CCL

Összesen 11 találat.
#/oldal:
Részletezés:
Rendezés:

1.

001-es BibID:BIBFORM049405
Első szerző:Altafaj, Xavier
Cím:The scorpion toxin maurocalcine; a tool to study the excitation-contraction coupling in skeletal muscle / X. Altafaj, K. Mabrouk, I. Jona, L. Csernoch, M. De Waard, M. Ronjat
Dátum:2004
Megjegyzések:Maurocalcine (MCa) ? isolated from the venom of the Scorpio Maurus Palmatus has been described as an extremely potent modulator of the sarcoplasmic reticulum calcium release channel (CRC/RyR). Using single channel bilayer electrophysiology and confocal laser scanning microscopy we have shown that MCa is capable of altering the open probability and the gating characteristics of CRC/RyR by inducing long lasting subconductance states (LLSS). LLSS can last for several seconds. In parallel MCa induces complex event of calcium release in line-scan images. Using mutants of MCa we have demonstrated that the surface charge and/or charge distribution is the most important single parameter of the MCa effect. Altering even a single amino acid which destroys the positively charged area overwhelmingly influences the effect of the toxin on CRC/RyR. The effectiveness of the mutants is roughly proportionally with the real distance from the critical 24 residue. Their effects on the isolated channel and on the calcium release events were between those of the wild type and the ineffective Arg24Ala mutant.
Tárgyszavak:Természettudományok Biológiai tudományok idézhető absztrakt
calcium release
Megjelenés:Journal of Muscle Research and Cell Motility. - 26 (2004), p. 59. -
További szerzők:Mabrouk, Kamel Jóna István (1948-) (élettanász, fizikus) Csernoch László (1961-) (élettanász) De Waard, Michel Ronjat, Michel
Internet cím:Szerző által megadott URL
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

2.

001-es BibID:BIBFORM049809
Első szerző:Csernoch László (élettanász)
Cím:Elementary calcium release events (ECRE) in the presence of the scorpion toxin maurocalcine / L. Csernoch, H. Szappanos, J. Cseri, M. Gönczi, J. Sabatier, X. Altafaj, M. DeWaard, M. Ronjat
Dátum:2004
Tárgyszavak:Orvostudományok Elméleti orvostudományok idézhető absztrakt
Megjelenés:Biophysical Journal. - 86 (2004), p. 579a. -
További szerzők:Szappanos Henrietta (1976-) (biológus, élettanász) Cseri Julianna (1949-2022) (laboratóriumi diagnosztika szakorvos) Gönczi Mónika (1974-) (élettanász) Sabatier, Jean Marc Altafaj, Xavier DeWaard, M. Ronjat, Michel
Borító:

3.

001-es BibID:BIBFORM049404
Első szerző:Csernoch László (élettanász)
Cím:Surface charge distribution commands the maurocacline effect on the ryanodine receptor / L. Csernoch, M. Ronjat, J. M. Sabatier, Cs. Szegedi, I. Jóna
Dátum:2004
Megjegyzések:Maurocalcine (MCa) ? isolated from the venom of the Scorpio Maurus Palmatus ? has been described as an extremely potent modulator of the sarcoplasmic reticulum calcium release channel (CRC/RyR). Using single channel bilayer electrophysiology and confocal laser scanning microscopy we have shown that MCa is capable of altering the open probability and the gating characteristics of CRC/RyR by inducing long lasting subconductance states (LLSS). LLSS can last for several seconds. In parallel MCa induces complex event of calcium release in line-scan images. Using mutants of MCa we have demonstrated that the surface charge and/or charge distribution is the most important single parameter of the MCa effect. Altering even a single amino acid which destroys the positively charged area overwhelmingly influences the effect of the toxin on CRC/RyR. The effectiveness of the mutants is roughly proportionally with the real distance from the critical 24 residue. Their effects on the isolated channel and on the calcium release events were between those of the wild type and the ineffective Arg24Ala mutant.
Tárgyszavak:Természettudományok Biológiai tudományok idézhető absztrakt
calcium release
Megjelenés:Journal of Muscle Research and Cell Motility. - 25 (2004), p. 257. -
További szerzők:Ronjat, Michel Sabatier, Jean Marc Szegedi Csaba Jóna István (1948-) (élettanász, fizikus)
Internet cím:Szerző által megadott URL
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

4.

