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1.

001-es BibID:BIBFORM001219
035-os BibID:(Wos)000237853100005 (Scopus)33744794924
Első szerző:Bánfalvi Gáspár (sejtbiológus, gyógyszerész)
Cím:Common pathway of chromosome condensation in mammalian cells / Gaspar Banfalvi, Gabor Nagy, Mariann Gacsi, Tamas Roszer, Alexei G. Basnakian
Dátum:2006
Megjegyzések:During evolution ribose was selected as the exclusive sugar component of nucleic acids. The selection is explained by using molecular models and by eliminating most of the other common sugars by looking at their chemical structure and envisioning how they would fit in a nucleic acid model. Comparisons of sugar pucker conformations and configurations of pentoses indicate that ribose was not randomly selected but the only choice, since beta-D-ribose fits best into the structure of physiological forms of nucleic acids. In other nucleotides containing arabinose, xylose, or lyxose, the C(2)'-OH and/or the C(3)'-OH are above the furanose ring, causing steric interference with the bulky base and the C(5)'-OH group.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
kromatin szerkezet
Megjelenés:DNA and Cell Biology. - 25 : 5 (2006), p. 295-301. -
További szerzők:Szemán-Nagy Gábor (1975-) (biológia tanár-molekuláris biológus) Gácsi Mariann Röszer Tamás (1979-) (orvos, biológus) Basnakian, Alexei G.
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2.

001-es BibID:BIBFORM103106
035-os BibID:(WOS)000228340800003 (Scopus)19544370693
Első szerző:Röszer Tamás (orvos, biológus)
Cím:Seasonal periodicity of enteric nitric oxide synthesis and its regulation in the snail, Helix lucorum / Tamás Röszer, Éva Kiss-Tóth, A. József Szentmiklósi, Gáspár Bánfalvi
Dátum:2005
ISSN:1077-8306
Megjegyzések:The snail Helix lucorum has been used as a model to study the adaptation of a nitric oxide (NO)-forming enteric neural network to the long-term resting period of summer estivation or winter hibernation. Quantification of the NO-derived nitrite established that NO formation is confined to the nitric oxide synthase (NOS)-containing myenteric network of the mid-intestine. In active snails but not in resting snails, NO production could be enhanced by the NOS substrate l-arginine (l-ARG, 1?mM). We followed the enteric NO synthesis in a snail population kept at natural conditions for 1 year. Our findings indicate that NO synthesis was depressed in July during entry to the estivation, had a peak in autumn before hibernation, and finally was reduced during hibernation. Monoamines (histamine, serotonin, and adrenalin) could inhibit the NO liberation in active snails. Cofactors of NOS (?-NADPH, ?-NAD, FAD, FMN, Ca2+, TH4) did not alter the low nitrite production in hibernating snails. We conclude that enteric NO synthesis in H. lucorum has a regular seasonal periodicity following the annual physiological cycles of terrestrial snails. During estivation or hibernation, NOS activity is blocked. Monoamines, the levels of which are elevated during hibernation, can trigger decreased NOS activity. The reduced activity of NOS cannot be restored by the administration of NOS cofactors; therefore, their absence cannot be the cause of the temporarily blocked L-ARG/NO conversion ability of NOS.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
NADPH diaphorase
nitric oxide synthase
enteric nervous system
Helix lucorum
Megjelenés:Invertebrate Biology. - 124 : 1 (2005), p. 18-24. -
További szerzők:Kiss-Tóth Éva (1983-) (biológus) Szentmiklósi József András (1948-) (farmakológus, klinikai laboratóriumi szakorvos) Bánfalvi Gáspár (1943-) (sejtbiológus, gyógyszerész)
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DOI
Intézményi repozitóriumban (DEA) tárolt változat
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3.

