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1.

001-es BibID:BIBFORM004939
Első szerző:Bene László (biofizikus)
Cím:Major histocompatibility complex class I protein conformation altered by transmembrane potential changes / Bene, L., Szollosi, J., Balazs, M., Matyus, L., Gaspar, R., Ameloot, M., Dale, R. E., Damjanovich, S.
Dátum:1997
ISSN:0196-4763
Megjegyzések:The nature of charge distributions in membrane-bound macromolecular structures renders them susceptible to interaction with transmembrane potential fields. As a result, conformational changes in such species may be expected to occur when this potential is altered. We have detected reversible conformational change in the major histocompatibility complex (MHC) class I antigen in the plasma membrane of human JY cells, as monitored by flow-cytometric resonance energy-transfer, upon reduction of the transmembrane potential (depolarization). This change increased the intramolecular energy-transfer efficiency between fluorescent donor- and acceptor-labeled monoclonal antibodies directed, respectively, to epitopes on the light (beta 2-microglobulin) and the heavy chains of the MHC class I antigen. Repolarization of the depolarized samples restored the energy-transfer efficiency to the original values measured before depolarization. Depolarization caused similar relative changes in fluorescence resonance energy-transfer efficiency when Fab fragments were used for labeling MHC class I complex, suggesting that the observed phenomenon is not restricted to whole monoclonal antibodies.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Antibodies, Monoclonal
Antigen Presentation
B-Lymphocytes
beta 2-Microglobulin
Cell Membrane
chemistry
cytology
Dyes
Energy Transfer
Enzyme Activation
Flow Cytometry
Fluorescein-5-isothiocyanate
Fluorescence
Fluorescent Dyes
Histocompatibility Antigens Class I
Human
Hungary
immunology
Light
Major Histocompatibility Complex
Membrane Potentials
metabolism
methods
Na(+)-K(+)-Exchanging ATPase
Patch-Clamp Techniques
physiology
Protein Conformation
Rhodamines
Surface Properties
Megjelenés:Cytometry. - 27 : 4 (1997), p. 353-357. -
További szerzők:Szöllősi János (1953-) (biofizikus) Balázs Margit (1952-) (sejtbiológus, molekuláris genetikus) Mátyus László (1956-) (biofizikus) Gáspár Rezső (1944-) (biofizikus) Ameloot, Marcel Dale, Robert E. Damjanovich Sándor (1936-2017) (biofizikus)
Internet cím:elektronikus változat
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2.