001-es BibID:BIBFORM004121
Első szerző:Csernoch László (élettanász)
Cím:Voltage-activated elementary calcium release events in isolated mouse skeletal muscle fibers / Laszlo Csernoch, Sandrine Pouvreau, Michel Ronjat, Vincent Jacquemond
Dátum:2008
Megjegyzések:The elementary Ca(2+)-release events underlying voltage-activated myoplasmic Ca(2+) transients in mammalian muscle remain elusive. Here, we looked for such events in confocal line-scan (x,t) images of fluo-3 fluorescence taken from isolated adult mouse skeletal muscle fibers held under voltage-clamp conditions. In response to step depolarizations, spatially segregated fluorescence signals could be detected that were riding on a global increase in fluorescence. These discrete signals were separated using digital filtering in the spatial domain; mean values for their spatial half-width and amplitude were 1.99 +/- 0.09 microm and 0.16 +/- 0.005 DeltaF/F(0) (n = 151), respectively. Under control conditions, the duration of the events was limited by the pulse duration. In contrast, in the presence of maurocalcine, a scorpion toxin suspected to disrupt the process of repolarization-induced ryanodine receptor (RyR) closure, events uninterrupted by the end of the pulse were readily detected. Overall results establish these voltage-activated low-amplitude local Ca(2+) signals as inherent components of the physiological Ca(2+)-release process of mammalian muscle and suggest that they result from the opening of either one RyR or a coherently operating group of RyRs, under the control of the plasma membrane polarization.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:The Journal of Membrane Biology. - 226 : (1-3) (2008), p. 43-55. -
További szerzők:Pouvreau, Sandrine Ronjat, Michel Jacquemond, Vincent
Internet cím:elektronikus változat
DOI
Borító:

5.

001-es BibID:BIBFORM004115
Első szerző:Lukács Balázs (élettanász)
Cím:Charged surface area of maurocalcine determines its interaction with the skeletal ryanodine receptor / Balazs Lukacs, Monika Sztretye, Janos Almassy, Sandor Sarkozi, Beatrix Dienes, Kamel Mabrouk, Cecilia Simut, Laszlo Szabo, Peter Szentesi, Michel De Waard, Michel Ronjat, Istvan Jona, Laszlo Csernoch
Dátum:2008
Megjegyzések:The 33 amino acid scorpion toxin maurocalcine (MCa) has been shown to modify the gating of the skeletal-type ryanodine receptor (RyR1). Here we explored the effects of MCa and its mutants ([Ala(8)]MCa, [Ala(19)]MCa, [Ala(20)]MCa, [Ala(22)]MCa, [Ala(23)]MCa, and [Ala(24)]MCa) on RyR1 incorporated into artificial lipid bilayers and on elementary calcium release events (ECRE) in rat and frog skeletal muscle fibers. The peptides induced long-lasting subconductance states (LLSS) on RyR1 that lasted for several seconds. However, their average length and frequency were decreased if the mutation was placed farther away in the 3D structure from the critical (24)Arg residue. The effect was strongly dependent on the direction of the current through the channel. If the direction was similar to that followed by calcium during release, the peptides were 8- to 10-fold less effective. In fibers long-lasting calcium release events were observed after the addition of the peptides. The average length of these events correlated well with the duration of LLSS. These data suggest that the effect of the peptide is governed by the large charged surface formed by residues Lys(20), Lys(22), Arg(23), Arg(24), and Lys(8). Our observations also indicate that the results from bilayer experiments mimic the in situ effects of MCa on RyR1.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Biophysical Journal. - 95 : 7 (2008), p. 3497-3509. -
További szerzők:Sztretye Mónika (1981-) (élettanász, elektrofiziológus) Almássy János (1981-) (élettanász, biológus, angol-magyar szakfordító) Sárközi Sándor (1966-) (élettanász) Dienes Beatrix (1972-) (élettanász, molekuláris biológus) Mabrouk, Kamel Simut, Cecilia Szabó László (Románia) Szentesi Péter (1967-) (élettanász) De Waard, Michel Ronjat, Michel Jóna István (1948-) (élettanász, fizikus) Csernoch László (1961-) (élettanász)
Internet cím:elektronikus változat
elektronikus változat
DOI
Borító:

6.

