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Gap junction intercellular communication

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https://www.readbyqxmd.com/read/28098880/the-role-of-gap-junctions-in-inflammatory-and-neoplastic-disorders-review
#1
Pui Wong, Victoria Laxton, Saurabh Srivastava, Yin Wah Fiona Chan, Gary Tse
Gap junctions are intercellular channels made of connexin proteins, mediating both electrical and biochemical signals between cells. The ability of gap junction proteins to regulate immune responses, cell proliferation, migration, apoptosis and carcinogenesis makes them attractive therapeutic targets for treating inflammatory and neoplastic disorders in different organ systems. Alterations in gap junction profile and expression levels are observed in hyperproliferative skin disorders, lymphatic vessel diseases, inflammatory lung diseases, liver injury and neoplastic disorders...
January 17, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28096472/myosin-vi-facilitates-connexin-43-gap-junction-accretion
#2
Bennett Waxse, Prabuddha Sengupta, Geoffrey G Hesketh, Jennifer Lippincott-Schwartz, Folma Buss
In this study, we demonstrate myosin VI enrichment at Cx43 gap junctions in heart tissue, primary cardiomyocytes and cell culture models. The loss of myosin VI via siRNA-mediated knock down or isolation of primary cardiac tissue and fibroblasts from the myosin VI-null mouse results in reduced GJ plaque size with a concomitant reduction in intercellular communication as shown by FRAP and a new method of selective calcein administration. Analysis of the molecular role of myosin VI in Cx43 trafficking indicates that myosin VI is dispensable in the delivery of Cx43 to the cell surface and connexon movement in the plasma membrane...
January 17, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28077322/a-protein-kinase-a-ezrin-complex-regulates-connexin-43-gap-junction-communication-in-liver-epithelial-cells
#3
Aleksandra R Dukic, Linda Hofstad Haugen, Guillaume Pidoux, Edward Leithe, Oddmund Bakke, Kjetil Taskén
Communication between adjacent cells can occur via gap junctions (GJ) composed of connexin (Cx) hexamers that allow passage of small molecules. One of the most widely and highly expressed Cxs in human tissues is Cx43, shown to be regulated through phosphorylation by several kinases including PKA. Ezrin is a membrane associated protein that can serve as an A-kinase anchoring protein (AKAP) and hold an anchored pool of PKA. Here, we used the liver epithelial cell line IAR20, which expresses Cx43 as the predominant GJ protein, to test the hypothesis that Ezrin may associate with Cx43 in cell types that form stable GJs and serve as an AKAP...
January 8, 2017: Cellular Signalling
https://www.readbyqxmd.com/read/28060274/gap-junctional-intercellular-communication-a-functional-biomarker-to-assess-adverse-effects-of-toxicants-and-toxins-and-health-benefits-of-natural-products
#4
Brad L Upham, Iva Sovadinová, Pavel Babica
This protocol describes a scalpel loading-fluorescent dye transfer (SL-DT) technique that measures intercellular communication through gap junction channels, which is a major intercellular process by which tissue homeostasis is maintained. Interruption of gap junctional intercellular communication (GJIC) by toxicants, toxins, drugs, etc. has been linked to numerous adverse health effects. Many genetic-based human diseases have been linked to mutations in gap junction genes. The SL-DT technique is a simple functional assay for the simultaneous assessment of GJIC in a large population of cells...
December 25, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28056049/asc-induces-apoptosis-via-activation-of-caspase-9-by-enhancing-gap-junction-mediated-intercellular-communication
#5
Masato Kitazawa, Shigeaki Hida, Chifumi Fujii, Shun'ichiro Taniguchi, Kensuke Ito, Tomio Matsumura, Nagisa Okada, Takashi Sakaizawa, Akira Kobayashi, Michiko Takeoka, Shin-Ichi Miyagawa
ASC (apoptosis-associated speck-like protein containing a CARD) is a key adaptor molecule of inflammasomes that mediates inflammatory and apoptotic signals. Aberrant methylation-induced silencing of ASC has been observed in a variety of cancer cells, thus implicating ASC in tumor suppression, although this role remains incompletely defined especially in the context of closely neighboring cell proliferation. As ASC has been confirmed to be silenced by abnormal methylation in HT1080 fibrosarcoma cells as well, this cell line was investigated to characterize the precise role and mechanism of ASC in tumor progression...
