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https://www.readbyqxmd.com/read/28674041/transient-notch-activation-induces-long-term-gene-expression-changes-leading-to-sick-sinus-syndrome-in-mice
#1
Yun Qiao, Catherine Lipovsky, Stephanie Hicks, Somya Bhatnagar, Gang Li, Aditi Khandekar, Robert Guzy, Kel Vin Woo, Colin G Nichols, Igor R Efimov, Stacey Rentschler
Rationale: Notch signaling programs cardiac conduction during development, and in the adult ventricle, injury-induced Notch reactivation initiates global transcriptional and epigenetic changes. Objective: To determine whether Notch reactivation may stably alter atrial ion channel gene expression and arrhythmia inducibility. Methods and Results: To model an injury response and determine the effects of Notch signaling on atrial electrophysiology, we transiently activate Notch signaling within adult myocardium using a doxycycline-inducible genetic system (iNICD)...
July 3, 2017: Circulation Research
https://www.readbyqxmd.com/read/28661424/vitamin-c-and-microvascular-dysfunction-in-systemic-inflammation
#2
REVIEW
Karel Tyml
Sepsis, life-threatening organ dysfunction caused by a dysfunctional host response to infection, is associated with high mortality. A promising strategy to improve the outcome is to inject patients intravenously with ascorbate (vitamin C). In animal models of sepsis, this injection improves survival and, among others, the microvascular function. This review examines our recent work addressing ascorbate's ability to inhibit arteriolar dysfunction and capillary plugging in sepsis. Arteriolar dysfunction includes impaired vasoconstriction/dilation (previously reviewed) and impaired conduction of vasoconstriction/dilation along the arteriole...
June 29, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28640508/intraglomerular-gap-junctions-enhance-interglomerular-synchrony-in-a-sparsely-connected-olfactory-bulb-network
#3
Frederic Pouille, Thomas S McTavish, Lawrence E Hunter, Diego Restrepo, Nathan E Schoppa
A dominant feature of the olfactory bulb response to odour is fast synchronized oscillations at beta (15-40 Hz) or gamma (40-90 Hz) frequencies, thought to be involved in integration of olfactory signals. Mechanistically, the bulb presents an interesting case study for understanding how beta/gamma oscillations arise. Fast oscillatory synchrony in the activity of output mitral cells (MCs) appears to result from interactions with GABAergic granule cells (GCs), yet the incidence of MC-GC connections is very low, around 4%...
June 22, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28622830/corrigendum-to-involvement-of-autophagy-in-connexin-40-reduction-in-the-late-phase-of-traumatic-brain-injury-in-rats-brain-res-bull-131-2017-100-106
#4
Wei Chen, Yijun Guo, Wenjin Yang, Ping Zheng, Jinsong Zeng, Wusong Tong
No abstract text is available yet for this article.
June 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28545280/-impacts-of-early-metoprolol-intervention-on-connexin-43-and-phosphorylated-connexin-43-expression-in-rabbits-with-experimental-myocardial-infarction
#5
M Zhou, Q Lu, J Q Jiang, Z N Chen, Z G Gong, Z G Li, W W Fu, S F Ding
Objective: To investigate the early intervention effects of metoprolol on connexin 43(Cx43) and phosphorylated Cx43 (p-Cx43) expression in rabbits with post myocardial infarction. Methods: A total of 24 adult male New Zealand white rabbits were divided into sham group (n=6), early treatment group(n=6), routine treatment group(n=6), and myocardial infarction group(n=6) with a randomized block design blocked by weight. Myocardial infarction was induced by left anterior descending coronary artery (LAD) ligation...
April 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/28498436/exposure-to-a-chronic-high-fat-diet-promotes-atrial-structure-and-gap-junction-remodeling-in-rats
#6
Tianyu Meng, Gong Cheng, Yuejiao Wei, Shuting Ma, Yongrong Jiang, Jine Wu, Xin Zhou, Chaofeng Sun
Obesity has been demonstrated to be linked to atrial fibrillation (AF) with atrial enlargement and tissue fibrosis. Long-term high calorie intake is the main reason for the prevalence of obesity. To investigate the possible causes of AF, such as chronic high-fat diet (HFD), and to identify the underlying mechanisms, the present study analyzed a variety of structural and gap junctional electrophysiological alterations in the atria of female rats fed an HFD. After consistent HFD feeding of female rats for 12 weeks, hematoxylin and eosin (H&E) and Masson's staining, RT-qPCR, western blotting, immunofluorescence and TUNEL staining were performed...
