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https://www.readbyqxmd.com/read/28944724/rapid-prototyping-of-a-cyclic-olefin-copolymer-microfluidic-device-for-automated-oocyte-culturing
#1
Miguel Berenguel-Alonso, Maria Sabés-Alsina, Roser Morató, Oriol Ymbern, Laura Rodríguez-Vázquez, Oriol Talló-Parra, Julián Alonso-Chamarro, Mar Puyol, Manel López-Béjar
Assisted reproductive technology (ART) can benefit from the features of microfluidic technologies, such as the automation of time-consuming labor-intensive procedures, the possibility to mimic in vivo environments, and the miniaturization of the required equipment. To date, most of the proposed approaches are based on polydimethylsiloxane (PDMS) as platform substrate material due to its widespread use in academia, despite certain disadvantages, such as the elevated cost of mass production. Herein, we present a rapid fabrication process for a cyclic olefin copolymer (COC) monolithic microfluidic device combining hot embossing-using a low-temperature cofired ceramic (LTCC) master-and micromilling...
October 2017: SLAS Technology
https://www.readbyqxmd.com/read/28916724/a-novel-mechanism-for-ca-2-calmodulin-dependent-protein-kinase-ii-targeting-to-l-type-ca-2-channels-that-initiates-long-range-signaling-to-the-nucleus
#2
Xiaohan Wang, Christian R Marks, Tyler L Perfitt, Terunaga Nakagawa, Amy Lee, David A Jacobson, Roger J Colbran
Neuronal excitation can induce new mRNA transcription, a phenomenon called excitation-transcription (E-T) coupling. Among several pathways implicated in E-T coupling, activation of voltage-gated L-type Ca(2+) channels (LTCCs) in the plasma membrane can initiate a signaling pathway that ultimately increases nuclear CREB phosphorylation and, in most cases, expression of immediate early genes. Initiation of this long-range pathway has been shown to require recruitment of Ca(2+)-sensitive enzymes to a nanodomain in the immediate vicinity of the LTCC by an unknown mechanism...
September 15, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28859158/metabolic-inhibition-reduces-cardiac-l-type-ca2-channel-current-due-to-acidification-caused-by-atp-hydrolysis
#3
Giedrius Kanaporis, Rimantas Treinys, Rodolphe Fischmeister, Jonas Jurevičius
Metabolic stress evoked by myocardial ischemia leads to impairment of cardiac excitation and contractility. We studied the mechanisms by which metabolic inhibition affects the activity of L-type Ca2+ channels (LTCCs) in frog ventricular myocytes. Metabolic inhibition induced by the protonophore FCCP (as well as by 2,4- dinitrophenol, sodium azide or antimycin A) resulted in a dose-dependent reduction of LTCC current (ICa,L) which was more pronounced during β-adrenergic stimulation with isoprenaline. ICa,L was still reduced by metabolic inhibition even in the presence of 3 mM intracellular ATP, or when the cell was dialysed with cAMP or ATP-γ-S to induce irreversible thiophosphorylation of LTCCs, indicating that reduction in ICa,L is not due to ATP depletion and/or reduced phosphorylation of the channels...
2017: PloS One
https://www.readbyqxmd.com/read/28830723/selective-recovery-of-silver-from-waste-low-temperature-co-fired-ceramic-and-valorization-through-silver-nanoparticle-synthesis
#4
Basudev Swain, Dongyoon Shin, So Yeong Joo, Nak Kyoon Ahn, Chan Gi Lee, Jin-Ho Yoon
Considering the value of silver metal and silver nanoparticles, the waste generated during manufacturing of low temperature co-fired ceramic (LTCC) were recycled through the simple yet cost effective process by chemical-metallurgy. Followed by leaching optimization, silver was selectively recovered through precipitation. The precipitated silver chloride was valorized though silver nanoparticle synthesis by a simple one-pot greener synthesis route. Through leaching-precipitation optimization, quantitative selective recovery of silver chloride was achieved, followed by homogeneous pure silver nanoparticle about 100nm size were synthesized...
August 19, 2017: Waste Management
https://www.readbyqxmd.com/read/28708381/microfabrication-of-monolithic-microfluidic-platforms-using-low-temperature-co-fired-ceramics-suitable-for-fluorescence-imaging
#5
Pedro Couceiro, Julián Alonso-Chamarro
In this work, the influence of laser ablation and lamination parameters in the fabrication of embedded microstructures using Low Temperature Co-Fired Ceramics, have been studied. First, the influence of laser ablation parameters in the dimensions of fabricated microchannels in Low Temperature Co-Fired Ceramics substrates was characterized and strategies for tailoring the microchannels aspect ratios are described. The influence of lamination conditions on the fabrication of monolithically embedded microstructures is presented...
