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Aquaporin 9

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https://www.readbyqxmd.com/read/28104255/nmosd-triggered-by-yellow-fever-vaccination-an-unusual-clinical-presentation-with-segmental-painful-erythema
#1
F Schöberl, E Csanadi, O Eren, M Dieterich, T Kümpfel
Neuromyelitis Optica Spectrum Disorder (NMOSD) is an immune-mediated disease of the central nervous system with the presence of aquaporin 4-antibodies (AQP4-abs) in most cases. We describe a patient who developed NMOSD after a yellow fever vaccination. He presented to us with an unusual painful erythema Th7-9 triggered by touch in the respective skin area due to a cervical spinal cord lesion affecting the dorsolateral parts of C6/7. To our knowledge, this is the first case of NMOSD with such a clinical presentation expanding the clinical spectrum of NMOSD...
January 2017: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/28071581/role-of-aqp4-antibody-serostatus-and-its-prediction-of-visual-outcome-in-neuromyelitis-optica-a-systematic-review-and-meta-analysis
#2
Nan Lin, Qing Liu, Xiaoyu Wang, Jianmei Ma, Yuyuan Li
: Backgroud: Neuromyelitis optica (NMO) is an autoimmune inflammatory disorder, which is characterized by severe attacks of optic neuritis and myelitis. Antibodies (Ab) to aquaporin-4 (AQP4) (or NMO-IgG) as a serological biomarker of NMO have been widespread used. Nevertheless, some NMO patients remain seronegative for AQP4-Ab and/or have no detected optic nerve involvement. In addition, no consensus exists on the association between AQP4-Ab serostatus and visual outcome in NMO. To drive a more precise estimate of this postulated relationship, a meta-analysis was performed based on existing relevant studies...
January 10, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28067896/pathogenic-role-of-endogenous-tnf-%C3%AE-in-the-development-of-sj%C3%A3-gren-s-like-sialadenitis-and-secretory-dysfunction-in-non-obese-diabetic-mice
#3
Jing Zhou, Toshihisa Kawai, Qing Yu
Patients with Sjögren's syndrome (SS), an autoimmune disease primarily affecting exocrine glands, exhibit enhanced TNF-α expression in the saliva and salivary glands. However, the precise in vivo role of TNF-α during the initiation and development of SS is not clearly defined. The present study is undertaken to determine the function of endogenously produced TNF-α in the pathogenesis of SS in non-obese diabetic (NOD) mice, a model of this human disease. Administration of a neutralizing anti-TNF-α antibody to female NOD mice during the stage prior to disease onset significantly improved salivary secretion, indicating a remission of clinical symptoms of SS...
January 9, 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/28059647/simulating-vasogenic-brain-edema-using-chronic-vegf-infusion
#4
Martin Piazza, Jeeva Munasinghe, Roger Murayi, Nancy Edwards, Blake Montgomery, Stuart Walbridge, Marsha Merrill, Prashant Chittiboina
OBJECTIVE To study peritumoral brain edema (PTBE), it is necessary to create a model that accurately simulates vasogenic brain edema (VBE) without introducing a complicated tumor environment. PTBE associated with brain tumors is predominantly a result of vascular endothelial growth factor (VEGF) secreted by brain tumors, and VEGF infusion alone can lead to histological blood-brain barrier (BBB) breakdown in the absence of tumor. VBE is intimately linked to BBB breakdown. The authors sought to establish a model for VBE with chronic infusion of VEGF that can be validated by serial in-vivo MRI and histological findings...
January 6, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28049557/dynamical-modeling-of-liver-aquaporin-9-expression-and-glycerol-permeability-in-hepatic-glucose-metabolism
#5
Patrizia Gena, Nicoletta Del Buono, Marcello D'Abbicco, Maria Mastrodonato, Marco Berardi, Maria Svelto, Luciano Lopez, Giuseppe Calamita
Liver is crucial in the homeostasis of glycerol, an important metabolic intermediate. Plasma glycerol is imported by hepatocytes mainly through Aquaporin-9 (AQP9), an aquaglyceroporin channel negatively regulated by insulin in rodents. AQP9 is of critical importance in glycerol metabolism since hepatic glycerol utilization is rate-limited at the hepatocyte membrane permeation step. Glycerol kinase catalyzes the initial step for the conversion of the imported glycerol into glycerol-3-phosphate, a major substrate for de novo synthesis of glucose (gluconeogenesis) and/or triacyglycerols (lipogenesis)...