001-es BibID:BIBFORM004628
035-os BibID:(scopus)0032190410 (wos)000076205700017
Első szerző:Damjanovich Sándor (biofizikus)
Cím:Supramolecular receptor structures in the plasma membrane of lymphocytes revealed by flow cytometric energy transfer, scanning force- and transmission electron-microscopic analyses / Damjanovich, S., Matko, J., Matyus, L., Szabo, G. jr., Szollosi, J., Pieri, J. C., Farkas, T., Gaspar, R.
Dátum:1998
ISSN:196-4763
Megjegyzések:Receptors in the plasma membrane of blood cells in general and in that of lymphocytes in particular are supposed to move around in a random walk fashion relatively freely driven by thermal diffusion, as described by the Singer-Nicolson fluid mosaic membrane model. In this article we summarized data and techniques that indicated nonrandom codistribution patterns of receptor superstructures under conditions, where the generation of such molecular colocalizations by the methods themselves were excluded. Application of fluorescence energy transfer in a flow cytometer helped to analyze such codistribution patterns in cell populations. After normalizing energy transfer values for possible differences between labeling ratios of the targeting monoclonal antibodies and using the mean values of energy transfer distribution curves, two-dimensional receptor maps were generated from data obtained in a pair-wise fashion between receptors. Major histocompatibility complex (MHC) class I and II, intercellular adhesion molecule-1 (ICAM-1), TcR-CD3-CD4, tetraspan molecules (CD81, CD82, CD53), and the subunits of the multisubunit IL-2 receptor displayed nonrandom codistribution patterns sometimes with, but very frequently without induction by their ligand. Immunogold-bead "sandwich" labeling analyzed by atomic force microscopy has shown that such receptor "islands" existed also in "receptor-island-groups". This indicated the existence of nonrandom receptor distribution of MHC class I and II molecules also at an elevated hierarchical level. An analysis is given herein concerning a standardized approach. The apparent incompatibility of these supramolecular patterns with the Singer-Nicolson type "free-protein and lipid-mobility paradigm" was resolved by recommending an additional emphasis on the mosaicism of the membrane besides receptor mobility.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
analysis
Antibodies
Antigens
Antigen
blood
Monoclonal
chemistry
Diffusion
Dyes
Energy Transfer
Flow Cytometry
Fluorescence
Fluorescent Dyes
HLA Antigens
Human
Hungary
Immunoglobulins
Fab
Immunohistochemistry
immunology
Intercellular Adhesion Molecule-1
Interleukin-2
Lymphocytes
Macromolecular Systems
Major Histocompatibility Complex
Membrane Fluidity
methods
Microscopy
Atomic Force
Microspheres
Modelsl
Motion
Receptor-CD3 Complex
T-Cell
Receptors
Cell Surface
Support
Non-U.S.Gov't
Tumor Cells
Cultured
Megjelenés:Cytometry. - 33 : 2 (1998), p. 225-233. -
További szerzők:Matkó János (1952-) (biológus) Mátyus László (1956-) (biofizikus) Szabó Gábor (1953-) (biofizikus) Szöllősi János (1953-) (biofizikus) Pieri, J. C. Farkas Tamás (1971-) (biológus) Gáspár Rezső (1944-) (biofizikus)
Internet cím:DOI
elektronikus változat
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3.

001-es BibID:BIBFORM114595
035-os BibID:(scopus)85169450797 (WOS)001058799600001
Első szerző:Kormos József (fizikus)
Cím:HLA DQ protein changes the cell surface distribution pattern of HLA proteins as monitored by Förster resonance energy transfer and high-resolution electron microscopy / Kormos József, Veres Adrienn J., Imre László, Mátyus László, Benkő Szilvia, Szöllősi János, Jenei Attila
Dátum:2023
ISSN:1552-4922 1552-4930
Megjegyzések:Peptide presentation by MHC class I and MHC class II molecules plays important roles in the regulation of the immune response. One factor in these displays is the density of antigen, which must exceed a critical threshold for the effective activation of T cells. Nonrandom distribution of MHC class I and class II has already been detected at the nanometer level and at higher hierarchical levels. It is not clear how the absence and reappearance of some protein molecules can influence the nonrandom distribution. Therefore, we performed experiments on HLA II-deficient bare lymphocyte syndrome (BLS1) cells: we created a stable transfected cell line, tDQ6-BLS-1, and were able to detect the effect of the appearance of HLA-DQ6 molecules on the homo and heteroassociation of different cell surface molecules by comparing Förster resonance energy transfer (FRET) efficiency on transfected cells to that on nontransfected BLS-1 and JY human B-cell lines. Our FRET results show a decrease in homoassociation FRET between HLA I chains in HLA-DQ6-transfected tDQ6-BLS-1 cells compared with the parent BLS-1 cell line and an increase in heteroassociation FRET between HLA I and HLA II (compared with JY cells), suggesting a similar pattern of antigen presentation by the HLA-DQ6 allele. Transmission electron microscopy (TEM) revealed that both HLA class I and class II molecules formed clusters at higher hierarchical levels on the tDQ6-BLS-1 cells, and the de novo synthesized HLA DQ molecules did not intersperse with HLA class I islands. These observations could be important in understanding the fine tuning of the immune response.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
BLS-1
FRET
HLA-DQ6
immunogold labeling
MHC
TEM
Megjelenés:Cytometry Part A. - 103 : 12 (2023), p. 978-991. -
További szerzők:Veres Adrienn J. (biofizikus) Imre László (1979-) (biológus) Mátyus László (1956-) (biofizikus) Benkő Szilvia (1973-) (molekuláris biológus) Szöllősi János (1953-) (biofizikus) Jenei Attila (1966-) (biofizikus)
Internet cím:Szerző által megadott URL
DOI
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4.