September 5, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28697452/effect-of-fluoride-exposure-on-mrna-expression-of-cav1-2-and-calcium-signal-pathway-apoptosis-regulators-in-pc12-cells
#6
Qiuxia Liao, Rui Zhang, Xiaoyu Wang, Weiwei Nian, Lulu Ke, Wei Ouyang, Zigui Zhang
This study investigated the effects of fluoride exposure on the mRNA expression of Cav1.2 calcium signaling pathway and apoptosis regulatory molecules in PC12 cells. The viability of PC12 cell receiving high fluoride (5.0mM) and low fluoride (0.5mM) alone or fluoride combined with L-type calcium channel (LTCC) agonist/inhibitor (5umol/L FPL6417/2umol/L nifedipine) was detected using cell counting kit-8 at different time points (2, 4, 6, 8, 12, 10, and 24h). Changes in the cell configuration were observed after exposing the cells to fluoride for 24h...
June 30, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28669898/relevance-of-tissue-specific-subunit-expression-in-channelopathies
#7
REVIEW
Hartwig Seitter, Alexandra Koschak
Channelopathies are a diverse group of human disorders that are caused by mutations in genes coding for ion channels or channel-regulating proteins. Several dozen channelopathies have been identified that involve both non-excitable cells as well as electrically active tissues like brain, skeletal and smooth muscle or the heart. In this review, we start out from the general question which ion channel genes are expressed tissue-selectively. We mined the human gene expression database Human Protein Atlas (HPA) for tissue-enriched ion channel genes and found 85 genes belonging to the ion channel families...
June 29, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28648030/-effect-and-mechanism-of-intermittent-alkaline-stimulation-on-high-phosphorus-induced-calcification-in-vascular-smooth-muscle-cells-of-rats
#8
Y L Bai, J S Xu, T Tian, J X Zhang, L W Cui, H R Zhang, S L Zhang
Objective: To explore the effect and possible mechanisms of intermittent alkaline on rat vascular smooth muscle cells (VSMCs) calcification induced by high phosphorus. Methods: VSMCs were isolated from rat thoracic aorta and cultured in vitro. The fourth generation VSMCs were randomly divided into control group, high phosphorus+ pH7.4, high phosphorus+ pH7.5, high phosphorus+ pH7.6 and high phosphorus+ pH7.7 group with random number table. The control group was cultured in DMEM with 10% fetal bovine serum. Other groups were cultured in DMEM with 10 mmol/L β-glycerophosphate and alkalized by 7...
June 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/28631947/predominant-contribution-of-l-type-cav1-2-channel-stimulation-to-impaired-intracellular-calcium-and-cerebral-artery-vasoconstriction-in-diabetic-hyperglycemia
#9
Stefano Morotti, Madeline Nieves-Cintrón, Matthew A Nystoriak, Manuel F Navedo, Eleonora Grandi
Enhanced L-type Ca(2+) channel (LTCC) activity in arterial myocytes contributes to vascular dysfunction during diabetes. Modulation of LTCC activity under hyperglycemic conditions could result from membrane potential-dependent and independent mechanisms. We have demonstrated that elevations in extracellular glucose (HG), similar to hyperglycemic conditions during diabetes, stimulate LTCC activity through phosphorylation of CaV1.2 at serine 1928. Prior studies have also shown that HG can suppress the activity of K(+) channels in arterial myocytes, which may contribute to vasoconstriction via membrane depolarization...
July 4, 2017: Channels
https://www.readbyqxmd.com/read/28600562/influence-of-w-substitution-on-crystal-structure-phase-evolution-and-microwave-dielectric-properties-of-na0-5bi0-5-moo4-ceramics-with-low-sintering-temperature
#10
Li-Xia Pang, Di Zhou, Ze-Ming Qi, Zhen-Xing Yue
In this work, the (Na0.5Bi0.5)(Mo1-xWx)O4 (x = 0.0, 0.5 and 1.0) ceramics were prepared via solid state reaction method. All the samples can be well densified at sintering temperature about ~720 °C. Dense and homogeneous microstructure with grain size lying between 2~8 μm can be observed from scanning electron microscopy (SEM). Microwave dielectric permittivity of the (Na0.5Bi0.5)(Mo0.5W0.5)O4 ceramic was found to be temperature-independent in a wide range between 25~120 °C with a temperature coefficient of frequency (TCF) ~-6 ppm/°C, a permittivity ~28...