001-es BibID:BIBFORM050282
Első szerző:Pouvreau, Sandrine
Cím:Nitric oxide and peptide modulation of excitation-contraction coupling in isolated mammalian skeletal muscle fibres / S. Pouvreau, L. Csernoch, B. Allard, M. Ronjat, V. Jacquemond
Dátum:2006
Tárgyszavak:Orvostudományok Elméleti orvostudományok idézhető absztrakt
Megjelenés:Journal of Muscle Research and Cell Motility. - 27 (2006), p. 513. -
További szerzők:Csernoch László (1961-) (élettanász) Allard, Bruno Ronjat, Michel Jacquemond, Vincent
Borító:

7.

001-es BibID:BIBFORM049814
Első szerző:Pouvreau, Sandrine
Cím:Transient loss of voltage control of Ca2+ release in the presence of Maurocalcine in mouse skeletal muscle / S. Pouvreau, L. Csernoch, B. Allard, J. M. Sabatier, M. de Waard, M. Ronjat, V. Jacquemond
Dátum:2006
Tárgyszavak:Orvostudományok Elméleti orvostudományok idézhető absztrakt
Megjelenés:Biophysical Journal. - 90 (2006), p. 1280a. -
További szerzők:Csernoch László (1961-) (élettanász) Allard, Bruno Sabatier, Jean Marc DeWaard, M. Ronjat, Michel Jacquemond, Vincent
Borító:

8.

001-es BibID:BIBFORM020027
Első szerző:Pouvreau, Sandrine
Cím:Transient loss of voltage control of Ca2+ release in the presence of maurocalcine in skeletal muscle / Sandrine Pouvreau, Laszlo Csernoch, Bruno Allard, Jean Marc Sabatier, Michel De Waard, Michel Ronjat, Vincent Jacquemond
Dátum:2006
ISSN:0006-3495
Megjegyzések:In skeletal muscle, sarcoplasmic reticulum (SR) calcium release is controlled by the plasma membrane voltage through interactions between the voltage-sensing dihydropyridine receptor (DHPr) and the ryanodine receptor (RYr) calcium release channel. Maurocalcine (MCa), a scorpion toxin peptide presenting some homology with a segment of a cytoplasmic loop of the DHPr, has been previously shown to strongly affect the activity of the isolated RYr. We injected MCa into mouse skeletal muscle fibers and measured intracellular calcium under voltage-clamp conditions. Voltage-activated calcium transients exhibited similar properties in control and in MCa-injected fibers during the depolarizing pulses, and the voltage dependence of calcium release was similar under the two conditions. However, MCa was responsible for a pronounced sustained phase of Ca2+ elevation that proceeded for seconds following membrane repolarization, with no concurrent alteration of the membrane current. The magnitude of the underlying uncontrolled extra phase of Ca2+ release correlated well with the peak calcium release during the pulse. Results suggest that MCa binds to RYr that open on membrane depolarization and that this interaction specifically alters the process of repolarization-induced closure of the channels.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Biophysical Journal. - 91 : 6 (2006), p. 2206-2215. -
További szerzők:Csernoch László (1961-) (élettanász) Allard, Bruno Sabatier, Jean Marc De Waard, Michel Ronjat, Michel Jacquemond, Vincent
Internet cím:DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

9.

001-es BibID:BIBFORM004142
Első szerző:Szappanos Henrietta (biológus, élettanász)
Cím:Differential effects of maurocalcine on Ca2+ release events and depolarisation-induced Ca2+ release in rat skeletal muscle / Szappanos H., Smida-Resgui S., Cseri J., Simut C., Sabatier J.M., De Waard M., Kovacs L., Csernoch L., Ronjat M.
Dátum:2005
Megjegyzések:Maurocalcine (MCa), a 33 amino acid toxin obtained from scorpion venom, has been shown to interact with the isolated skeletal-type ryanodine receptor (RyR1) and to strongly modify its calcium channel gating. In this study, we explored the effects of MCa on RyR1 in situ to establish whether the functional interaction of RyR1 with the voltage-sensing dihydropyridine receptor (DHPR) would modify the ability of MCa to interact with RyR1. In developing skeletal muscle cells the addition of MCa into the external medium induced a calcium transient resulting from RyR1 activation and strongly inhibited the effect of the RyR1 agonist chloro-m-cresol. In contrast, MCa failed to affect the depolarization-induced Ca2+ release. In intact adult fibres MCa did not induce any change in the cytosolic Ca2+ concentration. However, when the surface membrane was permeabilized and calcium release events were readily observable, MCa had a time-dependent dual effect: it first increased event frequency, from 0.060 ? 0.002 to 0.150 ? 0.007 sarcomere?1 s?1, and reduced the amplitude of individual events without modifying their spatial distribution. Later on it induced the appearance of long-lasting events resembling the embers observed in control conditions but having a substantially longer duration. We propose that the functional coupling of DHPRs and RyR1s within a Ca2+ release unit prevents MCa from either reaching its binding site or from being able to modify the gating not only of the RyR1s physically coupled to DHPRs but all RyR1s within the Ca2+ release unit.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:The Journal of Physiology (London). - 565 : (Pt3) (2005), p. 843-853. -
További szerzők:Smida-Resgui, Sophia Cseri Julianna (1949-2022) (laboratóriumi diagnosztika szakorvos) Simut, Cecilia Sabatier, Jean Marc De Waard, Michel Kovács László (1939-) (élettanász) Csernoch László (1961-) (élettanász) Ronjat, Michel
Internet cím:elektronikus változat
DOI
elektronikus változat
Borító:

