degeneration, leading to the hypothesis that immune mechanisms may promote neurodegeneration, leading to irreversible disease progression. Energy deficits and inflammation-driven mitochondrial dysfunction seem to be involved in this process. In this work we investigated, by the use of striatal electrophysiological field-potential recordings, if the inflammatory process associated with experimental autoimmune encephalomyelitis (EAE) is able to influence neuronal vulnerability to the blockade of mitochondrial complex IV, a crucial component for mitochondrial activity responsible of about 90% of total cellular oxygen consumption...
January 8, 2018: Neurobiology of Disease
https://www.readbyqxmd.com/read/29319007/calpain-inhibition-improves-erectile-function-in-diabetic-mice-via-upregulating-endothelial-nitric-oxide-synthase-expression-and-reducing-apoptosis
#4
Hao Li, Li-Ping Chen, Tao Wang, Shao-Gang Wang, Ji-Hong Liu
Calpain activation contributes to hyperglycemia-induced endothelial dysfunction and apoptosis. This study was designed to investigate the role of calpain inhibition in improving diabetic erectile dysfunction (ED) in mice. Thirty-eight-week-old male C57BL/6J mice were divided into three groups: (1) nondiabetic control group, (2) diabetic mice + vehicle group, and (3) diabetic mice + MDL28170 (an inhibitor of calpain) group. Type 1 diabetes was induced by intraperitoneal injection of streptozotocin at 60 mg kg-1 body weight for 5 consecutive days...
January 9, 2018: Asian Journal of Andrology
https://www.readbyqxmd.com/read/29313212/hyperbaric-oxygen-attenuates-withdrawal-symptoms-by-regulating-monoaminergic-neurotransmitters-and-no-signaling-pathway-at-nucleus-accumbens-in-morphine-dependent-rats
#5
Chunxia Chen, Qiuping Fan, Zhihuan Nong, Wan Chen, Yaoxuan Li, Luying Huang, Daorong Feng, Xiaorong Pan, Shengyong Lan
In this study, we examined whether hyperbaric oxygen (HBO2) plays a detoxification role in withdrawal symptoms in a morphine-dependent rat model. The model was established through injections of morphine at increasing doses for 7 days. Withdrawal symptoms were induced by naloxone injection on the 8th day. The detoxification effect of HBO2 was evaluated using the withdrawal symptom scores, biochemical indices and neurotransmitters. Compared with the model group, HBO2 therapy significantly attenuated the withdrawal symptom scores, body weight loss and the level of norepinephrine level, whereas it increased the dopamine level and tyrosine hydroxylase expression in the nucleus accumbens...
January 8, 2018: Neurochemical Research
https://www.readbyqxmd.com/read/29311674/the-gating-mechanism-in-cyclic-nucleotide-gated-ion-channels
#6
Monica Mazzolini, Manuel Arcangeletti, Arin Marchesi, Luisa M R Napolitano, Debora Grosa, Sourav Maity, Claudio Anselmi, Vincent Torre
Cyclic nucleotide-gated (CNG) channels mediate transduction in several sensory neurons. These channels use the free energy of CNs' binding to open the pore, a process referred to as gating. CNG channels belong to the superfamily of voltage-gated channels, where the motion of the α-helix S6 controls gating in most of its members. To date, only the open, cGMP-bound, structure of a CNG channel has been determined at atomic resolution, which is inadequate to determine the molecular events underlying gating. By using electrophysiology, site-directed mutagenesis, chemical modification, and Single Molecule Force Spectroscopy, we demonstrate that opening of CNGA1 channels is initiated by the formation of salt bridges between residues in the C-linker and S5 helix...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29311252/pazopanib-induced-hypertension-in-patients-with-renal-cell-carcinoma-is-associated-with-low-urine-excretion-of-no-metabolites
#7
Anne Robdrup Tinning, Camilla Bengtsen, Niels Viggo Jensen, Lars Bastholt, Boye Lagerbon Jensen, Kirsten Madsen
Drugs targeting VEGF (vascular endothelial growth factor) are often associated with rapid development of hypertension by a yet not fully understood mechanism. VEGF is expressed in renal epithelial cells and stimulates NO production. In the renal medulla, inhibition of NO formation by local L-NAME or by impaired endothelin-1 leads to hypertension. The present study was designed to test the hypothesis that VEGF receptor inhibitor treatment leads to hypertension through decreased renal medullary formation of NO and endothelin-1...
January 8, 2018: Hypertension
https://www.readbyqxmd.com/read/29311148/protein-kinases-g-are-essential-downstream-mediators-of-the-antifibrotic-effects-of-sgc-stimulators
#8
Alexandru-Emil Matei, Christian Beyer, Andrea-Hermina Györfi, Alina Soare, Chih-Wei Chen, Clara Dees, Christina Bergmann, Andreas Ramming, Andreas Friebe, Franz Hofmann, Oliver Distler, Georg Schett, Jörg H W Distler
OBJECTIVES: Stimulators of soluble guanylate cyclase (sGC) are currently investigated in clinical trials for the treatment of fibrosis in systemic sclerosis (SSc). In this study, we aim to investigate the role of protein kinases G (PKG) as downstream mediators of sGC-cyclic guanosine monophosphate (cGMP) in SSc. METHODS: Mice with combined knockout of PKG1 and 2 were challenged with bleomycin and treated with the sGC stimulator BAY 41-2272. Fibroblasts were treated with BAY 41-2272 and with the PKG inhibitor KT 5823...
January 8, 2018: Annals of the Rheumatic Diseases
https://www.readbyqxmd.com/read/29304533/release-of-platelet-derived-sphingosine-1-phosphate-involves-multidrug-resistance-protein-4-mrp4-abcc4-and-is-inhibited-by-statins
#9
Katja Vogt, Shailaja Mahajan-Thakur, Robert Wolf, Susanne Bröderdorf, Conny Vogel, Andreas Böhm, Christoph A Ritter, Markus Gräler, Stefan Oswald, Andreas Greinacher, Heyo K Kroemer, Gabriele Jedlitschky, Bernhard H Rauch
Sphingosine-1-phosphate (S1P) is a potent lipid mediator released from activated platelets by an adenosine triphosphate (ATP)-dependent export mechanism. A candidate transport protein is the multidrug resistance protein 4 (MRP4/ABCC4), an ATP-dependent transporter highly expressed in platelets. Furthermore, several statins are known to affect platelet functions and exhibit antithrombotic properties. This study determines the involvement of MRP4 in the transport of S1P and a possible interference by statins...
January 2018: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/29304131/soluble-guanylate-cyclase-stimulation-reduces-oxidative-stress-in-experimental-chronic-obstructive-pulmonary-disease
#10
Tanja Paul, Anna Salazar-Degracia, Victor I Peinado, Olga Tura-Ceide, Isabel Blanco, Esther Barreiro, Joan A Barberà
OBJECTIVE: Soluble guanylate cyclase (sGC) is a key enzyme of the nitric oxide-cyclic guanosine 3',5'-monophosphate (NO-cGMP) signaling pathway, and its pharmacological stimulation has been shown to prevent the development of emphysema and pulmonary vascular remodeling in animal models of chronic obstructive pulmonary disease (COPD). The aim of this study was to evaluate the effects of sGC stimulation on oxidative stress in the plasma of guinea pigs chronically exposed to cigarette smoke (CS)...
2018: PloS One
https://www.readbyqxmd.com/read/29301852/potein-kinase-g-activation-reverses-oxidative-stress-and-restores-osteoblast-function-and-bone-formation-in-male-mice-with-type-1-diabetes
#11
Hema Kalyanaraman, Gerburg Schwaerzer, Ghania Ramdani, Francine Castillo, Brian T Scott, Wolfgang Dillmann, Robert L Sah, Darren E Casteel, Renate B Pilz
Bone loss and fractures are under-recognized complications of type 1 diabetes, and are primarily due to impaired bone formation by osteoblasts. The mechanisms leading to osteoblast dysfunction in diabetes are incompletely understood, but insulin deficiency, poor glycemic control, and hyperglycemia-induced oxidative stress likely contribute. Here we show that insulin promotes osteoblast proliferation and survival via the nitric oxide (NO)/cGMP/protein kinase G (PKG) signal transduction pathway, and that PKG stimulation of Akt provides a positive feedback loop...
