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https://www.readbyqxmd.com/read/28342807/myocardin-inhibited-the-gap-protein-connexin-43-via-promoted-mir-206-to-regulate-vascular-smooth-muscle-cell-phenotypic-switch
#1
Hui Li, Yuan Xiang, Li-Juan Fan, Xiao-Yu Zhang, Jia-Peng Li, Cheng-Xi Yu, Le-Yuan Bao, Dong-Sun Cao, Wei-Bing Xing, Xing-Hua Liao, Tong-Cun Zhang
Myocardin is regarded as a key mediator for the change of smooth muscle phenotype. The gap junction protein connexin 43 (Cx43) has been shown to be involved in vascular smooth muscle cells (VSMCs) proliferation and the development of atherosclerosis. However, the role of myocardin on gap junction of cell communication and the relation between myocardin and Cx43 in VSMC phenotypic switch has not been investigated. The goal of the present study is to investigate the molecular mechanism by which myocardin affects Cx43-regulated VSMC proliferation...
March 22, 2017: Gene
https://www.readbyqxmd.com/read/28338575/the-role-of-cx43-mediated-nf%C3%B0%C2%BAb-signaling-pathway-in-ossification-of-posterior-longitudinal-ligament-an-in-vivo-and-in-vitro-study
#2
Dechun Chen, Yu Chen, Tiefeng Li, Lei Shi, Mengxiao Pan, Deyu Chen
STUDY DESIGN: In vivo and in vitro experiments. OBJECTIVES: To illustrate the further molecular mechanism of Cx43-mediated osteoblastic differentiation of ligament cells. SUMMARY OF BACKGROUND DATA: Ossification of the posterior longitudinal ligament (OPLL) is one of the main causes of myelopathy in Asian, but its etiology has not been clarified. We have previously found the mechanical stress can up-regulate Cx43 expression in ligament cells, which transduces mechanical signal to promote osteoblastic differentiation...
March 23, 2017: Spine
https://www.readbyqxmd.com/read/28337705/the-effects-of-polyunsaturated-fatty-acids-and-antioxidant-vitamins-on-atrial-oxidative-stress-nitrotyrosine-residues-and-connexins-following-extracorporeal-circulation-in-patients-undergoing-cardiac-surgery
#3
Felipe Petersen, Ramón Rodrigo, Manfred Richter, Sawa Kostin
Cardiac surgery with extracorporeal circulation is characterized by different degrees of myocardial ischemia/reperfusion, which is often associated with postoperative atrial fibrillation (POAF). We have previously shown that a novel preventive therapy based on the reinforcement of the antioxidant system using omega-3 fatty acids plus antioxidant vitamin supplementation applied to patients undergoing cardiac surgery reduces POAF occurrence. We hypothesized that oxidative stress and nitrosative stress are involved in the development of an arrhythmogenic substrate by their effect on connexins (Cx40, Cx43 and Cx45) abundance and distribution pattern...
March 23, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28337462/time-and-dose-dependent-effects-of-17-beta-estradiol-on-short-term-real-time-proliferation-and-gene-expression-in-porcine-granulosa-cells
#4
Sylwia Ciesiółka, Joanna Budna, Karol Jopek, Artur Bryja, Wiesława Kranc, Sylwia Borys, Michal Jeseta, Adrian Chachuła, Agnieszka Ziółkowska, Paweł Antosik, Dorota Bukowska, Klaus P Brüssow, Małgorzata Bruska, Michał Nowicki, Maciej Zabel, Bartosz Kempisty
The key mechanisms responsible for achievement of full reproductive and developmental capability in mammals are the differentiation and transformation of granulosa cells (GCs) during folliculogenesis, oogenesis, and oocyte maturation. Although the role of 17 beta-estradiol (E2) in ovarian activity is widely known, its effect on proliferative capacity, gap junction connection (GJC) formation, and GCs-luteal cells transformation requires further research. Therefore, the goal of this study was to assess the real-time proliferative activity of porcine GCs in vitro in relation to connexin (Cx), luteinizing hormone receptor (LHR), follicle stimulating hormone receptor (FSHR), and aromatase (CYP19A1) expression during short-term (168 h) primary culture...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28333312/establishment-maintenance-and-functional-integrity-of-the-blood-testis-barrier-in-organotypic-cultures-of-fresh-and-frozen-thawed-prepubertal-mouse-testes
#5
C Rondanino, A Maouche, L Dumont, A Oblette, N Rives
STUDY QUESTION: Can the spatio-temporal formation of an intact blood-testis barrier (BTB), which is essential for the progression of spermatogenesis, be reproduced in cultures of fresh or frozen/thawed prepubertal mouse testes? SUMMARY ANSWER: Organotypic cultures allow the establishment and maintenance of major BTB components and the formation of a functional BTB in mouse testicular tissues. WHAT IS KNOWN ALREADY: In vitro maturation of prepubertal testicular tissues is a promising approach to restore fertility in adult survivors of childhood cancer...
