Találati lista | Tudóstér

001-es BibID:	BIBFORM005965
Első szerző:	Balázs Margit (sejtbiológus, molekuláris genetikus)
Cím:	Accessibility of cell surface thiols in human lymphocytes is altered by ionophores or OKT-3 antibody / Margit Balázs, János Matkó, János Szöllösi, László Mátyus, Mack J. Fulwyler, Sándor Damjanovich
Dátum:	1986
Megjegyzések:	The accessibility of cell surface sulfhydryl groups in human peripheral lymphocytes was investigated with 5,5'-dithiobis-(2-nitrobenzoic acid) in the presence and absence of ionophore antibiotics and the monoclonal antibody, OKT-3. Only a few accessible protein thiols have been found on the cells as demonstrated by labeling with a fluorescent non-penetrating thiol-marker, monobromotrimethyl-ammoniobimane and the subsequent gel electrophoretic analysis of the protein pattern. Difference spectrophotometric measurement of thiol-DTNB reaction revealed that ionophores altering the transmembrane potential induced an enhanced cell surface thiol-exposure on the minute time scale. The effect showed a dependence on the external concentration of the cations. The binding of monoclonal antibody, OKT-3, directed against T3 complexes, resulted in a similar, concentration-dependent increase of thiol-accessibility. These data are interpreted as early membrane-effects of ionophores and the specific antibody including changes in the conformational equilibrium or vertical displacements of certain membrane proteins. These events are likely to be coupled to the changes in the transmembrane potential of the lymphocytes.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Ammonium Compounds analysis Antibiotics Antibodies,Monoclonal blood Cell Membrane Dithionitrobenzoic Acid drug effects Electrophoresis,Polyacrylamide Gel Human Ionophores Lymphocytes Membrane Proteins metabolism pharmacology Spectrometry,Fluorescence Sulfhydryl Compounds Support,Non-U.S.Gov't Support,U.S.Gov't,P.H.S.
Megjelenés:	Biochemical and Biophysical Research Communications. - 140 : 3 (1986), p. 999-1006. -
További szerzők:	Matkó János (1952-) (biológus) Szöllősi János (1953-) (biofizikus) Mátyus László (1956-) (biofizikus) Fulwyler, Mack J. Damjanovich Sándor (1936-2017) (biofizikus)
Internet cím:	elektronikus változat Intézményi repozitóriumban (DEA) tárolt változa DOI
Borító:
Saját polcon:

001-es BibID:	BIBFORM006015
Első szerző:	Szöllősi János (biofizikus)
Cím:	Flow cytometric measurements of fluorescence energy transfer using single laser excitation / Szöllösi, J., Mátyus, L., Trón, L., Balázs, M., Ember, I., Fulwyler, M. J., Damjanovich, S.
Dátum:	1987
Megjegyzések:	Flow cytometric energy transfer (FCET) measurements between labeled specific sites of cell surface elements (Szollosi et al., Cytometry, 5:210-216, 1984) have been extended in a simplified form using a flow cytometer equipped with single excitation beam. This versatile and easily applicable method has several advantages over any nonflow cytometric (i.e., spectrofluorimetric) energy transfer measurements on cell surfaces: The labeled ligands can be applied in excess, without washing, thereby enabling the investigation of relatively labile receptor-ligand complexes. Contributions of signals from cell debris, from cell aggregates, or from nonviable cells can be avoided by gating the data collection on the light scatter signal. The heterogeneity of the cell population with respect to the proximity of the labeled binding sites can be studied. In the cases of homologous ligands or of ligands binding to the same molecule but at different epitopes, the determination of fluorescence resonance energy transfer efficiency values can be carried out on a cell-by-cell basis, offering data on intramolecular conformational changes. This modified FCET method enabled us to demonstrate the uniform density of glycoproteins, specific for Con A binding, in the plasma membrane of normal and Gross virus leukemic mouse cells of different sizes. The utility of this procedure has also been demonstrated by using the mean fluorescence intensities of the distribution curves in the calculation of the fluorescence energy transfer efficiency.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk analysis Antigens,Surface Binding Sites diagnostic use Energy Transfer Epitopes Flow Cytometry Fluorescein Fluoresceins Fluorescence Glycoproteins instrumentation Lasers Ligands Light Lymphocytes Lymphoma Receptors,Concanavalin A Rhodamines Spectrometry,Fluorescence Support,U.S.Gov't,Non-P.H.S.
Megjelenés:	Cytometry. - 8 : 2 (1987), p. 120-128. -
További szerzők:	Mátyus László (1956-) (biofizikus) Trón Lajos (1941-) (biofizikus) Balázs Margit (1952-) (sejtbiológus, molekuláris genetikus) Ember István Fulwyler, Mack J. Damjanovich Sándor (1936-2017) (biofizikus)
Internet cím:	elektronikus változat Intézményi repozitóriumban (DEA) tárolt változa
Borító:
Saját polcon: