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Results 451 - 500 of 1920
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Han Ping - - 2007
TRPV1 is a non-selective cationic channel that is activated by capsaicin, acidic pH and thermal stimuli. Sustained TRPV1 channel activation causes severe cytotoxicity that leads to cell death. In this study, we investigated the mechanisms of capsaicin-induced cytotoxicity in HEK293 cells stably expressing TRPV1 with a focus on protein synthesis ...
Seta Yuji - - 2007
Aromatic L-amino acid decarboxylase (AADC) catalyses the decarboxylation of all aromatic L-amino acids. In mammals, AADC is expressed in many tissues besides the nervous system, and is associated with additional regulatory roles of dopamine and serotonin in a wide range of tissues. We examined the expression of AADC by using ...
Annavajjula, Vamsi Krishna
Lithium-ion batteries are the most commonly chosen power source for many portable applications. Advantages like high energy density, high nominal voltage, less maintenance, and low self discharge rate are the driving force behind this choice. Although they have many advantages, lithium-ion batteries have not been used in various applications because ...
S. W. Glunz
The current cost distribution of a crystalline silicon PV module is clearly dominated by material costs, especially by the costs of the silicon wafer. Therefore cell designs that allow the use of thinner wafers and the increase of energy conversion efficiency are of special interest to the PV industry. This ...
Raghib, Hala
The HERG gene encodes for the delayed rectifier K+ channel in human cardiac tissue and contributes to the repolarization phase of the ventricular action potential. Defects in its activity underlies a cardiac disorders linked to a prolongation in the QT interval known as acquired long QT syndrome. The channel has ...
Krishnan, Prasanna
The aim of this research was to observe how operating temperature affected output, and how spectral variation affected current matching for unique triple cells produced at Utrecht University (UU). It was important to use data and boundary conditions that would simulate Dutch weather conditions. The effect of cell operating temperature ...
Cremers, C.
Different aspects of the improvement of direct methanol fuel cell (DMFC) systems for portable power generation are investigated, in a project funded by the Bavarian state. The materials research focuses on the development of improved catalysts, in particular for the oxygen reduction reaction. Some recent results on supported ruthenium selenium ...
Fejtl Michael - - 2007
A conventional borosilicate glass patch pipette is glued into a plastic jacket, forming the entity of a FlipTip. One or two three-channel modules of recording tip sockets are mounted on a liquid handler platform to take up FlipTips. The tip sockets are connected to preamplifiers (HEKA) and to a suction ...
Osculati F - - 2007
Solitary chemosensory cells (SCCs), which resemble taste bud cells, are present in the epidermis and oropharynx of most primary aquatic vertebrates. Recent studies have led to the description of SCCs also in mammals too. In the airway and digestive apparatus, these elements form a diffuse chemosensory system. SCCs do not ...
Pajak Beata - - 2007
The aim of our study was to determine the expression of various isoforms of clusterin and to evaluate how etoposide or calcium chelators [ethylenediaminetetraacetic acid and (2-aminoethoxyethane)-N,N,N',N'-tetraacetic acid] affect the subcellular expressions of the 50-kDa isoform of clusterin protein in colon adenocarcinoma COLO 205 cells. We then determined how the ...
DeWeese Michael R - - 2007
In vivo whole-cell patch-clamp recording provides a means for measuring membrane currents and potentials from individual cells in the intact animal. Patch-clamp methods have largely been developed in vitro. This body of work has contributed enormously to the understanding of many important phenomena in excitable cells--including synaptic plasticity in the ...
Luo Y - - 2007
The outer sulcus cells are epithelial cells covering the luminal side of spiral sulcus of cochlea. It has been suggested that outer sulcus cells contribute to cation absorption from the lumen of the cochlea. We investigated the electrical properties and the effects of endothelin-1 (ET-1) on the outward potassium currents ...
Tran T A - - 2007
New clinical applications of ultrasound contrast microbubbles extend beyond imaging and diagnosis toward therapeutic applications. Cell membrane permeability and the uptake of substances have been shown to be enhanced by microbubbles under ultrasound stimulation. However, the mechanisms of action of ultrasound-activated microbubbles are still unknown. The aim of our study ...
