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1.

001-es BibID:BIBFORM102342
Első szerző:Fazekas Zoltán
Cím:Double-sided fluorescence energy transfer : a new method for the in situ examination of the associations of erbb receptors on the surface of tumor cells / Fazekas Z., Petrás M., Vereb G., Szöllősi J.
Dátum:2004
ISSN:0196-4763
Tárgyszavak:Orvostudományok Elméleti orvostudományok idézhető absztrakt
folyóiratcikk
Megjelenés:Cytometry. - 59A : 1 (2004), p. 86. -
További szerzők:Petrás Miklós (1977-) (orvos) Vereb György (1965-) (absztraktok, könyvfejezetek) Szöllősi János (1953-) (biofizikus)
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2.

001-es BibID:BIBFORM042481
035-os BibID:(scopus)40049093067 (wos)000253576200006
Első szerző:Fazekas Zsolt (biofizikus)
Cím:Two-sided fluorescence resonance energy transfer for assessing molecular interactions of up to three distinct species in confocal microscopy / Zsolt Fazekas, Miklós Petrás, Ákos Fábián, Zsuzsanna Pályi-Krekk, Péter Nagy, Sándor Damjanovich, György Vereb, János Szöllősi
Dátum:2008
ISSN:1552-4922 1552-4930
Megjegyzések:The role of the expression patterns of proteins involved in oncogenesis can be understood after characterizing their multimolecular interactions. Conventional FRET methods permit the analysis of interaction between two molecular species at the most, which necessitates the introduction of new approaches for studying multicomponent signaling complexes. Flow cytometric as well as microscopic donor (dbFRET) and acceptor (abFRET) photobleaching FRET measurements were performed to determine the association states of ErbB2, b1-integrin, and CD44 receptors. Based on consecutively applied abFRET and dbFRET methods (two-sided FRET), the relationship of b1-integrin?ErbB2 heteroassociation to ErbB2 homoassociation and of b1-integrin?ErbB2 heteroassociation to ErbB2?CD44 heteroassociation was studied by correlating pixel-by-pixel FRET values of the corresponding abFRET and dbFRET images in contour plots. Anticorrelation was observed between b1-integrin?ErbB2 heteroassociation and ErbB2 homoassociation on trastuzumab sensitive N87 and SK-BR-3 cells, while modest positive correlation was found between b1-integrin?ErbB2 and ErbB2?CD44 heteroassociationon trastuzumab resistant MKN-7 cells. The FRET efficiency values of b1-integrin?ErbB2 heteroassociation were markedly higher at the focal adhesion regions on attachedcells than those measured by flow cytometry on detached cells. In conclusion, we implemented an experimental set-up termed two-sided FRET for correlating two pairwiseinteractions of three arbitrarily chosen molecular species. On the basis of our results, we assume that the homoassociation state of ErbB2 is dynamically modulated by its interaction with b1-integrins.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
beta1-integrin
abFRET
analysis
Biophysics
Carcinoma
CD44
Cell Adhesion
Cell Adhesion Molecules
Cell Line
Cells
Cholera Toxin
Confocal
Confocal microscopy
cytology
dbFRET
Energy Transfer
ErbB2
Flow Cytometry
Fluorescein
Fluorescence
fluorescence microscopy
Fluorescence Resonance Energy Transfer
FRET
Hiv-1
Human
Hungary
Image Cytometry
Image Processing
Kinetics
Laser scanning confocal microscopy
Luminescence
methods
Microscopy
Photobleaching
Protein-protein interactions
Proteins
Receptor tyrosine kinase
Research
Signal Transduction
Software
therapy
Trastuzumab resistance
tsFRET
Tyrosine
egyetemen (Magyarországon) készült közlemény
Megjelenés:Cytometry Part A. - 73 : 3 (2008), p. 209-219. -
További szerzők:Petrás Miklós (1977-) (orvos) Fábián Ákos István (1982-) (aneszteziológus) Pályiné Krekk Zsuzsanna (1974-) (molekuláris biológus) Nagy Péter (1971-) (biofizikus) Damjanovich Sándor (1936-2017) (biofizikus) Vereb György (1965-) (biofizikus, orvos) Szöllősi János (1953-) (biofizikus)
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3.

001-es BibID:BIBFORM042654
035-os BibID:(scopus)19444380683 (wos)000229353200007
Első szerző:Horváth Gábor (biofizikus)
Cím:Selecting the right fluorophores and flow cytometer for fluorescence resonance energy transfer measurements / Gábor Horváth, Miklós Petrás, Gergely Szentesi, Ákos Fábián, John W. Park, György Vereb, János Szöllősi
Dátum:2005
ISSN:1552-4922 1552-4930
Megjegyzések:BACKGROUND:Fluorescence resonance energy transfer applied in flow cytometry (FCET) is an excellent tool for determining supramolecular organization of biomolecules at the cell surface or inside the cell. Availability of new fluorophores and cytometers requires the establishment of fluorophore dye pairs most suitable for FCET measurements.METHODS:A gastric tumor cell line (N87) was labeled for major histocompatibility complex class I heavy chain and beta2-microglobulin with antibodies conjugated with fluorescein- and indocarbocyanine-like fluorophores and analyzed in FCET measurements on a cell-by-cell basis using three flow cytometers: FACSCalibur, FACSDiVa, and FACSArray.RESULTS:Normalized fluorescence intensity values were measured and normalized energy transfer efficiencies, spectral overlap integrals, and crucial dye- and instrument-dependent parameters were calculated for all matching pairs of seven fluorophores on the three commercial cytometers. The most crucial parameter in determining the applicability of the donor-acceptor pairs was the normalized fluorescence intensity and the least important one was the spectral overlap.CONCLUSIONS:On the basis of available laser lines, the optimal dye pair for all three cytometers is the Alexa546-Alexa647 pair, which produces high energy transfer efficiency values and has the best spectral characteristics with regard to laser excitation, detection of emission, and spectral overlap.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
fluorescence resonance energy transfer
flow cytometry
donor-acceptor pair
egyetemen (magyarországon) készült közlemény
Megjelenés:Cytometry. Part A. - 65A : 2 (2005), p. 148-157. -
További szerzők:Petrás Miklós (1977-) (orvos) Szentesi Gergely (1976-) (kémia-fizika tanár) Fábián Ákos István (1982-) (aneszteziológus) Park, John W. Vereb György (1965-) (biofizikus, orvos) Szöllősi János (1953-) (biofizikus)
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4.

001-es BibID:BIBFORM042484
035-os BibID:(scopus)23844475901 (wos)000231845600013
Első szerző:Mocanu, Maria-Magdalena
Cím:Associations of ErbB2, beta1-integrin and lipid rafts on Herceptin (Trastuzumab) resistant and sensitive tumor cell lines / Maria-Magdalena Mocanu, Zsolt Fazekas, Miklós Petrás, Péter Nagy, Zsolt Sebestyén, Jorma Isola, József Tímár, John W. Park, György Vereb, János Szöllősi
Dátum:2005
ISSN:0304-3835
Megjegyzések:ErbB2-mediated transmembrane signaling is a key target of novel anticancer agents such as Herceptin. Our comparison of Herceptin resistant (JIMT-1, MKN-7) and sensitive (SKBR-3, N-87) cell lines demonstrates the importance of ErbB2 association patterns involving integrins and lipid rafts. Flow cytometric FRET and confocal microscopic measurements revealed colocalization and molecular proximity between b1-integrins and ErbB2, as well as their association with lipid rafts. A weak functional interaction between ErbB2 and b1-integrin and the fact that ErbB2 did not co-patch with b1-integrins uponcrosslinking imply that ErbB2 and b1-integrin define two distinct molecular association clusters from a functional point of view. Although Herceptin-sensitive cell lines expressed more ErbB2 and fewer b1-integrin molecules on their surface than their resistant counterparts, this finding probably does not explain the Herceptin resistant phenotype due to the weak interaction between b1-integrins and ErbB2. Our results imply that the true significance of the expression profile of proteins involved inoncogenesis can only be understood after characterizing their molecular interactions.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Antibodies
Antibodies,Monoclonal
Antigens,CD29
Biophysics
Breast Neoplasms
Cell Line
Cell Membrane
Drug Resistance,Neoplasm
Humans
Hungary
Membrane Microdomains
metabolism
pathology
pharmacology
Phenotype
physiology
Proteins
Receptor,erbB-2
Research
Support
Tumor Cells,Cultured
egyetemen (Magyarországon) készült közlemény
Megjelenés:Cancer Letters. - 227 : 2 (2005), p. 201-212. -
További szerzők:Fazekas Zsolt (1971-) (biofizikus) Petrás Miklós (1977-) (orvos) Nagy Péter (1971-) (biofizikus) Sebestyén Zsolt Isola, Jorma Timár József Park, John W. Vereb György (1965-) (biofizikus, orvos) Szöllősi János (1953-) (biofizikus)
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5.