December 28, 2016: European Journal of Cell Biology
https://www.readbyqxmd.com/read/28017200/the-characteristics-of-spinal-imaging-in-different-types-of-demyelinating-diseases
#6
Chaisak Dumrikarnlert, Sasitorn Siritho, Pimwalai Chulapimphan, Chanon Ngamsombat, Chanjira Satukijchai, Naraporn Prayoonwiwat
BACKGROUND: Transverse myelitis is the common presentation in demyelinating conditions. OBJECTIVE: To determine the characteristics of spinal lesions among each type of demyelinating diseases. METHODS: Medical records and spinal imaging of patients who were [1] older than 18years, [2] had at least one attack of TM, [3] had available spinal MRI data and [4] were tested for aquaporin-4 antibody were included. RESULTS: One hundred and fifty-eight patients were eligible (27 clinically isolated syndrome [CIS], 38 MS, 55 seropositive neuromyelitis optica spectrum disorders [NMOSD], 9 seronegative NMOSD, and 29 idiopathic transverse myelitis [IDD-TM])...
January 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28004290/quantitative-analysis-of-aquaporin-expression-levels-during-the-development-and-maturation-of-the-inner-ear
#7
Takushi Miyoshi, Taro Yamaguchi, Kiyokazu Ogita, Yasuko Tanaka, Ken-Ichi Ishibashi, Hiroaki Ito, Taisuke Kobayashi, Takayuki Nakagawa, Juichi Ito, Koichi Omori, Norio Yamamoto
Aquaporins (AQPs) are a family of small membrane proteins that transport water molecules across the plasma membrane along the osmotic gradient. Mammals express 13 subtypes of AQPs, including the recently reported "subcellular AQPs", AQP11 and 12. Each organ expresses specific subsets of AQP subtypes, and in the inner ear, AQPs are essential for the establishment and maintenance of two distinct fluids, endolymph and perilymph. To evaluate the contribution of AQPs during the establishment of inner ear function, we used quantitative reverse transcription polymerase chain reaction to quantify the expression levels of all known AQPs during the entire development and maturation of the inner ear...
December 21, 2016: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/27995510/mechanisms-of-global-cerebral-edema-formation-in-aneurysmal-subarachnoid-hemorrhage
#8
Erik G Hayman, Aaron Wessell, Volodymyr Gerzanich, Kevin N Sheth, J Marc Simard
A growing body of clinical literature emphasizes the impact of cerebral edema in early brain injury following aneurysmal subarachnoid hemorrhage (aSAH). Aneurysm rupture itself initiates global cerebral edema in up to two thirds of cases. Although cerebral edema is not a universal feature of aSAH, it portends a poor clinical course, with quantitative analysis revealing a direct correlation between cerebral edema and poor outcome, including mortality and cognitive deficits. Mechanistically, global cerebral edema has been linked to global ischemia at the time of aneurysm rupture, dysfunction of autoregulation, blood breakdown products, neuroinflammation, and hyponatremia/endocrine abnormalities...
December 19, 2016: Neurocritical Care
https://www.readbyqxmd.com/read/27994362/serological-markers-associated-with-neuromyelitis-optica-spectrum-disorders-in-south-india
#9
Lekha Pandit, Douglas Kazutoshi Sato, Sharik Mustafa, Toshiyuki Takahashi, Anitha D'Cunha, Chaithra Malli, Akshatha Sudhir, Kazuo Fujihara
BACKGROUND: Neuromyelitis optica spectrum disorders (NMOSDs) represent 20% of all demyelinating disorders in South India. No studies have determined the seroprevalence to both antibodies against aquaporin-4* and antimyelin oligodendrocyte glycoprotein antibody (anti-MOG+) in this population. OBJECTIVE: To identify and characterize seropositive patients for anti-aquaporin-4 antibody (anti-AQP4+) and anti-MOG+ in South India. MATERIALS AND METHODS: We included 125 consecutive patients (15 children) who were serologically characterized using live transfected cells to human M23-AQP4 or full-length MOG...
October 2016: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/27966604/endogenous-programmed-death-ligand-1-restrains-the-development-and-onset-of-sj%C3%B3-gren-s-syndrome-in-non-obese-diabetic-mice
#10
Jing Zhou, Jun-O Jin, Toshihisa Kawai, Qing Yu
Programmed death-ligand 1 (PD-L1) down-modulates various immune responses by engaging the co-inhibitory receptor programmed death-1. Expression of PD-L1 and programmed death-1 is elevated in the salivary glands of patients with Sjögren's syndrome (SS). The objective of this study is to define the role of endogenous PD-L1 in SS pathogenesis in non-obese diabetic (NOD) mouse model of this disease. We inhibited endogenous PD-L1 function by intraperitoneal administration of a blocking antibody to 6 week-old female NOD/ShiLtJ mice repeatedly during a 9-day period...
