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001-es BibID:BIBFORM040778
Első szerző:Batta József Tamás (fül-orr-gégész)
Cím:Active and passive behaviour in the regulation of stiffness of the lateral wall in outer hair cells of the guinea-pig / Batta, T. J., Panyi, G., Gaspar, R., Sziklai, I.
Megjegyzések:The stiffness of the outer hair cell (OHC) lateral wall, measured by the micropipette aspiration technique, is non-linear, decreasing from the ciliary pole (stiffness parameter Sp 1.83+/-0.13 nN/microm n=10) towards the cell base (Sp 1.14+/-0.16 nN/microm, n=10) irrespective of the cochleoapical or cochleobasal origin of the cells. The length of the aspirated lateral wall segment was related exponentially to the duration of the applied negative pressure (6 cm H2O) in the synaptic region of the OHCs whereas an active, sigmoid component was observed between 30 and 60 s in the supranuclear regions. A significant increase of the midlateral wall stiffness (to 1.91+/-0.23 nN/microm; n=10) was observed in calcium-free medium and the sigmoid component of the response of the lateral wall was abolished. Salicylate (5 mM) had no significant effect on the active sigmoid behaviour of the lateral wall (n=10). Gadolinium (5 mM), a non-specific cation channel blocker, increased the stiffness of the lateral wall and attenuated the active component (n=10). The motor protein prestin thus does not seem to be involved in the active stiffness regulation seen in this study. A role for the cortical cytoskeleton in the regulation of stiffness seems reasonable according to our model. The mechanism may involve calcium-dependent metabolic modification of cytoskeletal or membrane proteins.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Pflugers Archiv. - 447 : 3 (2003), p. 328-336. -
További szerzők:Panyi György (1966-) (biofizikus) Gáspár Rezső (1944-) (biofizikus) Sziklai István (1954-) (fül-orr-gégész)
Internet cím:Szerző által megadott URL
Intézményi repozitóriumban (DEA) tárolt változat


001-es BibID:BIBFORM005104
Első szerző:Szűcs Attila (fül-orr-gégész)
Cím:Differential expression of potassium currents in Deiters cells of the guinea pig cochlea / Attila Szűcs, Sándor Somodi, Tamás J. Batta, Andrea Tóth, Gyula P. Szigeti, László Csernoch, György Panyi, István Sziklai
Megjegyzések:Among the supporting cells, Deiters cells are in intimate contact with outer hair cells (OHCs) in the inner ear. The aim of this study was to characterize the outward rectifying K+ current of Deiters cells in conjunction with cellular morphological characteristics. In the majority of cells, the K+ current had a biphasic inactivation kinetics (tau1 and tau2 were 2,735+/-90 (n=77) and 160+/-14 ms (n=72), respectively). The rapidly inactivating current component was more sensitive to Charybdotoxin (ChTx, 10 nM) block whereas the slowly inactivating current could be blocked more efficiently by tetraethylammonium (1 mM). All these point toward the existence of two distinct potassium channel types in these cells. Deiters cells attached to shorter OHCs had more voluminous, whereas those attached to longer OHCs had lanky cell bodies. The inactivation kinetics was slower in cells having corpulent cell bodies due to the increased proportion of the slowly inactivating current component (0.736+/-0.033, n=27) as compared to the one determined for lanky cells (0.522+/-0.023, n=36). The average peak K+ current was higher in Deiters cells connected to OHCs (5,417+/-541 pA, n=40) than in isolated ones (3,527+/-410, n=37). Deiters cells having different cell shapes and showing different K+ channel expression may contribute to the active mechanism of the cochlea to various degrees.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Guinea Pigs
Organ of Corti
Patch-Clamp Techniques
Potassium Channel Blockers
Potassium Channels
Megjelenés:Pflügers Archiv. - 452 : 3 (2006), p. 332-341. -
További szerzők:Somodi Sándor (1977-) (belgyógyász) Batta József Tamás (1970-) (fül-orr-gégész) Tóth Andrea (1973-) (fül-orr-gégész) Szigeti Gyula (1969-) (élettanász, elektrofiziológus) Csernoch László (1961-) (élettanász) Panyi György (1966-) (biofizikus) Sziklai István (1954-) (fül-orr-gégész)
Internet cím:DOI
elektronikus változat
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