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1.

001-es BibID:BIBFORM083084
Első szerző:Bányász Tamás (élettanász)
Cím:Individual Cell Electrophysiology (ICE) of Cardiac Myocytes _ Using Innovative 'Onion-Peeling' Technique to Study the ICE of Excitable Cells / Banyasz Tamas, Jian Zhong, Horvath Balazs, Izu Leighton T., Chen-Izu Ye
Dátum:2012
ISSN:0006-3495
Tárgyszavak:Orvostudományok Elméleti orvostudományok idézhető absztrakt
folyóiratcikk
Megjelenés:Biophysical Journal. - 102 : 3 (2012), p. 544a. -
További szerzők:Jian, Zhong Horváth Balázs (1981-) (élettanász) Izu, Leighton T. Chen-Izu, Ye
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2.

001-es BibID:BIBFORM073604
Első szerző:Bányász Tamás (élettanász)
Cím:Beta-adrenergic stimulation reverses the I Kr-I Ks dominant pattern during cardiac action potential / Tamas Banyasz, Zhong Jian, Balazs Horvath, Shaden Khabbaz, Leighton T. Izu, Ye Chen-Izu
Dátum:2014
ISSN:0031-6768
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Pflugers Archiv-European Journal of Physiology. - 466 : 11 (2014), p. 2067-2076. -
További szerzők:Jian, Zhong Horváth Balázs (1981-) (élettanász) Khabbaz, Shaden Izu, Leighton T. Chen-Izu, Ye
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3.

001-es BibID:BIBFORM055068
Első szerző:Bányász Tamás (élettanász)
Cím:An emerging antiarrhythmic target : late sodium current / Banyasz T., Szentandrássy N., Magyar J., Szabo Z., Nánási P. P., Chen-Izu Y., Izu L. T.
Dátum:2015
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Current Pharmacological Design. - 21 : 8 (2015), pp. 1073-1090. -
További szerzők:Szentandrássy Norbert (1976-) (élettanász) Magyar János (1961-) (élettanász) Szabó Zoltán (1973-) (belgyógyász, kardiológus) Nánási Péter Pál (1956-) (élettanász) Chen-Izu, Ye Izu, Leighton T.
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4.

001-es BibID:BIBFORM041935
Első szerző:Bányász Tamás (élettanász)
Cím:Profile of L-type Ca(2+) current and Na(+)/Ca(2+) exchange current during cardiac action potential in ventricular myocytes / Tamas Banyasz, Balazs Horvath, Zhong Jian, Leighton T. Izu, Ye Chen-Izu
Dátum:2012
ISSN:1547-5271
Megjegyzések:OBJECTIVE: The L-type Ca(2+) current (I(Ca,L)) and the Na(+)/Ca(2+) exchange current (I(NCX)) are major inward currents that shape the cardiac action potential (AP). Previously, the profile of these currents during the AP was determined from voltage-clamp experiments that used Ca(2+) buffer. In this study, we aimed to obtain direct experimental measurement of these currents during cardiac AP with Ca(2+) cycling. METHOD: A newly developed AP-clamp sequential dissection method was used to record ionic currents in guinea pig ventricular myocytes under a triad of conditions: using the cell's own AP as the voltage command, using internal and external solutions that mimic the cell's ionic composition, and, importantly, not using any exogenous Ca(2+) buffer. RESULTS: The nifedipine-sensitive current (I(NIFE)), which is composed of I(Ca,L) and I(NCX), revealed hitherto unreported features during the AP with Ca(2+) cycling in the cell. We identified 2 peaks in the current profile followed by a long residual current extending beyond the AP, coinciding with a residual depolarization. The second peak and the residual current become apparent only when Ca(2+) is not buffered. Pharmacological dissection of I(NIFE) by using SEA0400 shows that I(Ca,L) is dominant during phases 1 and 2 whereas I(NCX) contributes significantly to the inward current during phases 3 and 4 of the AP. CONCLUSION: These data provide the first direct experimental visualization of I(Ca,L) and I(NCX) during cardiac the AP and Ca(2+) cycle. The residual current reported here can serve as a potential substrate for afterdepolarizations when increased under pathologic conditions.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Heart Rhythm. - 9 : 1 (2012), p. 134-142. -
További szerzők:Horváth Balázs (1981-) (élettanász) Jian, Zhong Izu, Leighton T. Chen-Izu, Ye
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5.