March 17, 2017: Molecular Human Reproduction
https://www.readbyqxmd.com/read/28329830/secondhand-smoke-prevalent-polycyclic-aromatic-hydrocarbon-binary-mixture-induced-specific-mitogenic-and-pro-inflammatory-cell-signaling-events-in-lung-epithelial-cells
#6
Ross S Osgood, Brad L Upham, Pierre R Bushel, Kalpana Velmurugan, Ka-Na Xiong, Alison K Bauer
Low molecular weight polycyclic aromatic hydrocarbons (LMW PAHs; < 206.3 g/mol) are prevalent and ubiquitous environmental contaminants, presenting a human health concern, and have not been as thoroughly studied as the high MW PAHs. LMW PAHs exert their pulmonary effects, in part, through P38-dependent and -independent mechanisms involving cell-cell communication and the production of pro-inflammatory mediators known to contribute to lung disease. Specifically, we determined the effects of two representative LMW PAHs, 1-methylanthracene (1-MeA) and fluoranthene (Flthn), individually and as a binary PAH mixture on the dysregulation of gap junctional intercellular communication (GJIC) and connexin 43 (Cx43), activation of mitogen activated protein kinases (MAPK), and induction of inflammatory mediators in a mouse non-tumorigenic alveolar type II cell line (C10)...
January 30, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28317237/disruption-of-the-cx43-mir21-pathway-leads-to-osteocyte-apoptosis-and-increased-osteoclastogenesis-with-aging
#7
Hannah M Davis, Rafael Pacheco-Costa, Emily G Atkinson, Lucas R Brun, Arancha R Gortazar, Julia Harris, Masahiro Hiasa, Surajudeen A Bolarinwa, Toshiyuki Yoneda, Mircea Ivan, Angela Bruzzaniti, Teresita Bellido, Lilian I Plotkin
Skeletal aging results in apoptosis of osteocytes, cells embedded in bone that control the generation/function of bone forming and resorbing cells. Aging also decreases connexin43 (Cx43) expression in bone; and osteocytic Cx43 deletion partially mimics the skeletal phenotype of old mice. Particularly, aging and Cx43 deletion increase osteocyte apoptosis, and osteoclast number and bone resorption on endocortical bone surfaces. We examined herein the molecular signaling events responsible for osteocyte apoptosis and osteoclast recruitment triggered by aging and Cx43 deficiency...
March 19, 2017: Aging Cell
https://www.readbyqxmd.com/read/28296544/the-conduction-system-and-expressions-of-hyperpolarization-activated-cyclic-nucleotide-gated-cation-channel-4-and-connexin43-expressions-in-the-hearts-of-fetal-day-13-mice
#8
Y Wen, B Li
We investigated the development of the sinus node of the heart conduction system by localizing hyperpolarization-activated cyclic nucleotide-gated cation channel 4 (HCN4) and connexin43 (Cx43) in the hearts of fetal day 13 mice. Horizontal serial sections of day 13 whole fetuses were stained by hematoxylin and eosin and immunofluorescence to identify myocardial cells that express HCN4, hyperpolarization-activated cyclic nucleotide-gated cation channel 2 (HCN2) and Cx43. Expression levels of HCN4 and Cx43 were determined by quantitative RT-PCR in both fetal day 13 and adult mice...
