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https://www.readbyqxmd.com/read/28524267/synaptic-activity-suppresses-expression-of-neurogenic-differentiation-factor-2-in-an-nmda-receptor-dependent-manner
#1
Fading Chen, Benjamin J Hall
Neurogenic differentiation factor 2 (NeuroD2) is a highly expressed transcription factor in the developing central nervous system. In newborn neurons, NeuroD2-mediated gene expression promotes differentiation, maturation, and survival. In addition to these early, cell-intrinsic developmental processes, NeuroD2 in post-mitotic neurons also regulates synapse growth and ion channel expression to control excitability. While NeuroD2 transactivation can be induced in an activity-dependent manner, little is known about how expression of NeuroD2 itself is regulated...
May 19, 2017: Synapse
https://www.readbyqxmd.com/read/28521133/camkii-autophosphorylation-is-necessary-for-optimal-integration-of-ca-2-signals-during-ltp-induction-but-not-maintenance
#2
Jui-Yun Chang, Paula Parra-Bueno, Tal Laviv, Erzsebet M Szatmari, Seok-Jin R Lee, Ryohei Yasuda
CaMKII plays a critical role in decoding calcium (Ca(2+)) signals to initiate long-lasting synaptic plasticity. However, the properties of CaMKII that mediate Ca(2+) signals in spines remain elusive. Here, we measured CaMKII activity in spines using fast-framing two-photon fluorescence lifetime imaging. Following each pulse during repetitive Ca(2+) elevations, CaMKII activity increased in a stepwise manner. Thr286 phosphorylation slows the decay of CaMKII and thus lowers the frequency required to induce spine plasticity by several fold...
May 17, 2017: Neuron
https://www.readbyqxmd.com/read/28516430/ramelteon-improves-post-traumatic-stress-disorder-like-behaviors-exhibited-by-fatty-acid-binding-protein-3-null-mice
#3
Yasushi Yabuki, Ibuki Takahata, Kazuya Matsuo, Yuji Owada, Kohji Fukunaga
We previously reported that fatty acid-binding protein 3 (FABP3) knockout (Fabp3 (-/-)) mice exhibit abnormal dopamine-related behaviors such as enhanced dopamine D2 receptor antagonist-induced catalepsy behaviors. Here, we report that Fabp3 null mice exhibit cognitive deficits, hyperlocomotion and impaired fear extinction, and thus show post-traumatic stress disorder (PTSD)-like behaviors. Notably, chronic administration of ramelteon (1.0 mg/kg, p.o.), a melatonin receptor agonist, improved all PTSD-like behaviors tested in Fabp3 (-/-) mice...
May 17, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28487342/calcium-calmodulin-dependent-protein-kinase-ii-activity-persists-during-chronic-%C3%AE-adrenoceptor-blockade-in-experimental-and-human-heart-failure
#4
Matthias Dewenter, Stefan Neef, Christiane Vettel, Simon Lämmle, Christina Beushausen, Laura C Zelarayan, Sylvia Katz, Albert von der Lieth, Stefanie Meyer-Roxlau, Silvio Weber, Thomas Wieland, Samuel Sossalla, Johannes Backs, Joan H Brown, Lars S Maier, Ali El-Armouche
BACKGROUND: Considerable evidence suggests that calcium/calmodulin-dependent protein kinase II (CaMKII) overactivity plays a crucial role in the pathophysiology of heart failure (HF), a condition characterized by excessive β-adrenoceptor (β-AR) stimulation. Recent studies indicate a significant cross talk between β-AR signaling and CaMKII activation presenting CaMKII as a possible downstream mediator of detrimental β-AR signaling in HF. In this study, we investigated the effect of chronic β-AR blocker treatment on CaMKII activity in human and experimental HF...
May 2017: Circulation. Heart Failure
https://www.readbyqxmd.com/read/28484221/a-novel-non-genomic-glucocorticoid-signaling-mediated-by-a-membrane-palmitoylated-glucocorticoid-receptor-cross-talks-with-gnrh-in-gonadotrope-cells
#5
Mohsen Ayrout, Violaine Simon, Valérie Bernard, Nadine Binart, Joëlle Cohen-Tannoudji, Marc Lombès, Stéphanie Chauvin
Glucocorticoid hormones (GC) are the main stress mediators associated with reproductive disorders. GC exert their effects through activation of the glucocorticoid receptor (GR) principally acting as a transcription factor. Beside well-established GR-mediated genomic actions, several lines of evidence suggest a role for rapid membrane-initiated GC signaling in gonadotrope cells triggered by a membrane-associated GR. Herein, we demonstrate the existence of a specific membrane-initiated GC signaling in LβT2 gonadotrope cells involving two related phosphoproteins: Ca(2+)/Calmodulin-dependent protein kinase II (CaMKII) and synapsin-I...
May 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28476946/in-vivo-calcium-signaling-during-synaptic-refinement-at-the-drosophila-neuromuscular-junction
#6
Fernando Vonhoff, Haig Keshishian
Neural activity plays a key role in pruning aberrant synapses in various neural systems, including the mammalian cortex, where low frequency (0.01 Hz) calcium oscillations refine topographic maps. However, the activity-dependent molecular mechanisms remain incompletely understood. Activity-dependent pruning also occurs at embryonic Drosophila neuromuscular junctions (NMJs), where low frequency Ca(2+) oscillations are required for synaptic refinement and the response to the muscle-derived chemorepellant Sema2a...
May 5, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28476660/%C3%AE-adrenergic-induced-sr-ca-2-leak-is-mediated-by-an-epac-nos-pathway
#7
Laëtitia Pereira, Dan J Bare, Samuel Galice, Thomas R Shannon, Donald M Bers
Cardiac β-adrenergic receptors (β-AR) and Ca(2+)-Calmodulin dependent protein kinase (CaMKII) regulate both physiological and pathophysiological Ca(2+) signaling. Elevated diastolic Ca(2+) leak from the sarcoplasmic reticulum (SR) contributes to contractile dysfunction in heart failure and to arrhythmogenesis. β-AR activation is known to increase SR Ca(2+) leak via CaMKII-dependent phosphorylation of the ryanodine receptor. Two independent and reportedly parallel pathways have been implicated in this β-AR-CaMKII cascade, one involving exchange protein directly activated by cAMP (Epac2) and another involving nitric oxide synthase 1 (NOS1)...
May 2, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28472663/kinetics-of-endogenous-camkii-required-for-synaptic-plasticity-revealed-by-optogenetic-kinase-inhibitor
#8
Hideji Murakoshi, Myung Eun Shin, Paula Parra-Bueno, Erzsebet M Szatmari, Akihiro C E Shibata, Ryohei Yasuda
No abstract text is available yet for this article.
May 3, 2017: Neuron
https://www.readbyqxmd.com/read/28460526/cationic-camkii-inhibiting-nanoparticles-prevent-allergic-asthma
#9
Angie S Morris, Sara C Sebag, John D Paschke, Amaraporn Wongrakpanich, Kareem Ebeid, Mark E Anderson, Isabella M Grumbach, Aliasger K Salem
Asthma is a common lung disease affecting over 300 million people worldwide and is associated with increased reactive oxygen species (ROS), eosinophilic airway inflammation, bronchoconstriction and mucus production. Targeting of novel therapeutic agents to the lungs of patients with asthma may improve efficacy of treatments and minimize side effects. We previously demonstrated that Ca2+/calmodulin-dependent protein kinase (CaMKII) is expressed and activated in the bronchial epithelium of asthmatic patients...
May 1, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28451724/chronic-loss-of-inhibitor-1-diminishes-cardiac-ryr2-phosphorylation-despite-exaggerated-camkii-activity
#10
Stefan Neef, Jordi Heijman, Kristian Otte, Matthias Dewenter, Ali R Saadatmand, Stefanie Meyer-Roxlau, Christopher L Antos, Johannes Backs, Dobromir Dobrev, Michael Wagner, Lars S Maier, Ali El-Armouche
Inhibitor-1 (I-1) modulates protein phosphatase 1 (PP1) activity and thereby counteracts the phosphorylation by kinases. I-1 is downregulated and deactivated in failing hearts, but whether its role is beneficial or detrimental remains controversial, and opposing therapeutic strategies have been proposed. Overactivity of Ca(2+)/calmodulin-dependent protein kinase II (CaMKII) with hyperphosphorylation of ryanodine receptors (RyR2) at the CaMKII-site is recognized to be central for heart failure and arrhythmias...
April 27, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/28450904/camkii-the-molecular-villain-that-aggravates-cardiovascular-disease
#11
Peiying Zhang
Pathological remodeling of the myocardium is an integral part of the events that lead to heart failure (HF), which involves altered gene expression, disturbed signaling pathways and altered Ca(2+) homeostasis and the players involved in this process. Of particular interest is the chronic activation of Ca(2+)/calmodulin-dependent protein kinase II (CaMKII) isoforms in heart, which further aggravate the injury to myocardium. Expression and activity of CaMKII have been found to be elevated in various conditions of stressed myocardium and in different heart diseases in both animal models as well as heart patients...
March 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28449373/biophysical-analysis-of-the-dynamics-of-calmodulin-interactions-with-neurogranin-and-ca2-calmodulin-dependent-kinase-ii
#12
Christian Seeger, Vladimir O Talibov, U Helena Danielson
Calmodulin (CaM) functions depend on interactions with CaM-binding proteins, regulated by Ca2+. Induced structural changes influence the affinity, kinetics, and specificities of the interactions. The dynamics of CaM interactions with neurogranin (Ng) and the CaM-binding region of Ca2+/calmodulin-dependent kinase II (CaMKII290-309 ) have been studied using biophysical methods. These proteins have opposite Ca2+ dependencies for CaM binding. Surface plasmon resonance biosensor analysis confirmed that Ca2+ and CaM interact very rapidly, and with moderate affinity ( KDSPR=3μM)...
April 27, 2017: Journal of Molecular Recognition: JMR
https://www.readbyqxmd.com/read/28437279/npy-impairs-cell-viability-and-mitochondrial-membrane-potential-through-ca2-and-p38-signaling-pathways-in-neonatal-rat-cardiomyocytes
#13
Jun Hu, Xuehua Xu, Yuanyi Zuo, Xiangting Gao, Yun Wang, Cunquan Xiong, Hongcheng Zhou, Shaohua Zhu
NPY is involved in stress cardiomyopathy (SCM). However, the associated mechanism for NPY-induced SCM remains unclear. In this study, we aimed to explore potential cell signaling pathways that are related to NPY-mediated cell viability in neonatal rat cardiomyocytes. We found that NPY induced cell viability suppression in cultured cardiomyocytes in a dose-dependent manner. After NPY treatment, the expression of CaN and p-CAMKII was increased significantly, and the phosphorylation of p38 but not ERK and JNK was detected...
April 18, 2017: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/28436159/the-mechanism-research-of-hypoxia-induced-increased-late-sodium-current-resulting-in-intracellular-ca-2-overload-in-ventricular-myocytes
#14
Chen Fu, Jie Hao, Mengliu Zeng, Yejia Song, Wanzhen Jiang, Peihua Zhang, Antao Luo, Zhenzhen Cao, Luiz Belardinelli, Jihua Ma
Hypoxia leads to augmentation of late sodium current (INa.L ) and cellular Na(+) loading, increased reverse Na(+) -Ca(2+) exchange current (reverse INCX ) and intracellular Ca(2+) loading in rabbit ventricular myocytes. The purpose of this study was to determine the intracellular signal transduction pathways involved in the modulation of INa.L during hypoxia in ventricular myocytes. Whole-cell and cell-attached patch clamp techniques were used to record INa.L , and the whole-cell mode was also used to record reverse INCX and to study intercellular signal transduction mechanisms that mediate the increased INa...
April 24, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28431968/cannabinoid-cb1-and-cb2-receptors-differentially-modulate-l-and-t-type-ca-2-channels-in-rat-retinal-ganglion-cells
#15
Wen-Jing Qian, Ning Yin, Feng Gao, Yanying Miao, Qian Li, Fang Li, Xing-Huai Sun, Xiong-Li Yang, Zhongfeng Wang
Endocannabinoid signaling system is involved in regulating multiple neuronal functions in the central nervous system by activating G-protein coupled cannabinoid CB1 and CB2 receptors (CB1Rs and CB2Rs). Growing evidence has shown that CB1Rs and CB2Rs are extensively expressed in retinal ganglion cells (RGCs). Here, modulation of L- and T-types Ca(2+) channels by activating CB1Rs and CB2Rs in RGCs was investigated. Triple immunofluorescent staining showed that L-type subunit CaV1.2 was co-localized with T-type subunits (CaV3...