001-es BibID:BIBFORM004566
Első szerző:Kovács Tamás (szülész-nőgyógyász, humángenetikus)
Cím:DNA flow cytometry of human spermatozoa : consistent stoichiometric staining of sperm DNA using a novel decondensation protocol / Kovács T., Békési G., Fábián A., Rákosy Z., Horváth G., Mátyus L., Balázs M., Jenei A.
Dátum:2008
Megjegyzések:Rapid flow cytometric measurement of the frequency of aneuploid human sperms is in increasing demand but development of an exploitable method is hindered by difficulties of stoichiometric staining of sperm DNA. An aggressive decondensation protocol is needed after which cell integrity still remains intact. We used flow cytometry to examine the effect of lithium diiodosalicylate (LIS, chaotropic agent) on fluorescence intensity of propidium iodide-treated human spermatozoa from 10 normozoospermic men. When flow cytometric identification of diploid spermatozoa was achieved, validation was performed after sorting by three-color FISH. In contrast with the extremely variable histograms of nondecondensed sperms, consistent identification of haploid and diploid spermatozoa was possible if samples were decondensed with LIS prior to flow cytometry. A 76-fold enrichment of diploid sperms was observed in the sorted fractions by FISH. A significant correlation was found between the proportion of sorted cells and of diploid sperms by FISH. Application of LIS during the preparation of sperm for flow cytometry appears to ensure the stoichiometric staining of sperm DNA, making quantification of aneuploid sperm percentage possible. To our knowledge this is the first report in terms of separating spermatozoa with confirmedly abnormal chromosomal content. High correlation between the proportion of cells identified as having double DNA content by flow cytometry and diploid sperm by FISH allows rapid calculation of diploidy rate. Copyright 2008 International Society for Advancement of Cytometry.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
diploid spermatozoa
aneuploid spermatozoa
propidium iodide
lithium diiodosalicylate
egyetemen (Magyarországon) készült közlemény
Megjelenés:Cytometry. Part A 73 : 10 (2008), p. 965-970. -
További szerzők:Békési Gyöngyi Fábián Ákos István (1982-) (aneszteziológus) Rákosy Zsuzsa (1978-) (sejtbiológus, molekuláris biológus, genetikus) Horváth Gábor (1974-) (biofizikus) Mátyus László (1956-) (biofizikus) Balázs Margit (1952-) (sejtbiológus, molekuláris genetikus) Jenei Attila (1966-) (biofizikus)
Internet cím:elektronikus változat
DOI
elektronikus változat
Borító:

5.

