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1.

001-es BibID:BIBFORM004842
Első szerző:Panyi György (biofizikus)
Cím:Ion channels and lymphocyte activation / Panyi, G., Varga, Z., Gaspar, R.
Dátum:2004
Megjegyzések:The ion channels expressed by T lymphocytes play key roles in the control of the membrane potential and calcium signaling, thereby affecting signal transduction pathways that lead to the activation of these cells following antigenic stimulation. Disruption of these pathways can attenuate or prevent the response of T-cells to antigenic challenge resulting in immune suppression. Studies using ion channel blockers of high affinity and specificity have shown that this interference can be achieved at the level of ion channels. Suppression of immune functions by channel blockers has been demonstrated in vitro and in vivo. New information about the molecular structure of ion channels facilitates the design of more potent and more specific inhibitors. Thus, T-cell ion channels are likely to serve as targets for immunomodulatory drugs in the near future. Here, the biophysical properties, tissue distribution, regulation of expression, molecular pharmacology and role in T-cell activation of the voltage-gated Kv1.3 and the Ca(2+)-activated IKCa1 potassium channels and those of the Ca(+) release-activated Ca(2+) (CRAC) channel are reviewed.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Animals
Biophysics
Calcium
Calcium Channel Blockers
Calcium Channels
Calcium Signaling
Cells
Humans
Hungary
immunology
In Vitro
Ion Channels
Lymphocyte Activation
Lymphocytes
Membrane Potentials
Molecular Structure
pharmacology
physiology
Potassium
Potassium Channel Blockers
Potassium Channels
Research
Signal Transduction
Support
T-Lymphocytes
Tissue Distribution
Megjelenés:Immunology Letters. - 92 : 1-2 (2004), p. 55-66. -
További szerzők:Varga Zoltán (1969-) (biofizikus, szakfordító) Gáspár Rezső (1944-) (biofizikus)
Internet cím:elektronikus változat
DOI
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2.

001-es BibID:BIBFORM062512
Első szerző:Pethő Zoltán (orvos)
Cím:The anti-proliferative effect of cation channel blockers in T lymphocytes depends on the strength of mitogenic stimulation / Zoltan Petho, Andras Balajthy, Adam Bartok, Krisztian Bene, Sandor Somodi, Orsolya Szilagyi, Eva Rajnavolgyi, Gyorgy Panyi, Zoltan Varga
Dátum:2016
ISSN:0165-2478
Megjegyzések:Ion channels are crucially important for the activation and proliferation of T lymphocytes, and thus, for the function of the immune system. Previous studies on the effects of channel blockers on T cell proliferation reported variable effectiveness due to differing experimental systems. Therefore our aim was to investigate how the strength of the mitogenic stimulation influences the efficiency of cation channel blockers in inhibiting activation, cytokine secretion and proliferation of T cells under standardized conditions. Human peripheral blood lymphocytes were activated via monoclonal antibodies targeting the TCR-CD3 complex and the co-stimulator CD28. We applied the blockers of Kv1.3 (Anuroctoxin), KCa3.1 (TRAM-34) and CRAC (2-Apb) channels of T cells either alone or in combination with rapamycin, the inhibitor of the mammalian target of rapamycin (mTOR). Five days after the stimulation ELISA and flow cytometric measurements were performed to determine IL-10 and IFN-? secretion, cellular viability and proliferation. Our results showed that ion channel blockers and rapamycin inhibit IL-10 and IFN-? secretion and cell division in a dose-dependent manner. Simultaneous application of the blockers for each channel along with rapamycin was the most effective, indicating synergy among the various activation pathways. Upon increasing the extent of mitogenic stimulation the anti-proliferative effect of the ion channel blockers diminished. This phenomenon may be important in understanding the fine-tuning of T cell activation.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Immune regulation
Rapamycin
ion channel
Cytokine secretion
T cells
Megjelenés:Immunology Letters 171 (2016), p. 60-69. -
További szerzők:Balajthy András (1988-) (általános orvos) Bartók Ádám (1984-) (biotechnológus) Bene Krisztián (1986-) (Biológus) Somodi Sándor (1977-) (belgyógyász) Szilágyi Orsolya (1985-) (molekuláris biológus, biokémikus) Rajnavölgyi Éva (1950-) (immunológus) Panyi György (1966-) (biofizikus) Varga Zoltán (1969-) (biofizikus, szakfordító)
Pályázati támogatás:KTIA NAP 13-2-2015-0009
Egyéb
Internet cím:Szerző által megadott URL
DOI
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3.