April 18, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28430606/ketamine-administered-pregnant-rats-impair-learning-and-memory-in-offspring-via-the-creb-pathway
#16
Xinran Li, Cen Guo, Yanan Li, Lina Li, Yuxin Wang, Yiming Zhang, Yue Li, Yu Chen, Wenhan Liu, Li Gao
Ketamine has been reported to impair the capacity for learning and memory. This study examined whether these capacities were also altered in the offspring and investigated the role of the CREB signaling pathway in pregnant rats, subjected to ketamine-induced anesthesia. On the 14th day of gestation (P14), female rats were anesthetized for 3 h via intravenous ketamine injection (200 mg/Kg). Morris water maze task, contextual and cued fear conditioning, and olfactory tasks were executed between the 25th to 30th day after birth (B25-30) on rat pups, and rats were sacrificed on B30...
May 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28428622/inhibition-of-late-sodium-current-suppresses-calcium-related-ventricular-arrhythmias-by-reducing-the-phosphorylation-of-camk-ii-and-sodium-channel-expressions
#17
Xiao-Hong Wei, Shan-Dong Yu, Lu Ren, Si-Hui Huang, Qiao-Mei Yang, Ping Wang, Yan-Peng Chu, Wei Yang, Yan-Sheng Ding, Yong Huo, Lin Wu
Cardiac arrhythmias associated with intracellular calcium inhomeostasis are refractory to antiarrhythmic therapy. We hypothesized that late sodium current (I Na) contributed to the calcium-related arrhythmias. Monophasic action potential duration at 90% completion of repolarization (MAPD90) was significantly increased and ventricular arrhythmias were observed in hearts with increased intracellular calcium concentration ([Ca(2+)]i) by using Bay K 8644, and the increase became greater in hearts treated with a combination of ATX-II and Bay K 8644 compared to Bay K 8644 alone...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28423675/mir-219-5p-targets-camkii%C3%AE-to-attenuate-morphine-tolerance-in-rats
#18
Jian Wang, Wei Xu, Jiali Shao, Zhenghua He, Zhuofeng Ding, Jiangju Huang, Qulian Guo, Wangyuan Zou
Morphine tolerance is a clinical challenge in pain management. Emerging evidence suggests that microRNA (miRNA) plays a regulatory role in the development of morphine tolerance. miR-219-5p (miR-219) targets calmodulin-dependent protein kinase II γ (CaMKIIγ) to activate central pain sensitization via N-methyl-D-aspartate (NMDA) receptor. Therefore, we hypothesized that miR-219-5p attenuates morphine tolerance by targeting CaMKIIγ. We found that the expression of miR-219-5p was decreased significantly after chronic morphine treatment...
April 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28421673/endothelial-erbb4-deficit-induces-alterations-in-exploratory-behavior-and-brain-energy-metabolism-in-mice
#19
Gang Wu, Xiu-Xiu Liu, Nan-Nan Lu, Qi-Bing Liu, Yun Tian, Wei-Feng Ye, Guo-Jun Jiang, Rong-Rong Tao, Feng Han, Ying-Mei Lu
AIMS: The receptor tyrosine kinase ErbB4 is present throughout the primate brain and has a distinct functional profile. In this study, we investigate the potential role of endothelial ErbB4 receptor signaling in the brain. RESULTS: Here, we show that the endothelial cell-specific deletion of ErbB4 induces decreased exploratory behavior in adult mice. However, the water maze task for spatial memory and the memory reconsolidation test reveal no changes; additionally, we observe no impairment in CaMKII phosphorylation in Cdh5Cre;ErbB4(f/f) mice, which indicates that the endothelial ErbB4 deficit leads to decreased exploratory activity rather than direct memory deficits...
April 18, 2017: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/28404629/braf-signaling-principles-unveiled-by-large-scale-human-mutation-analysis-with-a-rapid-lentivirus-based-gene-replacement-method
#20
Chae-Seok Lim, Xi Kang, Vincent Mirabella, Huaye Zhang, Qian Bu, Yoichi Araki, Elizabeth T Hoang, Shiqiang Wang, Ying Shen, Sukwoo Choi, Bong-Kiun Kaang, Qiang Chang, Zhiping P Pang, Richard L Huganir, J Julius Zhu
Rapid advances in genetics are linking mutations on genes to diseases at an exponential rate, yet characterizing the gene mutation-cell behavior relationships essential for precision medicine remains a daunting task. More than 350 mutations on small GTPase BRaf are associated with various tumors, and ∼40 mutations are associated with the neurodevelopmental disorder cardio-facio-cutaneous syndrome (CFC). We developed a fast cost-effective lentivirus-based rapid gene replacement method to interrogate the physiopathology of BRaf and ∼50 disease-linked BRaf mutants, including all CFC-linked mutants...
March 15, 2017: Genes & Development
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