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American Journal of Physiology. Cell Physiology

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https://www.readbyqxmd.com/read/29141923/src-family-kinase-inhibitors-blunt-the-pacap-induced-pac1-receptor-endocytosis-phosphorylation-of-erk-and-increase-in-cardiac-neuron-excitability
#1
John D Tompkins, Todd A Clason, Thomas R Buttolph, Beatrice M Girard, Anne K Linden, Jean C Hardwick, Laura A Merriam, Victor May, Rodney L Parsons
Pituitary adenylate cyclase activating polypeptide (PACAP, Adcyap1) activation of PAC1 receptors (Adcyap1r1) significantly increases excitability of guinea pig cardiac neurons. This modulation of excitability is mediated in part by plasma membrane G protein-dependent activation of adenylyl cyclase and downstream signaling cascades. However, additional mechanisms responsible for the enhanced excitability are activated following internalization of the PAC1 receptor and endosomal signaling. Src family kinases play critical roles mediating endocytosis of many trophic factor and G-protein coupled receptors...
November 15, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29141922/trpc6-contributes-to-lps-induced-inflammation-through-erk1-2-and-p38-pathway-in-bronchial-epithelial-cells
#2
Li-Fen Zhou, Qing-Zi Chen, Chun-Tao Yang, Zhao-Di Fu, Shen-Ting Zhao, Yan Chen, Shu-Ni Li, Li Liao, Yu-Bo Zhou, Jian-Rong Huang, Jian-Hua Li
Transient receptor potential canonical (TRPC) channels are currently an emerging target for airway disorders. Recent evidences have indicated that TRPC6 as a member of the TRPC family plays an important role in airway inflammation, but its precise function in bronchial epithelial cells remains unclear. The aim of this study was to investigate the role of TRPC6 in TLR4-mediated inflammation in human bronchial epithelial cells stimulated by endotoxin (lipopolysaccharide, LPS). Hyp9 is a simplified phloroglucinol derivative of Hyperforin which highly selective activates TRPC6 channels...
November 15, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29141921/microrna-574-suppresses-oocyte-maturation-via-targeting-hyaluronan-synthase-2-in-porcine-cumulus-cells
#3
Bo Pan, Derek Toms, Julang Li
MicroRNAs (miRNAs) have been established as important regulators of gene expression in the mammalian ovary. A previous screen of small RNA in the porcine ovary identified the down regulation of miR-574 during oocyte maturation, although its role during this process was not established. Here, we found that miR-574 directly targets the transcript for hyaluron synthase 2 protein (HAS2), a key enzyme in the production of extracellular matrix by the surrounding cumulus cells. Inhibiting this miRNA during in vitro maturation (IVM) increased HAS2 levels along with several markers of oocyte quality...
November 15, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29141920/parathyroid-hormone-related-protein-modulates-mice-mesangial-cells-inflammation-and-blunts-apoptosis-by-enhancing-cox-2-expression
#4
Mazène Hochane, Denis Raison, Catherine Coquard, Claire Béraud, Audrey Bethry, Sabrina Danilin, Thierry Massfelder, Mariette Barthelmebs
Mesangial cell (MC) injury is a prominent feature of glomerulonephritis. Activated MC secretes inflammatory mediators which induce cell apoptosis. Parathyroid hormone-related peptide (PTHrP) is a locally active cytokine that enhances cell survival and is upregulated by pro-inflammatory factors in many cell types. The aim of this study was to analyze the regulation of PTHrP expression by inflammatory cytokines, and to evaluate whether PTHrP itself acts as a pro-inflammatory and/or survival factor on male murine MC in primary culture...