001-es BibID:BIBFORM076128
035-os BibID:(Wos)000450299400006 (Scopus)85055751019
Első szerző:Nizsalóczki Enikő
Cím:Minimum degree of overlap between IL-9R and IL-2R on human T lymphoma cells : a quantitative CLSM and FRET analysis / Nizsalóczki Enikő, Nagy Péter, Mocsár Gábor, Szabó Ágnes, Csomós István, Waldmann Thomas A., Vámosi György, Mátyus László, Bodnár Andrea
Dátum:2018
ISSN:1552-4922 1552-4930
Megjegyzések:The heterodimeric receptor complex of IL-9 consists of the cytokine-speci?c ?-subunit and the common ? -chain shared with other cytokines, including IL-2, a central regulator of T cell function. We have shown previously the bipartite spatial relationship of IL-9 and IL-2 receptors at the surface of human T lymphoma cells: in addition to common clusters, expression of the two receptor kinds could also be observed in segregated membrane areas. Here we analyzed further the mutual cell surface organization of IL-9 and IL-2 receptors. Complementing Pearson correlation data with co-occurrence analysis of confocal microscopic images revealed that a minimum degree of IL-9R/IL-2R co-localization exists at the cell surface regardless of the overall spatial correlation of the two receptor kinds. Moreover, our FRET experiments demonstrated molecular scale assemblies of the elements of the IL-9/IL-2R system. Binding of IL-9 altered the structure and/or composition of these clusters. It is hypothesized, that by sequestering receptor subunits in common membrane areas, the overlapping domains of IL-9R and IL-2R provide a platform enabling both the formation of the appropriate receptor complex as well as subunit sharing between related cytokines.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
IL-9 and -2 receptors
uorescence resonance energy transfer
Manders coef-cient
co-occurrence analysis
Pearson correlation analysis
confocal microscopy
human T lymphoma cells
co-localization of membrane proteins
Megjelenés:Cytometry Part A. - 93 : 11 (2018), p. 1106-1117. -
További szerzők:Nagy Péter (1971-) (biofizikus) Mocsár Gábor (1981-) (biofizikus) Nagyné Szabó Ágnes Timea (1982-) (vegyész) Csomós István (1983-) (molekuláris biológus) Waldmann, Thomas A. Vámosi György (1967-) (biofizikus) Mátyus László (1956-) (biofizikus) Dóczy-Bodnár Andrea (1970-) (biofizikus)
Pályázati támogatás:EFOP-3.6.3-VEKOP-16-2017-00009
EFOP
GINOP-2.3.2-15-2016-00026
GINOP
GINOP-2.3.3-15-2016-00003
GINOP
K120302
OTKA
Intramural research program of the National Cancer Institute, NIH
Egyéb
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
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6.

001-es BibID:BIBFORM006004
035-os BibID:(scopus)0021296515 (wos)A1984SD26500012
Első szerző:Szabó Gábor (biofizikus)
Cím:A follow-up study of the development of Rauscher erythroleukemia / Gábor Szabó, László Mátyus
Dátum:1984
Megjegyzések:Expression of cell membrane antigens recognized by antiserum raised against purified Friend murine leukemia virus (Fr-MuLV) envelope glycoprotein (gp71) and by xenotropic MuLV-coded cell surface antigen (XenCSA) specific antibodies was studied in the course of the development of Rauscher erythroleukemia in the spleen of Balb/c mice. DNA content vs immunofluorescence or light scattering of cells were simultaneously analyzed. At early stages of the disease (4-5 days after infection) the gp71 and XenCSA-related antigen expression is enhanced mainly on S-G2/M-phase cells as compared to the majority of G1-phase cells or to the endogenous background of uninfected cells. Later (around 10 days after infection) an approximately ten-fold increased gp71-related antigen density is reached in every phase of the cell cycle. These data show that the virus-induced transition from resting to proliferating state is coupled to enhanced expression of both helper and defective viral env-gene products in the cell membrane of mitotic and G1-phase cells as well.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
analysis
Animal
Antibodies
Antigens,Surface
Cell Cycle
Cell Membrane
Comparative Study
Dna
DNA,Neoplasm
etiology
Flow Cytometry
Follow-Up Studies
immunology
Leukemia,Erythroblastic,Acute
Light
Mice
Rauscher Virus
Spleen
Support,Non-U.S.Gov't
Tumor Virus Infections
Megjelenés:Cytometry. - 5 : 1 (1984), p. 92-95. -
További szerzők:Mátyus László (1956-) (biofizikus)
Internet cím:DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

7.