January 4, 2018: Diabetes
https://www.readbyqxmd.com/read/29301746/cyclic-gmp-elevating-agents-suppress-polyposis-in-apc-min-mice-by-targeting-the-preneoplastic-epithelium
#12
Sarah K Sharman, Bianca N Islam, Yali Hou, Nagendra Singh, Franklin G Berger, Subbaramiah Sridhar, Wonsuk Yoo, Darren D Browning
The cGMP signaling axis has been implicated in the suppression of intestinal cancers but the inhibitory mechanism and the extent to which this pathway can be targeted remains poorly understood. The present study has tested the effect of cGMP-elevating agents on tumorigenesis in the ApcMin/+ mouse model of intestinal cancer. Treatment of ApcMin/+ mice with the receptor guanylyl-cyclase C (GCC) agonist linaclotide, or the phosphodiesterase-5 (PDE5) inhibitor sildenafil, significantly reduced the number of polyps per mouse (67% and 50% respectively)...
January 4, 2018: Cancer Prevention Research
https://www.readbyqxmd.com/read/29300939/cgmp-pkg-i-pathway-mediated-glut1-4-regulation-by-no-nitric-oxide-in-female-rat-granulosa-cells
#13
Ye Tian, Dai Heng, Kaili Xu, Wenbo Liu, Xuechun Weng, Xusong Hu, Cheng Zhang
Nitric oxide (NO) is a multifunctional gaseous molecule that plays important roles in mammalian reproductive functions including follicular growth and development. Although our previous study showed that NO mediated 3,5,3'-triiodothyronine (T3) and follicle-stimulating hormone (FSH)-induced granulosa cell development via upregulation of GLUT1 (glucose transporter protein ) and GLUT4 in granulosa cells, little is known about the precise mechanisms regulating ovarian development via glucose. The objective of the present study was to determine the cellular and molecular mechanism by which NO regulates GLUT expression and glucose uptake in granulosa cells...
December 28, 2017: Endocrinology
https://www.readbyqxmd.com/read/29299797/transcriptome-assembly-and-expression-profiling-of-the-molecular-responses-to-cadmium-toxicity-in-cerebral-ganglia-of-wolf-spider-pardosa-pseudoannulata-araneae-lycosidae
#14
Huilin Yang, Yuande Peng, Yixue Shi, Jianxiang Tian, Juan Wang, Xianjin Peng, Chunliang Xie, Xiang Xu, Qisheng Song, Zhi Wang, Zhiyue Lv
Cadmium (Cd) is a heavy metal that can cause irreversible toxicity to animals, and is an environmental pollutant in farmlands. Spiders are considered to be an excellent model for investigating the impacts of heavy metals on the environment. To date, the changes at the molecular level in the cerebral ganglia of spiders are poorly understood. Cd exposure leads to strong damage in the nervous system, such as apoptosis and necrosis of nerve cells, therefore we conducted a transcriptomic analysis of Pardosa pseudoannulata cerebral ganglia under Cd stress to profile differential gene expression (DGE)...
January 3, 2018: Ecotoxicology
https://www.readbyqxmd.com/read/29298510/structural-activity-relationship-of-ginsenosides-from-steamed-ginseng-in-the-treatment-of-erectile-dysfunction
#15
Ang Ying, Qing-Tao Yu, Li Guo, Wen-Song Zhang, Jin-Feng Liu, Yun Li, Hong Song, Ping Li, Lian-Wen Qi, Ya-Zhong Ge, E-Hu Liu, Qun Liu
Ginseng has been reported to have diverse pharmacological effects. One of the therapeutic claims for ginseng is to enhance sexual function. Ginsenosides are considered as the major active constituents. A steaming process can alter the ginsenoside profile of ginseng products. The structure-function relationship of ginsenosides in the treatment of erectile dysfunction (ED) has not been investigated yet. In this work, 15 different processed ginsengs are produced by steaming, and 13 major ginsensosides are quantified by liquid chromatography with UV detection, including Rg1, Re, Rf, Rb1, Rc, Rb2, Rf, Rk3, Rh4, 20S-Rg3, 20R-Rg3, Rk1, and Rg5...
January 3, 2018: American Journal of Chinese Medicine
https://www.readbyqxmd.com/read/29298131/a-systematic-review-of-p53-regulation-of-oxidative-stress-in-skeletal-muscle
#16
Kaitlyn Beyfuss, David A Hood
BACKGROUND: p53 is a tumor suppressor protein involved in regulating a wide array of signaling pathways. The role of p53 in the cell is determined by the type of imposed oxidative stress, its intensity and duration. The last decade of research has unravelled a dual nature in the function of p53 in mediating the oxidative stress burden. However, this is dependent on the specific properties of the applied stress and thus requires further analysis. METHODS: A systematic review was performed following an electronic search of Pubmed, Google Scholar, and ScienceDirect databases...
