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001-es BibID:BIBFORM006046
Első szerző:Mátyus László (biofizikus)
Cím:Voltage gating of Ca2(+)-activated potassium channels in human lymphocytes / Matyus, L., Pieri, C., Recchioni, R., Moroni, F., Bene, L., Tron, L., Damjanovich, S.
Dátum:1990
Megjegyzések:The effect of membrane potential on Ca2+ activated K+ channels was studied on human peripheral lymphocytes. Membrane potential was monitored using bisoxonol and flow cytometry. 1 mM Ca2+ in the presence of 2 microM ionomycin depolarized the control cell population, while 100 microM Ca2+ caused hyperpolarization. However 1 mM Ca2+ had a hyperpolarizing effect on previously partially depolarized cells. Potassium channel blockers did not influence the depolarization, while they inhibited the hyperpolarization. Based on the experimental evidence a voltage gating of Ca2+ activated K+ channels is suggested.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Biophysics
Calcium
drug effects
Flow Cytometry
Human
Hungary
In Vitro
Ion Channel Gating
Ionomycin
Leukocytes,Mononuclear
Lymphocytes
Membrane Potentials
pharmacology
physiology
Potassium
Potassium Channel Blockers
Potassium Channels
Support,Non-U.S.Gov't
Megjelenés:Biochemical and Biophysical Research Communications. - 171 : 1 (1990), p. 325-329. -
További szerzők:Pieri, Carlo Recchioni, Rina Moroni, Fausto Bene László (1963-) (biofizikus) Trón Lajos (1941-) (biofizikus) Damjanovich Sándor (1936-2017) (biofizikus)
Internet cím:elektronikus változat
DOI
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2.

001-es BibID:BIBFORM006052
Első szerző:Pieri, Carlo
Cím:A sodium channel opener inhibits stimulation of human peripheral blood mononuclear cells / Pieri, C., Recchioni, R., Moroni, F., Marcheselli, F., Falasca, M., Krasznai, Z., Gaspar, R., Matyus, L., Damjanovich, S.
Dátum:1992
Megjegyzések:The role of membrane potential changes in T cell activation was studied on human peripheral blood lymphocytes stimulated with phytohemagglutinin. Addition of bretylium tosylate, a sodium channels opener, to PHA treated lymphocytes modified the membrane potential and consequently blocked cell activation in a dose-dependent fashion. BT was non-toxic even in long-term (72 hr) incubations. It was reversibly removable, and the removal restored the stimulatory effect of PHA. 3H-thymidine incorporation was blocked if BT was present during the first 20-24 hr of the mitogenic activation. The later BT was added after PHA, the less inhibition of proliferation was observed. BT hyperpolarized the lymphocytes also in the presence of PHA. BT hindered the depolarizing effect of high extracellular potassium concns. The sustained polarized state of the lymphocytes did not influence the intracellular calcium increase upon PHA treatment. IL-2 and transferrin receptor expression was not hindered by BT during PHA stimulation of lymphocytes. Addition of rIL-2 did not abolish the inhibitory effect of BT. According to cell-cycle analysis BT arrested the majority of the cells in G1 phase. It is suggested that cell activation demands the flexible maintenance of a relatively narrow membrane potential "window". Any sustained and significant hyper-, or depolarization, may dramatically decrease the effectivity of transmembrane signalling.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
analysis
blood
Bretylium Tosylate
Calcium
Cell Cycle
cytology
Dose-Response Relationship,Drug
drug effects
Flow Cytometry
Human
In Vitro
Interleukin-2
Lymphocyte Transformation
Lymphocytes
Membrane Potentials
pharmacology
physiology
Phytohemagglutinins
Potassium
Receptors,Transferrin
Research
Sodium
Sodium Channels
Support,Non-U.S.Gov't
T-Lymphocytes
Megjelenés:Molecular Immunology. - 29 : 4 (1992), p. 517-524. -
További szerzők:Recchioni, Rina Moroni, Fausto Marcheselli, Fiorella Falasca, Marco Krasznai Zoltán (1950-) (biofizikus) Gáspár Rezső (1944-) (biofizikus) Mátyus László (1956-) (biofizikus) Damjanovich Sándor (1936-2017) (biofizikus)
Internet cím:elektronikus változat
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