001-es BibID:BIBFORM020231
035-os BibID:WOS:000294414700009
Első szerző:Bányász Tamás (élettanász)
Cím:Cardiac calmodulin kinase : a potential target for drug design / Banyasz T., Szentandrassy N., Toth A., Nanasi P. P., Magyar J., Chen-Izu Y.
Dátum:2011
ISSN:0929-8673
Megjegyzések:Therapeutic strategy for cardiac arrhythmias has undergone a remarkable change during the last decades. Currently implantable cardioverter defibrillator therapy is considered to be the most effective therapeutic method to treat malignant arrhythmias. Some even argue that there is no room for antiarrhythmic drug therapy in the age of implantable cardioverter defibrillators. However, in clinical practice, antiarrhythmic drug therapies are frequently needed, because implantable cardioverter defibrillators are not effective in certain types of arrhythmias (i.e. premature ventricular beats or atrial fibrillation). Furthermore, given the staggering cost of device therapy, it is economically imperative to develop alternative effective treatments. Cardiac ion channels are the target of a number of current treatment strategies, but therapies based on ion channel blockers only resulted in moderate success. Furthermore, these drugs are associated with an increased risk of proarrhythmia, systemic toxicity, and increased defibrillation threshold. In many cases, certain ion channel blockers were found to increase mortality. Other drug classes such as beta-blockers, angiotensin-converting enzyme inhibitors, aldosterone antagonists, and statins appear to have proven efficacy for reducing cardiac mortality. These facts forced researchers to shift the focus of their research to molecular targets that act upstream of ion channels. One of these potential targets is calcium/calmodulin-dependent kinase II (CaMKII). Several lines of evidence converge to suggest that CaMKII inhibition may provide an effective treatment strategy for heart diseases. (1) Recent studies have elucidated that CaMKII plays a key role in modulating cardiac function and regulating hypertrophy development. (2) CaMKII activity has been found elevated in the failing hearts from human patients and animal models. (3) Inhibition of CaMKII activity has been shown to mitigate hypertrophy, prevent functional remodeling and reduce arrhythmogenic activity. In this review, we will discuss the structural and functional properties of CaMKII, the modes of its activation and the functional consequences of CaMKII activity on ion channels.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Current Medicinal Chemistry. - 18 : 24 (2011), p. 3707-3713. -
További szerzők:Szentandrássy Norbert (1976-) (élettanász) Tóth András (farmakológus) Nánási Péter Pál (1956-) (élettanász) Magyar János (1961-) (élettanász) Chen-Izu, Ye
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6.

001-es BibID:BIBFORM020219
035-os BibID:WOS:000287469400023
Első szerző:Bányász Tamás (élettanász)
Cím:Sequential dissection of multiple ionic currents in single cardiac myocytes under action potential-clamp / Banyasz T., Horvath B., Jian Z., Izu L. T., Chen-Izu Y.
Dátum:2011
ISSN:0022-2828
Megjegyzések:The cardiac action potential (AP) is shaped by myriad ionic currents. In this study, we develop an innovative AP-clamp Sequential Dissection technique to enable the recording of multiple ionic currents in the single cell under AP-clamp. This new technique presents a significant step beyond the traditional way of recording only one current in any one cell. The ability to measure many currents in a single cell has revealed two hitherto unknown characteristics of the ionic currents in cardiac cells: coordination of currents within a cell and large variation of currents between cells. Hence, the AP-clamp Sequential Dissection method provides a unique and powerful tool for studying individual cell electrophysiology.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal of Molecular and Cellular Cardiology 50 : 3 (2011), p. 578-581. -
További szerzők:Horváth Balázs (1981-) (élettanász) Jian, Zhong Izu, Leighton T. Chen-Izu, Ye
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7.