January 3, 2018: Redox Report: Communications in Free Radical Research
https://www.readbyqxmd.com/read/29288927/novel-h2s-no-hybrid-molecule-zyz-803-promoted-synergistic-effects-against-heart-failure
#17
Dan Wu, Qingxun Hu, Ying Xiong, Deqiu Zhu, Yicheng Mao, Yi Zhun Zhu
Therapeutic strategies that increase hydrogen sulfide (H2S) or nitric oxide (NO) are cytoprotective in various models of cardiovascular injury. However, the nature of interaction between H2S and NO in heart failure and the underlying mechanisms for the protective effects remain undefined. The present study tested the cardioprotective effect of ZYZ-803, a novel synthetic H2S-NO hybrid molecule that decomposed to release H2S and NO. ZYZ-803 dose dependently improved left ventricular remodeling and preserved left ventricular function in the setting of isoprenaline-induced heart failure...
December 14, 2017: Redox Biology
https://www.readbyqxmd.com/read/29288802/increasing-extracellular-cgmp-in-cerebellum-in-vivo-reduces-neuroinflammation-gabaergic-tone-and-motor-in-coordination-in-hyperammonemic-rats
#18
Andrea Cabrera-Pastor, Tiziano Balzano, Vicente Hernández-Rabaza, Michele Malaguarnera, Marta Llansola, Vicente Felipo
Hyperammonemia is a main contributor to cognitive impairment and motor in-coordination in patients with hepatic encephalopathy. Hyperammonemia-induced neuroinflammation mediates the neurological alterations in hepatic encephalopathy. Intracerebral administration of extracellular cGMP restores some but not all types of cognitive impairment. Motor in-coordination, is mainly due to increased GABAergic tone in cerebellum. We hypothesized that extracellular cGMP would restore motor coordination in hyperammonemic rats by normalizing GABAergic tone in cerebellum and that this would be mediated by reduction of neuroinflammation...
December 27, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/29288679/the-gene-product-of-a-trypanosoma-equiperdum-ortholog-of-the-camp-dependent-protein-kinase-regulatory-subunit-is-a-monomeric-protein-that-is-not-capable-of-binding-cyclic-nucleotides
#19
José Bubis, Juan Carlos Martínez, Maritza Calabokis, Joilyneth Ferreira, Carlos E Sanz-Rodríguez, Victoria Navas, José Leonardo Escalona, Yurong Guo, Susan S Taylor
The full gene sequence encoding for the Trypanosoma equiperdum ortholog of the cAMP-dependent protein kinase (PKA) regulatory (R) subunits was cloned. A poly-His tagged construct was generated [TeqR-like(His)8], and the protein was expressed in bacteria and purified to homogeneity. The size of the purified TeqR-like(His)8 was determined to be ∼ 57,000 Da by molecular exclusion chromatography indicating that the parasite protein is a monomer. Limited proteolysis with various proteases showed that the T. equiperdum R-like protein possesses a hinge region very susceptible to proteolysis...
December 27, 2017: Biochimie
https://www.readbyqxmd.com/read/29288364/mirna-signature-predicts-the-response-of-patients-with-advanced-lung-adenocarcinoma-to-platinum-based-treatment
#20
Xiaoyue Xu, Shaorong Yu, Wenbo Sun, Xiaobing Qin, Yan Chen, Leilei Zhou, Rui Lou, Shuchen Dong, Bo Shen, Jianzhong Wu, Jialan Zang, Haixia Cao, Meiqi Shi, Qin Zhang, Jifeng Feng
BACKGROUND: Accumulating literature proved that miRNAs can regulate the sensitivity of platinum and act as a promising candidate to predict the response of patients with lung adenocarcinoma to chemotherapy. However, most studies on miRNAs were restricted to in vitro experiments. This study aimed to evaluate whether miRNAs alone or in combination (miRNA signature) can act as predictive biomarkers of platinum-based chemotherapy in patients with lung adenocarcinoma. METHODS: Eight miRNAs that most probably predict the efficacy of platinum were screened in 111 tumor tissues of lung adenocarcinoma...
December 29, 2017: Journal of Cancer Research and Clinical Oncology
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