May 9, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28429502/involvement-of-erk1-2-in-cx43-depression-induced-by-macrophage-migration-inhibitory-factor-in-atrial-myocytes
#7
Xin Li, Fang Rao, Chun-Yu Deng, Wei Wei, Fang-Zhou Liu, Hui Yang, Zhao-Yu Wang, Su-Juan Kuang, Xiao-Yan Chen, Yu-Mei Xue, Shu-Lin Wu
Connexin 43 (Cx43) plays an important role in the pathogenesis of atrial fibrillation (AF). The present study sought to investigate the effect of macrophage migration inhibitory factor (MIF), a pleiotropic cytokine, on Cx43 expression and activity and determine the intracellular signaling pathways. Cx43 protein and mRNA levels were assayed using immunofluorescence, real-time PCR, and western blot. We found that increased MIF and extracellular regulated protein kinases (ERK) expression was accompanied by a significant reduction in Cx43 protein expression in atrial tissues from patients with AF compared with those with sinus rhythm...
April 21, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28373150/involvement-of-autophagy-in-connexin-40-reduction-in-the-late-phase-of-traumatic-brain-injury-in-rats
#8
Wei Che, Yijun Guo, Wenjin Yang, Ping Zheng, Jinsong Zeng, Wusong Tong
Brain trauma can activate an attenuation of connexin gap junction that is implicated in neuronal injury, but the underlying cellular mechanisms remain incompletely understood. Here, we aimed to study whether autophagy, a stress-response process for recycling of intracellular proteins and organelles, is involved in the reduction of connexin 40 (Cx40) during the late phase of traumatic brain injury (TBI). In a rat model of TBI induced by controlled cortical impact (CCI), we found that Cx40 protein in the brain started to decline at post-surgery day 2 and the decrease continued for up to day 6...
April 1, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28350969/mechanisms-of-spontaneous-pacing-sinoatrial-nodal-cells-neonatal-cardiomyocytes-and-human-stem-cell-derived-cardiomyocytes
#9
Martin Morad, Xiao-Hua Zhang
The sinoatrial (SA) node is the primary site from which the mammalian heart is paced, but the mechanisms underlying the pacemaking still remain clouded. It is generally believed that the hyperpolarization-activated current If, encoded by hyperpolarization-activated cyclic nucleotide-gated (HCN) genes, contributes significantly to pacing, which in tandem with inward current generated by efflux of Ca(2+) via the Na(+)-Ca(2+) exchanger (NCX), resulting from the released Ca(2+), mediates the diastolic depolarization...
March 28, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28260321/-hydroxyfasudi-attenuates-lipopolysaccharide-induced-endothelial-dysfunction-via-suppressing-the-expression-of-rho-associated-coiled-coil-protein-kinase-1-connexin-43-and-caveolin-1
#10
P F Zheng, X H Wu, W Huang, G T Ma, Q Bi
Objective: To investigate the effect and mechanism of hydroxyfasudi (HF), a specific Rho kinase inhibitor, on lipopolysaccharide(LPS)induced endothelial dysfunction. Methods: A total of 24 male Sprague Dawley rats were randomly divided into control group(n=6), HF group(n=6), LPS group(n=6) and LPS + HF group(n=6) with random number table method. There was no special treatment in control group. HF (30 mg/kg) was injected intraperitoneally in HF group. LPS (1 mg/kg) were injected intravenously in LPS group. In LPS+ HF group, HF (30 mg/kg) was injected intraperitoneally, followed by intravenous LPS injection (1 mg/kg) 30 minutes later...
