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Connexin 43

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https://www.readbyqxmd.com/read/29777691/improving-electrical-properties-of-ipsc-cardiomyocytes-by-enhancing-cx43-expression
#1
Valentin Sottas, Carl-Mattheis Wahl, Mihnea C Trache, Michael Bartolf-Kopp, Sidney Cambridge, Markus Hecker, Nina D Ullrich
The therapeutic potential of induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) is limited by immature functional features including low impulse propagation and reduced cell excitability. Key players regulating electrical activity are voltage-gated Na+ channels (Nav 1.5) and gap junctions built from connexin-43 (Cx43). Here we tested the hypothesis that enhanced Cx43 expression increases intercellular coupling and influences excitability by modulating Nav 1.5. Using transgenic approaches, Cx43 and Nav 1...
May 16, 2018: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/29777058/gpr40-is-a-low-affinity-epoxyeicosatrienoic-acid-receptor-in-vascular-cells
#2
Sang Kyu Park, Anja Herrnreiter, Sandra L Pfister, Kathryn M Gauthier, Benjamin A Falck, John R Falck, William B Campbell
Endothelium-derived epoxyeicosatrienoic acids (EETs) have numerous vascular activities mediated by G protein--coupled receptors. Long-chain free fatty acids and EETs activate GPR40, prompting us to investigate the role of GPR40 in some vascular EET activities. 14,15-EET, 11,12-EET, arachidonic acid, and the GPR40 agonist GW9508 increase intracellular calcium concentrations in human GPR40-overexpressing HEK293 cells (EC50 = 0.58 ± 0.08 μM, 0.91 ± 0.08 μM, 3.9 ± 0.06 μM and 19 ± 0.37 nM, respectively)...
May 18, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29763908/connexin-43-modulates-osteogenic-differentiation-of-bone-marrow-stromal-cells-through-gsk-3beta-beta-catenin-signaling-pathways
#3
Fei-Xiang Lin, Gui-Zhou Zheng, Bo Chang, Rong-Chun Chen, Qi-Hao Zhang, Peng Xie, Da Xie, Guo-Yong Yu, Qin-Xiao Hu, De-Zhong Liu, Shi-Xin Du, Xue-Dong Li
BACKGROUND/AIMS: Bone marrow stromal cells (BMSCs) are multipotent precursors that give rise to osteoblasts, and contribute directly to bone formation. Connexin 43 (Cx43) is the most ubiquitous gap junction protein expressed in bone cell types, and plays crucial roles in regulating intercellular signal transmission for bone development, differentiation and pathology. However, the precise role and mechanism of Cx43 in BMSCs are less known. Here, we investigate the function of Cx43 in osteogenic differentiation of BMSCs in vitro...
May 10, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29751831/intravenous-injection-of-allogeneic-umbilical-cord-derived-multipotent-mesenchymal-stromal-cells-reduces-the-infarct-area-and-ameliorates-cardiac-function-in-a-porcine-model-of-acute-myocardial-infarction
#4
Meikuang Lim, Weiqiang Wang, Lu Liang, Zhi-Bo Han, Zongjin Li, Jie Geng, Meng Zhao, Honghong Jia, Jie Feng, Zhe Wei, Baoquan Song, Jiemin Zhang, Jun Li, Tianwen Liu, Fan Wang, Ting Li, Jianming Li, Yihu Fang, Jianhua Gao, Zhongchao Han
BACKGROUND: Multipotent mesenchymal stromal cell (MSC) therapy has been widely recognized as a feasible strategy for regenerating injured myocardial tissue. However, little is known about the efficacy of intravenous injection of allogeneic umbilical cord (UC) MSCs in preclinical models of porcine myocardial infarction. METHODS: Different dosages of allogeneic UC-MSCs or the vehicle [phosphate-buffered saline (PBS)] were delivered intravenously into an acute myocardial infarction (AMI) porcine model twice after coronary ligation...
May 11, 2018: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29750972/inhibition-of-cx43-gap-junction-uncoupling-prevents-high-glucose-induced-apoptosis-and-reduces-excess-cell-monolayer-permeability-in-retinal-vascular-endothelial-cells
#5
Dongjoon Kim, Ulrik Mouritzen, Bjarne Due Larsen, Sayon Roy
The aim of this study was to investigate whether inhibition of connexin 43 gap junction-uncoupling is sufficient to prevent retinal vascular cell loss under high glucose condition and reduce cell monolayer permeability. Rat retinal endothelial cells were grown for 3, 5, and 7 days in normal (5 mM) or high glucose (30 mM) medium; in parallel, cells grown in high glucose medium were exposed for 3, 5, and 7 days to 100 nM danegaptide, which stabilizes connexin 43-mediated cell coupling. Additionally, cells grown in normal medium were treated with a connexin 43 blocker as a negative control...