001-es BibID:BIBFORM044696
035-os BibID:(WoS)000302851500024 (Scopus)84858337745
Első szerző:Röszer Tamás (orvos, biológus)
Cím:FMRFamide-related peptides : Anti-opiate transmitters acting in apoptosis / Tamás Rőszer, Gáspár Bánfalvi
Dátum:2012
ISSN:0196-9781
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
ASIC
Cell death
GPR10
GPR54
Kisspeptins
NPFF-receptor
Opiates
Opioid receptors
RF-amides
Megjelenés:Peptides. - 34 : 1 (2012), p. 177-185. -
További szerzők:Bánfalvi Gáspár (1943-) (sejtbiológus, gyógyszerész)
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
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4.

001-es BibID:BIBFORM012888
035-os BibID:(Wos)000284665200006 (Scopus)78649333360
Első szerző:Röszer Tamás (orvos, biológus)
Cím:Hypothermia translocates nitric oxide synthase from cytosol to membrane in snail neurons / Tamás Rőszer, Éva Kiss-Tóth, Dávid Rózsa, Tamás Józsa, A. József Szentmiklósi, Gáspár Bánfalvi
Dátum:2010
Megjegyzések:Neuronal nitric oxide (NO) levels are modulated through the control of catalytic activity of NO synthase (NOS). Although signals limiting excess NO synthesis are being extensively studied in the vertebrate nervous system, our knowledge is rather limited on the control of NOS in neurons of invertebrates. We have previously reported a transient inactivation of NOS in hibernating snails. In the present study, we aimed to understand the mechanism leading to blocked NO production during hypothermic periods of Helix pomatia. We have found that hypothermic challenge translocated NOS from the cytosol to the perinuclear endoplasmic reticulum, and that this cytosol to membrane trafficking was essential for inhibition of NO synthesis. Cold stress also downregulated NOS mRNA levels in snail neurons, although the amount of NOS protein remained unaffected in response to hypothermia. Our studies with cultured neurons and glia cells revealed that glia-neuron signaling may inhibit membrane binding and inactivation of NOS. We provide evidence that hypothermia keeps NO synthesis "hibernated" through subcellular redistribution of NOS.
Tárgyszavak:Orvostudományok Gyógyszerészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
nitric oxide synthase
Megjelenés:Cell and Tissue Research. - 342 : 2 (2010), p. 191-203. -
További szerzők:Kiss-Tóth Éva (1983-) (biológus) Rózsa Dávid (1982-) (Ph.D hallgató) Józsa Tamás (1969-) (gyermeksebész, urológus) Szentmiklósi József András (1948-) (farmakológus, klinikai laboratóriumi szakorvos) Bánfalvi Gáspár (1943-) (sejtbiológus, gyógyszerész)
Internet cím:DOI
Intézményi repozitóriumban (DEA) tárolt változat
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5.

001-es BibID:BIBFORM008293
035-os BibID:(Wos)000265622700014 (Scopus)67349249432
Első szerző:Röszer Tamás (orvos, biológus)
Cím:Acetylcholine inhibits nitric oxide (NO) synthesis in the gastropod nervous system / Tamás Rőszer, Tamás Józsa, A. József Szentmiklósi, Gáspár Bánfalvi
Dátum:2009
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Cell and Tissue Research. - 336 : 2 (2009), p. 325-335. -
További szerzők:Józsa Tamás (1969-) (gyermeksebész, urológus) Szentmiklósi József András (1948-) (farmakológus, klinikai laboratóriumi szakorvos) Bánfalvi Gáspár (1943-) (sejtbiológus, gyógyszerész)
Internet cím:elektronikus változat
DOI
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6.