2017: Biotechnic & Histochemistry: Official Publication of the Biological Stain Commission
https://www.readbyqxmd.com/read/28295574/cd38-positively-regulates-postnatal-development-of-astrocytes-cell-autonomously-and-oligodendrocytes-non-cell-autonomously
#9
Tsuyoshi Hattori, Minoru Kaji, Hiroshi Ishii, Roboon Jureepon, Mika Takarada-Iemata, Hieu Minh Ta, Thuong Manh Le, Ayumu Konno, Hirokazu Hirai, Yoshitake Shiraishi, Noriyuki Ozaki, Yasuhiko Yamamoto, Hiroshi Okamoto, Shigeru Yokoyama, Haruhiro Higashida, Yasuko Kitao, Osamu Hori
Glial development is critical for the function of the central nervous system. CD38 is a multifunctional molecule with ADP-ribosyl cyclase activity. While critical roles of CD38 in the adult brain such as oxytocin release and social behavior have been reported, those in the developing brain remain largely unknown. Here we demonstrate that deletion of Cd38 leads to impaired development of astrocytes and oligodendrocytes in mice. CD38 is highly expressed in the developing brains between postnatal day 14 (P14) and day 28 (P28)...
March 13, 2017: Glia
https://www.readbyqxmd.com/read/28288337/remodelling-of-myocardial-intercalated-disc-protein-connexin-43-causes-increased-susceptibility-to-malignant-arrhythmias-in-arvc-d-patients
#10
Xiao Chen, Liang Chen, Zhenglian Chen, Xinshan Chen, Jiangping Song
BACKGROUND: Arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) is a primary cardiomyopathy characterised by fibrofatty replacement and ventricular arrhythmias. The occurrence of malignant arrhythmias may be associated with fatty infiltration and intercalated disk remodelling, but the specific pathological remodelling pattern is not yet clear. METHODS: Twelve explanted hearts from patients diagnosed with ARVC/D according to the 2010 Task Force Criteria and pathology examination were divided into two groups with (SVT, n=6) or without (non-SVT, n=6) recurrent sustained ventricular tachycardia (SVT) before heart transplantation...
February 27, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28283549/mild-hypothermia-preserves-myocardial-conduction-during-ischemia-by-maintaining-gap-junction-intracellular-communication-and-sodium-channel-function
#11
Michelle Mj Nassal, Xiaoping Wan, Zack Dale, Isabelle Deschenes, Lance D Wilson, Joseph Stephen Piktel
BACKGROUND: Acute cardiac ischemia induces conduction velocity (CV) slowing and conduction block, promoting reentrant arrhythmias leading to sudden cardiac arrest (SCA). Previously, we found that mild hypothermia (MH, 32°C) attenuates ischemia-induced conduction block and CV slowing in a canine model of early global ischemia. Acute ischemia impairs cellular excitability and the GJ protein connexin 43 (Cx43). We hypothesized that MH prevented ischemia-induced conduction block and CV slowing by preserving GJ expression and localization...
March 10, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28280004/connexin-purinergic-signaling-in-enteric-glia-mediates-the-prolonged-effect-of-morphine-on-constipation
#12
Sukhada Bhave, Aravind Gade, Minho Kang, Kurt F Hauser, William L Dewey, Hamid I Akbarali
Morphine is one of the most widely used drugs for the treatment of pain. However, side effects, including persistent constipation and antinociceptive tolerance limit its clinical efficacy. Prolonged morphine treatment results in a "leaky" gut predisposing to colonic inflammation that is facilitated by microbial dysbiosis and associated bacterial translocation. In this study, we examined the role of enteric glia in mediating this secondary inflammatory response to prolonged treatment with morphine. We found that purinergic P2X receptor activity was significantly enhanced in enteric glia that were isolated from mice with long-term morphine treatment (in vivo) but not upon direct exposure of glia to morphine (in vitro)...
March 9, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
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
#13
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
#14
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...