May 8, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29748463/protein%C3%A2-protein-interactions-with-connexin-43-regulation-and-function
#6
REVIEW
Paul L Sorgen, Andrew J Trease, Gaelle Spagnol, Mario Delmar, Morten S Nielsen
Connexins are integral membrane building blocks that form gap junctions, enabling direct cytoplasmic exchange of ions and low-molecular-mass metabolites between adjacent cells. In the heart, gap junctions mediate the propagation of cardiac action potentials and the maintenance of a regular beating rhythm. A number of connexin interacting proteins have been described and are known gap junction regulators either through direct effects (e.g., kinases) or the formation of larger multifunctional complexes (e.g., cytoskeleton scaffold proteins)...
May 10, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29747701/astrocyte-remodeling-without-gliosis-precedes-optic-nerve-axonopathy
#7
Melissa L Cooper, John W Collyer, David J Calkins
Astroyctes serve myriad functions but are especially critical in white matter tracts, where energy-demanding axons propagate action potentials great distances between neurons. Axonal dependence on astrocytes for even normal function accentuates the critical role astrocytes serve during disease. In glaucoma, the most common optic neuropathy, sensitivity to intraocular pressure (IOP) challenges RGC axons early, including degradation of anterograde transport to the superior colliculus (SC). Astrocyte remodeling presages overt axon degeneration in glaucoma and thus may present a therapeutic opportunity...
May 10, 2018: Acta Neuropathologica Communications
https://www.readbyqxmd.com/read/29742489/renal-denervation-effects-on-myocardial-fibrosis-and-ventricular-arrhythmias-in-rats-with-ischemic-cardiomyopathy
#8
Bin Zhang, Xiaorong Li, Chu Chen, Wanying Jiang, Dasheng Lu, Qian Liu, Kai Wang, Yuhao Yan, Zhixin Jiang, Jie Geng, Hai Xu, Qijun Shan
BACKGROUND/AIMS: To investigate the impact of renal denervation (RDN) on myocardial fibrosis and ventricular arrhythmias (VAs) in rats with ischemic cardiomyopathy. METHODS: An ischemic cardiomyopathy model was reproduced with myocardial infarction (MI) in adult Sprague-Dawley male rats. The RDN/Sham-RDN procedure was performed at 2 weeks after MI. Sham-MI and sham-RDN rats served as the control group. At 4 weeks after RDN, programmed electrical stimulation (PES) was used to induce VAs, including ventricular tachycardia and ventricular fibrillation, in all 3 groups (MI+RDN, MI, and control groups)...
May 5, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29739982/overexpression-of-cx43-in-cells-of-the-myocardial-scar-correction-of-post-infarct-arrhythmias-through-heterotypic-cell-cell-coupling
#9
Wilhelm Roell, Alexandra M Klein, Martin Breitbach, Torsten S Becker, Ashish Parikh, Jane Lee, Katrin Zimmermann, Shaun Reining, Beth Gabris, Annika Ottersbach, Robert Doran, Britta Engelbrecht, Miriam Schiffer, Kenichi Kimura, Patricia Freitag, Esther Carls, Caroline Geisen, Georg D Duerr, Philipp Sasse, Armin Welz, Alexander Pfeifer, Guy Salama, Michael Kotlikoff, Bernd K Fleischmann
Ventricular tachycardia (VT) is the most common and potentially lethal complication following myocardial infarction (MI). Biological correction of the conduction inhomogeneity that underlies re-entry could be a major advance in infarction therapy. As minimal increases in conduction of infarcted tissue markedly influence VT susceptibility, we reasoned that enhanced propagation of the electrical signal between non-excitable cells within a resolving infarct might comprise a simple means to decrease post-infarction arrhythmia risk...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29717772/connexin-43-reduces-susceptibility-to-sympathetic-atrial-fibrillation
#10
Beibei Luo, Yifei Yan, Zhiyu Zeng, Zhengnan Zhang, Haide Liu, Hao Liu, Jinyi Li, Weiqiang Huang, Jiangtao Wu, Yan He
Atrial fibrillation (AF) is the most common arrhythmia reported in clinical practice. Connexin 43 (Cx43) is a member of the connexin protein family, which serves important roles in signal transduction in vivo. The aim of the present study was to investigate the role of Cx43 in the induction and maintenance of atrial fibrillation by using an animal model of sympathomimetic atrial fibrillation. Cx43 was successfully knocked down in the myocardium with gene‑specific small interfering (si)RNA via lentiviral infection...