10.

001-es BibID:BIBFORM049411
Első szerző:Szentesi Péter (élettanász)
Cím:Mutations in the scorpion toxin maurocalcine alter its ability to modify the calcium release events in frog skeletal muscle / P. Szentesi, J. Almássy, M. Fehér, B. Dienes, C. A. Simut, I. Jona, M. Ronjat, L. Csernoch
Dátum:2006
Megjegyzések:Maurocalcine (MCa), a 33 amino acid toxin obtained from the venom of Scorpio Maurus Palmatus, has been shown to interact with the isolated skeletal-type ryanodine receptor (RyR1) and to strongly modify its calcium channel gating. In this study, we explored the effects of MCa and its mutants (Lys8Ala, Lys19Ala and Lys22Ala) on elementary calcium release events in frog skeletal muscle fibers.Fibers were mechanically dissected, chemically skinned with saponin and imaged by a laser scanning confocal microscope in line scan mode in the presence of MCa and its mutants.Long lasting spontaneous calcium release events (embers), were observed after the addition of the toxins which were never seen under control conditions. Two typical forms of embers: with or without a classical spark were identified. The length of the embers correlated well with the duration of the long lasting sub-conductance states seen on MCa-modified RyR1-s incorporated into planar lipid bilayers. In particular, the Lys8Ala and Lys19Ala mutants had similar effects as the wild type MCa and produced long (430.9 ? 42.9, 442.6 ? 19.4 ms), while the Lys22Ala mutant induced shorter (65.3 ? 7.5 ms) events. Our observations indicate that the results from artificial lipid bilayer experiments mimic the in situ effects of MCa on RyR. We propose that an ember reflects the calcium release from a single release unit modified by the toxin.
Tárgyszavak:Természettudományok Biológiai tudományok idézhető absztrakt
calcium release
Megjelenés:Journal of Muscle Research and Cell Motility. - 27 (2006), p. 516. -
További szerzők:Almássy János (1981-) (élettanász, biológus, angol-magyar szakfordító) Fehér Miklós Dienes Beatrix (1972-) (élettanász, molekuláris biológus) Simut, Cecilia Jóna István (1948-) (élettanász, fizikus) Ronjat, Michel Csernoch László (1961-) (élettanász)
Internet cím:Szerző által megadott URL
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

11.

001-es BibID:BIBFORM024561
Első szerző:Treves, Susan
Cím:SRP-35 a newly identified protein of the skeletal muscle sarcoplasmic reticulum is a retinol dehydrogenase / Susan Treves, Raphael Thurnheer, Barbara Mosca, Mirko Vukcevic, Leda Bergamelli, Rebecca Voltan, Vitus Oberhauser, Michel Ronjat, Laszlo Csernoch, Peter Szentesi, Francesco Zorzato
Dátum:2012
ISSN:0264-6021
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Biochemical Journal. - 441 : 2 (2012), p. 731-741. -
További szerzők:Thurnheer, Raphael Mosca, Barbara Vukcevic, Mirko Bergamelli, Leda Voltan, Rebecca Oberhauser, Vitus Ronjat, Michel Csernoch László (1961-) (élettanász) Szentesi Péter (1967-) (élettanász) Zorzato, Francesco
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Rekordok letöltése1 
Corvina könyvtári katalógus v8.2.27 © 2023 Monguz kft. Minden jog fenntartva.