June 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28592699/lower-affinity-of-isradipine-for-l-type-ca-2-channels-during-substantia-nigra-dopamine-neuron-like-activity-implications-for-neuroprotection-in-parkinson-s-disease
#11
Nadine J Ortner, Gabriella Bock, Antonios Dougalis, Maria Kharitonova, Johanna Duda, Simon Hess, Petronel Tuluc, Thomas Pomberger, Nadia Stefanova, Florian Pitterl, Thomas Ciossek, Herbert Oberacher, Henning J Draheim, Peter Kloppenburg, Birgit Liss, Jörg Striessnig
Ca(2+)-influx through L-type Ca(2+)-channels (LTCCs) is associated with activity-related stressful oscillations of Ca(2+) levels within dopaminergic (DA) neurons in the substantia nigra (SN), which may contribute to their selective degeneration in Parkinson's disease (PD). LTCC blockers were neuroprotective in mouse neurotoxin models of PD, and isradipine is currently undergoing testing in a phase III clinical trial in early PD. We report no evidence for neuroprotection by in vivo pretreatment with therapeutically relevant isradipine plasma levels, or Cav1...
July 12, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28568606/coupling-of-excitation-to-ca-2-release-is-modulated-by-dysferlin
#12
Valeriy Lukyanenko, Joaquin M Muriel, Robert J Bloch
KEY POINTS: Dysferlin, the protein missing in limb girdle muscular dystrophy 2B and Miyoshi myopathy, concentrates in transverse tubules of skeletal muscle, where it stabilizes voltage-induced Ca(2+) transients against loss after osmotic shock injury (OSI). Local expression of dysferlin in dysferlin-null myofibres increases transient amplitude to control levels and protects them from loss after OSI. Inhibitors of ryanodine receptors (RyR1) and L-type Ca(2+) channels protect voltage-induced Ca(2+) transients from loss; thus both proteins play a role in injury in dysferlin's absence...
August 1, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28534086/neuronal-nitric-oxide-synthase-modulation-of-intracellular-ca-2-handling-overrides-fatty-acid-potentiation-of-cardiac-inotropy-in-hypertensive-rats
#13
Chun Li Jin, Ming Zhe Yin, Jin Chul Paeng, Seunggyun Ha, Jeong Hoon Lee, Peng Jin, Chun Zi Jin, Zai Hao Zhao, Yue Wang, Keon Wook Kang, Chae Hun Leem, Jong-Wan Park, Sung Joon Kim, Yin Hua Zhang
Cardiac neuronal nitric oxide synthase (nNOS) is an important molecule that regulates intracellular Ca(2+) homeostasis and contractility of healthy and diseased hearts. Here, we examined the effects of nNOS on fatty acid (FA) regulation of left ventricular (LV) myocyte contraction in sham and angiotensin II (Ang II)-induced hypertensive (HTN) rats. Our results showed that palmitic acid (PA, 100 μM) increased the amplitudes of sarcomere shortening and intracellular ATP in sham but not in HTN despite oxygen consumption rate (OCR) was increased by PA in both groups...
May 22, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28521299/isradipine-attenuates-mptp-induced-dopamine-neuron-degeneration-by-inhibiting-up-regulation-of-l-type-calcium-channels-and-iron-accumulation-in-the-substantia-nigra-of-mice
#14
Qi-Min Wang, Yu-Yu Xu, Shang Liu, Ze-Gang Ma
The aim of this study is to investigate the effects of L-type calcium channels (LTCCs) on MPTP-induced dopamine (DA) neuron degeneration and iron accumulation in the substantia nigra (SN) of mice. By real-time PCR and western blots, we first quatified expressions of L-type Cav1.2 and Cav1.3 calcium channel α1 subunits in the SN of experimental mice treated with MPTP. We found that the expressions of Cav1.2 and Cav1.3 calcium channel α1 subunits markedly increased after MPTP treatment for 2 and 3 weeks. Secondly, we observed the effects of isradipine, a LTCC antagonist, on MPTP-induced DA neuron degeneration and iron accumulation in the SN...
July 18, 2017: Oncotarget
https://www.readbyqxmd.com/read/28497380/from-gene-to-behavior-l-type-calcium-channel-mechanisms-underlying-neuropsychiatric-symptoms
#15
REVIEW
Zeeba D Kabir, Arlene Martínez-Rivera, Anjali M Rajadhyaksha
The L-type calcium channels (LTCCs) Cav1.2 and Cav1.3, encoded by the CACNA1C and CACNA1D genes, respectively, are important regulators of calcium influx into cells and are critical for normal brain development and plasticity. In humans, CACNA1C has emerged as one of the most widely reproduced and prominent candidate risk genes for a range of neuropsychiatric disorders, including bipolar disorder (BD), schizophrenia (SCZ), major depressive disorder, autism spectrum disorder, and attention deficit hyperactivity disorder...