001-es BibID:BIBFORM004070
Első szerző:Bányász Tamás (élettanász)
Cím:Transformation of adult rat cardiac myocytes in primary culture / Bányász T., Lozinskiy I., Payne C. E., Edelmann S., Norton B., Chen B., Chen-Izu Y., Izu L.T., Balke C. W.
Dátum:2008
Megjegyzések:We characterized the morphological, electrical and mechanical alterations of cardiomyocytes in long-term cell culture. Morphometric parameters, sarcomere length, T-tubule density, cell capacitance, L-type calcium current (I(Ca,L)), inward rectifier potassium current (I(K1)), cytosolic calcium transients, action potential and contractile parameters of adult rat ventricular myocytes were determined on each day of 5 days in culture. We also analysed the health of the myocytes using an apoptotic/necrotic viability assay. The data show that myocytes undergo profound morphological and functional changes during culture. We observed a progressive reduction in the cell area (from 2502 +/- 70 microm(2) on day 0 to 1432 +/- 50 microm(2) on day 5), T-tubule density, systolic shortening (from 0.11 +/- 0.02 to 0.05 +/- 0.01 microm) and amplitude of calcium transients (from 1.54 +/- 0.19 to 0.67 +/- 0.19) over 5 days of culture. The negative force-frequency relationship, characteristic of rat myocardium, was maintained during the first 2 days but diminished thereafter. Cell capacitance (from 156 +/- 8 to 105 +/- 11 pF) and membrane currents were also reduced (I(Ca,L), from 3.98 +/- 0.39 to 2.12 +/- 0.37 pA pF; and I(K1), from 34.34p +/- 2.31 to 18.00 +/- 5.97 pA pF(-1)). We observed progressive depolarization of the resting membrane potential during culture (from 77.3 +/- 2.5 to 34.2 +/- 5.9 mV) and, consequently, action potential morphology was profoundly altered as well. The results of the viability assays indicate that these alterations could not be attributed to either apoptosis or necrosis but are rather an adaptation to the culture conditions over time.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Experimental Physiology 93 : 3 (2008), p. 370-382. -
További szerzők:Lozinskiy, Ilya Payne, Charles E. Edelmann, Stephanie Norton, Byron Chen, Biyi Chen-Izu, Ye Izu, Leighton T. Balke, C. William
Internet cím:elektronikus változat
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8.

001-es BibID:BIBFORM001017
Első szerző:Bányász Tamás (élettanász)
Cím:A new approach to the detection and statistical classification of Ca2+ sparks / Bányász T., Chen-Izu Y., Balke C. W., Izu L. T.
Dátum:2007
Megjegyzések:The availability of high-speed, two-dimensional (2-D) confocal microscopes and the expanding armamentarium of fluorescent probes presents unprecedented opportunities and new challenges for studying the spatial and temporal dynamics of cellular processes. The need to remove subjectivity from the detection process, the difficulty of the human eye to detect subtle changes in fluorescence in these 2-D images, and the large volume of data produced by these confocal microscopes call for the need to develop algorithms to automatically mark the changes in fluorescence. These fluorescence signal changes are often subtle, so the statistical estimate of the likelihood that the detected signal is not noise is an integral part of the detection algorithm. This statistical estimation is fundamental to our new approach to detection; in earlier Ca(2+) spark detectors, this statistical assessment was incidental to detection. Importantly, the use of the statistical properties of the signal local to the spark, instead of over the whole image, reduces the false positive and false negative rates. We developed an automatic spark detection algorithm based on these principles and used it to detect sparks on an inhomogeneous background of transverse tubule-labeled rat ventricular cells. Because of the large region of the cell surveyed by the confocal microscope, we can detect a large enough number of sparks to measure the dynamic changes in spark frequency in individual cells. We also found, in contrast to earlier results, that cardiac sparks are spatially symmetric. This new approach puts the detection of fluorescent signals on a firm statistical foundation.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Biophysical Journal 92 (2007), p. 4458-4465. -
További szerzők:Chen-Izu, Ye Balke, C. William Izu, Leighton T.
Internet cím:elektronikus változat
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9.

001-es BibID:BIBFORM119269
Első szerző:Chen-Izu, Ye
Cím:Innovative techniques and new insights : studying cardiac ionic currents and action potentials in physiologically relevant conditions / Ye Chen-Izu, Bence Hegyi, Zhong Jian, Balazs Horvath, John A. Shaw, Tamas Banyasz, Leighton T. Izu
Dátum:2023
Megjegyzések:Cardiac arrhythmias are associated with various forms of heart diseases. Ventricular arrhythmias present a significant risk for sudden cardiac death. Atrial fibrillations predispose to blood clots leading to stroke and heart attack. Scientists have been developing patch-clamp technology to study ion channels and action potentials (APs) underlying cardiac excitation and arrhythmias. Beyond the traditional patch-clamp techniques, innovative new techniques were developed for studying complex arrhythmia mechanisms. Here we review the recent development of methods including AP-Clamp, Dynamic Clamp, AP-Clamp Sequential Dissection, and Patch-Clamp-in-Gel. These methods provide powerful tools for researchers to decipher how the dynamic systems in excitation-Ca2+ signaling-contraction feedforward and feedback to control cardiac function and how their dysregulations lead to heart diseases
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
action potential
arrhythmia
cardiac myocyte
patch-clamp
electrophysiology
Megjelenés:Physiological Mini Reviews. - 16 : 3 (2023), p. 22-34. -
További szerzők:Hegyi Bence (1987-) (élettanász) Jian, Zhong Horváth Balázs (1981-) (élettanász) Shaw, John A. Bányász Tamás (1960-) (élettanász) Izu, Leighton T.
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10.

