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1.

001-es BibID:BIBFORM046293
Első szerző:Gáspár Rezső (biofizikus)
Cím:Effect of acetylcholine on the electrophysiology and proliferative response of human lymphocytes / Gaspar R., Varga Z., Bene L., Marcheselli F., Pieri C., Damjanovich S.
Dátum:1996
ISSN:0006-291X
Megjegyzések:Using the patch-clamp technique, we determined that 1-15 mM extracellular acetylcholine reduced whole-cell n-type K+ currents in human peripheral blood lymphocytes and accelerated their inactivation. The percentage increase in K+ channel inactivation rate and the degree of drug induced block were independent of membrane potential. In flow cytometric membrane potential measurements with the oxonol dye similar doses of acetylcholine depolarized the lymphocyte population. Both acetylcholine induced K+ channel block and depolarization fully developed within 2 minutes. The depolarizing and K+ channel blocking effects of acetylcholine are in concert. [3H]thymidine incorporation experiments proved that the proliferative response of PHA stimulated peripheral blood lymphocytes was decreased by increasing concentrations of acetylcholine in the 1-50 mM range.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Biochemical And Biophysical Research Communications. - 226 : 2 (1996), p. 303-308. -
További szerzők:Varga Zoltán (1969-) (biofizikus, szakfordító) Bene László (1963-) (biofizikus) Marcheselli, Fiorella Pieri, Carlo Damjanovich Sándor (1936-2017) (biofizikus)
Pályázati támogatás:T14655
OTKA
T13335
OTKA
6221
OTKA
Internet cím:Szerző által megadott URL
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
Intézményi repozitóriumban (DEA) tárolt változa
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3.

001-es BibID:BIBFORM004637
Első szerző:Recchioni, Rina
Cím:Melatonin increases the intensity of respiratory burst and prevents L-selectin shedding in human neutrophils in vitro / Recchioni, R., Marcheselli, F., Moroni, F., Gaspar, R., Damjanovich, S., Pieri, C.
Dátum:1998
ISSN:006-291X
Megjegyzések:Effects of melatonin priming of neutrophils and subsequent increase of phorbol 12-miristate 13-acetate stimulated respiratory burst were investigated on the modulation of L-selectin shedding and MAC-1 upregulation. Respiratory burst related H2O2 production and adhesion molecule expression were quantified by flow cytometry. Phorbol 12-miristate 13-acetate dose dependence of intracellular oxidation and adhesion molecule expression showed no relationship between respiratory burst intensity and MAC-1 expression or L-selectin shedding. Treatment of cells with 12.5 nM phorbol 12-miristate 13-acetate resulted in less than 20% of the respiratory burst response, however it induced 91.7% of total MAC-1 expression and 62.8% of L-selectin shedding. Melatonin priming experiments showed also no connection between the extent of respiratory burst and MAC-1 expression, however melatonin priming almost completely prevented L-selectin down-regulation elicited by phorbol 12-miristate 13-acetate, without affecting MAC-1 expression. It is suggested that melatonin may inhibit metalloproteases responsible for L-selectin cleavage
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
biosynthesis
blood
Dose-Response Relationship,Drug
drug effects
Flow Cytometry
Human
Hydrogen Peroxide
In Vitro
Kinetics
L-Selectin
Macrophage-1 Antigen
Melatonin
Neutrophils
pharmacology
physiology
Research
Respiratory Burst
Rhodamine 123
Support, Non-U.S.Gov't
Tetradecanoylphorbol Acetate
Megjelenés:Biochemical and Biophysical Research Communications. - 252 : 1 (1998), p. 20-24. -
További szerzők:Marcheselli, Fiorella Moroni, Fausto Gáspár Rezső (1944-) (biofizikus) Damjanovich Sándor (1936-2017) (biofizikus) Pieri, Carlo
Internet cím:elektronikus változat
elektronikus változat
Borító:
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