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https://www.readbyqxmd.com/read/28444988/inhibitory-action-of-oxytocin-on-spontaneous-contraction-of-rat-distal-colon-by-nitrergic-mechanism-involvement-of-cyclic-gmp-and-apamin-sensitive-k-channels
#1
R Wang, M T Han, X L Lv, Y A Yu, S Q Chai, C M Qu, C Y Liu
AIM: The mechanisms underlying the inhibitory effects of oxytocin (OT) on colon tone are not totally understood. We explore the mechanisms of OT on spontaneous contractility in rat distal colon, and identify the mediators involved in this action. METHODS: In rat distal colon strips, mechanical activity was analyzed and the production of nitric oxide (NO) in tissue loaded with the fluorochrome DAF-FM was visualized by confocal microscopy. OT receptor (OTR) expression was determined by western blotting and immunofluorescence...
April 26, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28444734/highly-electronegative-low-density-lipoprotein-l5-evokes-microglial-activation-and-creates-a-neuroinflammatory-stress-via-toll-like-receptor-4-signaling
#2
Liang-En Yu, Chiou-Lian Lai, Ching-Tien Lee, Jiz-Yuh Wang
Atherogenic risk factors, such as hypercholesterolemia, are associated with increased risk of neurodegeneration, especially Alzheimer's dementia. Human plasma electronegative low-density lipoprotein [LDL(-)], especially L5, may serve as an important contributing factor. L5 promoting an inflammatory action in atherosclerosis has been extensively studied. However, the role of L5 in inducing neuroinflammation remains unknown. Here, we examined the impact of L5 on immune activation and cell viability in cultured BV-2 microglia...
April 26, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28444690/strobilurins-as-growth-promoting-compounds-how-stroby-regulates-arabidopsis-leaf-growth
#3
Judith Van Dingenen, Chrystalla Antoniou, Panagiota Filippou, Jacob Pollier, Nathalie Gonzalez, Stijn Dhondt, Alain Goossens, Vasileios Fotopoulos, Dirk Inzé
Strobilurins are an important class of agrochemical fungicides used throughout the world on a wide variety of crops as protection against fungal pathogens. In addition to this protective role, they are reported to also positively influence plant physiology. In this study, we analyzed the effect of Stroby® WG, a commercially available fungicide consisting of 50% (w/w) kresoxim-methyl (KM) as active strobilurin compound, on Arabidopsis leaf growth. Treatment of seedlings with Stroby resulted in larger leaves due to an increase in cell number...
April 25, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28444344/hydrogen-sulfide-regulates-the-cytosolic-nuclear-partitioning-of-glyceraldehyde-3-phosphate-dehydrogenase-by-enhancing-its-nuclear-localization
#4
Ángeles Aroca, Markus Schneider, Renate Scheibe, Cecilia Gotor, Luis C Romero
Hydrogen sulfide is an important signaling molecule comparable to nitric oxide and hydrogen peroxide in plants. The underlying mechanism of its action is unknown, although it has been proposed to be S-sulhydration. This posttranslational modification converts the thiol groups of cysteines within proteins to persulfides, resulting in functional changes of the proteins. In Arabidopsis thaliana, S-sulfhydrated proteins have been identified, including the cytosolic isoforms of glyceraldehyde-3-phosphate dehydrogenase GapC1 and GapC2...
April 24, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28444173/tac1-signaling-is-required-for-sexual-maturation-and-responsiveness-of-gnrh-neurons-to-kisspeptin-in-the-male-mouse
#5
Caroline A Maguire, Yong Bhum Song, Min Wu, Silvia León, Rona S Carroll, Meenakshi Alreja, Ursula B Kaiser, Víctor M Navarro
The tachykinins substance P (SP) and neurokinin A (NKA) (Tac1) have emerged as novel regulators of kisspeptin/GnRH release. Recently, we documented that SP modulates reproductive function in the female mouse. Here, we extended this characterization to the male mouse. Tac1-/- male mice showed delayed puberty onset. They also presented significantly decreased expression levels of Pdyn (dynorphin) and Nos1 (nitric oxide synthase) in the mediobasal hypothalamus and elevated Gnrh1 levels. Unexpectedly, the response of Tac1-/- mice to central kisspeptin or senktide (neurokinin B receptor -NK3R- agonist) administration was significantly decreased compared with controls, despite the preserved ability of GnRH neurons to stimulate LH release as demonstrated by central NMDA administration, suggesting a deficit at the GnRH neuron level...