001-es BibID:BIBFORM050093
Első szerző:Petrás Miklós (orvos)
Cím:Molecular interactions of ErbB1 (EGFR) and integrin-β1 in astrocytoma frozen sections predict clinical outcome and correlate with Akt-mediated in vitro radioresistance / Miklós Petrás, Tamás Lajtos, Elza Friedländer, Álmos Klekner, Éva Pintye, Burt G. Feuerstein, János Szöllősi, György Vereb
Dátum:2013
ISSN:1522-8517
Megjegyzések:INTRODUCTION: Treatment of astrocytoma is frequently hampered by radioresistance of the tumor. In addition to overexpression of ErbB1/EGFR, functional crosstalk between receptor tyrosine kinases and cell adhesion molecules may also contribute to therapy resistance. METHODS: Acceptor photobleaching FRET was implemented on frozen sections of clinical astrocytoma to check the role of ErbB1-integrin-beta1 interaction. U251 glioma subclones were obtained by introducing extra CHR7 material or the ErbB1 gene to test the relevance and mechanism of this interaction in vitro. RESULTS: Grade IV tumors showed higher ErbB1 and integrin-beta1 expression and greater ErbB1-integrin-beta1 heteroassociation than did grade II tumors. Of these, the extent of molecular association was a single determinant of tumor grade and prognosis in stepwise logistic regression. In vitro, integrin-beta1 was upregulated, and radiosensitivity was diminished by ectopic ErbB1 expression. Great excess of ErbB1 provided colony forming advantage over medium excess but did not yield better radiation resistance or faster proliferation and decreased to medium level over time, whereas integrin-beta1 levels remained elevated and defined the extent of radioresistance. Increased expression of ErbB1 and integrin-beta1 was paralleled by decreasing ErbB1 homoassociation and increasing ErbB1-integrin-beta1 heteroassociation. Microscopic two-sided FRET revealed that pixels with higher ErbB1-integrin-beta1 heteroassociation exhibited lowed ErbB1 homoassociation, indicating competition for association partners among these molecules. Boosted Akt phosphorylation response to EGF accompanied this shift toward heteroassociation, and the consequentially increased radioresistance could be reverted by inhibiting PI3K. CONCLUSION: The clinically relevant ErbB1-integrin-beta1 heteroassociation may be used as a target of both predictive diagnostics and molecular therapy
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Biophysics
Cell Adhesion
Cell Adhesion Molecules
cell biology
EGFR
ErbB1
EXPRESSION FRET
Glioma
Hungary
In Vitro
methods
molecular interaction
Phosphorylation
Photobleaching
Receptor
tyrosine kinase
Research
therapy
TUMORS
Tyrosine
Molekulatudomány
Doktori iskola
Megjelenés:Neuro-Oncology. - 15 : 8 (2013), p. 1027-1040. -
További szerzők:Lajtos Tamás Friedländer Elza (1980-) (biofizikus) Klekner Álmos (1970-) (idegsebész) Pintye Éva (1955-) (fizikus) Feuerstein, Burt G. Szöllősi János (1953-) (biofizikus) Vereb György (1965-) (biofizikus, orvos)
Pályázati támogatás:K75752
OTKA
NK101337
OTKA
F-049050
OTKA
ETT 523/2003
Egyéb
ETT 362-01/2009
Egyéb
TÁMOP-4.2.1/B-09/1/KONV-2010-0007
TÁMOP
TÁMOP-4.2.2/B-10/1-2010-0024
TÁMOP
TÁMOP-4.2.2/A-11/1/KONV-2012-0025
TÁMOP
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6.

