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Aquaporin 1

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https://www.readbyqxmd.com/read/28940930/potential-role-of-the-methylation-of-vegf-gene-promoter-in-response-to-hypoxia-in-oxygen-induced-retinopathy-beneficial-effect-of-the-absence-of-aqp4
#1
Francesco Pisani, Maurizio Cammalleri, Massimo Dal Monte, Filippo Locri, Maria Grazia Mola, Grazia Paola Nicchia, Antonio Frigeri, Paola Bagnoli, Maria Svelto
Hypoxia-dependent accumulation of vascular endothelial growth factor (VEGF) plays a major role in retinal diseases characterized by neovessel formation. In this study, we investigated whether the glial water channel Aquaporin-4 (AQP4) is involved in the hypoxia-dependent VEGF upregulation in the retina of a mouse model of oxygen-induced retinopathy (OIR). The expression levels of VEGF, the hypoxia-inducible factor-1α (HIF-1α) and the inducible form of nitric oxide synthase (iNOS), the production of nitric oxide (NO), the methylation status of the HIF-1 binding site (HBS) in the VEGF gene promoter, the binding of HIF-1α to the HBS, the retinal vascularization and function have been determined in the retina of wild-type (WT) and AQP4 knock out (KO) mice under hypoxic (OIR) or normoxic conditions...
September 22, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28920823/diagnosis-and-treatment-of-a-unilateral-renal-cystadenoma-in-an-african-lion-panthera-leo
#2
Ronan Eustace, Jacob Rubin, Kimberly A Thompson, Kyle Snowdon, James G Sikarskie, Colleen Monahan, Rebecca C Smedley
A renal tubular cystadenoma was diagnosed in a 14-yr-old male African lion (Panthera leo). During a routine health evaluation, a left renal mass was identified via physical examination, radiographs, and abdominal ultrasonography. The mass was 30 × 15 cm in size and had a thin capsule with central hypoechoic fluid, suggestive of a perirenal cyst. An exploratory celiotomy with partial nephrectomy was performed without complications. Histologically, the tumor was characterized by a thick fibrous capsule surrounding multiple, variable-sized cysts that markedly compressed the adjacent fibrotic and atrophied renal cortex...
September 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28915794/genome-sequence-of-the-ectophytic-fungus-ramichloridium-luteum-reveals-unique-evolutionary-adaptations-to-plant-surface-niche
#3
Bo Wang, Xiaofei Liang, Mark L Gleason, Rong Zhang, Guangyu Sun
BACKGROUND: Ectophytic fungi occupy the waxy plant surface, an extreme environment characterized by prolonged desiccation, nutrient limitation, and exposure to solar radiation. The nature of mechanisms that facilitate adaptation to this environment remains unclear. In this study, we sequenced the complete genome of an ectophytic fungus, Ramichloridium luteum, which colonizes the surface of apple fruit, and carried out comparative genomic and transcriptome analysis. RESULTS: The R...
September 15, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28912594/quantification-of-aquaporin-z-reconstituted-into-vesicles-for-biomimetic-membrane-fabrication
#4
Hui Xian Gan, Hu Zhou, Qingsong Lin, Yen Wah Tong
Aquaporin incorporated biomimetic membranes are anticipated to offer unprecedented desalination capabilities. However, the lack of accurate methods to quantify the reconstituted aquaporin presents a huge hurdle in investigating aquaporin performance and optimizing membrane fabrication. Herein, we present three quantification methods to determine the Aquaporin-Z reconstituted into E. coli lipid vesicles: 1) nanogold labeling with transmission electron microscopy (TEM) visualization, 2) nickel labeling with inductively coupled plasma-mass spectrometry (ICP-MS) and 3) gel electrophoresis...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28910323/comparative-proteomic-analyses-reveal-the-proteome-response-to-short-term-drought-in-italian-ryegrass-lolium-multiflorum
#5
Ling Pan, Zhongfu Yang, Jianping Wang, Pengxi Wang, Xiao Ma, Meiliang Zhou, Ji Li, Nie Gang, Guangyan Feng, Junming Zhao, Xinquan Zhang
Drought is a major abiotic stress that impairs growth and productivity of Italian ryegrass. Comparative analysis of drought responsive proteins will provide insight into molecular mechanism in Lolium multiflorum drought tolerance. Using the iTRAQ-based approach, proteomic changes in tolerant and susceptible lines were examined in response to drought condition. A total of 950 differentially accumulated proteins was found to be involved in carbohydrate metabolism, amino acid metabolism, biosynthesis of secondary metabolites, and signal transduction pathway, such as β-D-xylosidase, β-D-glucan glucohydrolase, glycerate dehydrogenase, Cobalamin-independent methionine synthase, glutamine synthetase 1a, Farnesyl pyrophosphate synthase, diacylglycerol, and inositol 1, 4, 5-trisphosphate, which might contributed to enhance drought tolerance or adaption in Lolium multiflorum...
2017: PloS One
https://www.readbyqxmd.com/read/28906027/sur1-trpm4-and-aqp4-form-a-heteromultimeric-complex-that-amplifies-ion-water-osmotic-coupling-and-drives-astrocyte-swelling
#6
Jesse A Stokum, Min S Kwon, Seung K Woo, Orest Tsymbalyuk, Rudi Vennekens, Volodymyr Gerzanich, J Marc Simard
Astrocyte swelling occurs after central nervous system injury and contributes to brain swelling, which can increase mortality. Mechanisms proffered to explain astrocyte swelling emphasize the importance of either aquaporin-4 (AQP4), an astrocyte water channel, or of Na(+) -permeable channels, which mediate cellular osmolyte influx. However, the spatio-temporal functional interactions between AQP4 and Na(+) -permeable channels that drive swelling are poorly understood. We hypothesized that astrocyte swelling after injury is linked to an interaction between AQP4 and Na(+) -permeable channels that are newly upregulated...
September 14, 2017: Glia
https://www.readbyqxmd.com/read/28879451/prognostic-factors-and-disease-course-in-aquaporin-4-antibody-positive-chinese-patients-with-acute-optic-neuritis
#7
Hao Kang, Tingjun Chen, Hongyang Li, Quangang Xu, Shanshan Cao, Shihui Wei
The objective is to assess the frequency of AQP4-Ab in Chinese patients with optic neuritis (ON) and to investigate the prognostic implications of AQP4-Ab seropositivity in such patients. The presence of aquaporin-4 (AQP4) antibodies in human AQP4-transfected cells was determined by indirect immunofluorescence, and the diagnostic and prognostic relevance of AQP4 antibodies in 215 Chinese patients with optic neuritis was evaluated. The patients were enrolled from the Chinese People's Liberation Army General Hospital (PLAGH) and followed up to 1-228 months...
September 6, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28875419/lactulose-decreases-neuronal-activation-and-attenuates-motor-behavioral-deficits-in-hyperammonemic-rats
#8
Natália Ferreira Mendes, Flora França Nogueira Mariotti, José Simões de Andrade, Milena de Barros Viana, Isabel Cristina Céspedes, Márcia Regina Nagaoka, Luciana Le Sueur-Maluf
Lactulose is a nonabsorbable disaccharide commonly used in clinical practice to treat hepatic encephalopathy. However, its effects on neuropsychiatric disorders and motor behavior have not been fully elucidated. Male Wistar rats were bile-duct ligated, and 3 weeks after surgery, treated with lactulose administrated by gavage (1.43 or 3.57 g/kg), once a day for seven days. Plasma levels of ammonia, aspartate aminotransferase, total bilirubin, and creatinine were quantified and histopathological analysis of the livers was performed...
September 5, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28871493/plant-and-animal-aquaporins-crosstalk-what-can-be-revealed-from-distinct-perspectives
#9
REVIEW
Moira Sutka, Gabriela Amodeo, Marcelo Ozu
Aquaporins (AQPs) can be revisited from a distinct and complementary perspective: the outcome from analyzing them from both plant and animal studies. (1) The approach in the study. Diversity found in both kingdoms contrasts with the limited number of crystal structures determined within each group. While the structure of almost half of mammal AQPs was resolved, only a few were resolved in plants. Strikingly, the animal structures resolved are mainly derived from the AQP2-lineage, due to their important roles in water homeostasis regulation in humans...
September 4, 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/28857723/aquaporin-4-serostatus-does-not-predict-response-to-immunotherapy-in-neuromyelitis-optica-spectrum-disorders
#10
Maureen A Mealy, Su-Hyun Kim, Felix Schmidt, Reydmar López, Jorge A Jimenez Arango, Friedemann Paul, Dean M Wingerchuk, Benjamin M Greenberg, Ho Jin Kim, Michael Levy
BACKGROUND: Debate exists about whether neuromyelitis optica spectrum disorder seronegative disease represents the same immune-mediated attack on astrocytic aquaporin-4 as in seropositive disease. OBJECTIVE: We investigated whether response to common treatments for neuromyelitis optica spectrum disorder differed by serostatus, as assessed by change in annualized relapse rate. METHODS: We performed a multicenter retrospective analysis of 245 patients with neuromyelitis optica spectrum disorder who were treated with either rituximab or mycophenolate mofetil as their first-line immunosuppressive treatment for disease prevention...
