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https://www.readbyqxmd.com/read/28428534/expression-of-acid-sensing-ion-channels-in-renal-tubular-epithelial-cells-and-their-role-in-patients-with-henoch-sch%C3%A3-nlein-purpura-nephritis
#1
Li-Ping Yuan, Yan Bo, Zhang Qin, Hua Ran, Wang Li, Yu-Fei Li, Gui Ming
BACKGROUND Acid-sensing ion channels (ASICs) are ligand-gated cation channels activated by extracellular protons. However, the role of ASICs in kidney diseases remains uncertain. This study investigated ASICs expression in kidney tissues and their role in the development of Henoch-Schönlein purpura nephritis (HSPN). MATERIAL AND METHODS The expression of ASIC subunits was examined by immunochemical techniques in the kidney tissue from HSPN patients. Acid-induced ASICs expression in cultured renal tubular epithelial cells was determined by quantitative RT-PCR analysis...
April 21, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28396446/identification-of-a-cono-rfamide-from-the-venom-of-conus-textile-that-targets-asic3-and-enhances-muscle-pain
#2
Catharina Reimers, Cheng-Han Lee, Hubert Kalbacher, Yuemin Tian, Chih-Hsien Hung, Axel Schmidt, Lea Prokop, Silke Kauferstein, Dietrich Mebs, Chih-Cheng Chen, Stefan Gründer
Acid-sensing ion channels (ASICs) are proton-gated Na(+) channels that are expressed throughout the nervous system. ASICs have been implicated in several neuronal disorders, like ischemic stroke, neuronal inflammation, and pathological pain. Several toxins from venomous animals have been identified that target ASICs with high specificity and potency. These toxins are extremely useful in providing protein pharmacophores and to characterize function and structure of ASICs. Marine cone snails contain a high diversity of toxins in their venom such as conotoxins, which are short polypeptides stabilized by disulfide bonds, and conopeptides, which have no or only one disulfide bond...
April 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28395154/meta-analysis-of-depleted-uranium-levels-in-the-balkan-region
#3
Larisa Besic, Imer Muhovic, Adna Asic, Amina Kurtovic-Kozaric
In recent years, contradicting data has been published on the connection between the presence of depleted uranium and an increased cancer incidence among military personnel deployed in the Balkans during the 1992-1999 wars. This has led to numerous research articles investigating possible depleted uranium contamination of the afflicted regions of the Balkan Peninsula, namely Bosnia & Herzegovina, Serbia, Kosovo and Montenegro. The aim of this study was to collect data from previously published reports investigating the levels of depleted uranium in the Balkans and to present the data in the form of a meta-analysis...
April 7, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28391213/integration-of-low-power-asic-and-mems-sensors-for-monitoring-gastrointestinal-tract-using-a-wireless-capsule-system
#4
Md Shamsul Arefin, Jean-Michel Redoute, Mehmet Yuce
This paper presents a wireless capsule microsystem to detect and monitor pH, pressure, and temperature of the gastrointestinal (GI) tract in real-time. This research contributes to the integration of sensors (microfabricated capacitive pH, capacitive pressure, and resistive temperature sensors), frequency modulation and pulse-width modulation based interface IC circuits, microcontroller, and transceiver with meandered conformal antenna for the development of a capsule system. The challenges associated with the system miniaturization, higher sensitivity and resolution of sensors, and lower power consumption of interface circuits are addressed...
April 4, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28384246/proton-and-non-proton-activation-of-asic-channels
#5
Ivan Gautschi, Miguel Xavier van Bemmelen, Laurent Schild
The Acid-Sensing Ion Channels (ASIC) exhibit a fast desensitizing current when activated by pH values below 7.0. By contrast, non-proton ligands are able to trigger sustained ASIC currents at physiological pHs. To analyze the functional basis of the ASIC desensitizing and sustained currents, we have used ASIC1a and ASIC2a mutants with a cysteine in the pore vestibule for covalent binding of different sulfhydryl reagents. We found that ASIC1a and ASIC2a exhibit two distinct currents, a proton-induced desensitizing current and a sustained current triggered by sulfhydryl reagents...