February 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/28259990/role-of-gap-junctions-in-the-contractile-response-to-agonists-in-the-mesenteric-resistance-artery-of-rats-with-acute-hypoxia
#11
Huan Liu, Xin-Zhi Li, Min Peng, Wei Ji, Lei Zhao, Li Li, Liang Zhang, Jun-Qiang Si, Ke-Tao Ma
Hypoxic exposure results in the vascular dysfunction and reduction of vasomotor responses and thus disrupts or reduces blood flow in the resistance arteries. Connexin (Cx)-mediated gap junctional intercellular communication (GJIC) serves a critical role in the regulation of vasomotor tone and the synchronized contraction of arteries, however whether the adverse effect of hypoxia on vasomotor responses in vascular smooth muscle layer of resistance arteries is involved in changes in the GJIC and the expression of Cx43 and Cx45 remains to be elucidated...
April 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28250650/chronic-intake-of-green-propolis-negatively-affecting-the-rat-testis
#12
Grasiela Dias de Campos Severi-Aguiar, Suellen Josine Pinto, Cristina Capucho, Camila Andrea Oliveira, Maria Aparecida Diamante, Renata Barbieri, Fabrícia Souza Predes, Heidi Dolder
BACKGROUND: Human and animal evidence suggests that environmental toxicants may have an adverse impact on male reproductive health, reducing the population's reproductive output. Owing to the renewed attraction for natural products, some of them constitute effective alternatives to mitigate these effects. Propolis is a candidate for this use because of its intrinsic properties. In many situations, it improved the testicular damage and alleviated the toxic effects induced by environmental contaminant exposure...
January 2017: Pharmacognosy Research
https://www.readbyqxmd.com/read/28177659/effects-of-ferulic-acid-on-oxidative-stress-heat-shock-protein-70-connexin-43-and-monoamines-in-the-hippocampus-of-pentylenetetrazole-kindled-rats
#13
Abdelaziz M Hussein, Khaled M Abbas, Osama A Abulseoud, El-Hussainy M A El-Hussainy
The present study investigated the effects of ferulic acid (FA) on pentylenetetrazole (PTZ)-induced seizures, oxidative stress markers (malondialdehyde (MDA), catalase, and reduced glutathione (GSH)), connexin (Cx) 43, heat shock protein 70 (Hsp 70), and monoamines (serotonin (5-HT) and norepinephrine (NE)) levels in a rat model of PTZ-induced kindling. Sixty Sprague Dawley rats were divided into 5 equal groups: (a) normal group; (b) FA group: normal rats received FA at a dose of 40 mg/kg daily; (c) PTZ group: normal rats received PTZ at a dose of 50 mg/kg i...
February 3, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28170287/intermediate-reprogramming-of-mouse-skin-fibroblasts-into-stem-like-cells-by-bone-morphogenetic-protein-4
#14
Seung-Eun Lee, Sang-Jun Uhm, Yeo-Jin Son, Yun-Gwi Park, Eun-Young Kim, Se-Pill Park
Specific transcription factors are sufficient to reprogram fully induced pluripotent stem cells or other types of cells. These findings raise the question of whether chemical molecules or proteins can replace transcription factors to alter the defined cell fate. In this study, we treated mouse skin fibroblasts (MSFs) with bone morphogenetic protein 4 (BMP4) and examined intermediate reprogramming of MSFs into stem-like cells. Putative epidermal stem cells isolated from the ventral skin epidermis of an adult mouse were used to confirm the reprogramming activity of BMP4, which increased the proliferation of these cells...
April 2017: Cellular Reprogramming
https://www.readbyqxmd.com/read/28034749/functional-consequences-of-co-expressing-connexin40-or-connexin45-with-connexin43-on-intercellular-electrical-coupling
#15
Neil M Thomas, Rosaire Gray, Christopher H Fry, Thomas Desplantez, Nicholas S Peters, Nicholas J Severs, Kenneth T Macleod, Emmanuel Dupont
The functional characteristics of the co-expression of connexin43, connexin40, and connexin45 proteins in human myocardium are thought to play an important role in governing normal propagation of the cardiac electrical impulse and in generating the myocardial substrate for some arrhythmias and conduction disturbances. A rat liver epithelial cell line, that endogenously expresses connexin43, was used to induce also expression of connexin40 or connexin45 after stable transfection using an inducible ecdysone system...