November 15, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29118028/dynamic-functional-contribution-of-the-water-channel-aqp5-to-the-water-permeability-of-peripheral-lens-fiber-cells
#5
Rosica S Petrova, Kevin F Webb, Ehsan Vaghefi, Kerry Walker, Kevin L Schey, Paul J Donaldson
Although the functionality of the lens water channels, AQP1 (epithelium) and AQP0 (fiber cells), are well established less is known about the role of AQP5 in the lens. Since in other tissues AQP5 functions as a regulated water channel with a water permeability (PH2O) some 20x higher than AQP0, AQP5 could function to modulate PH2O in lens fiber cells. To test this possibility a fluorescence dye dilution assay was used to calculate the relative PH2O of epithelial cells and fiber membrane vesicles isolated from either the mouse or rat lens, in the absence and presence of HgCl2 - an inhibitor of AQP1 and AQP5...
November 8, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29118027/heterogeneity-of-signal-transduction-by-na-k-atpase-%C3%AE-isoforms-role-of-src-interaction
#6
Hui Yu, Xiaoyu Cui, Jue Zhang, Joe X Xie, Moumita Banerjee, Sandrine V Pierre, Zijian Xie
Of the four Na/K-ATPase α isoforms, the ubiquitous α1 Na/K-ATPase possesses both ion transport and Src-dependent signaling functions. Mechanistically, we have identified two putative pairs of domain interactions between α1 Na/K-ATPase and Src that are critical for α1 signaling. Our subsequent report that α2 Na/K-ATPase lacks these putative Src-binding sites and fails to carry on Src-dependent signaling further supported our proposed model of direct interaction between α1 Na/K-ATPase and Src, but fell short of providing evidence for a causative role...
November 8, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29118026/carbon-monoxide-in-lung-cell-physiology-and-disease
#7
Stefan W Ryter, Kevin C Ma, Augustine M K Choi
Carbon monoxide (CO) is an endogenously produced gas that has gained recognition as a biological signal transduction effector with properties similar, but not identical, to that of nitric oxide (NO). CO, which binds primarily to heme iron, may activate the hemoprotein guanylate cyclase (sGC), although with lower potency than NO. Furthermore, CO can modulate the activities of several cellular signaling molecules such as p38 MAPK, ERK1/2, JNK, AKT, NF-κB, and others. Emerging studies suggest that mitochondria, the energy-generating organelle of cells, represent a key target of CO action in eukaryotes...
November 8, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29092820/ajp-cell-physiology-begins-landmark-reviews-in-cell-physiology
#8
Eric Delpire, Kirk L Hamilton, Thomas J Hawke, Jeffrey S Isenberg, Sophie Lotersztajn, Jason X-J Yuan, Josephine C Adams
Not applicable for an Editorial.
November 1, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29092819/protein-arginine-methyltransferase-expression-localization-and-activity-during-disuse-induced-skeletal-muscle-plasticity
#9
Derek W Stouth, Alexander Manta, Vladimir Ljubicic
Protein arginine methyltransferase 1 (PRMT1), PRMT4, and PRMT5 catalyze the methylation of arginine residues on target proteins. Previous work suggests that these enzymes regulate skeletal muscle plasticity. However, the function of PRMTs during disuse-induced muscle remodelling is unknown. The purpose of our study was to determine whether denervation-induced muscle disuse alters PRMT expression and activity in skeletal muscle, as well as to contextualize PRMT biology within the early disuse-evoked events that precede atrophy, which remain largely undefined...
November 1, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29070492/vitamin-d-deficiency-infertility-and-neurodevelopmental-diseases-attention-deficit-hyperactivity-disorder-autism-and-schizophrenia
#10
Michael J Berridge
The process of development depends on a progressive sequence of events that are carefully orchestrated by a number of signalling systems. Alteration in these signalling events results in infertility and neurodevelopmental diseases such as attention deficit hyperactivity disorder (ADHD), autism spectrum disorders (ASD) and schizophrenia. A prominent role throughout development beginning at fertilization and continuing through early development, implantation and organ differentiation such as heart and brain development is regulated by Ca(2+) signalling...