December 14, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27936193/occurrence-of-asymptomatic-acute-neuromyelitis-optica-spectrum-disorder-typical-brain-lesions-during-an-attack-of-optic-neuritis-or-myelitis
#11
Su-Hyun Kim, Jae-Won Hyun, AeRan Joung, Sang Hyun Lee, Ho Jin Kim
We aimed to investigate the frequency of asymptomatic acute brain MRI abnormalities accompanying optic neuritis (ON) or myelitis in neuromyelitis optica spectrum disorder (NMOSD) patients with aquaporin-4 antibodies (AQP4-Ab). We reviewed 324 brain MRI scans that were obtained during acute attacks of ON or myelitis, in 165 NMOSD patients with AQP4-Ab. We observed that acute asymptomatic NMOSD-typical brain lesions accompanied 27 (8%) acute attacks of ON or myelitis in 24 (15%) patients. The most common asymptomatic brain abnormalities included edematous corpus callosum lesions (n = 17), followed by lesions on the internal capsule and/or cerebral peduncle lesions (n = 9), periependymal surfaces of the fourth ventricle (n = 5), large deep white matter lesions (n = 4), periependymal cerebral lesions surrounding the lateral ventricles (n = 3), and hypothalamic lesions (n = 1)...
2016: PloS One
https://www.readbyqxmd.com/read/27932503/computational-modelling-of-epithelial-fluid-and-ion-transport-in-the-parotid-duct-after-transfection-of-human-aquaporin-1
#12
Shelley Fong, John A Chiorini, James Sneyd, Vinod Suresh
Previous studies have shown that localized delivery of the aquaporin-1 (AQP1) gene to the parotid duct can restore saliva flow in minipigs following irradiation-induced salivary hypofunction. The resulting flow rate and electrochemisty of secreted saliva contradicts current understanding of ductal fluid transport. We hypothesized that changes in expression of ion transport proteins have occurred following AQP1 transfection. We use a mathematical model of ion and fluid transport across the parotid duct epithelial cells to predict the expression profile of ion transporters that are consistent with the experimental measurements of saliva composition and secretion rates...
December 8, 2016: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/27921242/human-mesenchymal-stem-cells-from-adipose-tissue-differentiated-into-neuronal-or-glial-phenotype-express-different-aquaporins
#13
Rosanna Avola, Adriana Carol Eleonora Graziano, Giovanna Pannuzzo, Venera Cardile
Aquaporins (AQPs) are 13 integral membrane proteins that provide selective pores for the rapid movement of water and other uncharged solutes, across cell membranes. Recently, AQPs have been focused for their role in production, circulation, and homeostasis of the cerebrospinal fluid and their importance in several human diseases is becoming clear. This study investigated the time course (0, 14, and 28 days) of AQP1, 4, 7, 8, and 9 during the neural differentiation of human mesenchymal stem cells (MSCs) from adipose tissue (AT)...
December 5, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27885529/lack-of-aquaporin-9-reduces-brain-angiogenesis-and-exaggerates-neuronal-loss-in-the-hippocampus-following-intracranial-hemorrhage-in-mice
#14
Weiyang Ji, Jing Wang, Jie Xu, Xudong Zhao, Xing Xu, Xiaojie Lu
Intracranial hemorrhage (ICH) is a common subtype of stroke with high morbidity and mortality. However, few clinical therapies that can reduce ICH-induced brain injury and promote the recovery outcome in ICH patients are available to improve the recovery from ICH. Given that aquaporin 9 (AQP9) plays a critical role in brain edema after ischemic stroke and traumatic brain injury and is involved in the regulation of angiogenesis, we examined the role of AQP9 in preventing neuronal loss and in neovascularization in the dorsal hippocampus (DH) after ICH...
November 24, 2016: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/27817002/overexpression-of-aquaporin-1-is-a-prognostic-factor-for-biochemical-recurrence-in-prostate-adenocarcinoma
#15
Ji Y Park, GhilSuk Yoon
Aquaporins (AQP) are transmembrane proteins that provide channels for water and solutes, and some are involved in tumor progression and invasion. We evaluated the expression of AQP-1, AQP-3, and AQP-5 and their clinicopathological significance in prostate adenocarcinomas (PCA). Prostatectomy specimens (n = 99) were retrieved from the surgical pathology archives and clinicopathological data were obtained from the medical database at Kyungpook National University Hospital. Immunohistochemical staining for AQP-1, AQP-3, and AQP-5 was performed on tissue microarrays comprising paired malignant and benign prostatic tissues...