Kaske Silke - - 2007
A growing number of TRP channels have been identified as key players in the sensation of smell, temperature, mechanical forces and taste. TRPM5 is known to be abundantly expressed in taste receptor cells where it participates in sweet, amino acid and bitter perception. A role of TRPM5 in other sensory ...
Wang Hai-Yan - - 2007
Recently, a novel type of anion channel activated by extracellular acidification has been found in a variety of mammalian cell types. However, the role of this acid-sensitive outwardly rectifying (ASOR) anion channel is not known. In human epithelial HeLa cells, reduction in extracellular pH below 5 rapidly activated anion-selective whole-cell ...
Ren Fu-xian - - 2006
BACKGROUND: The morphological and electrophysiological characteristics of cardiac cells in Koch triangle are still disputed. We studied the appearance and electrical properties of these diverse myocytes to elucidate their complex electrophysiological phenomena. METHODS: Experiments were conducted using cooled charge coupling device (CCD) system and whole cell, patch clamp technique to ...
Dumaine Robert - - 2007
The repolarization reserve determines the ability of drugs to prolong the cardiac action potential duration. Differences in K(+) currents between rabbit and dog cardiac Purkinje cells were studied by recording the transient outward K(+) current (I(to)) as well as the delayed rectifier K(+) currents (I(Ks) and I(Kr)) during repolarization. Purkinje ...
Miura Hirohito - - 2006
Mammalian taste buds are maintained through continuous cell renewal so that taste bud cells are constantly generated from progenitor cells throughout life. Taste bud cells are composed of basal cells and elongated cells. Elongated cells are derived from basal cells and contain taste receptor cells (TRC). Morphologically, elongated cells consist ...
Mistretta Charlotte M - - 2006
The fungiform papilla is a gustatory organ that provides a specific tissue residence for taste buds on the anterior tongue. Thus, during development there must be a progressive differentiation to acquire papilla epithelium, then taste cell progenitor epithelium, and finally taste cells within the papilla apex. Arranged in rows, the ...
Mellgren Ronald L - - 2007
Mammalian cells require extracellular calcium ion to undergo rapid plasma membrane repair seconds after mechanical damage. Utilizing transformed fibroblasts from calpain small subunit knock-out (Capns1-/-) mouse embryos, we now show that the heterodimeric, typical subclass of calpains is required for calcium-mediated survival after plasma membrane damage caused by scraping a ...
Lam Hung D - - 2006
Regulatory volume decrease and exocrine secretion studies suggest a functional relationship between K+ and organic anion efflux. To test the hypothesis that the expression of K+ channels and MRP1 is reciprocally related, we employed the patch clamp and RT-PCR techniques on weakly (H69) and strongly MRP1-expressing (H69AR) small cell lung ...
Serrano-Gotarredona Teresa - - 2006
This paper presents a very large scale integration (VLSI) implementation of a low-power current-mode fuzzy-adaptive resonance theory (ART) cell. The cell is based on a compact new current source multibit memory cell with online learning capability. A small prototype of the designed cell and its peripheral block has been fabricated ...
Palmer Lawrence G - - 2007
High-conductance (BK or maxi) K(+) channels were observed in cell-attached patches of the apical membrane of the isolated split-open rat connecting tubule (CNT). These channels were quite rare in cells identified visually as principal cells (PCs; 5/162 patches) but common in intercalated cells (ICs; 24/26 patches). The BK-expressing intercalated cells ...
Hoek Kristen L - - 2006
Functional peripheral mature follicular B (FoB) lymphocytes are thought to develop from immature transitional cells in a BCR-dependent manner. We have previously shown that BCR cross-linking in vitro results in death of early transitional (T1) B cells, whereas late transitional (T2) B cells survive and display phenotypic characteristics of mature ...
Tripathi P K - - 2006
This study addressed variation in the use-dependent inactivation (UDI) of high-threshold tetrodotoxin-resistant Na+ currents (TTX-R currents) and action potential firing behavior among acutely isolated rat dorsal root ganglion (DRG) cells. UDI was quantified as the percent decrease in current amplitude caused by increasing the current activation rate from 0.1-1.0 Hz ...
Bagnaresi Piero - - 2007
The ion calcium is a ubiquitous second messenger, present in all eukaryotic cells. It modulates a vast number of cellular events, such as cell division and differentiation, fertilization, cell volume, decodification of external stimuli. To process this variety of information, the cells display a number of calcium pools, which are ...