001-es BibID:BIBFORM001297
035-os BibID:(Wos)000222590300004 (Scopus)2442668507
Első szerző:Röszer Tamás (orvos, biológus)
Cím:Structural diversity of NADPH diaphorase-reactive enteral networks in Stylommatophora (Gastropoda, Pulmonata) / Tamás Röszer, Zsolt Jenei, Zoltán Serfözö, Zsolt Czimmerer, Gáspár Bánfalvi
Dátum:2004
Megjegyzések:In this work we investigated the involvement of putative nitric oxide (NO)-forming neurons in enteric plexuses of stylommatophoran gastropods. The nitric oxide synthase (NOS)-containing cells were detected by NADPH diaphorase (NADPHd) histochemistry in the entreral nervous systems of several stylommatophoran species (Achatinacea: Achatina fulica, Helicacea: Cepaea hortensis, Cepaea nemoralis, Discus rotundatus, Helicella obvia, Helix lucorum, Helix lutescens, Monachoides umbrosa, Trichia hispida, Zebrina detrita, Succineacea: Succinea putris, Vertiliginacea: Clausilia dubia, Zonitacea: Arion ater, Arion subfuscus, Limax maximus). We detected the NO synthesis of isolated midintestinal segments by Griess's quantification of nitrite, one end product of NO. Effects of the NOS substrate L-arginine and the NOS inhibitor N?-nitro-L-arginine (NOARG) were also tested on nitrite production. We found NADPHd-reactive neurons and extrinsic nerves with NADPHd-stained fibers within the myenteric and submucosal networks of the midintestine of investigated members of Helicacea, Succineacea, and Vertiliginacea families. These networks innervated the midintestinal musculature and several nerve cells of the myenteric and submucosal plexi. In investigated members of Achatinacea and Zonitacea, NADPHd-stained networks were not detectable within the digestive tract. Administration of 1 mM L-arginine elevated, whereas 2 mM of NOARG diminished, the nitrite levels of the NADPHd-stained networks containing midintestine in C. nemoralis and H. lucorum. Enteral NADPHd staining was not detected in A. ater and L. maximus, and the nitrite production was not affected by L-arginine. Our results indicate a possible, but evolutionarily not conserved, NO-mediated enteral transmission in stylommatophoran gastropods.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
NADPH diaforáz
nitrogénmonoxid szintáz
enterális idegrendszer
lábasfejűek
Megjelenés:Invertebrate Biology. - 123 : 2 (2004), p. 128-135. -
További szerzők:Jenei Zsolt Serfőző Zoltán Czimmerer Zsolt (1981-) (molekuláris biológus) Bánfalvi Gáspár (1943-) (sejtbiológus, gyógyszerész)
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7.

001-es BibID:BIBFORM001290
035-os BibID:(Wos)000187210800003 (Scopus)0348010590
Első szerző:Röszer Tamás (orvos, biológus)
Cím:A possible stimulatory effect of FMRFamide on neural nitric oxide production in the central nervous system of Helix lucorum L. / Tamás Röszer, Zsolt Jenei, Tamás Gáll, Olivér Nagy, Zsolt Czimmerer, Zoltán Serfözö, Károly Elekes, Gáspár Bánfalvi
Dátum:2004
Megjegyzések:The anatomical and functional relationship between neurons expressing nitric oxide (NO) synthase and molluscan cardioexcitatory (FMRFamide)-like neuropeptides was studied in the central ganglia of Helix lucorum (Pulmonata, Gastropoda), applying NADPHdiaphorase (NADPHd) histochemistry to visualize NO synthase and immunocytochemistry to demonstrate FMRFamide (FMRFa) at the light microscopic level. The NO production of the ganglia was detected by the colorimetric Griess determination of nitrite, a breakdown product of NO. Effects of the NO synthase substrate amino acid L-arginine, the NO synthase inhibitor Nomega-nitro-L-arginine (NOARG), synthetic FMRFa and the FMRFa sensitive ion channel blocker amiloride hydrochloride on nitrite production were also tested. NADPHd reaction labeled nerve cells and fibers in the procerebra, mesocerebra and metacerebra within the cerebral ganglia, and cell clusters in the postcerebral ganglia. FMRFa immunolabeling could be observed within subpopulations of NADPHd positive cells and in pericellular varicose fibers surrounding NADPHd stained neurons. Nitrite production of the ganglia was stimulated by L-arginine (10- 20 mM) but was decreased by NOARG (1-2 mM). Synthetic FMRFa (0.830-3.340 mM) increased the nitrite production in a dose dependent manner, but was ineffective in the presence of NOARG. Amiloride hydrochloride (7.890 mM) reduced the FMRFa evoked nitrite production in all ganglia. This is the first description of an anatomical relationship between putative NO producing and FMRFa containing cells, suggesting a possible regulatory role of FMRFa in the NO mediated signaling in an invertebrate nervous system. Copyright 2004 S. Karger AG, Basel
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
FMRFamid
nitrogén monoxid
neurokémia
gerinctelenek
fejlábúak
éticsiga
Megjelenés:Brain, Behavior and Evolution. - 63 : 1 (2004), p.23-33. -
További szerzők:Jenei Zsolt Gáll Tamás Nagy Olivér Czimmerer Zsolt (1981-) (molekuláris biológus) Serfőző Zoltán Elekes Károly Bánfalvi Gáspár (1943-) (sejtbiológus, gyógyszerész)
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8.