November 5, 2016: Pathology Oncology Research: POR
https://www.readbyqxmd.com/read/27793019/intravenous-administration-of-xenogenic-adipose-derived-mesenchymal-stem-cells-admsc-and-admsc-derived-exosomes-markedly-reduced-brain-infarct-volume-and-preserved-neurological-function-in-rat-after-acute-ischemic-stroke
#16
Kuan-Hung Chen, Chih-Hung Chen, Christopher Glenn Wallace, Chun-Man Yuen, Gour-Shenq Kao, Yi-Ling Chen, Pei-Lin Shao, Yung-Lung Chen, Han-Tan Chai, Kun-Chen Lin, Chu-Feng Liu, Hsueh-Wen Chang, Mel S Lee, Hon-Kan Yip
We tested the hypothesis that combined xenogenic (from mini-pig) adipose-derived mesenchymal stem cell (ADMSC) and ADMSC-derived exosome therapy could reduce brain-infarct zone (BIZ) and enhance neurological recovery in rat after acute ischemic stroke (AIS) induced by 50-min left middle cerebral artery occlusion. Adult-male Sprague-Dawley rats (n = 60) were divided equally into group 1 (sham-control), group 2 (AIS), group 3 [AIS-ADMSC (1.2×106 cells)], group 4 [AIS-exosome (100μg)], and group 5 (AIS-exosome-ADMSC)...
October 25, 2016: Oncotarget
https://www.readbyqxmd.com/read/27788793/tissue-expression-of-aquaporin-2-is-correlated-to-urine-output-and-allograft-function-in-sensitized-kidney-transplant-patients
#17
K Klein, S Rübenacker, S M Schaefer, L P Kihm, V Schwenger, S Macher-Goeppinger, P Schemmer, C Süsald, M Zeier, C Morath, L E Becker
BACKGROUND: Salt and water disturbances often occur during acute kidney allograft dysfunction that contribute to graft failure, but this condition has been poorly investigated in the alloreactivity setting. We evaluated the tissue expression of aquaporins (AQP1 and AQP2) and the epithelial sodium channel (ENAC) in kidney biopsy specimens from sensitized kidney transplant recipients. METHODS: Eighty-six biopsy specimens from 33 sensitized patients were divided into 3 groups according to clinical context: time-zero (n = 9), protocol (n = 9), and indication (n = 68)...
October 2016: Transplantation Proceedings
https://www.readbyqxmd.com/read/27777930/characterization-of-aqps-in-mouse-rat-and-human-colon-and-their-selective-regulation-by-bile-acids
#18
Jonathan Yde, Stephen Keely, Qi Wu, Johan F Borg, Natalia Lajczak, Aoife O'Dwyer, Peter Dalsgaard, Robert A Fenton, Hanne B Moeller
In normal individuals, the epithelium of the colon absorbs 1.5-2 l of water a day to generate dehydrated feces. However, in the condition of bile acid malabsorption (BAM), an excess of bile acids in the colon results in diarrhea. Several studies have attempted to address the mechanisms contributing to BAM induced by various bile acids. However, none have addressed a potential dysregulation of aquaporin (AQP) water channels, which are responsible for the majority of transcellular water transport in epithelial cells, as a contributing factor to the onset of diarrhea and the pathogenesis of BAM...
2016: Frontiers in Nutrition
https://www.readbyqxmd.com/read/27746040/expression-of-aquaporin-7-and-aquaporin-9-in-tanycyte-cells-and-choroid-plexus-during-mouse-estrus-cycle
#19
A Yaba, B Sozen, B Suzen, N Demir
Tanycytes are special ependymal cells located in the ventrolateral wall and floor of the third ventricle having processes extending nuclei that regulate reproductive functions and around of vessels in median eminance. The aquaporins (AQPs) are a family of transmembrane proteins that transport water and glycerol. AQP-7 and -9 are permeable to other small molecules as glycerol and therefore called aquaglyceroporins. In this study, we aimed to show localization of AQP-7 and -9 in epithelial cells of choroid plexus and tanycytes during female mouse estrus cycle...
October 13, 2016: Morphologie: Bulletin de L'Association des Anatomistes
https://www.readbyqxmd.com/read/27707708/collecting-duct-specific-knockout-of-nitric-oxide-synthase-3-impairs-water-excretion-in-a-sex-dependent-manner
#20
Yang Gao, Deborah Stuart, Jennifer S Pollock, Takamune Takahishi, Donald E Kohan
Nitric oxide (NO) inhibits collecting duct (CD) Na(+) and water reabsorption. Mice with CD-specific knockout (KO) of NO synthase 1 (NOS1) have salt-sensitive hypertension. In contrast, the role of NOS3 in CD salt and water reabsorption is unknown. Mice with CD NOS3 KO were generated with loxP-flanked exons 9-12 (encodes the calmodulin binding site) of the NOS3 gene and the aquaporin-2 promoter-Cre transgene. There were no differences between control and CD NOS3 KO mice, irrespective of sex, in food intake, water intake, urine volume, urinary Na(+) or K(+) excretion, plasma renin concentration, blood pressure, or pulse during 7 days of normal (0...
November 1, 2016: American Journal of Physiology. Renal Physiology
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