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001-es BibID:BIBFORM049406
Első szerző:Lukács Balázs (élettanász)
Cím:Effects of natural derivatives of phenol on calcium transport of sarcoplasmic reticulum / B. Lukacs, G. Nagy, N. Dobrosi, I. Gherasim, I. Jona
Dátum:2005
Megjegyzések:The effect of natural derivatives of phenol was investigated on sarcoplasmic reticulum calcium pump (SERCA) isolated from rabbit and calcium release channel (RyR1) isolated from normal and malignant hyperthermia susceptible pig (MHS) skeletal muscle. SERCA activity was determined using ♭coupled enzyme method', the decrease of NADH concentration was followed photometrically. The effects of some of these agents on the calcium release and on the 3H ryanodine binding were investigated too. Thymol and trans-anethole inhibited the Ca2+ATPase with a Kd of 224?10 lM and 168?10 lM, respectively. The vanillin, orthovanillin, 4-methyl-2-nitrophenol, meta-anisaldehyde and cineole exerted only unspecific inhibition. In calcium release measurements, the thymol and the carvacrol activated the channel with a Kd of 158?16 lM and 211?55 lM, respectively. In binding assay experiments the thymol activated both the MHS and wild type RyR1. The MHS type RyR1 showed lower Kd to ryanodine and could bind more ryanodine than the normal type RyR1both in control and in the presence of thymol.
Tárgyszavak:Természettudományok Biológiai tudományok idézhető absztrakt
calcium release
Megjelenés:Journal of Muscle Research and Cell Motility. - 26 (2005), p. 61. -
További szerzők:Nagy G. Dobrosi Nóra (1981-) (molekuláris biológus) Gherasim, Iuliana Jóna István (1948-) (élettanász, fizikus)
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2.

001-es BibID:BIBFORM001050
Első szerző:Sárközi Sándor (élettanász)
Cím:Effect of natural phenol derivatives on skeletal type sarcoplasmic reticulum Ca2+ -ATPase and ryanodine receptor / Sárközi S., Almássy J., Lukács B., Dobrosi N., Nagy G., Jóna I.
Dátum:2007
Megjegyzések:The effect of natural phenol derivatives was studied on skeletal type sarcoplasmic reticulum Ca2+-ATPase and ryanodine receptor. The majority of the tested derivatives exerted inhibitory effect on the Ca2+-ATPase with an ascending sequence in regard to their effectiveness (IC50): cineole (3.33 mM) < ortho-vanillin (IC50 =1.13 mM) < 4-methyl-2-nitrophenol (1104 mu M) < vanillin (525 mu M) < thymol (224 mu M) < carvacrol (162 mu M). In two cases biphasic characteristic was observed: trans-anethole and meta-anisaldehyde first caused activation followed by inhibition (with IC50-s of 141 and 1903 mu M respectively) as their concentration was increased. In some cases (cineole, ortho-vanillin, meta-anisaldehyde) total inhibition of Ca2+-ATPase could not be reached as the result of the limited solubility of these drugs. Para-anisaldehyde and 6-amino-meta-cresol did not show any effect up to 3 mM. In Ca2+ release experiments drugs were applied on heavy sarcoplasmic reticulum vesicles isolated from skeletal muscle and actively loaded with calcium. Only thymol and carvacrol were able to evoke Ca2+ release with EC50 values of 158 +/- 16 and 211 +/- 55 mu M respectively. Futhermore the effect of thymol and carvacrol was tested on the isolated ryanodine receptor incorporated into artificial lipid bilayer. Both drugs activated the RyR when applied in concentrations identical to their EC50 values. These observations show that small differences in the structure of phenol derivatives sometimes have little impact on their effect on the sarcoplasmic reticulum Ca2+-ATPase or ryanodine receptor (thymol and carvacrol) whereas in certain cases they can completely abolish a particular effect (para- and meta-anysaldehide).
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
egyetemen (Magyarországon) készült közlemény
Megjelenés:Journal of Muscle Research and Cell Motility 28 (2007), p. 167-174. -
További szerzők:Almássy János (1981-) (élettanász, biológus, angol-magyar szakfordító) Lukács Balázs (1978-) (élettanász) Dobrosi Nóra (1981-) (molekuláris biológus) Nagy Georgina (1980-) (orvosbiológus) Jóna István (1948-) (élettanász, fizikus)
Internet cím:elektronikus változat
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