2017: PloS One
https://www.readbyqxmd.com/read/28049144/molecular-diffusion-through-cyanobacterial-septal-junctions
#6
Mercedes Nieves-Morión, Conrad W Mullineaux, Enrique Flores
: Heterocyst-forming cyanobacteria grow as filaments in which intercellular molecular exchange takes place. During the differentiation of N2-fixing heterocysts, regulators are transferred between cells. In the diazotrophic filament, vegetative cells that fix CO2 through oxygenic photosynthesis provide the heterocysts with reduced carbon and heterocysts provide the vegetative cells with fixed nitrogen. Intercellular molecular transfer has been traced with fluorescent markers, including calcein, 5-carboxyfluorescein, and the sucrose analogue esculin, which are observed to move down their concentration gradient...
January 3, 2017: MBio
https://www.readbyqxmd.com/read/28042145/hippocampal-expression-of-connexin36-and-connexin43-during-epileptogenesis-in-pilocarpine-model-of-epilepsy
#7
Sahel Motaghi, Mohammad Sayyah, Vahab Babapour, Reza Mahdian
BACKGROUND: Gap junctions (GJs) provide direct intercellular communications that are formed by hexameric protein subunits, called connexin (Cx). The role of Cxs in epileptogenesis has not received sufficient attention. Hippocampus with critical function in epileptogenesis has a wide network of GJs. We examined the protein expression levels of hippocampal Cx36 (the prominent Cx present between GABAergic interneurons) and Cx43 (the main Cx expressed by astrocytes) during epileptogenesis in the pilocarpine model of epilepsy...
January 2, 2017: Iranian Biomedical Journal
https://www.readbyqxmd.com/read/28035376/suicide-gene-therapy-of-rhabdomyosarcoma
#8
Paweł Konieczny, Maciej Sułkowski, Bogna Badyra, Jacek Kijowski, Marcin Majka
Rhabdomyosarcoma is the most common soft tissue sarcoma in childhood and young adulthood. Conventional treatment consisting of surgery, chemotherapy and radiotherapy can be insufficient, as long-term survival chances decrease dramatically when cancer recurrence occurs. Due to this fact, efficient treatment of this cancer is still a demanding issue, thus, novel and innovative therapies have to be considered as a part of combined treatment. In the present study, we present effective suicide gene therapy of rhabdomyosarcoma cell line Rh30 involving herpes simplex thymidine kinase (HSV-TK) and ganciclovir (GCV)...
February 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/27995745/towards-an-integrated-understanding-of-cardiac-arrhythmogenesis-growing-roles-of-experimental-pathology
#9
REVIEW
Hideo Tanaka, Taka-Aki Matsuyama, Tetsuro Takamatsu
Cardiac arrhythmias have long been regarded as derangement of electrical impulse initiation and conduction within the heart. However, underlying mechanisms for arrhythmogenesis are not fully understood solely from the electrophysiological viewpoint. This review article discusses pathogenesis of arrhythmias from non-electrical aspects, which were elucidated by spatiotemporal imaging of functional molecules in combination with morphological analysis of living heart tissues. Intracellular Ca(2+) ([Ca(2+) ]i ) overload, caused by myocardial injury, provokes Ca(2+) waves that could lead to abnormal excitations, i...
January 2017: Pathology International
https://www.readbyqxmd.com/read/27986931/bone-morphogenetic-protein-2-regulates-cell-cell-communication-by-down-regulating-connexin43-expression-in-luteinized-human-granulosa-cells
#10
Yan-Ting Wu, Hsun-Ming Chang, He-Feng Huang, Jian-Zhong Sheng, Peter C K Leung
STUDY QUESTION: Does bone morphogenetic protein 2 (BMP2) regulate connexin43 (Cx43) and modulate cell-cell communication in luteinized human granulosa cells? SUMMARY ANSWER: BMP2 decreases gap junction intercellular communication (GJIC) of luteinized human granulosa cells by down-regulating Cx43 expression through an activin receptor-like kinase (ALK)2/ALK3-mediated Sma- and Mad-related protein (SMAD)-dependent signaling pathway. WHAT IS KNOWN ALREADY: BMP2 and its putative receptors are highly expressed in the human corpus luteum and are involved in the process of luteolysis...
December 16, 2016: Molecular Human Reproduction
https://www.readbyqxmd.com/read/27929069/th1-cells-downregulate-connexin-43-gap-junctions-in-astrocytes-via-microglial-activation
#11
Mitsuru Watanabe, Katsuhisa Masaki, Ryo Yamasaki, Jun Kawanokuchi, Hideyuki Takeuchi, Takuya Matsushita, Akio Suzumura, Jun-Ichi Kira
We previously reported early and extensive loss of astrocytic connexin 43 (Cx43) in acute demyelinating lesions of multiple sclerosis (MS) patients. Because it is widely accepted that autoimmune T cells initiate MS lesions, we hypothesized that infiltrating T cells affect Cx43 expression in astrocytes, which contributes to MS lesion formation. Primary mixed glial cell cultures were prepared from newborn mouse brains, and microglia were isolated by anti-CD11b antibody-conjugated magnetic beads. Next, we prepared astrocyte-rich cultures and astrocyte/microglia-mixed cultures...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27923658/temporal-regulation-of-gap-junctional-communication-between-tenocytes-subjected-to-static-tensile-strain-with-physiological-and-non-physiological-amplitudes
#12
Eijiro Maeda, Haicheng Pian, Toshiro Ohashi
The present study has been performed on temporal changes in gap junctional intercellular communication (GJIC) between tenocytes under static tensile strain with the magnitude of 0% (no strain), 4% (physiological magnitude) or 8% (overloading magnitude) during a 24-h culture period. Tenocytes were isolated from rabbit Achilles tendon and seeded on a stretchable microgroove substrate. GJIC was evaluated as intercellular diffusion coefficient of calcein (DGJ) using fluorescence loss in photobleaching (FLIP) protocol accompanied with a mathematical model of molecular diffusion both within the cell and between the cells...
January 22, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27916369/expression-of-connexin-26-and-connexin-43-is-reduced-in-hirschsprung-s-disease
#13
David Coyle, Brian Doyle, Justin M Murphy, Anne Marie O'Donnell, John Gillick, Prem Puri
BACKGROUND: Despite having an optimal pull-through operation, some children with Hirschsprung's disease (HSCR) continue to experience persistent bowel symptoms. Coordinated colonic electrical activity depends on intercellular communication between the enteric nerves, interstitial cells of Cajal (ICCs), smooth muscle cells, and fibroblast-like (platelet-derived growth factor receptor-alpha-positive) cells. Gap junctions are low-resistance channels composed of connexin (Cx) proteins which couple cells electrically and chemically...
November 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27903977/dioscin-augments-hsv-tk-mediated-suicide-gene-therapy-for-melanoma-by-promoting-connexin-based-intercellular-communication
#14
Jianyong Xiao, Guangxian Zhang, Bin Li, Yingya Wu, Xijuan Liu, Yuhui Tan, Biaoyan Du
Suicide gene therapy is a promising strategy against melanoma. However, the low efficiency of the gene transfer technique can limit its application. Our preliminary data showed that dioscin, a glucoside saponin, could upregulate the expression of connexins Cx26 and Cx43, major components of gap junctions, in melanoma cells. We hypothesized that dioscin may increase the bystander effect of herpes simplex virus thymidine kinase/ganciclovir (HSV-tk/GCV) through increasing the formation of gap junctions. Further analysis showed that dioscin indeed could increase the gap junctional intercellular communication in B16 melanoma cells, resulting in more efficient GCV-induced bystander killing in B16tk cells...
November 26, 2016: Oncotarget
https://www.readbyqxmd.com/read/27876080/effect-of-testosterone-on-the-connexin37-of-sexual-mature-mouse-cumulus-oocyte-complex
#15
Yangyang Zhang, Yang Xu, Yanrong Kuai, Sheng Wang, Qing Xue, Jing Shang
BACKGROUND: Recent researches demonstrate that pre-treatment with androgen could increase retrieved oocytes number and clinical pregnancy rate in poor ovarian response (POR) patients. In view of gap junction intercellular communication (GJIC) is important for follicular growth, and androgen plays an important role in improving prognosis of POR patients, we speculate that androgen can increase the expression of connexin in follicle cells, and improve ovarian microenvironment, thus can promote ovarian response...
November 23, 2016: Journal of Ovarian Research
https://www.readbyqxmd.com/read/27874032/connexin-32-mediated-cell-cell-communication-is-essential-for-hepatic-differentiation-from-human-embryonic-stem-cells
#16
Jinhua Qin, Mingyang Chang, Shuyong Wang, Zhenbo Liu, Wei Zhu, Yi Wang, Fang Yan, Jian Li, Bowen Zhang, Guifang Dou, Jiang Liu, Xuetao Pei, Yunfang Wang
Gap junction-mediated cell-cell interactions are highly conserved and play essential roles in cell survival, proliferation, differentiation and patterning. We report that Connexin 32 (Cx32)-mediated gap junctional intercellular communication (GJIC) is necessary for human embryonic stem cell-derived hepatocytes (hESC-Heps) during step-wise hepatic lineage restriction and maturation. Vitamin K2, previously shown to promote Cx32 expression in mature hepatocytes, up-regulated Cx32 expression and GJIC activation during hepatic differentiation and maturation, resulting in significant increases of hepatic markers expression and hepatocyte functions...
November 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27870307/abrogation-of-gap-junctional-communication-in-es-cells-results-in-a-disruption-of-primitive-endoderm-formation-in-embryoid-bodies
#17
Philipp Wörsdörfer, Felicitas Bosen, Martina Gebhardt, Nicole Russ, Katrin Zimmermann, David Komla Kessie, Thileepan Sekaran, Angela Egert, Süleyman Ergün, Hubert Schorle, Alexander Pfeifer, Frank Edenhofer, Klaus Willecke
Gap junctional intercellular communication (GJIC) has been suggested to be involved in early embryonic development but the actual functional role remained elusive. Connexin (Cx) 43 and Cx45 are co-expressed in embryonic stem (ES) cells, form gap junctions and are considered to exhibit adhesive function and/or to contribute to the establishment of defined communication compartments. Here, we describe the generation of Cx43/Cx45-double deficient mouse ES cells to achieve almost complete breakdown of GJIC. Cre-loxP induced deletion of both, Cx43 and Cx45, results in a block of differentiation in embryoid bodies (EBs) without affecting pluripotency marker expression and proliferation in ES cells...
November 21, 2016: Stem Cells
https://www.readbyqxmd.com/read/27860834/regulation-of-mammalian-oocyte-meiosis-by-intercellular-communication-within-the-ovarian-follicle
#18
Laurinda A Jaffe, Jeremy R Egbert
Meiotic progression in mammalian preovulatory follicles is controlled by the granulosa cells around the oocyte. Cyclic GMP (cGMP) generated in the granulosa cells diffuses through gap junctions into the oocyte, maintaining meiotic prophase arrest. Luteinizing hormone then acts on receptors in outer granulosa cells to rapidly decrease cGMP. This occurs by two complementary pathways: cGMP production is decreased by dephosphorylation and inactivation of the NPR2 guanylyl cyclase, and cGMP hydrolysis is increased by activation of the PDE5 phosphodiesterase...
November 14, 2016: Annual Review of Physiology
https://www.readbyqxmd.com/read/27826898/collective-cell-migration-of-thyroid-carcinoma-cells-a-beneficial-ability-to-override-unfavourable-substrates
#19
Liudmila Lobastova, Dominik Kraus, Alexander Glassmann, Dilaware Khan, Christian Steinhäuser, Christina Wolff, Nadine Veit, Jochen Winter, Rainer Probstmeier
PURPOSE: Tumor cell invasion and metastasis are life threatening events. Invasive tumor cells tend to migrate as collective sheets. In the present in vitro study we aimed to (i) assess whether collective tumor cells gain benefits in their migratory potential compared to single cells and (ii) to identify its putative underlying molecular mechanisms. METHODS: The migratory potential of single and collective carcinoma cells was assessed using video time lapse microscopy and cell migration assays in the absence and presence of seven potential gap junction inhibitors or the Rac1 inhibitor Z62954982...
November 8, 2016: Cellular Oncology (Dordrecht)
https://www.readbyqxmd.com/read/27821536/stochastic-left-right-neuronal-asymmetry-in-caenorhabditis-elegans
#20
REVIEW
Amel Alqadah, Yi-Wen Hsieh, Rui Xiong, Chiou-Fen Chuang
Left-right asymmetry in the nervous system is observed across species. Defects in left-right cerebral asymmetry are linked to several neurological diseases, but the molecular mechanisms underlying brain asymmetry in vertebrates are still not very well understood. The Caenorhabditis elegans left and right amphid wing 'C' (AWC) olfactory neurons communicate through intercellular calcium signalling in a transient embryonic gap junction neural network to specify two asymmetric subtypes, AWC(OFF) (default) and AWC(ON) (induced), in a stochastic manner...
December 19, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
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