001-es BibID:BIBFORM042489
Első szerző:Petrás Miklós (orvos)
Cím:Significance of Epidermal Growth Factor Receptor in the Radiation Resistance of Glioblastoma Tumors / Miklós Petrás, Tamás Lajtos, Éva Pintye, Burt G. Feuerstein, János Szöllősi, György Vereb
Dátum:2008
Megjegyzések:In the United States, a dramatically increased incidence and mortality of brain tumors have been observed over the past decades. Of the ~44 thousand new cases of primary malignant and benign brain tumors diagnosed per year, highgrade astrocytomas or multiform glioblastomas show particularly bad prognosis in spite of therapeutic developments. Current management of multiform glioblastoma includes the most extensive surgical resection possible, followed by adjuvant radio- and chemotherapy. However, treatment is frequently hampered by decreased radiosensitivity of the tumor. Recent studies revealed that subpopulations of glioblastoma cells show amplified checkpoint activation of the cell cycle upon ionizing radiation, which induces overactivation of DNA repair processes and leads to maintained proliferation rate as well as clinically observed radioresistance and recurrence of the tumor over time. In addition, overexpression of some transmembrane receptors has also been implicated in radioresistance. However, the role of the overexpressed proteins can only be interpreted reliably if their multi-faceted molecular interactions are properly characterized. Thus, based on recent evidence for the functional crosstalk between certain cell adhesion molecules andreceptor tyrosine kinases, we have examined the molecular interactions of the receptor tyrosine kinase EGFR and the cell adhesion molecule 1-integrin using flow cytometric and microscopic fluorescence resosnance energy transfer (FRET)measurements on two cellular model systems showing similar expression patterns to low and high grade astrocytomas. On the one hand, U251 glioblastoma clones established by introducing varying amounts of extra chromosome 7 into the cells, and on the other hand stable, high and low EGFR expressing transfenctant U251 NCI sublines were investigated. The results revealed that increased EGFR and 1-integrin expression levels correlate with stronger EGFR ? 1-integrin heteroassociation, while concurrently the EGFR homoassociation is decreased, suggesting that 1-integrins may dynamically modulate the homoassociation state of EGFR receptors. This functional relationship may play an important role in decreasing radiosensitivity and tumor progression, especially since the EGFR ? 1-integrin molecular interaction appears to promote radioresistance via the Akt pathway.
ISBN:978-0-7354-0611-7
Tárgyszavak:Orvostudományok Elméleti orvostudományok könyvfejezet
Megjelenés:Radiation Damage In Biomolecular Systems : Proceedings of the 5th International Conference (RADAM 2008) / ed. by Károly Tőkési, Béla Sulik. - p. 204-217. -
További szerzők:Lajtos Tamás Pintye Éva (1955-) (fizikus) Feuerstein, Burt G. Szöllősi János (1953-) (biofizikus) Vereb György (1965-) (biofizikus, orvos)
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7.