001-es BibID:BIBFORM005107
Első szerző:Vámosi György (biofizikus)
Cím:The role of supramolecular protein complexes and membrane potential in transmembrane signaling processes of lymphocytes / Vamosi, G., Bodnar, A., Damjanovich, S., Nagy, P., Varga, Z., Damjanovich, L.
Dátum:2006
ISSN:165-2478 (Print)
Megjegyzések:The formation of protein patterns in lymphocyte plasma membranes is analyzed in the light of past and, also, very recent experiments. The analysis surveys the lateral organization of major histocompatibility complex glycoproteins, intercellular adhesion molecule-1, interleukin-2 and -15 receptors, Kv1.3 K+ ion channels and the T-cell receptor as well as their behavior under different conditions. These molecules form small- and large-scale clusters in the membrane of human lymphocytes. Many of the association motifs occur in other investigated cell types. The conclusions point toward a possible role for ion channel activities, membrane potential changes and alterations of the lateral organization of proteins in transmembrane signaling and cytotoxic interactions. In our outlook new factors that potentially affect membrane protein cluster formation and interactions are discussed. A role for MHC glycoproteins in concentrating membrane proteins and organizing protein patterns is suggested, and the possibility that the membrane potential may modulate protein conformation and, thereby, affect protein-protein interactions is pointed out. A well-defined role for the presence of ion channels in the immune synapse is offered, which could explain the significance of ion channel accumulation in the immune synapse together with the T-cell receptor.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
analysis
Animals
Biophysics
Cell Membrane
Glycoproteins
Human
Humans
Hungary
immunology
Intercellular Adhesion Molecule-1
Interleukin-2
Ion Channels
Light
Lymphocytes
Major Histocompatibility Complex
Membrane Potentials
Membrane Proteins
metabolism
Multiprotein Complexes
physiology
Protein Conformation
Proteins
Research
Signal Transduction
Support
T-Lymphocytes
Megjelenés:Immunology Letters. - 104 : 1-2 (2006), p. 53-58. -
További szerzők:Dóczy-Bodnár Andrea (1970-) (biofizikus) Damjanovich Sándor (1936-2017) (biofizikus) Nagy Péter (1971-) (biofizikus) Varga Zoltán (1969-) (biofizikus, szakfordító) Damjanovich László (1960-) (általános sebész)
Internet cím:DOI
elektronikus változat
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4.

001-es BibID:BIBFORM037603
Első szerző:Varga Zoltán (biofizikus, szakfordító)
Cím:Potassium channel expression in human CD4(+) regulatory and naive T cells from healthy subjects and multiple sclerosis patients / Zoltan Varga, Tunde Csepany, Ferenc Papp, Akos Fabian, Peter Gogolak, Agnes Toth, Gyorgy Panyi
Dátum:2009
ISSN:0165-2478
Megjegyzések:The membrane potential of human T cells is regulated by two potassium channels: the voltage-gatedKV1.3 and the Ca2+-activated KCa3.1. These two channels are essential for efficient antigenic activation andproliferation of T cells and are expressedat different levels in naïve, centralmemory and effectormemory Tcells. This provides the opportunity to inhibit the proliferation of the targeted subtype by channel-specificblocking compounds. Regulatory T cells (Tregs) also represent a unique subtype of T cells that performhighly specialized tasks in controlling immune responses, which raises the possibility that they too havea distinctive channel expression pattern. Using whole-cell patch-clamp we tested this hypothesis anddetermined the ion channel expression of CD4+CD25hiCD127lo regulatory and CD4+CD25loCD127hi naïveT cells from the peripheral blood of healthy volunteers and multiple sclerosis (MS) patients sorted by flowcytometry. We have found that naïve and Treg cells from healthy controls expressed equal numbers ofKV1.3 channels, while Tregs had a greater membrane surface as assessed by capacitance measurements,and consequentially lower channel density than naïve cells, indicating an "incomplete activation state"of Tregs. In contrast, Tregs from MS patients had fewer KV1.3 channels than naïve cells and there wasno difference in the membrane capacitance or channel density between the two subtypes of cells. Theexpression level of KCa3.1 channels was similar in all cell subsets. The observed differences in KV1.3channel expression density may contribute to the varying responses upon antigenic stimulation by thesecell types in health and disease.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Regulatory T cell
Potassium channel
Multiple sclerosis
Cell capacitance
Channel density
egyetemen (Magyarországon) készült közlemény
Megjelenés:Immunology Letters 124 : 2 (2009), p. 95-101. -
További szerzők:Csépány Tünde (1956-) (neurológus, pszichiáter) Papp Ferenc (1979-) (biofizikus) Fábián Ákos István (1982-) (aneszteziológus) Gogolák Péter (1968-) (biológus, immunológus) Tóth Ágnes (1983-) (biofizikus) Panyi György (1966-) (biofizikus)
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
Szerző által megadott URL
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5.

001-es BibID:BIBFORM014028
Első szerző:Varga Zoltán (biofizikus, szakfordító)
Cím:Ion channels in T lymphocytes : an update on facts, mechanisms and therapeutic targeting in autoimmune diseases / Varga Zoltan, Hajdu Peter, Panyi Gyorgy
Dátum:2010
ISSN:0165-2478
Megjegyzések:During the last quarter of a century a large body of evidence was gathered about the involvement ofion channels in T lymphocyte activation. A series of remarkable findings promoted T cell ion channelsto become potential pharmaceutical targets in the therapy of autoimmune disorders. Numerous comprehensivereviews describe the types of ion channels found in the plasma membrane of T cells andtheir roles in signaling pathways leading to activation, the changes in the expression of these channelsbrought upon by differentiation to various T cell subsets, the formation and possible functions of signalingmolecular clusters that include ion channels in the immunological synapse, the discovery and refinementof structurally different ion channel blockers and the successful in vivo application of such compoundsto suppress hypersensitivity reactions and autoimmune processes. In this review we wish to provide aconcise update on these topics from recent years, highlighting the most notable developments.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
T lymphocyte
potassium channel
autoimmune disease
Megjelenés:Immunology Letters. - 130 : 1-2 (2010), p. 19-25. -
További szerzők:Hajdu Péter (1975-) (biofizikus) Panyi György (1966-) (biofizikus)
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DOI
Intézményi repozitóriumban (DEA) tárolt változat
elektronikus változat
Borító:
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