October 25, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29070491/rhoa-increases-asic1a-plasma-membrane-localization-and-calcium-influx-in-pulmonary-arterial-smooth-muscle-cells-following-chronic-hypoxia
#11
Lindsay M Herbert, Thomas C Resta, Nikki L Jernigan
Increases in pulmonary arterial smooth muscle cell (PASMC) intracellular Ca(2+) levels and enhanced RhoA/Rho kinase-dependent Ca(2+) sensitization are key determinants of PASMC contraction, migration, and proliferation accompanying the development of hypoxic pulmonary hypertension. We have previously shown acid sensing ion channel 1a (ASIC1a)-mediated Ca(2+) entry in PASMC is an important constituent of the active vasoconstriction, vascular remodeling, and right ventricular hypertrophy associated with hypoxic pulmonary hypertension...
October 25, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29070490/the-diverse-cellular-responses-of-the-choroid-plexus-during-infection-of-the-central-nervous-system
#12
Alexa N Lauer, Tobias Tenenbaum, Horst Schroten, Christian Schwerk
The choroid plexus (CP) is responsible for the production of a large amount of the cerebrospinal fluid (CSF). As a highly vascularized structure, the CP also presents a significant frontier between the blood and the central nervous system (CNS). To seal this border, the epithelium of the CP forms the blood-CSF barrier (BCSFB), one of the most important barriers separating the CNS from the blood. During the course of infectious disease, cells of the CP can experience interactions with intruding pathogens, especially when the CP is used as gateway for entry into the CNS...
October 25, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29046294/local-ca-2-coupling-between-mitochondria-and-sarcoplasmic-reticulum-following-depolarization-in-guinea-pig-urinary-bladder-smooth-muscle-cells
#13
Hisao Yamamura, Keisuke Kawasaki, Sou Inagaki, Yoshiaki Suzuki, Yuji Imaizumi
Spatiotemporal changes in cytosolic Ca(2+) concentration ([Ca(2+)]c) trigger a number of physiological functions in smooth muscle cells (SMCs). We previously imaged Ca(2+)-induced Ca(2+) release following membrane depolarization as local Ca(2+) transients, Ca(2+) hotspots, in subplasmalemmal regions. In this study, the physiological significance of mitochondria on local Ca(2+) signaling was examined. Cytosolic and mitochondrial Ca(2+) images following depolarization or action potentials were recorded in single SMCs from the guinea pig urinary bladder using a fast-scanning confocal fluorescent microscope...
October 18, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29046293/exercise-induces-tfeb-expression-and-activity-in-skeletal-muscle-in-a-pgc-1%C3%AE-dependent-manner
#14
Avigail T Erlich, Diane M Brownlee, Kaitlyn Beyfuss, David A Hood
The mitochondrial network in muscle is controlled by the opposing processes of mitochondrial biogenesis and mitophagy. The coactivator PGC-1α regulates biogenesis, while the transcription of mitophagy-related genes is controlled by transcription factor EB (TFEB). PGC-1α activation is induced with exercise, however the effect of exercise on TFEB is not fully known. We investigated the interplay between PGC-1α and TFEB on mitochondria in response to acute contractile activity in C2C12 myotubes, and following exercise in WT and PGC-1α KO mice...
October 18, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29046292/identification-of-ut-a1-and-aqp2-interacting-proteins-in-rat-inner-medullary-collecting-duct
#15
Chung-Lin Chou, Gloria Hwang, Daniel J Hageman, Lichy Han, Prashasti Agrawal, Trairak Pisitkun, Mark A Knepper
The urea channel UT-A1 and the water channel aquaporin-2 (AQP2) mediate vasopressin-regulated transport in the renal inner medullary collecting duct (IMCD). To identify the proteins that interact with UT-A1 and AQP2 in native rat IMCD cells, we carried out chemical cross-linking followed by detergent solubilization, immunoprecipitation, and LC-MS/MS analysis of the immunoprecipitated material. The analyses revealed 133 UT-A1-interacting proteins and 139 AQP2-interacting proteins, each identified in multiple replicates...