001-es BibID:BIBFORM042485
Első szerző:Petrás Miklós (orvos)
Cím:Különböző eredetű malignus agydaganatok invazivitásának panelszerű vizsgálata / Petrás Miklós, Hutóczki Gábor, Varga Imre, Vereb György, Szöllősi János, Bognár László, Ruszthi Péter, Kenyeres Annamária, Tóth Judit, Hanzély Zoltán, Scholtz Beáta, Klekner Álmos
Dátum:2009
ISSN:0025-0244 2060-0399
Megjegyzések:Tumor cell invasion into the surrounding brain tissue is mainly responsible for the failure of radical surgical resection and successful treatment, with tumor recurrence as microdisseminated disease. Epidermal growth factor receptors (EGFRs), integrins and their ligands in the extracellular matrix (ECM)predominantly participate in the invasion process, including the cell adhesion to the surrounding microenvironment and cell migration. The extent of infi ltration of the surrounding brain tissue by malignant tumors strongly depends on the tumor cell type. Malignant gliomas show much more intensive peritumoral invasion than do metastatic tumors. In this study, the mRNA expression of 29 invasionrelated molecules (18 cell membrane receptors or receptor subunits (EGFRs and integrins) and 11 ECM components: collagens, laminins and fi bronectin) was investigated by quantitative reverse transcriptase polymerase chain reaction. Fresh frozen human tissue samples from glioblastoma (GBM) and intracerebral bronchial adenocarcinoma metastases (five pieces from each) were evaluated. Significant differenceswere established in six of the 29 molecules (ErbB1, 2, 3, integrins alpha3, 7 and beta1). To confirm ourresults at the protein level, immunohistochemical analysis of nine molecules was performed. The staining intensity differed definitely in the case of ErbB1, 2 and integrins alpha3 and beta1. Determining the differences in invasion-related molecules in tumors of different origin can help identify the exact molecular mechanisms that facilitate peritumoral infiltration by glioblastoma cells. These results should allow the selection of target molecules for potential chemotherapeutic agents directed against highly invasive malignant gliomas.
Tárgyszavak:Orvostudományok Elméleti orvostudományok magyar nyelvű folyóiratközlemény hazai lapban
EGFR
Glioblastoma
Integrins
Invasion
Metastasis
Biophysics
Hungary
egyetemen (Magyarországon) készült közlemény
Megjelenés:Magyar Onkológia. - 53 : 3 (2009), p. 253-258. -
További szerzők:Hutóczki Gábor (1983-) (Ph.D. hallgató) Varga Imre (1960-) (tüdőgyógyász) Vereb György (1965-) (biofizikus, orvos) Szöllősi János (1953-) (biofizikus) Bognár László (1958-) (idegsebész, gyermekidegsebész) Ruszthi Péter (1975-) (idegsebész szakorvos) Kenyeres Annamária (1980-) (analitikus) Tóth Judit (1958-) (onkológus szakorvos) Hanzély Zoltán Scholtz Beáta (1967-) (biokémikus, molekuláris biológus) Klekner Álmos (1970-) (idegsebész)
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8.

001-es BibID:BIBFORM102341
Első szerző:Tufeanu, Maria Magdalena
Cím:Association of erbb2, [beta]1 integrin and lipid rafts on tumor cells / Tufeanu M. M., Fazekas Z., Petrás M., Isola J., Vereb G., Szöllősi J.
Dátum:2004
ISSN:0196-4763
Tárgyszavak:Orvostudományok Elméleti orvostudományok idézhető absztrakt
folyóiratcikk
Megjelenés:Cytometry. - 59A : 1 (2004), p. 79. -
További szerzők:Fazekas Zsolt (1971-) (biofizikus) Petrás Miklós (1977-) (orvos) Isola, Jorma Vereb György (1965-) (absztraktok, könyvfejezetek) Szöllősi János (1953-) (biofizikus)
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9.

001-es BibID:BIBFORM102343
Első szerző:Zsebik Barbara (biofizikus)
Cím:ErbB2 homodimerization and activation in Herceptin resistant and sensitive cell lines / Zsebik B., Petrás M., Isola J., Szöllősi J., Vereb G.
Dátum:2004
ISSN:0196-4763
Tárgyszavak:Orvostudományok Elméleti orvostudományok idézhető absztrakt
folyóiratcikk
Megjelenés:Cytometry. - 59A : 1 (2004), p. 113. -
További szerzők:Petrás Miklós (1977-) (orvos) Isola, Jorma Szöllősi János (1953-) (biofizikus) Vereb György (1965-) (absztraktok, könyvfejezetek)
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