Zhanping Weng - - 2007
OBJECTIVES: To study the role of Voltage-gated potassium ion channels (Kv) in cell proliferation and cell cycle of ovarian cancer cell. METHODS: The effects of voltage-gate K+ channels on human ovarian cancer cell line (A2780 cell) proliferation and cell cycle were observed by means of MTT and flow cytometry. A ...
Gepstein Lior - - 2006
The recent advancements in stem cell biology, molecular and cell biology, and tissue engineering have paved the way to the development of a new biomedical discipline: regenerative medicine. The heart represents an attractive candidate for this emerging discipline since these emerging technologies could be used to potentially treat a variety ...
Okubo Tadashi - - 2006
Sox2 is expressed in basal epithelial cells of the tongue, with high levels in taste bud placodes, fungiform papillae, and mature taste cells, and low levels in filiform papillae. High Sox2 expression appears to lie downstream from canonical Wnt signaling. In hypomorphic Sox2(EGFP/LP) embryos, placodes form but no mature taste ...
Lau Adrian Y - - 2006
A novel open-access microfluidic patch-clamp array chip with lateral cell trapping sites raised above the bottom plane of the chip was developed by combining both a microscale soft-lithography and a macroscale polymer fabrication method. This paper demonstrates the capability of using such an open-access fluidic system for patch-clamp measurements. The ...
Kurata Yasutaka - - 2007
A cardiac biological pacemaker (BP) has been created by suppression of the inward rectifier K(+) current (I(K1)) or overexpression of the hyperpolarization-activated current (I(h)). We theoretically investigated the effects of incorporating I(h), T-type Ca(2+) current (I(Ca,T)), sustained inward current (I(st)), and/or low-voltage-activated L-type Ca(2+) channel current (I(Ca,LD)) on 1) creation ...
Mayo Elizabeth I - - 2006
Ir(III) dyes used as sensitizers in dye-sensitized solar cells produced quantum yields approaching unity for conversion of absorbed photons to current under simulated air mass 1.0 sunlight, with current production resulting from ligand-to-ligand charge-transfer states, rather than the typical metal-to-ligand charge-transfer states in ruthenium-based cells.
Pau Davide - - 2007
5-Hydroxytryptamine (5-HT) is proarrhythmic in atrial cells from patients in sinus rhythm (SR) via activation of 5-HT(4) receptors, but its effects in atrial cells from patients with atrial fibrillation (AF) are unknown. The whole-cell perforated patch-clamp technique was used to record L-type Ca(2+) current (I(CaL)), action potential duration (APD) and ...
Godin Nicolas - - 2007
TRPC proteins have been described as non-selective cation channels and are thought to be involved in the regulation of Ca(2+) movement in various cells, including airway smooth muscle (ASM) cells. In order to study the role of these channels in ASM cells, transfection of a small interfering RNA (siRNA) designed ...
Yoshida Ryusuke - - 2006
It is known that a subset of taste cells generate action potentials in response to taste stimuli. However, responsiveness of these cells to particular tastants remains unknown. In the present study, by using a newly developed extracellular recording technique, we recorded action potentials from the basolateral membrane of single receptor ...
Hou Zhonghuai - - 2006
We have studied the collective calcium signaling behavior of an array of coupled N cells, taking into account the internal noises resulting from the small cell size V. The system's performance was characterized by the reciprocal coefficient of variance (RCV) of the calcium spike train. Two system-size resonances were observed, ...
Seta Yuji - - 2006
Taste buds are multicellular receptor organs embedded in the lingual epithelium of vertebrates. Taste cells within these buds are modified epithelial cells as they lack axons and turnover rapidly throughout life, yet have neuronal properties enabling them to transduce taste stimuli and transmit this information to the nervous system. Taste ...
Blom Tomas - - 2006
We have previously shown that sphingosine inhibits depolarisation-induced calcium influx through voltage-operated calcium channels (VOCCs) in GH(4)C(1) cells, whereas sphingosine-1-phosphate (S1P) does not. In the present study we investigated whether sphingosine kinase modulates VOCC activity in GH(4)C(1) cells by removing inhibitory sphingosine. Sphingosine and the structurally similar sphingosine kinase inhibitor ...
