CCL

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001-es BibID:BIBFORM038801
035-os BibID:PMID:15950414
Első szerző:Borkó Rezső
Cím:Slow motility, electromotility and lateral wall stiffness in the isolated outer hair cells / Rezső Borkó, Tamás József Batta, István Sziklai
Dátum:2005
ISSN:0378-5955
Megjegyzések:Slow motile length changes of isolated, apical turn outer hair cells (OHCs) (n=36) were induced by perfusion of saline (flow rate: 0.6 microl/min) as a mechanical challenge or by perfusion of 12.5 mM KCl solution for 90 s as a chemical and mechanical challenge with and without ocadaic acid (OA), a serine/threonine protein phosphatase inhibitor. Electromotility was evoked by square pulses from +/-35 mV to +/-240 mV during the slow shortening and recovery period (n=36). Stiffness of the lateral wall was measured by the micropipette aspiration technique (n=20). Saline perfusion caused a reversible shortening of 774+/-87 nm (n=9) as well as K+ of 1465+/-159 nm (n=9). Slow shortening increased lateral wall stiffness (1.25+/-0.02 to 1.52+/-0.03 nN/microm) (n=5-5). Simultaneously, electromotility magnitude decreased (n=9). Ocadaic acid blocked slow shortening, increased lateral wall stiffness, and decreased the magnitude of electromotility. Mechanical or mechanical+chemical stimulation of ocadaic acid treated OHCs do not further change stiffness or electromotility. Isolated OHCs respond with slow shortening and consutive cell stiffness increase to mechanical insult. This phenomenon seems operating with calcium-, and phosphorylation-dependent modifications of the cytoskeletal proteins. The subsequent electromotility gain decrease suggests a slow OHC shortening driven regulation of the cochlear amplifier with simultaneous safety control of the auditory periphery against overstimulation.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
egyetemen (Magyarországon) készült közlemény
Megjelenés:Hearing Research. - 207 : 1-2 (2005), p. 68-75. -
További szerzők:Batta József Tamás (1970-) (fül-orr-gégész) Sziklai István (1954-) (fül-orr-gégész)
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DOI
Intézményi repozitóriumban (DEA) tárolt változat
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2.

001-es BibID:BIBFORM018459
Első szerző:Pál Balázs (élettanász)
Cím:Voltage-gated and background K+ channel subunits expressed by the bushy cells of the rat cochlear nucleus / Pál B., Pór A., Pocsai K., Szücs G., Rusznák Z.
Dátum:2005
ISSN:0378-5955
Megjegyzések:Bushy cells of the ventral cochlear nucleus produce a single, short latency action potential at the beginning of long depolarisations. In the present work an immunochemical survey was performed to detect the presence of K+ channel subunits which may contribute to the specific membrane properties of the bushy cells. The immunocytochemical experiments conducted on enzymatically isolated bushy cells indicated positive immunolabelling for several subunits known to be responsible for the genesis of rapidly inactivating K+ currents. Bushy cells showed strong expression of Kv3.4, 4.2 and 4.3 subunits, with the lack of Kv1.4 specific immunoreaction. The Kv3.4-specific immunoreaction had a specific, patchy appearance. Bushy cells also expressed various members of the Kv1 subunit family, most notably Kv1.1, 1.2, 1.3 and 1.6. Weak positivity could be observed for Kv3.2 subunits. The positive immunolabelling for Kv3.4, Kv4.2 and Kv4.3 was confirmed in free-floating tissue slices. Voltage-clamp experiments performed on positively identified bushy cells in brain slices corroborated the presence and activity of Kv3.4 and Kv4.2/4.3 containing K+ channels. Bushy cell showed strong immunopositivity for TASK-1 channels too. The results presented in this work indicate that bushy cells possess several types of voltage-gated K+ channel subunits whose activity may contribute to the membrane properties and firing characteristics of these neurones.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Hearing Research. - 199 : 1-2 (2005), p. 57-70. -
További szerzők:Pór Ágnes Pocsai Krisztina (1978-) (élettanász) Szűcs Géza (1948-) (élettanász) Rusznák Zoltán (1965-) (élettanász)
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DOI
Intézményi repozitóriumban (DEA) tárolt változat
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3.