July 2017: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/28458279/regulatory-mechanism-of-mast-cell-activation-by-zinc-signaling
#16
REVIEW
Keigo Nishida, Ryota Uchida
Mast cells are hematopoietic-lineage cells that participate in immunoglobulin E (IgE)-associated immune responses, including allergic reactions and parasite resistance. Recent studies have shown that zinc (Zn) ion can behave as an intracellular signaling molecule and that Zn is involved in mast cell activation. We demonstrated that mast cells stimulated through the high-affinity IgE receptor (FcεRI) rapidly release intracellular Zn from the endoplasmic reticulum (ER), and we named this phenomenon the "Zn wave"...
2017: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
https://www.readbyqxmd.com/read/28453742/blinded-contractility-analysis-in-hipsc-cardiomyocytes-in-engineered-heart-tissue-format-comparison-with-human-atrial-trabeculae
#17
Ingra Mannhardt, Alexandra Eder, Berengere Dumotier, Maksymilian Prondzynski, Elisabeth Krämer, Martin Traebert, Klaus-Dieter Söhren, Frederik Flenner, Konstantina Stathopoulou, Marc D Lemoine, Lucie Carrier, Torsten Christ, Thomas Eschenhagen, Arne Hansen
Human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CM) may serve as a new assay for drug testing in a human context, but their validity particularly for the evaluation of inotropic drug effects remains unclear. In this blinded analysis, we compared the effects of 10 indicator compounds with known inotropic effects in electrically stimulated (1.5 Hz) hiPSC-CM-derived 3-dimensional engineered heart tissue (EHT) and human atrial trabeculae (hAT). Human EHTs were prepared from iCell hiPSC-CM, hAT obtained at routine heart surgery...
July 1, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28402855/stim1-ca-2-sensor-control-of-l-type-ca-2-channel-dependent-dendritic-spine-structural-plasticity-and-nuclear-signaling
#18
Philip J Dittmer, Angela R Wild, Mark L Dell'Acqua, William A Sather
Potentiation of synaptic strength relies on postsynaptic Ca(2+) signals, modification of dendritic spine structure, and changes in gene expression. One Ca(2+) signaling pathway supporting these processes routes through L-type Ca(2+) channels (LTCC), whose activity is subject to tuning by multiple mechanisms. Here, we show in hippocampal neurons that LTCC inhibition by the endoplasmic reticulum (ER) Ca(2+) sensor, stromal interaction molecule 1 (STIM1), is engaged by the neurotransmitter glutamate, resulting in regulation of spine ER structure and nuclear signaling by the NFATc3 transcription factor...
April 11, 2017: Cell Reports
https://www.readbyqxmd.com/read/28402392/caveolae-localized-l-type-ca2-channels-do-not-contribute-to-function-or-hypertrophic-signalling-in-the-mouse-heart
#19
Robert N Correll, Catherine A Makarewich, Hongyu Zhang, Chen Zhang, Michelle A Sargent, Allen J York, Remus M Berretta, Xiongwen Chen, Steven R Houser, Jeffery D Molkentin
Aims: L-type Ca2+ channels (LTCCs) in adult cardiomyocytes are localized to t-tubules where they initiate excitation-contraction coupling. Our recent work has shown that a subpopulation of LTCCs found at the surface sarcolemma in caveolae of adult feline cardiomyocytes can also generate a Ca2+ microdomain that activates nuclear factor of activated T-cells signaling and cardiac hypertrophy, although the relevance of this paradigm to hypertrophy regulation in vivo has not been examined...
June 1, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28370799/through-modulation-of-cardiac-ca-2-handling-ucp2-affects-cardiac-electrophysiology-and-influences-the-susceptibility-for-ca-2-mediated-arrhythmias
#20
Robert Larbig, Sara Reda, Vera Paar, Andrea Trost, Johannes Leitner, Stephanie Weichselbaumer, Karolina A Motloch, Bernhard Wernly, Andreas Arrer, Benjamin Strauss, Michael Lichtenauer, Herbert A Reitsamer, Lars Eckardt, Guiscard Seebohm, Uta C Hoppe, Lukas J Motloch
Introduction UCP2 belongs to a superfamily of mitochondrial ion transporters. Due to its beneficial influence on production of reactive oxygen species it is suggested to reduce cardiac ischemic reperfusion injury. Recent studies uncovered its ability to regulate mitochondrial Ca(2+) -uptake and therefore to influence cardiac cytosolic Ca(2+) -handling, indicating compensatory pathways to avoid toxic Ca(2+) -overload in UCP2 knock-out mice (UCP2(-/-) ). However, the specific mechanisms and their impact on cardiac electrophysiology remain speculative...
March 31, 2017: Experimental Physiology
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