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001-es BibID:BIBFORM004839
035-os BibID:(WOS)000220105600025 (scopus)1342345242
Első szerző:Nagy Henrietta
Cím:Distinct groups of multidrug resistance modulating agents are distinguished by competition of P-glycoprotein-specific antibodies / Nagy, H., Goda, K., Fenyvesi, F., Bacso, Z., Szilasi, M., Kappelmayer, J., Lustyik, G., Cianfriglia, M., Szabo, G.
Dátum:2004
Megjegyzések:P-glycoprotein (Pgp) is one of the ABC transporters responsible for the multidrug resistance of cancer cells. The conformational changes of Pgp that occur in the presence of substrates/modulators or ATP depletion are accompanied by the up-shift of UIC2 monoclonal antibody (mAb) binding. In the case of cyclosporin A, vinblastine or valinomycin, this up-shift was found to be concomitant with the near-complete suppression of labeling with other mAbs specific for Pgp epitopes overlapping with UIC2, while pre-treatment with verapamil or Tween 80 brings about a modest suppression. Here we have extended these observations to 44 Pgp interacting agents, and found that only 8 fall into the cyclosporin-like category, inducing a conformational state characterized by the complete UIC2 dominance. The rest of the drugs either did not affect antibody competition or had a modest effect. Thus, Pgp substrates/modulators can be classified into distinct modalities based on the conformational change they elicit.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Adenosine
Adenosine Triphosphatases
Animals
Anti-Bacterial Agents
Antibodies
Antibodies,Monoclonal
Antineoplastic Agents
Binding,Competitive
Biophysics
Calcium
Calcium Channel Blockers
Cells
Cyclosporine
Detergents
Drug Resistance,Multiple
Drug Resistance,Neoplasm
Epitopes
Flow Cytometry
Fluorescein
Fluoresceins
genetics
Humans
Hungary
immunology
Ivermectin
metabolism
Mice
Nih 3T3 Cells
P-Glycoprotein
pharmacology
physiology
Research
Substrate Specificity
Support
Valinomycin
Verapamil
Vinblastine
egyetemen (Magyarországon) készült közlemény
Megjelenés:Biochemical and Biophysical Research Communications. - 315 : 4 (2004), p. 942-949. -
További szerzők:Goda Katalin (1969-) (biofizikus) Fenyvesi Ferenc (1977-) (gyógyszerész, gyógyszertechnológus) Bacsó Zsolt (1963-) (biofizikus) Szilasi Mária (1953-) (tüdőgyógyász, klinikai immunológus, allergológus, belgyógyász) Kappelmayer János (1960-) (laboratóriumi szakorvos) Lustyik György Cianfriglia, Maurizio Szabó Gábor (1953-) (biofizikus)
Internet cím:elektronikus változat
DOI
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2.

001-es BibID:BIBFORM004883
035-os BibID:(WOS)000233027300007 (scopus)27644433274
Első szerző:Pataki Judit (biofizikus)
Cím:Biological microbeads for flow-cytometric immunoassays, enzyme titrations, and quantitative PCR / Pataki, J., Szabo, M., Lantos, E., Szekvolgyi, L., Molnar, M., Hegedus, E., Bacso, Z., Kappelmayer, J., Lustyik, G., Szabo, G.
Dátum:2005
ISSN:1552-4922
Megjegyzések:Introduction of microbeads into flow-cytometry has created a new scenario, making quantitative measurement of molecules dispersed in a homogeneous phase, with an extremely wide realm of already realized and potential applications possible. Development of this field has lead to specialized instrumentation and microbead arrays, dedicated to certain applications. METHODS: Formaldehyde-fixed yeast and bacterial cells were conjugated with avidin and applied as microbeads, to establish a simple, convenient, flexible, and inexpensive flow-cytometric platform for various immunological and biochemical assays. RESULTS: We have tested these "biological microbeads" for the simultaneous titration of human alpha-fetoprotein (AFP) and human Chorionic Gonadotropin (betahCG) hormone levels, for the titration of proteolytic and nucleolytic (restriction) enzymes, and for quantitative PCR, using biotinylated and fluorescent primers. CONCLUSIONS: The use of biological microbeads for various immunological and biochemical assays has been demonstrated. The flow-cytometric methods proved to be at least as sensitive as the standard biochemical or immunological tests. For proteinase K activity measurements, a single enzyme molecule in the sample could be detected. The sensitivity, versatility, and low cost of the assays may advance flow-cytometry to become a central methodological platform in most laboratories. The biological microbeads offer virtually unlimited possibilities for fluorescent labeling (addressing), conjugation of ligand binding molecules, and they are easy to handle and perform well in a multiplex format
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
alpha-Fetoproteins
analysis
Avidin
Biophysics
Biotinylation
Caseins
Cells
chemistry
Chorionic Gonadotropin,beta Subunit,Human
Dna
DNA Restriction Enzymes
Dyes
Endopeptidase K
Enzymes
Flow Cytometry
Fluorescent Dyes
Formaldehyde
Human
Humans
Hungary
Immunoassay
instrumentation
methods
Microspheres
Polymerase Chain Reaction
Research
Saccharomyces cerevisiae
Staphylococcus aureus
Streptavidin
Support
Titrimetry
egyetemen (Magyarországon) készült közlemény
Megjelenés:Cytometry. Part A. - 68 : 1 (2005), p. 45-52. -
További szerzők:Szabó Miklós (vegyészmérnök) Lantos Erika Székvölgyi Lóránt (1977-) (biofizikus, biokémikus, sejtbiológus) Molnár Mónika (biofizikus) Hegedűs Éva (1978-) (biofizikus) Bacsó Zsolt (1963-) (biofizikus) Kappelmayer János (1960-) (laboratóriumi szakorvos) Lustyik György Szabó Gábor (1953-) (biofizikus)
Internet cím:elektronikus változat
DOI
Borító:
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