August 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28843412/single-tubule-rna-seq-uncovers-signaling-mechanisms-that-defend-against-hyponatremia-in-siadh
#11
Jae Wook Lee, Mohammad Alsady, Chung-Lin Chou, Theun de Groot, Peter M T Deen, Mark A Knepper, Carolyn M Ecelbarger
In the syndrome of inappropriate antidiuretic hormone secretion (SIADH), hyponatremia is limited by onset of vasopressin-escape caused by loss of the water channel aquaporin-2 in the renal collecting duct despite high circulating vasopressin. Here, we use the methods of systems biology in a well-established rat model of SIADH to identify signaling pathways activated at the onset of vasopressin-escape. Using single-tubule RNA-Seq, full transcriptomes were determined in microdissected cortical collecting ducts of vasopressin-treated rats at 1, 2, and 4 days after initiation of oral water loading in comparison to time-control rats without water loading...
August 23, 2017: Kidney International
https://www.readbyqxmd.com/read/28832134/transcriptomic-response-of-arabidopsis-thaliana-exposed-to-cuo-nanoparticles-bulk-material-and-ionic-copper
#12
Premysl Landa, Pavel Dytrych, Sylva Prerostova, Sarka Petrova, Radomira Vankova, Tomas Vanek
Engineered nanoparticles (ENPs) exhibit unique properties advantageous in a number of applications, but they also represent potential health and environmental risks. In this study, we investigated the phytotoxic mechanism of CuO ENPs using transcriptomic analysis and compared this response with the response to CuO bulk particles and ionic Cu(2+). Ionic Cu(2+) at the concentration of 0.16 mg L(-1) changed transcription of 2692 genes (p value of <0.001, fold change of ≥2) after 7 days of exposure, whereas CuO ENPs and bulk particles (both in the concentration of 10 mg L(-1)) altered the expression of 922 and 482 genes in Arabidopsis thaliana roots, respectively...
September 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28831548/comparison-of-the-efficacy-of-azathioprine-and-rituximab-in-neuromyelitis-optica-spectrum-disorder-a-randomized-clinical-trial
#13
Zahra Nikoo, Shervin Badihian, Vahid Shaygannejad, Nasrin Asgari, Fereshteh Ashtari
Neuromyelitis optica spectrum disorder (NMOSD) often follows a relapsing course. As disability in NMOSD is attack-related, effective treatments are needed. We aimed to compare the efficacy of azathioprine (AZA) and rituximab (RIT) as maintenance therapy in NMOSD patients. An open, randomized clinical trial was conducted during September 2015 to December 2016, in Isfahan, Iran. Initially, 100 NMOSD patients were approached, 86 entered the study, and 68 cases completed the trial. All patients had a relapsing-remitting course with expanded disability extended scale (EDSS) ≤7 (median 2...
August 22, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28826713/discovery-of-aquaporin-1-and-aquaporin-4-expression-in-an-intramedullary-spinal-cord-ependymal-cyst-case-report
#14
Matthew J Shepard, Varun Padmanaban, Nancy A Edwards, Prashant Chittiboina, Abhik Ray-Chaudhury, John D Heiss
BACKGROUND: Intramedullary ependymal cysts of the spinal cord are rare, benign fluid filled cysts usually situated along the ventral surface of the spinal cord. Since they were first described, only 32 cases have been reported. Thus, owing to the rarity at which these cysts are encountered, their management and pathogenesis remain controversial. While some have previously advocated for cysto-subarachnoid shunt placement for symptomatic ependymal cysts, others have argued for complete cyst resection or simple fenestration...
August 4, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28822459/oral-propylene-glycol-modifies-follicular-fluid-and-gene-expression-profiles-in-cumulus-oocyte-complexes-and-embryos-in-feed-restricted-heifers
#15
G Gamarra, C Ponsart, S Lacaze, F Nuttinck, A Cordova, P Mermillod, B Marquant-Le Guienne, D Monniaux, P Humblot, A A Ponter
Dietary supplementation with propylene glycol (PG) increases in vitro production of high-quality embryos in feed-restricted heifers. The aim of the present study was to evaluate the effects of PG in feed-restricted heifers on follicular fluid insulin and insulin-like growth factor (IGF) 1 concentrations, expression of IGF system genes in oocytes and cumulus cells and the expression of selected genes in blastocysts. Feed-restricted (R) heifers were drenched with water or PG during induced oestrous cycles (400mL of PG or water/drench, daily drenching at 1600 hours for the first 9 days of the oestrous cycle)...