April 21, 2017: Endocrinology
https://www.readbyqxmd.com/read/28444132/tyrosine-phosphorylation-of-enos-regulates-myocardial-survival-after-an-ischaemic-insult-role-of-pyk2
#6
Sofia-Iris Bibli, Zongmin Zhou, Sven Zukunft, Beate Fisslthaler, Ioanna Andreadou, Csaba Szabo, Peter Brouckaert, Ingrid Fleming, Andreas Papapetropoulos
Aims: Endothelial nitric oxide (NO) synthase (eNOS) is known to play a cardioprotective protective. However, the molecular mechanisms regulating eNOS activity during ischaemia/reperfusion (I/R) injury are incompletely understood. eNOS is a substrate for several kinases that positively or negatively affect its enzymatic activity. Herein, we sought to correlate eNOS phosphorylation status with cardiomyocyte survival and we investigated the contribution of the proline-rich tyrosine kinase 2 (PYK2)/eNOS axis to the regulation of myocardial infarct size in vivo...
April 20, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28444106/the-association-of-air-pollution-with-pubertal-development-evidence-from-hong-kong-s-children-of-1997-birth-cohort
#7
Jian V Huang, Gabriel M Leung, C Mary Schooling
Many pollutants are endocrine disruptors with impacts on reproduction and health in animals, but evidence in humans, of which sex-specific effects on pubertal development may be an indicator, is less clear. We examined the association of air pollution in utero and during early life with pubertal development in Hong Kong, China, an area with a high level of air pollution compared with other similarly developed cities. We assessed sex-specific associations of particulate matter less than or equal to 10 μm in diameter (PM10), nitric oxide, sulfur dioxide, and nitrogen dioxide in different growth phases with clinically assessed pubertal stage at approximately age 11 years (as indicated by Tanner stage) in a large population-representative birth cohort, the "Children of 1997...
April 21, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28443955/a-single-resistance-exercise-session-improves-aortic-endothelial-function-in-hypertensive-rats
#8
Thaís de Oliveira Faria, Jhuli Keli Angeli, Luiz Guilherme Marchesi Mello, Gustavo Costa Pinto, Ivanita Stefanon, Dalton Valentim Vassallo, Juliana Hott de Fúcio Lizardo
BACKGROUND: Physical exercise is an important tool for the improvement of endothelial function. OBJECTIVE: To assess the effects of acute dynamic resistance exercise on the endothelial function of spontaneously hypertensive rats (SHR). METHODS: Ten minutes after exercise, the aorta was removed to evaluate the expression of endothelial nitric oxide synthase (eNOS), phosphorylated endothelial nitric oxide synthase (p-eNOS1177) and inducible nitric oxide synthase (iNOS) and to generate concentration-response curves to acetylcholine (ACh) and to phenylephrine (PHE)...
March 2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/28443823/gene-expression-oxidative-stress-and-apoptotic-changes-in-rabbit-ileum-experimentally-infected-with-eimeria-intestinalis
#9
Heba M Abdel-Haleem, Shawky M Aboelhadid, Thabet Sakran, Gamal El-Shahawy, Huda El-Fayoumi, Saleh Al-Quraishy, Abdel-Azeem S Abdel-Baki
Coccidiosis is a parasitic disease caused by protists (apicomplexans) of the genus Eimeria Schneider, 1875 and is considered to be the most important disease faced by rabbit breeders due to its high morbidity. In the present study, the antioxidant status and changes in apoptosis and in the expression of some genes were quantified in rabbits' ilea following infection with Eimeria intestinalis Cheissin, 1948. Rabbits, orally infected with 1 × 10(5) sporulated oocysts of E. intestinalis, started to shed oocysts in their faeces on 8 days post infection (dpi) and reached maximum excretion on 10 dpi, with approximately 5 million oocysts...
April 19, 2017: Folia Parasitologica
https://www.readbyqxmd.com/read/28443590/effects-of-apigenin-on-experimental-ischemia-reperfusion-injury-in-the-rat-ovary
#10
Zeynep Soyman, Sefa Kelekçi, Veysel Sal, Osman Şevket, Nihan Bayındır, Hafize Uzun
BACKGROUND: Apigenin, is a plant-derived compound belonging to flavone class, possess antioxidant, free radical scavenging and anti-inflammatory manners. AIMS: This paper aims to address effects of apigenin upon serum antimüllerian hormone (AMH) levels, tissue oxidative stress parameters and histopathological changes in ovarian ischemia/reperfusion (I/R) injury. STUDY DESIGN: Animal experiment. METHODS: Twenty eight female Wistar albino rats have been separated to four sections in a random way: Sham operation (Group 1), I/R plus saline (Group 2), I/R plus dimethyl sulfoxide (Group 3) and I/R plus apigenin (Group 4)...