October 18, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29021196/nf-%C3%AE%C2%BAb-dependent-upregulation-of-pro-renin-receptor-mediates-high-nacl-induced-apoptosis-in-mouse-inner-medullary-collecting-duct-cells
#16
Jiahui Su, Xiyang Liu, Chuanming Xu, Xiaohan Lu, Fei Wang, Hui Fang, Aihua Lu, Qixiang Qiu, Chunling Li, Tianxin Yang
(Pro)renin receptor (PRR), a new component of renin-angiotensin system (RAS), has emerged as a new regulator of collecting duct function. The present study was designed to investigate the role of PRR in high salt-induced apoptosis in cultured mouse inner medullary collecting duct cells, mIMCD-K2 cells. Exposure to high NaCl at 550 mOsm/kg H2O increased PRR protein abundance so did mannitol, sodium gluconate or choline chloride. This was accompanied with upregulation of phosphorylated NF-κB p65 protein abundance...
October 11, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28978526/loss-of-inversin-decreases-transepithelial-sodium-transport-in-murine-renal-cells
#17
Nalini H Kulkarni, Rosamund C Smith, Bonnie L Blazer-Yost
Type II nephronophthisis (NPHP2) is an autosomal recessive renal cystic disorder characterized by mutations in the inversin gene. Humans and mice with mutations in inversin have enlarged cystic kidneys that may be due to fluid accumulation resulting from altered ion transport. To address this, transepithelial ion transport was measured in shRNA mediated inversin-depleted mouse cortical collecting duct (mCCD) cells. Loss of inversin decreased the basal ion flux in mCCD cells compared to controls. Depletion of inversin decreased vasopressin-induced Na+ absorption, but did not alter Cl- secretion by mCCD cells...
October 4, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28978525/ampk-klf2-signaling-pathway-mediates-the-proangiogenic-effect-of-erythropoietin-in-endothelial-colony-forming-cells
#18
Dawei Wang, Yimeng Song, Jianshu Zhang, Wei Pang, Xian Wang, Yi Zhu, Xiaoxia Li
Endothelial colony forming cells (ECFCs) were proved to take part in post-natal vasculogenesis and injury repair. The angiogenic properties of ECFCs could be influenced by various cytokines, chemokines, and growth factors. Erythropoietin (EPO) is a promising cytokine participating in angiogenesis. However, the mechanisms for EPO's proangiogenic effect still remain largely elusive. Here, we investigated the role of AMP-activated protein kinase (AMPK)-Krüppel-like factor 2 (KLF2) signaling pathway in the proangiogenic effect of EPO in ECFCs...
October 4, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28978524/ring-finger-protein-113a-regulates-c-x-c-chemokine-receptor-type-4-stability-and-signaling
#19
Travis Lear, Sarah R Dunn, Alison C McKelvey, Aazrin Mir, John Evankovich, Bill B Chen, Yuan Liu
As an alpha-chemokine receptor specific for stromal-derived-factor-1 (SDF-1, also called CXCL12), CXCR4 plays a vital role in chemotactically attracting lymphocytes during inflammation. CXCR4 also regulates HIV infection due to its role as one of the chemokine co-receptors for HIV entry into CD4+ T cells. Chemokine receptors and their signaling pathways have been shown to be regulated by the process of ubiquitination, a post-translational modification, guided by ubiquitin E3 ligases, which covalently links ubiquitin chains to lysine residues within target substrates...
October 4, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28978523/recombinant-sclerostin-antagonises-effects-of-ex-vivo-mechanical-loading-in-trabecular-bone-and-increases-osteocyte-lacunar-size
#20
Masakazu Kogawa, Kamarul A Khalid, Asiri R Wijenayaka, Renee T Ormsby, Andreas Evdokiou, Paul H Anderson, David M Findlay, Gerald J Atkins
Sclerostin (SCL) has emerged as an important regulator of bone mass. We have shown that SCL can act by targeting late osteoblasts/osteocytes to inhibit bone mineralisation and to upregulate osteocyte expression of catabolic factors, resulting in osteocytic osteolysis. Here we sought to examine the effect of exogenous sclerostin on osteocytes in trabecular bone mechanically loaded ex vivo. Bovine trabecular bone cores, with bone marrow removed, were inserted into individual chambers and subjected to daily episodes of dynamic loading...
October 4, 2017: American Journal of Physiology. Cell Physiology
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