001-es BibID:BIBFORM003340
035-os BibID:(Wos)000220863100011 (Scopus)2442660388
Első szerző:Röszer Tamás (orvos, biológus)
Cím:Nitric oxide synthesis is blocked in the enteral nervous system during dormant periods of the snail Helix lucorum L. / Tamás Rőszer, Zsolt Czimmerer, A. József Szentmiklósi, Gáspár Bánfalvi
Dátum:2004
ISSN:0302-766X
Megjegyzések:During dormancy of terrestrial snails, the whole neuromodulation of the nervous system is deeply modified. In this work we studied the adaptation of a previously described, putatively nitric oxide (NO) forming enteral network to the long-term resting periods of the snail Helix lucorum. The standard NADPH diaphorase (NADPHd) technique, which is an accepted method for histochemical NO synthase (NOS) detection, labeled the same enteric neurons of the midintestine in active or hibernated snails. Quantification of the NO-derived nitrite by the Griess reaction established that the nitrite formation is confined to the NADPHd-reactive network containing the midintestinal segment. In active snails, the nitrite formation could be enhanced by the NOS substrate l-arginine (10 mM?1 mM), but decreased by the known NOS inhibitors 1 mM Nw-nitro-l-arginine (NOARG) and 10 mM aminoguanidine (AG). Application of 1 mM larginine and 1 mM NOARG decreased the amplitude of the midintestinal muscle contractile activity, but did not affect the rectal motility. In dormancy, the nitrite formation was reduced in the NADPHd-reactive midintestinal network. Application of l-arginine could not provoke nitrite production and did not influence the midintestinal motility. Our findings indicate that NO is involved in the neural transmission to intestinal muscles of gastropods, but enteric release of NO is blocked during dormancy. The decreased NO synthesis is possibly due to an as yet undefined mechanism, by which the l-arginine/NO conversion ability of NOS could temporarily be inhibited in the long-term resting period of H. lucorum.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
NADPH diaphorase
nitric oxide synthase
hibernation
estivation
enteric nervous system
Helix lucorum L. (Mollusca)
Megjelenés:Cell and tissue research. - 316 (2004), p. 255-262. -
További szerzők:Czimmerer Zsolt (1981-) (molekuláris biológus) Szentmiklósi József András (1948-) (farmakológus, klinikai laboratóriumi szakorvos) Bánfalvi Gáspár (1943-) (sejtbiológus, gyógyszerész)
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9.