001-es BibID:BIBFORM073609
Első szerző:Chen-Izu, Ye
Cím:Recording of Ionic Currents Under Physiological Conditions : action Potential-Clamp and 'Onion-Peeling' Techniques / Ye Chen-Izu, Leighton T. Izu, Bence Hegyi, Tamas Banyasz
Dátum:2017
ISBN:9781493967131
Tárgyszavak:Orvostudományok Elméleti orvostudományok könyvfejezet
Megjelenés:Modern Tools of Biophysics, Handbook of Modern Biophysics / Ed. Jue, Thomas. - p. 31-48. -
További szerzők:Izu, Leighton T. Hegyi Bence (1987-) (élettanász) Bányász Tamás (1960-) (élettanász)
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11.

001-es BibID:BIBFORM073614
Első szerző:Chen-Izu, Ye
Cím:From Action Potential-Clamp to "Onion-Peeling" Technique : recording of Ionic Currents Under Physiological Conditions / Ye Chen-Izu, Leighton T. Izu, Peter P. Nanasi, Tamas Banyasz
Dátum:2012
ISBN:9789535104063
Tárgyszavak:Orvostudományok Elméleti orvostudományok könyvfejezet
Megjelenés:Patch Clamp Technique / ed. Fatima Shad Kaneez. - p. 143-162. -
További szerzők:Izu, Leighton T. Nánási Péter Pál (1956-) (élettanász) Bányász Tamás (1960-) (élettanász)
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12.

001-es BibID:BIBFORM001086
Első szerző:Chen-Izu, Ye
Cím:Hypertension-induced remodeling of cardiac excitation-contraction coupling in ventricular myocytes occurs prior to hypertrophy development / Chen-Izu Y., Chen L., Bányász T., McCulle S. L., Norton B., Scharf S. M., Agarwal A., Patwardhan A., Izu L. T., Balke C. W.
Dátum:2007
ISSN:0363-6135 (Print)
Megjegyzések:Hypertension is a major risk factor for developing cardiac hypertrophy and heart failure. Previous studies show that hypertrophied and failing hearts display alterations in excitation-contraction (E-C) coupling. However, it is unclear whether remodeling of the E-C coupling system occurs before or after heart disease development. We hypothesized that hypertension might cause changes in the E-C coupling system that, in turn, induce hypertrophy. Here we tested this hypothesis by utilizing the progressive development of hypertensive heart disease in the spontaneously hypertensive rat (SHR) to identify a window period when SHR had just developed hypertension but had not yet developed hypertrophy. We found the following major changes in cardiac E-C coupling during this window period. 1) Using echocardiography and hemodynamics measurements, we found a decrease of left ventricular ejection fraction and cardiac output after the onset of hypertension. 2) Studies in isolated ventricular myocytes showed that myocardial contraction was also enhanced at the same time. 3) The action potential became prolonged. 4) The E-C coupling gain was increased. 5) The systolic Ca(2+) transient was augmented. These data show that profound changes in E-C coupling already occur at the onset of hypertension and precede hypertrophy development. Prolonged action potential and increased E-C coupling gain synergistically increase the Ca(2+) transient. Functionally, augmented Ca(2+) transient causes enhancement of myocardial contraction that can partially compensate for the greater workload to maintain cardiac output. The increased Ca(2+) signaling cascade as a molecular mechanism linking hypertension to cardiac hypertrophy development is also discussed.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:American Journal of Physiology. Heart and Circulatory Physiology 293 (2007), p. 3301-3310. -
További szerzők:Chen, L. Bányász Tamás (1960-) (élettanász) McCulle, S. L. Norton, Byron Scharf, S. M. Agarwal, Anupam Patwardhan, A. Izu, Leighton T. Balke, C. William
Internet cím:Elektronikus változat
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