February 9, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28250650/chronic-intake-of-green-propolis-negatively-affecting-the-rat-testis
#15
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/28245135/connexin43-controls-the-myofibroblastic-differentiation-of-bronchial-fibroblasts-from-asthmatic-patients
#16
Milena Paw, Izabela Borek, Dawid Wnuk, Damian Ryszawy, Katarzyna Piwowarczyk, Katarzyna Kmiotek, Katarzyna A Wójcik-Pszczoła, Małgorzata Pierzchalska, Zbigniew Madeja, Marek Sanak, Przemysław Błyszczuk, Marta Michalik, Jarosław Czyż
Pathologic accumulation of myofibroblasts in asthmatic bronchi is regulated by extrinsic stimuli and by the intrinsic susceptibility of bronchial fibroblasts to transforming growth factor-β (TGF-β). The specific function of gap junctions and connexins in this process remained unknown. Here, we investigated the role of connexin (Cx)43 in TGF-β-induced myofibroblastic differentiation of fibroblasts derived from bronchoscopic biopsies of asthmatic patients and non-asthmatic donors. Asthmatic fibroblasts expressed considerably higher levels of Cx43 and were more susceptible to TGF-β1-induced myofibroblastic differentiation than their non-asthmatic counterparts...
February 28, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/28205646/connexin30-3-is-expressed-in-mouse-embryonic-stem-cells-and-is-responsive-to-leukemia-inhibitory-factor
#17
Mikako Saito, Yuma Asai, Keiichi Imai, Shoya Hiratoko, Kento Tanaka
The expression of 19 connexin (Cx) isoforms was observed in the mouse embryonic stem (ES) cell line, EB3. Their expression patterns could be classified into either pluripotent state-specific, differentiating stage-specific, or non-specific Cxs. We focused on Cx30.3 as typical of the first category. Cx30.3 was pluripotent state-specific and upregulated by leukemia inhibitory factor (LIF), a specific cytokine that maintains the pluripotent state of ES cell, via a Jak signaling pathway. Cx30.3 protein was localized to both the cell membrane and cytosol...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205211/unraveling-a-novel-mechanism-for-the-up-regulation-of-connexin43-gap-junctions-between-cells-derived-from-the-blood-brain-barrier
#18
Juan C Sáez
Endothelial cells from different vascular territories in mammals express at least three connexins (Cxs: Cx37, Cx40 and Cx43), which are protein subunits of gap junction channels. This article is protected by copyright. All rights reserved.
February 15, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28194469/phenylephrine-induced-cardiac-hypertrophy-is-attenuated-by-a-histone-acetylase-inhibitor-anacardic-acid-in-mice
#19
Chang Peng, Xiaomei Luo, Shuo Li, Huichao Sun
Cardiac hypertrophy is a complex process involving highly coordinated but tight regulation of multiple elements, such as in epigenetics, which make an important contribution to myocardium remodeling and cardiac hypertrophy. Epigenetic regulations, particularly histone acetylation, have been implicated in cardiac hypertrophy, however, the exact mechanism is still largely unknown. In the present study, we explored the potential attenuating effects of Chinese herbal extract anacardic acid on phenylephrine-induced cardiac hypertrophy and the underlying mechanism...
February 14, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28192031/neural-crest-stem-cells-can-differentiate-to-a-cardiomyogenic-lineage-with-an-ability-to-contract-in-response-to-pulsed-infrared-stimulation
#20
Jordan M Greenberg, Vicente Lumbreras, Daniel Pelaez, Suhrud M Rajguru, Herman S Cheung
INTRODUCTION: Cellular cardiomyoplasty has rapidly risen to prominence in the clinic following a myocardial infarction; however, low engraftment of transplanted cells limits the therapeutic benefit to these procedures. Recently, lineage-specific stem cells differentiated into cardiomyocytes have gained much attention to assist in the repair of an injured heart tissue; however, questions regarding the ideal cell source remain. In the present study, we have identified a source that is easy to extract stem cells from and show that the cells present have a high plasticity toward the cardiomyogenic lineage...
October 2016: Tissue Engineering. Part C, Methods
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