August 21, 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28822114/glycosylation-of-dentin-matrix-protein-1-is-a-novel-key-element-for-astrocyte-maturation-and-bbb-integrity
#16
Bo Jing, Chunxue Zhang, Xianjun Liu, Liqiang Zhou, Jiping Liu, Yinan Yao, Juehua Yu, Yuteng Weng, Min Pan, Jie Liu, Zuolin Wang, Yao Sun, Yi Eve Sun
The blood-brain barrier (BBB) is a tight boundary formed between endothelial cells and astrocytes, which separates and protects brain from most pathogens as well as neural toxins in circulation. However, detailed molecular players involved in formation of BBB are not completely known. Dentin matrix protein 1 (DMP1)-proteoglycan (PG), which is known to be involved in mineralization of bones and dentin, is also expressed in soft tissues including brain with unknown functions. In the present study, we reported that DMP1-PG was expressed in brain astrocytes and enriched in BBB units...
August 18, 2017: Protein & Cell
https://www.readbyqxmd.com/read/28820014/postinfectious-anti-myelin-oligodendrocyte-glycoprotein-antibody-positive-optic-neuritis-and-myelitis
#17
J P Vieira, J Sequeira, M J Brito
We report the case of a 9-year-old girl admitted with fever, headache, and a cerebrospinal fluid lymphocytic pleocytosis. Polymerase chain reaction was positive for human herpes virus 6. She subsequently developed ataxia and bilateral loss of vision. Magnetic resonance imaging (MRI) showed bilateral optic nerve lesions with extension to optic chiasm and a short-segment myelitis. Serologic studies were positive for Borrelia burgdorferi IgM. Anti-aquaporin 4 antibody was negative and anti-myelin oligodendrocyte glycoprotein antibody (MOG) positive...
January 1, 2017: Journal of Child Neurology
https://www.readbyqxmd.com/read/28816009/protective-effect-of-atazanavir-sulfate-against-pulmonary-fibrosis-in-vivo-and-in-vitro
#18
Shina Song, Yunxia Ji, Guanghua Zhang, Xue Zhang, Bin Li, Defang Li, Wanglin Jiang
Atazanavir sulfate, an antiretroviral protease inhibitor, has been used to treat HIV/AIDS, but its ability to serve as an anti-pulmonary fibrosis (PF) agent remains unknown. In this study, the effects of atazanavir sulfate on various aspects of PF were examined and CoCl2 was used to induce the hypoxia-mimicking condition in vitro, including epithelial-mesenchymal transition (EMT) in A549 cells, endothelial-mesenchymal transition (EndMT) in human pulmonary microvascular endothelial cells (HPMECs), proliferation in human lung fibroblasts (HLF-1) and potential protective effects in human type I alveolar epithelial cells (AT I)...
August 16, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28810657/anti-exudation-effects-of-sodium-ferulate-and-oxymatrine-combination-via-modulation-of-aquaporin-1
#19
Songmei Sun, Xing Du, Mengxin Xu, Meijuan Liu, Zhifeng Liu
The present study aimed to investigate the anti-exudative effects of sodium ferulate combined with oxymatrine in a mouse model of acetic acid-induced peritonitis. Furthermore, the underlying mechanisms were explored by determining the effects of these drugs on the volume and aquaporin 1 (AQP1) expression in vascular endothelial cells on omentum majus and human umbilical vein endothelial cells (HUVEC). Treatment with sodium ferulate combined with oxymatrine was shown to significantly inhibit acetic acid-induced vascular permeability in the peritonitis model mice and furthermore to significantly decrease the optical density of Evans blue, the leukocyte number and the levels of interleukin-6, C-reactive protein and interferon-γ in peritoneal lavage fluid...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28798257/aquaporin-1-mediated-changes-in-pulmonary-arterial-smooth-muscle-cell-migration-and-proliferation-involve-%C3%AE-catenin
#20
Xin Yun, Haiyang Jiang, Ning Lai, Jian Wang, Larissa A Shimoda
Exposure to hypoxia induces migration and proliferation of pulmonary arterial smooth muscle cells (PASMCs), leading to vascular remodeling and contributing to the development of hypoxic pulmonary hypertension. The mechanisms controlling PASMC growth and motility are incompletely understood, although aquaporin 1 plays an important role. In tumor, kidney and stem cells, AQP1 has been shown to interact with β-catenin, a dual function protein that activates the transcription of crucial target genes (i.e., c-Myc and cyclin D1) related to cell migration and proliferation...
August 10, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
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