2017: PloS One
https://www.readbyqxmd.com/read/28375388/asic-chipset-design-to-generate-block-based-complex-holographic-video
#6
Young-Ho Seo, Yoon-Hyuk Lee, Dong-Wook Kim
In this paper, we propose a new hardware architecture implemented as a very large scaled integrated circuit by using an application-specific integrated circuit technology, where block-based calculations are used to generate holograms. The proposed hardware is structured to produce a part of a hologram in the block units in parallel. A block of a hologram is calculated using an object point, and then the calculation is repeated for all object points to obtain intermediate results that are accumulated to produce the final block of a hologram...
March 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28332558/multiple-h-sensors-mediate-the-extracellular-acidification-induced-ca-2-i-elevation-in-cultured-rat-ventricular-cardiomyocytes
#7
Yuan-Lang Hu, Xue Mi, Chao Huang, Hui-Fang Wang, Jian-Ren Song, Qing Shu, Lan Ni, Jian-Guo Chen, Fang Wang, Zhuang-Li Hu
Acidosis has been known to cause "Ca(2+) transients", however, the mechanism is still uncertain. Here, we demonstrated that multiple H(+) sensors, such as ASICs, TRPV1 and proton-sensing G protein coupled receptors (GPCRs) are involved in extracellular acidification-induced intracellular calcium ([Ca(2+)]i) elevation. By using calcium imaging measures, we observed that both ASIC and TRPV1 channels inhibitors suppressed the [Ca(2+)]i elevation induced by extracellular acidosis in cultured rat cardiac myocytes...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28327374/discovery-and-molecular-interaction-studies-of-a-highly-stable-tarantula-peptide-modulator-of-acid-sensing-ion-channel-1
#8
REVIEW
Sing Yan Er, Ben Cristofori-Armstrong, Pierre Escoubas, Lachlan D Rash
Acute pharmacological inhibition of acid-sensing ion channel 1a (ASIC1a) is efficacious in rodent models in alleviating symptoms of neurological diseases such as stroke and multiple sclerosis. Thus, ASIC1a is a promising therapeutic target and selective ligands that modulate it are invaluable research tools and potential therapeutic leads. Spider venoms have provided an abundance of voltage-gated ion channel modulators, however, only one ASIC modulator (PcTx1) has so far been isolated from this source. Here we report the discovery, characterization, and chemical stability of a second spider venom peptide that potently modulates ASIC1a and ASIC1b, and investigate the molecular basis for its subtype selectivity...
March 18, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28321113/acid-sensing-ion-channel-1a-in-the-amygdala-is-involved-in-pain-and-anxiety-related-behaviours-associated-with-arthritis
#9
Youssef Aissouni, Abderrahim El Guerrab, Al Mahdy Hamieh, Jérémy Ferrier, Maryse Chalus, Diane Lemaire, Stéphanie Grégoire, Monique Etienne, Alain Eschalier, Denis Ardid, Eric Lingueglia, Fabien Marchand
Chronic pain is associated with anxiety and depression episodes. The amygdala plays a key role in the relationship between emotional responses and chronic pain. Here, we investigated the role of Acid-Sensing Ion Channels 1a within the basolateral amygdala (BLA), in pain and associated anxiety in a rat model of monoarthritis (MoAr). Administration within the BLA of PcTx1 or mambalgin-1, two specific inhibitors of ASIC1a-containing channels significantly inhibited pain and anxiety-related behaviours in MoAr rats...
March 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28320963/conformational-dynamics-and-role-of-the-acidic-pocket-in-asic-ph-dependent-gating
#10
Sabrina Vullo, Gaetano Bonifacio, Sophie Roy, Niklaus Johner, Simon Bernèche, Stephan Kellenberger
Acid-sensing ion channels (ASICs) are proton-activated Na(+) channels expressed in the nervous system, where they are involved in learning, fear behaviors, neurodegeneration, and pain sensation. In this work, we study the role in pH sensing of two regions of the ectodomain enriched in acidic residues: the acidic pocket, which faces the outside of the protein and is the binding site of several animal toxins, and the palm, a central channel domain. Using voltage clamp fluorometry, we find that the acidic pocket undergoes conformational changes during both activation and desensitization...