001-es BibID:BIBFORM001263
035-os BibID:(Wos)000239248000017 (Scopus)33746435763
Első szerző:Röszer Tamás (orvos, biológus)
Cím:Phe-met-arg-phe (FMRF)-amide is a substrate source of NO synthase in the gastropod nervous system / Tamás Rőszer, Éva Kiss-Tóth, Mihály Petkó, A. József Szentmiklósi, Gáspár Bánfalvi
Dátum:2006
Megjegyzések:The possible involvement of the L-arginine-containing Phe-met-arg-phe (FMRF)-amide (FMRFa) in neuronal nitric oxide (NO) biosynthesis was studied in a gastropod species. We found NADPH-diaphorase-positive neurons and FMRFa-containing fibers in close proximity in the enteric nervous system. Administration of L-arginine and FMRFa induced quantitatively similar nitrite production in both intact intestinal tissues and tissue homogenates. These changes could be prevented by the presence of NOARG (an NO synthase inhibitor). Neither chemically modified FMRFa (D-arginine instead of L-arginine) nor amino acid constituents of FMRFa (methionine, phenylalanine) affected basal nitrite production. FMRFa-induced alterations were reduced in the presence of Na+ channel blockers (tetrodotoxin, amiloride, lidocaine), the Na+/K+ATPase inhibitor ouabain, or protease inhibitors (leupeptine, pepstatine-a). FMRFa and its amino acid constituents were analyzed by paper chromatography. When FMRFa was added to tissue homogenates, the peptide was eliminated within 1-2 min, whereas methionine, phenylalanine, arginine, and citrulline levels were elevated simultaneously. We tested the effects of FMRFa, L-arginine, and NOARG on intestinal contractile activity. FMRFa relaxed the intestine for 1-2 min and then induced contractions for 20-40 min. In the presence of NOARG, no relaxant effect of FMRFa was recorded. As administration of L-arginine strongly inhibits the mechanical activity of the intestinal muscle, NO production presumably plays a substantial role in the action of FMRFa, at least in the initial phase. Our biochemical data indicate a direct involvement of FMRFa in NO biosynthesis. FMRFa might be hydrolyzed by extracellular peptidases and then the locally released arginine might be transported into the cells and broken-down to produce NO. Depolarization-induced NO production attributable to the activation of amiloride-sensitive Na+ channels might also be involved.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
neuropeptid NO szintáz szubsztrát
Megjelenés:Cell and Tissue Research. - 325 : 3 (2006), p. 567-575. -
További szerzők:Kiss-Tóth Éva (1983-) (biológus) Petkó Mihály (1943-) (orvos, neurobiológus) Szentmiklósi József András (1948-) (farmakológus, klinikai laboratóriumi szakorvos) Bánfalvi Gáspár (1943-) (sejtbiológus, gyógyszerész)
Internet cím:elektronikus változat
DOI
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10.

001-es BibID:BIBFORM001242
035-os BibID:(Wos)000235672300004 (Scopus)33344470488
Első szerző:Röszer Tamás (orvos, biológus)
Cím:The neuropeptide FMRFamide can protect cells against apoptosis in the snail digestive gland / T. Rőszer, J. Kappelmayer, G. G. Nagy, A. J. Szentmiklósi, A. G. Basnakian, G. Bánfalvi
Dátum:2006
Megjegyzések:FMRFamide-related peptides are widespread neurotransmitters or neurohormones regulating somatic or visceral motor activity. Some recent data indicate that these neuropeptides may be involved in the control of cell proliferation and apoptosis. In this work we investigated the possible effect of FMRFamide on cell viability in an invertebrate-type proliferating tissue. As a model, we used the midintestinal gland of the snail, Helix lucorum Linnaeus. Immunohistochemistry demonstrated the direct innervation of the gland cells by FMRFamide-containing nerve fibers. Midintestinal glands of snails were injected with 50 microM FMRFamide and the control with sterile deionised water or bovine serum albumin (BSA). Injections were administrated 4 times. Transmission electron microscopy, annexin V-labeling, thiazolyl blue (MTT) viability tests and ploidy analyses were carried out to define the viable/dead cell ratio in the tissue samples. FMRFamide increased the MTT-reduction of tissues, reduced the amount of apoptotic nuclei and annexin V-labeled cells. Deionised water or BSA injection induced cell death. Cell cycle analysis revealed that FMRFamide significantly elevated the amount of cells in G0/G1 phase, but did not induce mitosis. We conclude, that the FMRFamide can be a life-signal for cells, protect them from apoptosis without altering mitosis.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
antiapoptotikus neuropeptid
Megjelenés:Apoptosis. - 11 : 2 (2006), p. 173-182. -
További szerzők:Kappelmayer János (1960-) (laboratóriumi szakorvos) Szemán-Nagy Gábor (1975-) (biológia tanár-molekuláris biológus) Szentmiklósi József András (1948-) (farmakológus, klinikai laboratóriumi szakorvos) Basnakian, Alexei G. Bánfalvi Gáspár (1943-) (sejtbiológus, gyógyszerész)
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