April 13, 2017: Balkan Medical Journal
https://www.readbyqxmd.com/read/28443074/zinc-dependent-transcriptional-regulation-in-paracoccus-denitrificans
#11
Durga P Neupane, Belkis Jacquez, Anitha Sundararajan, Thiruvarangan Ramaraj, Faye D Schilkey, Erik T Yukl
Zinc homeostasis is critical for bacterial survival and is mediated largely at the transcriptional level by the regulation of zinc uptake and efflux genes. Here we use RNA-seq to assess transcriptional changes as a result of zinc limitation in the denitrifying bacterium Paracoccus denitrificans. The results identify the differential expression of 147 genes, most of which were upregulated in zinc-depleted medium. Included in this set of genes are a large number of transition metal transporters, several transcription factors, and hypothetical proteins...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28443065/hemoglobin-improved-protection-in-cultured-cerebral-cortical-astroglial-cells-inhibition-of-oxidative-stress-and-caspase-activation
#12
Fatma Amri, Ikram Ghouili, Marie-Christine Tonon, Mohamed Amri, Olfa Masmoudi-Kouki
Oxidative stress plays a major role in triggering astroglial cell death in diverse neuropathological conditions such as ischemia and neurodegenerative diseases. Numerous studies indicate that hemoglobin (Hb) is expressed in both resting and reactive glia cells, but nothing is known regarding a possible role of Hb on astroglial cell survival. Thus, the purpose of the present study was to investigate the potential glioprotective effect of Hb on hydrogen peroxide (H2O2)-induced oxidative stress and apoptosis in cultured rat astrocytes...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28443016/genetics-of-aggression-in-alzheimer-s-disease-ad
#13
Walter J Lukiw, Evgeny I Rogaev
Alzheimer's disease (AD) is a terminal, age-related neurological syndrome exhibiting progressive cognitive and memory decline, however AD patients in addition exhibit ancillary neuropsychiatric symptoms (NPSs) and these include aggression. In this communication we provide recent evidence for the mis-regulation of a small family of genes expressed in the human hippocampus that appear to be significantly involved in expression patterns common to both AD and aggression. DNA array- and mRNA transcriptome-based gene expression analysis and candidate gene association and/or genome-wide association studies (CGAS, GWAS) of aggressive attributes in humans have revealed a surprisingly small subset of six brain genes that are also strongly associated with altered gene expression patterns in AD...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28442706/nitric-oxide-no-mediates-the-inhibition-of-form-deprivation-myopia-by-atropine-in-chicks
#14
Brittany J Carr, William K Stell
Myopia is the most common childhood refractive disorder. Atropine inhibits myopia progression, but its mechanism is unknown. Here, we show that myopia-prevention by atropine requires production of nitric oxide (NO). Form-deprivation myopia (FDM) was induced in week-old chicks by diffusers over the right eye (OD); the left eye (OS) remained ungoggled. On post-goggling days 1, 3, and 5, OD received intravitreally 20 µL of phosphate-buffered saline (vehicle), or vehicle plus: NO source: L-arginine (L-Arg, 60-6,000 nmol) or sodium nitroprusside (SNP, 10-1,000 nmol); atropine (240 nmol); NO inhibitors: L-NIO or L-NMMA (6 nmol); negative controls: D-Arg (10 µmol) or D-NMMA (6 nmol); or atropine plus L-NIO, L-NMMA, or D-NMMA; OS received vehicle...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28442577/association-between-exposure-in-the-cement-production-industry-and-non-malignant-respiratory-effects-a-systematic-review
#15
Anne Kristin Møller Fell, Karl Christian Nordby
OBJECTIVES: Based on findings from a systematic literature search, we present and discuss the evidence for an association between exposure to cement dust and non-malignant respiratory effects in cement production workers. DESIGN AND SETTING: Systematic literature searches (MEDLINE and Embase) were performed. Outcomes were restricted to respiratory symptoms, lung function indices, asthma, chronic bronchitis, chronic obstructive pulmonary disease, pneumoconiosis, induced sputum or fraction of exhaled nitric oxide (FeNO) measurements...
April 24, 2017: BMJ Open
https://www.readbyqxmd.com/read/28442215/-neopterin-levels-and-systemic-inflammatory-response-syndrome-in-pediatric-critically-ill-patients
#16
Raquel Gil-Gómez, Javier Blasco-Alonso, Pilar Sánchez-Yáñez, Vanessa Rosa-Camacho, Guillermo Milano Manso
INTRODUCTION: Neopterin and biopterin are sub-products of redox reactions, which act as cofactors of enzymes responsible for nitric oxide production. The hypothesis is presented that plasma neopterin and biopterin evolve differently during the first days in a critically ill child. METHODS: A single-centre prospective observational study was conducted on patients 7 days to 14 years admitted to our Paediatric Intensive Care Unit (PICU) and that met Systemic inflammatory response syndrome (SIRS) criteria...