001-es BibID:BIBFORM009113
Első szerző:Pap Pál (élettanász)
Cím:Cytoplasmic Ca2+ concentration changes evoked by cholinergic stimulation in primary astrocyte cultures prepared from the rat cochlear nucleus / Pap, P., Kőszeghy, Á., Szücs, G., Rusznák, Z.
Dátum:2009
ISSN:0378-5955
Megjegyzések:The involvement of astrocytes in the cholinergic modulation of the cochlear nucleus has been studied using primary astrocyte cultures prepared from this nucleus. The cells were loaded with the membrane permeable form of the fluorescent Ca2+ indicator Fluo-4, and carbachol-induced Ca2+ concentration increases were monitored using an imaging system. In the presence of cholinergic stimulation 36.3% of the cells produced Ca2+ transients. The time course of the transients was variable; 45.0% of the responding cells showed only a rapid Ca2+ concentration increase, while in 50.5% of the astrocytes the fast component was followed by a slow plateau phase. Using muscarine as well as general and more specific cholinergic antagonists (atropine, pirenzepine, 4-DAMP and hexamethonium), the role of the M3 and (to a smaller extent) M1 muscarinic acetylcholine receptors could be demonstrated in the genesis of the carbachol-induced Ca2+ transients. The presence of these two subtypes of muscarinic receptors has been confirmed at both mRNA (Q-PCR) and protein (immunocytochemistry) levels. Our data demonstrate the responsiveness of the cochlear astrocytes towards cholinergic stimulation, suggesting that they may have roles in mediating the effects of cholinergic modulation in the rat cochlear nucleus.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Acetylcholine
antagonist
Astrocyte
Astrocytes
Atropine
Cholinergic Antagonists
Cochlear Nucleus
Fluo-4
glia
Hexamethonium
imaging
immunochemistry
Muscarine
Muscarinic receptors
Pirenzepine
Q-PCR
rat
receptor
Time
Megjelenés:Hearing Research. - 255 : 1-2 (2009), p. 73-83. -
További szerzők:Kőszeghy Áron (1983-) (Ph.D hallgató, élettanász) Szűcs Géza (1948-) (élettanász) Rusznák Zoltán (1965-) (élettanász)
Internet cím:elektronikus változat
elektronikus változat
DOI
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4.

001-es BibID:BIBFORM004847
Első szerző:Szűcs Attila (fül-orr-gégész)
Cím:Differential expression of purinergic receptor subtypes in the outer hair cells of the guinea pig / Attila Szücs, Henrietta Szappanos, Andrea Tóth, Zsolt Farkas, György Panyi, László Csernoch, István Sziklai
Dátum:2004
Megjegyzések:ATP acts as a neuro-modulator through purinoceptors in many different tissues. Many subtypes of these receptors have been identified in the inner ear, but so far only two types have been shown to be present in the membrane of the isolated outer hair cells (OHCs). The aim of this study was to detect and visualize the existence and distribution of purinoceptor subtypes as well as to study the [Ca(2+)](i) response of these cells in response to stimulation with ATP. Four P2X and three P2Y receptor subtypes were identified with different expression pattern in the membrane of guinea pig outer hair cells. Whereas intense labeling was observed for P2X1, P2X2, P2X4, P2Y1, P2Y2, and P2Y4, the labeling for the subtype P2X7 was weak. There was a marked difference in the distribution of the receptors along the surface of the cells with a homogenous distribution in cases of P2X1, P2X4, and P2Y1. In contrast, P2X2 and P2Y2 receptor density was high mainly at the apical, while P2X7 and P2Y4 at the basal pole of the cells. Similarly a heterogeneity was observed in the ATP-induced transient elevation in [Ca(2+)](i), which had either fast kinetics without desensitization or slow rise with desensitization.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Animals
Calcium
Cells
Female
Guinea Pigs
Hair Cells,Outer
Hungary
Immunohistochemistry
Kinetics
Male
metabolism
Microscopy, Fluorescence
Receptors, Purinergic P2
Research
Support
Tissue Distribution
Megjelenés:Hearing Research. - 196 : 1-2 (2004), p. 2-7. -
További szerzők:Szappanos Henrietta (1976-) (biológus, élettanász) Tóth Andrea (1973-) (fül-orr-gégész) Farkas Zsolt (1969-) (fül-orr-gégész) Panyi György (1966-) (biofizikus) Csernoch László (1961-) (élettanász) Sziklai István (1954-) (fül-orr-gégész)
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