April 4, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28298159/biological-behavior-of-human-nucleus-pulposus-mesenchymal-stem-cells-in-response-to-changes-in-the-acidic-environment-during-intervertebral-disc-degeneration
#11
Jianjun Liu, Hui Tao, Cailiang Shen, Xiaoying Liu, Hanbang Wang, Fulong Dong, Renjie Zhang, Jie Li, Peng Ge, Peiwen Song, Huaqing Zhang, Peng Xu
An acidic environment is vital for the maintenance of cellular activities but can be affected tremendously during intervertebral disc degeneration. The effect of changes in the acidity of the environment on human nucleus pulposus mesenchymal stem cells (NP-MSCs) is unknown, however. Thus, this study aimed to observe the biological effects of acidic conditions mimicking a degenerated intervertebral disc on NP-MSCs in vitro. NP-MSCs were isolated from patients with lumbar disc herniation and were further identified by their immunophenotypes and multilineage differentiation...
March 16, 2017: Stem Cells and Development
https://www.readbyqxmd.com/read/28268670/a-distributed-current-stimulator-asic-for-high-density-neural-stimulation
#12
Jeong Hoan Park, Chaebin Kim, Seung-Hee Ahn, Tae Mok Gwon, Joonsoo Jeong, Sang Beom Jun, Sung June Kim
This paper presents a novel distributed neural stimulator scheme. Instead of a single stimulator ASIC in the package, multiple ASICs are embedded at each electrode site for stimulation with a high density electrode array. This distributed architecture enables the simplification of wiring between electrodes and stimulator ASIC that otherwise could become too complex as the number of electrode increases. The individual ASIC chip is designed to have a shared data bus that independently controls multiple stimulating channels...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28265090/deactivation-kinetics-of-acid-sensing-ion-channel-1a-are-strongly-ph-sensitive
#13
David M MacLean, Vasanthi Jayaraman
Acid-sensing ion channels (ASICs) are trimeric cation-selective ion channels activated by protons in the physiological range. Recent reports have revealed that postsynaptically localized ASICs contribute to the excitatory postsynaptic current by responding to the transient acidification of the synaptic cleft that accompanies neurotransmission. In response to such brief acidic transients, both recombinant and native ASICs show extremely rapid deactivation in outside-out patches when jumping from a pH 5 stimulus to a single resting pH of 8...
March 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28259560/4-chlorophenylguanidine-is-an-asic3-agonist-and-positive-allosteric-modulator
#14
Amruta S Agharkar, Eric B Gonzales
Acid-sensing ion channels (ASICs) are proton-sensitive sodium channels that open in response to lowered extracellular pH and are expressed in the central and peripheral nervous systems. The ASIC3 subtype is found primarily in the periphery where the channel mediates pain signals caused by ischemia and inflammation. Here, we provide identify 4-chlorophenylguanidine (4-CPG) as an ASIC3 positive allosteric modulator and newest member of the growing group of guanidine modulators of ASICs. Furthermore, the 4-CPG reversed the effects of ASIC3 desensitization...
February 17, 2017: Journal of Pharmacological Sciences
https://www.readbyqxmd.com/read/28249502/a-novel-cmos-transducer-for-giant-magnetoresistance-sensors
#15
Van Su Luong, Chih-Cheng Lu, Jing-Wen Yang, Jen-Tzong Jeng
In this work, an ASIC (application specific integrated circuits) transducer circuit for field modulated giant magnetoresistance (GMR) sensors was designed and fabricated using a 0.18-μm CMOS process. The transducer circuits consist of a frequency divider, a digital phase shifter, an instrument amplifier, and an analog mixer. These comprise a mix of analog and digital circuit techniques. The compact chip size of 1.5 mm × 1.5 mm for both analog and digital parts was achieved using the TSMC18 1P6M (1-polysilicon 6-metal) process design kit, and the characteristics of the system were simulated using an HSpice simulator...