April 30, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29707682/expressional-patterns-of-connexin-isoforms-in-the-rat-epididymal-fat-during-postnatal-development
#11
Ki-Ho Lee, Nan Hee Kim
In the multicellular tissue, cell-cell interaction is important for a precise control of its function. The exchange of signaling molecules between adjacent cells via connexon allows the functional harmony of cells in the tissue. The present research was to determine the presence and expressional patterns of connexin ( Cx ) isoforms in the rat epididymal fat during postnatal development using quantitative real-time polymerase chain reaction (PCR) analysis. Of 13 Cx isoforms examined, expression of 11 Cx isoforms in the epididymal fat during postnatal development was detected...
March 2018: Balsaeng'gwa Saengsig
https://www.readbyqxmd.com/read/29698813/neuropathic-keratopathy
#12
REVIEW
Harminder S Dua, Dalia G Said, Elisabeth M Messmer, Maurizio Rolando, Jose M Benitez-Del-Castillo, Parwez N Hossain, Alex J Shortt, Gerd Gerling, Mario Nubile, Francisco C Figueiredo, Saaeha Rauz, Leonardo Mastropasqua, Paolo Rama, Christophe Baudouin
Neurotrophic Keratopathy (NK) refers to a condition where corneal epitheliopathy leading to frank epithelial defect with or without stromal ulceration (melting) is associated with reduced or absent corneal sensations. Sensory nerves serve nociceptor and trophic functions, which can be affected independently or simultaneously. Loss of trophic function and consequent epithelial breakdown exposes the stroma making it susceptible to enzymatic degradation. Nerve pathology can range from attrition to aberrant re-generation with corresponding symptoms from anaesthesia to hyperaesthesia/allodynia...
April 23, 2018: Progress in Retinal and Eye Research
https://www.readbyqxmd.com/read/29697878/connexin-43-coupling-in-bovine-cumulus-cells-during-the-follicular-growth-phase-and-its-relationship-to-in-vitro-embryo-outcomes
#13
Casey C Read, Gabby Willhelm, Paul W Dyce
Gap junctional coupling between cumulus cells is required for oocytes to reach developmental competence. Multiple connexins, which form these gap junctions, have been found within the ovarian follicles of several species including bovine. The aim of this study was to determine the role of connexin 43 (CX43) and its relationship to embryo development, following in vitro fertilization (IVF). Cumulus-oocyte-complexes (COCs) were obtained from abattoir sourced, mixed breed, bovine ovaries. COCs were isolated from follicles ranging from 2-5mm in size, representing the preselected follicle pool...
April 26, 2018: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/29673083/fine-particle-matter-disrupts-the-blood-testis-barrier-by-activating-tgf-%C3%AE-3-p38-mapk-pathway-and-decreasing-testosterone-secretion-in-rat
#14
Jianhui Liu, Lihua Ren, Jialiu Wei, Jin Zhang, Yupeng Zhu, Xiangyang Li, Li Jing, Junchao Duan, Xianqing Zhou, Zhiwei Sun
Fine particle matter (PM) is correlated with male reproductive dysfunction in animals and humans, but the underlying mechanisms remain unknown. To investigate the toxic mechanism of PM, 32 male Sprague-Dawley (SD) rats were exposed to saline or PM2.5 with the doses of 1.8, 5.4, and 16.2 mg/kg.b.w. via intratracheal instillation, respectively, one time every 3 days, in total times for 30 days. Sperm concentration, hormone level, the expressions of BTB-associated protein and the mitogen-activated protein kinase (MAPK) pathway, tumor necrosis factor α and transforming growth factor β3 levels were detected...
April 19, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29669327/effects-of-baicalin-on-diabetic-cardiac-autonomic-neuropathy-mediated-by-the-p2y12-receptor-in-rat-stellate-ganglia
#15
Xuan Sheng, Jiayue Wang, Jingjing Guo, Yurong Xu, Huaide Jiang, Chaoran Zheng, Zixi Xu, Yuanruohan Zhang, Hongyu Che, Shangdong Liang, Gaochun Zhu, Guilin Li
BACKGROUND/AIMS: Chronic diabetic hyperglycemia can damage various of organ systems and cause serious complications. Although diabetic cardiac autonomic neuropathy (DCAN) is the primary cause of death in diabetic patients, its pathogenesis remains to be fully elucidated. Baicalin is a flavonoid extracted from Scutellaria baicalensis root and has antibacterial, diuretic, anti-inflammatory, anti- metamorphotic, and antispasmodic effects. Our study explored the effects of baicalin on enhancing sympathoexcitatory response induced by DCAN via the P2Y12 receptor...