April 22, 2017: Anales de Pediatría: Publicación Oficial de la Asociación Española de Pediatría (A.E.P.)
https://www.readbyqxmd.com/read/28442107/in%C3%A2-vitro-and-in%C3%A2-vivo-investigation-of-natural-compounds-from-seed-extract-of-mucuna-pruriens-lacking-l-dopa-for-the-treatment-of-erectile-dysfunction
#17
Natthachai Duangnin, Thanyaluck Phitak, Peraphan Pothacharoen, Prachya Kongtawelert
OBJECTIVE: To investigate the biological effects of the Mucuna pruriens (M. pruriens) seed extracts that lacked l-DOPA, which was formerly reported as the active ingredient, on erectile dysfunction (ED) both in vitro and in vivo. METHODS: Seed of M. pruriens plant that cultivated in Mae Taeng District, Chiang Mai Province, Thailand, was collected. Component of its seeds were extracted and isolated into 2 fractions using methanol, polar and nonpolar. Each fraction was investigated for phytochemicals using gas chromatography and mass spectroscopy and was screened for biological activity in vitro using three different cell lines...
March 2017: Asian Pacific Journal of Tropical Medicine
https://www.readbyqxmd.com/read/28442026/neuromodulatory-effect-of-oestradiol-in-the-metabolism-of-ovarian-progesterone-and-oestradiol-during-dioestrus-ii-participation-of-the-superior-mesenteric-ganglion
#18
Adriana Vega Orozco, Cynthia Bronzi, Sandra Vallcaneras, Zulema Sosa, Marilina Casais
The aims of the present study were to determine: (1) whether oestradiol (E2) in the superior mesenteric ganglion (SMG) modifies the release of ovarian progesterone (P4), androstenedione (A2) and E2, the activity and gene expression of 3β-hydroxysteroid dehydrogenase (3β-HSD) and 20α-HSD and the expression of P450 aromatase (Cyp19a1) and (2) whether any such modifications are related to changes in ovarian nitric oxide (NO) and noradrenaline (NA) levels during dioestrus II. Using an ex vivo SMG-ovarian nervous plexus-ovary system, ovarian P4 release was measured following the addition E2 plus tamoxifen (Txf) (10-6M) to the ganglion, whereas A2, E2, NA and NO were measured following the addition of E2 alone...
April 26, 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28441717/dexmedetomidine-relieves-formaldehyde-induced-pain-in-rats-through-both-%C3%AE-2-adrenoceptor-and-imidazoline-receptor
#19
Hong Zhang, Xiang Yan, De-Gui Wang, Yu-Fang Leng, Zhan-Hai Wan, Yong-Qiang Liu, Yan Zhang
Dexmedetomidine (DEX) is a highly selective α2 adrenergic receptor agonist. In this study, we investigated the analgesic effect and the underlying mechanisms of DEX on inflammatory visceral pain in rats. Twenty-five male Sprague Dawley (SD) rats were randomly divided into 5 groups, including control, sham, low dose DEX, medium dose DEX and high dose DEX group. Pain was induced with 10% formalin and scored every 15min till 2 h-post the induction. Hematoxylin-eosin (HE) staining was used to evaluate the toxicity of DEX on spinal cord neurons...
April 21, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28441692/physiological-role-of-endothelin-1-in-flow-mediated-vasodilatation-in-humans-and-impact-of-cardiovascular-risk-factors
#20
Jérémy Bellien, Michèle Iacob, Christelle Monteil, Isabelle Rémy-Jouet, Clothilde Roche, Thomas Duflot, Cathy Vendeville, Laurence Gutierrez, Christian Thuillez, Vincent Richard, Robinson Joannidès
OBJECTIVES: The current study addressed the hypothesis that the local decrease in endothelin-1 (ET-1) bioavailability during sustained flow increases contributes to endothelium-dependent, flow-mediated dilatation (FMD) of conduit arteries and is altered in presence of cardiovascular risk factors. METHODS AND RESULTS: In nine young healthy individuals, the decrease in local ET-1 plasma levels and radial artery FMD in response to hand skin heating (from 34 to 44 °C) was not affected by endothelin type A (ETA) receptor blockade, achieved using the brachial infusion of BQ-123 (100 nmol/min per l of forearm), as compared with physiological saline (0...
June 2017: Journal of Hypertension
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