001-es BibID:BIBFORM004886
Első szerző:Szentesi Gergely (kémia-fizika tanár)
Cím:Computer program for analyzing donor photobleaching FRET image series / Szentesi, G., Vereb, G., Horvath, G., Bodnar, A., Fabian, A., Matko, J., Gaspar, R., Damjanovich, S., Matyus, L., Jenei, A.
Dátum:2005
ISSN:1552-4922
Megjegyzések:The photobleaching fluorescence resonance energy transfer (pbFRET) technique is a spectroscopic method to measure proximity relations between fluorescently labeled macromolecules using digital imaging microscopy. To calculate the energy transfer values one has to determine the bleaching time constants in pixel-by-pixel fashion from the image series recorded on the donor-only and donor and acceptor double-labeled samples. Because of the large number of pixels and the time-consuming calculations, this procedure should be assisted by powerful image data processing software. There is no commercially available software that is able to fulfill these requirements. METHODS: New evaluation software was developed to analyze pbFRET data for Windows platform in National Instrument LabVIEW 6.1. This development environment contains a mathematical virtual instrument package, in which the Levenberg-Marquardt routine is also included. As a reference experiment, FRET efficiency between the two chains (beta2-microglobulin and heavy chain) of major histocompatibility complex (MHC) class I glycoproteins and FRET between MHC I and MHC II molecules were determined in the plasma membrane of JY, human B lymphoma cells. RESULTS: The bleaching time constants calculated on pixel-by-pixel basis can be displayed as a color-coded map or as a histogram from raw image format. CONCLUSION: In this report we introduce a new version of pbFRET analysis and data processing software that is able to generate a full analysis pattern of donor photobleaching image series under various conditions.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Algorithms
analysis
beta 2-Microglobulin
Biophysics
Cell Line,Tumor
Cells
Energy Transfer
Fluorescence
Fluorescence Resonance Energy Transfer
Glycoproteins
Histocompatibility Antigens
Human
Humans
Hungary
Lymphoma
Major Histocompatibility Complex
metabolism
methods
Microscopy
Photobleaching
Research
Software
Support
egyetemen (Magyarországon) készült közlemény
Megjelenés:Cytometry. Part A. - 67 : 2 (2005), p. 119-128. -
További szerzők:Vereb György (1965-) (biofizikus, orvos) Horváth Gábor (1974-) (biofizikus) Dóczy-Bodnár Andrea (1970-) (biofizikus) Fábián Ákos István (1982-) (aneszteziológus) Matkó János (1952-) (biológus) Gáspár Rezső (1944-) (biofizikus) Damjanovich Sándor (1936-2017) (biofizikus) Mátyus László (1956-) (biofizikus) Jenei Attila (1966-) (biofizikus)
Internet cím:elektronikus változat
DOI
Borító:

8.

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:

9.

001-es BibID:BIBFORM004639
035-os BibID:(scopus)0032529665 (wos)000075434200001
Első szerző:Szöllősi János (biofizikus)
Cím:Application of fluorescence resonance energy transfer in the clinical laboratory : routine and research / Szollosi J., Damjanovich S., Matyus L.
Dátum:1998
ISSN:196-4763
Megjegyzések:Fluorescence resonance energy transfer (FRET) phenomenon has been applied to a variety of scientific challenges in the past. The potential utility of this biophysical tool will be revisited in the 21st century. The rapid digital signal processing in conjunction with personal computers and the wide use of multicolor laser technology in clinical flow cytometry opened an opportunity for multiplexed assay systems. The concept is very simple. Color-coded microspheres are used as solid-phase matrix for the detection of fluorescent labeled molecules. It is the homogeneous assay methodology in which solid-phase particles behave similarly to the dynamics of a liquid environment. This approach offers a rapid cost-effective technology that harnesses a wide variety of fluorochromes and lasers. With this microsphere technology, the potential applications for clinical flow cytometry in the future are enormous. This new approach of well-established clinically proven methods sets the stage to briefly review the theoretical and practical aspects of FRET technology. The review shows various applications of FRET in research and clinical laboratories. Combination of FRET with monoclonal antibodies resulted in a boom of structural analysis of proteins in solutions and also in biological membranes. Cell surface mapping of cluster of differentiation molecules on immunocompetent cells has gained more and more interest in the last decade. Several examples for biological applications are discussed in detail. FRET can also be used to improve the spectral characteristics of fluorescent dyes and dye combinations, such as the tandem dyes in flow and image cytometry and the FRET primers in DNA sequencing and polymerase chain reactions. The advantages and disadvantages of donor-acceptor dye combinations are evaluated. In addition, the sensitivity of FRET provides the basis for establishing fast, robust, and accurate enzyme assays and immunoassays. Benefits and limitations of FRET-based assays are thoroughly scrutinized. At the end of the paper we review the future of FRET methodology.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
analysis
Antibodies
Biophysics
Computers
Diagnostic Tests
Routine
Dna
Dyes
Energy Transfer
Flow Cytometry
Fluorescence
Fluorescent Dyes
Human
Hungary
Image Cytometry
Lasers
methods
Microspheres
Proteins
Research
Spectrometry
Support
Non-U.S.Gov't
Megjelenés:Cytometry. - 34 : 4 (1998), p. 159-179. -
További szerzők:Damjanovich Sándor (1936-2017) (biofizikus) Mátyus László (1956-) (biofizikus)
Internet cím:Intézményi repozitóriumban (DEA) tárolt változa
DOI
Borító:

10.

001-es BibID:BIBFORM006077
Első szerző:Vereb György (biofizikus, orvos)
Cím:Depletion of intracellular calcium stores facilitates the influx of extracellular calcium in platelet derived growth factor stimulated A172 glioblastoma cells / Vereb, G., Jr., Szollosi, J., Matyus, L., Balazs, M., Hyun, W. C., Feuerstein, B. G.
Dátum:1996
Megjegyzések:Calcium signaling in non-excitable cells is the consequence of calcium release from intracellular stores, at times followed by entry of extracellular calcium through the plasma membrane. To study whether entry of calcium depends upon the level of saturation of intracellular stores, we measured calcium channel opening in the plasma membrane of single confluent A172 glioblastoma cells stimulated with platelet derived growth factor (PDGF) and/or bradykinin (BK). We monitored the entry of extracellular calcium by measuring manganese quenching of Indo-1 fluorescence. PDGF raised intracellular calcium concentration ([Ca2+]i) after a dose-dependent delay (tdel) and then opened calcium channels after a dose-independent delay (tch). At higher doses (> 3 nM), BK increased [Ca2+]i after a tdel approximately 0 s, and tch decreased inversely with both dose and peak [Ca2+]i. Experiments with thapsigargin (TG), BK, and PDGF indicated that BK and PDGF share intracellular Ca2+ pools that are sensitive to TG. When these stores were depleted by treatment with BK and intracellular BAPTA, tdel did not change, but tch fell to almost 0 s in PDGF stimulated cells, indicating that depletion of calcium stores affects calcium channel opening in the plasma membrane. Our data support the capacitative model for calcium channel opening and the steady-state model describing quantal Ca2+ release from intracellular stores.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
antagonists and inhibitors
Biophysics
Bradykinin
Ca(2+)-Transporting ATPase
Calcium
Calcium Channel Blockers
Calcium Channels
Calcium Signaling
Dose-Response Relationship,Drug
drug effects
Fluorescence
Glioblastoma
Human
Hungary
Lanthanum
Manganese
metabolism
Neuroglia
pharmacology
Platelet-Derived Growth Factor
Signal Transduction
Support, Non-U.S. Gov't
Support, U.S.Gov't, Non-P.H.S.
Support, U.S.Gov't, P.H.S.
Terpenes
Thapsigargin
Tumor Cells,Cultured
Megjelenés:Cytometry. - 24 : 1 (1996), p. 64-73. -
További szerzők:Szöllősi János (1953-) (biofizikus) Mátyus László (1956-) (biofizikus) Balázs Margit (1952-) (sejtbiológus, molekuláris genetikus) Hyun, William C. Feuerstein, Burt G.
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