January 29, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28033238/congenital-cytomegalovirus-infection-and-permanent-hearing-loss-in-rural-north-indian-children
#16
Lalit Dar, Divya Namdeo, Pankaj Kumar, Alok Thakar, Shashi Kant, Sanjay Rai, Pawan K Singh, Madhulika Kabra, Karen B Fowler, Suresh B Boppana
BACKGROUND: Congenital cytomegalovirus infection (cCMV) is a leading nongenetic cause of permanent congenital or early-onset hearing loss (PCEHL). Although cCMV rates are high despite near-universal seroimmunity, the contribution of cCMV to PCEHL in the developing world is unclear. METHODS: Neonates at a rural North Indian hospital were screened for cCMV by saliva polymerase chain reaction and hearing by distortion-product otoacoustic emission testing. Cytomegalovirus (CMV)-positive infants and those not passing newborn hearing screening (NHS) were evaluated by auditory brainstem response to confirm PCEHL...
July 2017: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/27871290/heterozygous-connexin-50-mutation-affects-metabolic-syndrome-attributes-in-spontaneously-hypertensive-rat
#17
Ondřej Šeda, Drahomíra Křenová, Olena Oliyarnyk, Lucie Šedová, Michaela Krupková, František Liška, Blanka Chylíková, Ludmila Kazdová, Vladimír Křen
BACKGROUND: Several members of connexin family of transmembrane proteins were previously implicated in distinct metabolic conditions. In this study we aimed to determine the effects of complete and heterozygous form of connexin50 gene (Gja8) mutation L7Q on metabolic profile and oxidative stress parameters in spontaneously hypertensive inbred rat strain (SHR). METHODS: Adult, standard chow-fed male rats of SHR, heterozygous SHR-Dca+/- and SHR-Dca-/- coisogenic strains were used...
November 21, 2016: Lipids in Health and Disease
https://www.readbyqxmd.com/read/27843504/relationship-between-patients-with-clinical-auditory-neuropathy-spectrum-disorder-and-mutations-in-gjb2-gene
#18
Guilherme M de Carvalho, Priscila Z Ramos, Arthur M Castilho, Alexandre C Guimarães, Edi L Sartorato
The auditory neuropathy is a condition which there is a dyssynchrony in the nerve conduction of the auditory nerve fibers. There is no evidence about the relationship between patients with clinical auditory neuropathy spectrum disorder and mutations in GJB2 gene. There are only two studies about this topic in the medical literature. Connexin 26 (GJB2 gene) mutations are common causes of genetic deafness in many populations and we also being reported in subjects with auditory neuropathy. OBJECTIVE: To analyze the pattern of clinical relationship between patients with clinical diagnosis with auditory neuropathy spectrum disorder and GJB2 gene...
2016: Open Neurology Journal
https://www.readbyqxmd.com/read/27826129/genotypic-and-phenotypic-predictors-of-complete-heart-block-and-recovery-of-conduction-after-surgical-repair-of-congenital-heart-disease
#19
Laura E Murray, Andrew H Smith, English C Flack, Kim Crum, Jill Owen, Prince J Kannankeril
BACKGROUND: Complete heart block (CHB) is a major complication that occurs after congenital heart surgery. We hypothesized that genetic and clinical factors are associated with the development of postoperative CHB and recovery of atrioventricular (AV) conduction. OBJECTIVE: The purpose of this study was to identify predictors of CHB and recovery after congenital heart surgery. METHODS: Patients undergoing congenital heart surgery at our institution from September 2007 through June 2015 were prospectively enrolled in a parent study of postoperative arrhythmias...
March 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/27813566/association-between-44g-a-and-71a-g-polymorphisms-in-the-connexin-40-gene-and-atrial-fibrillation-in-uyghur-and-han-populations-in-xinjiang-china
#20
J Hailati, Y C Yang, L Zhang, P Y He, M Baikeyi, W Muhuyati, Z Q Liu
We aimed to elucidate the association between connexin 40 (Cx40) genetic polymorphisms and atrial fibrillation (AF) in a Chinese population in Xinjiang comprising Uyghur and Han individuals. We enrolled 275 Uyghur and 305 age- and gender-matched Han subjects, and used polymerase chain reaction to detect single nucleotide polymorphisms (SNPs; -44G/A and +71A/G) in the gene encoding Cx40. A mutation screening was performed by direct sequencing and calculation of genotype and allele frequencies among AF patients and control subjects to determine the relationship between these variants and this condition in Uyghur and Han populations...
October 17, 2016: Genetics and Molecular Research: GMR
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