Yamada Jun - - 2006
Microglia are reported to have alpha-amino-hydroxy-5-methyl-isoxazole-4-propionate/kainate (KA) types. However, only small population of primary cultured rat microglia (approximately 20%) responded to KA. In the present study, we have attempted to elucidate the regulatory mechanism of responsiveness to KA in GMIR1 rat microglial cell line. When the GMIR1 cells were plated ...
Numata Tomohiro - - 2007
Stretch- and swelling-activated cation (SSAC) channels play essential roles not only in sensing and transducing external mechanical stresses but also in regulating cell volume in living cells. However, the molecular nature of the SSAC channel has not been clarified. In human epithelial HeLa cells, single-channel recordings in cell-attached and inside-out ...
Luo Jialie - - 2006
In the present study, ATP-activated currents (I(ATP)s) recorded from rat trigeminal ganglion (TG) neurons using whole-cell patch clamp technique are classified into three types (F, I and S) based on the characteristics of their activation and desensitization. The time of rising phase (R(10-90)) of types F, I and S of ...
Chen Chihchen - - 2006
Ion channels play key roles in cell physiology and underlie a broad spectrum of disorders. To this day, the gold standard for studying ion channels is the patch clamp technique. Patch clamping involves careful positioning of a fine-tipped glass micropipette onto the surface of the cell to form a high-resistance ...
Canzoniero Lorella M T - - 2006
Polychlorinated biphenyls (PCB) are persistent environmental contaminants whose chronic exposure can affect nervous system development and function. The cellular and molecular mechanisms underlying neuronal damage are not yet clear. In the present study, we investigated whether nitric oxide (NO) could be involved in aroclor 1254 (A1254; a PCB mixture)-induced cytotoxicity ...
Christ Torsten - - 2006
Autoantibodies against the beta1-adrenoceptor (beta1-AAB) in the serum of patients with dilated cardiomyopathy (DCM) are associated with stimulatory effects at cardiac beta1-adrenoceptors. They enhance cardiomyocyte shortening and increase the amplitude of L-type Ca2+ current, ICa. However, in contrast to the unselective beta-adrenoceptor agonist (-)-isoprenaline, beta1-AAB produce positive responses in a ...
Sato Katsuya - - 2007
In adaptive bone remodeling, it is believed that bone cells such as osteoblasts, osteocytes and osteoclasts can sense mechanical stimuli and modulate their remodeling activities. However, the mechanosensing mechanism by which these cells sense mechanical stimuli and transduce mechanical signals into intracellular biochemical signals is still not clearly understood. From ...
Walker Dawn - - 2006
In this study we sought to develop a computational modeling paradigm in order to describe the influence of calcium on normal and transformed keratinocyte proliferation and differentiation. Keratinocytes and HaCat cells were grown in monolayer cultures with low and physiologic calcium concentrations, and levels of proliferation and involucrin expression were ...
Lee Jae Yeol - - 2006
This paper describes the preliminary biological results that novel T-type calcium channel blockers inhibit the growth of human cancer cells by blocking calcium influx into the cell, based on unknown mechanism on the cell cycle responsible for cellular proliferation. Among the selected compounds from compound library, compound 9c (KYS05041) was ...
Kuver Rahul - - 2006
Mucus of cystic fibrosis patients exhibits altered biochemical composition and biophysical behavior, but the causal relationships between altered cystic fibrosis transmembrane conductance regulator (CFTR) function and the abnormal mucus seen in various organ systems remain unclear. We used cultured gallbladder epithelial cells (GBEC) from wild-type and Cftr((-/-)) mice to investigate ...
Jacquemet Vincent - - 2006
Fibroblasts are nonexcitable cells that are sometimes coupled with excitable cells (cardiomyocytes). Due to a higher resting potential, these cells may act as a current source or sink and therefore disturb the electrical activity of the surrounding excitable cells. The possible occurrence of spontaneous pacemaker activity resulting from these electrotonic ...
Lee Seok Geun - - 2006
OBJECTIVE: To know the effect of adenosine 5'-triphosphate (ATP) on intracellular calcium level and cell proliferation in cervical cancer cells. STUDY DESIGN: Four different human cervical cancer cell lines (Caski, C33A, HeLaS3 and SiHa) were used in this study. The change of intracellular calcium level, cell proliferation and the activity ...
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