April 13, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29664174/up-regulated-cx43-phosphorylation-at-ser368-prolongs-qrs-duration-in-myocarditis
#16
Chunlian Zhong, He Chang, Yang Wu, Li Zhou, Yan Wang, Mingyan Wang, Peng Wu, Zhi Qi, Jun Zou
Prolongation of QRS duration in electrocardiogram is one of the risk factors for morbidity and mortality in many kinds of cardiac diseases. However, its molecular mechanism is unknown. In this study, utilizing experimental autoimmune myocarditis (EAM) as a disease model, we show that the prolongation of QRS duration is accompanied by elevated phosphorylation of connexin 43 (Cx43) at Ser368 (pS 368 Cx43). In cultured cells, inflammatory cytokine IL-1β activates p38 MAPK to up-regulate pS 368 Cx43 and impairs cell-to-cell communication...
April 17, 2018: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/29643394/author-correction-kanglaite-sensitizes-colorectal-cancer-cells-to-taxol-via-nf-%C3%AE%C2%BA%C3%AE-inhibition-and-connexin-43-upregulation
#17
Yijia Wang, Chunze Zhang, Shiwu Zhang, Zhenying Zhao, Jiawen Wang, Jiali Song, Yue Wang, Jun Liu, Shaobin Hou
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.
April 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29642568/irradiation-induced-cardiac-connexin-43-and-mir-21-responses-are-hampered-by-treatment-with-atorvastatin-and-aspirin
#18
Csilla Viczenczova, Branislav Kura, Tamara Egan Benova, Chang Yin, Rakesh C Kukreja, Jan Slezak, Narcis Tribulova, Barbara Szeiffova Bacova
Radiation of the chest during cancer therapy is deleterious to the heart, mostly due to oxidative stress and inflammation related injury. A single sub-lethal dose of irradiation has been shown to result in compensatory up-regulation of the myocardial connexin-43 (Cx43), activation of the protein kinase C (PKC) signaling along with the decline of microRNA (miR)-1 and an increase of miR-21 levels in the left ventricle (LV). We investigated whether drugs with antioxidant, anti-inflammatory or vasodilating properties, such as aspirin, atorvastatin, and sildenafil, may affect myocardial response in the LV and right ventricle (RV) following chest irradiation...
April 10, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29626091/the-ubiquitin-specific-protease-usp8-deubiquitinates-and-stabilizes-cx43
#19
Jian Sun, Qianwen Hu, Hong Peng, Cheng Peng, Liheng Zhou, Jinsong Lu, Chuanxin Huang
Connexin 43 (Cx43, also known as GJA1), is the most ubiquitously expressed connexin isoform in mammalian tissues. It forms intercellular gap junction (GJ) channels, enabling adjacent cells to communicate both electrically and metabolically. Cx43 is a short-lived protein which can be quickly degraded by the ubiquitin-dependent proteasomal, endolysosomal and autophagosomal pathways. Here, we report that the ubiquitin-specific peptidase 8 (USP8) interacts with and deubiquitinates Cx43. USP8 reduces both multiple monoubiquitination and polyubiquitination of Cx43 to prevent autophagy-mediated degradation...
April 6, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29623602/inhibition-of-astrocyte-connexin-43-channels-facilitates-the-differentiation-of-oligodendrocyte-precursor-cells-under-hypoxic-conditions-in-vitro
#20
Qiong Wang, Zhen Wang, Yeye Tian, Huaqiu Zhang, Yongkang Fang, Zhiyuan Yu, Wei Wang, Minjie Xie, Fengfei Ding
Oligodendrocyte precursor cells (OPCs) proliferation and differentiation are essential for remyelination after white matter injury. Astrocytes could promote oligodendrogenesis after white matter damage whereas the underlying mechanisms are unknown. In this study, the role of astrocytic connexin43 (Cx43) hemichannels involved in OPC proliferation and differentiation in chronic hypoxia was evaluated. In an astrocyte-OPC co-culture chronic hypoxia model, OPCs became proliferative but failed to mature into oligodendrocytes...
April 5, 2018: Journal of Molecular Neuroscience: MN
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