February 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28249488/a-cmos-application-specified-integrated-circuit-for-40-ghz-high-electron-mobility-transistors-automatic-biasing
#16
M De Matteis, M De Blasi, E A Vallicelli, M Zannoni, M Gervasi, A Bau, A Passerini, A Baschirotto
This paper presents the design and the experimental results of a CMOS Automatic Control System (ACS) for the biasing of High-Electron-Mobility-Transistors (HEMT). The ACS is the first low-power mixed-signal Application-Specified-Integrated-Circuit (ASIC) able to automatically set and regulate the operating point of an off-chip 6 HEMT Low-Noise-Amplifiers (LNAs), hence it composes a two-chip system (the ACS+LNAs) to be used in the Large Scale Polarization Explorer (LSPE) stratospheric balloon for Cosmic Microwave Background (CMB) signal observation...
February 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28237818/quercetin-inhibits-acid-sensing-ion-channels-through-a-putative-binding-site-in-the-central-vestibular-region
#17
Mohona Mukhopadhyay, Anurag Singh, S Sachchidanand, Amal Kanti Bera
Acid-sensing ion channels (ASICs) are associated with many pathophysiological processes, such as neuronal death during ischemic stroke, epileptic seizure and nociception. However, there is a dearth of ASIC-specific therapeutic blockers. Here we report that quercetin, a plant flavonoid, which is known for its neuroprotective effect, reversibly inhibits homomeric rat ASIC1a, ASIC2a and ASIC3 with an IC50 of about 2µM. Also, quercetin prevents low pH-induced intracellular calcium rise and cell death in HEK-293 cells, which have endogenous expression of ASIC1a and 2a...
February 22, 2017: Neuroscience
https://www.readbyqxmd.com/read/28226854/a-distributed-current-stimulator-asic-for-high-density-neural-stimulation
#18
Jeong Hoan Park, Chaebin Kim, Seung-Hee Ahn, Tae Mok Gwon, Joonsoo Jeong, Sang Beom Jun, Sung June Kim, Jeong Hoan Park, Chaebin Kim, Seung-Hee Ahn, Tae Mok Gwon, Joonsoo Jeong, Sang Beom Jun, Sung June Kim, Sung June Kim, Joonsoo Jeong, Sang Beom Jun, Tae Mok Gwon, Chaebin Kim, Seung-Hee Ahn, Jeong Hoan Park
This paper presents a novel distributed neural stimulator scheme. Instead of a single stimulator ASIC in the package, multiple ASICs are embedded at each electrode site for stimulation with a high density electrode array. This distributed architecture enables the simplification of wiring between electrodes and stimulator ASIC that otherwise could become too complex as the number of electrode increases. The individual ASIC chip is designed to have a shared data bus that independently controls multiple stimulating channels...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28212098/a-2-5-mw-ch-50-mcps-10-analog-channel-adaptively-biased-read-out-front-end-ic-with-low-intrinsic-timing-resolution-for-single-photon-time-of-flight-pet-applications-with-time-dependent-noise-analysis-in-90-nm-cmos
#19
Hugo Cruz, Hong-Yi Huang, Ching-Hsing Luo, Shuenn-Yuh Lee
This paper presents a 10-channel time-of-flight application-specific integrated circuit (ASIC) for positron emission tomography in a 90 nm standard CMOS process. To overcome variations in channel-to-channel timing resolution caused by mismatch and process variations, adaptive biases and a digital-to-analog converter (DAC) are utilized. The main contributions of this work are as follows. First, multistage architectures reduce the total power consumption, and detection bandwidths of analog preamplifiers and comparators are increased to 1 and 1...
April 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28211811/acidity-and-acid-sensing-ion-channels-in-the-normal-and-alzheimer-s-disease-brain
#20
Eric B Gonzales, Nathalie Sumien
Alzheimer's disease prevalence has reached epidemic proportion with very few treatment options, which are associated with a multitude of side effects. A potential avenue of research for new therapies are protons, and their associated receptor: acid-sensing ion channels (ASIC). Protons are often overlooked neurotransmitters, and proton-gated currents have been identified in the brain. Furthermore, ASICs have been determined to be crucial for proper brain function. While there is more work to be done, this review is intended to highlight protons as neurotransmitters and their role along with the role of ASICs within physiological functioning of the brain...
February 15, 2017: Journal of Alzheimer's Disease: JAD
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